Pub Date : 2024-10-09DOI: 10.1016/j.ortho.2024.100900
Sanjeev Verma, Vinay Kumar, Raj Kumar Verma, Chaman Lal, Naveen K. Subbaiah, Satinder Pal Singh
Patients seek orthodontic treatment to correct unesthetic and asymmetric smiles because even a minimal cant of 4 is well perceived by a layperson. This case report describes a nonsurgical orthodontic management of iatrogenic occlusal canting in a 22-year-old female, who developed it during a previous orthodontic treatment for an impacted canine. The iatrogenic cant was corrected by the intrusion of the left mandibular segment followed by extrusion of left maxillary segment using mini-implants. Mini-implants were inserted in the mandibular left buccal segment (the first between canine and premolar, the second between the second premolar and first permanent molar), and the intruded mandibular posteriors were stabilized with the help of stainless-steel ligature (0.012″ SS) tied to the mini-implant. The expected correction of the occlusal cant, asymmetric gingival and tooth exposure, and soft tissue lip cant were corrected resulting in a significant improvement in smile aesthetics at the end of orthodontic treatment. After a follow-up period of 24 months, the results were stable.
{"title":"Mini-implant assisted orthodontic correction of lip and occlusal cant of a young adult: A case report","authors":"Sanjeev Verma, Vinay Kumar, Raj Kumar Verma, Chaman Lal, Naveen K. Subbaiah, Satinder Pal Singh","doi":"10.1016/j.ortho.2024.100900","DOIUrl":"10.1016/j.ortho.2024.100900","url":null,"abstract":"<div><div>Patients seek orthodontic treatment to correct unesthetic and asymmetric smiles because even a minimal cant of 4 is well perceived by a layperson. This case report describes a nonsurgical orthodontic management of iatrogenic occlusal canting in a 22-year-old female, who developed it during a previous orthodontic treatment for an impacted canine. The iatrogenic cant was corrected by the intrusion of the left mandibular segment followed by extrusion of left maxillary segment using mini-implants. Mini-implants were inserted in the mandibular left buccal segment (the first between canine and premolar, the second between the second premolar and first permanent molar), and the intruded mandibular posteriors were stabilized with the help of stainless-steel ligature (0.012″ SS) tied to the mini-implant. The expected correction of the occlusal cant, asymmetric gingival and tooth exposure, and soft tissue lip cant were corrected resulting in a significant improvement in smile aesthetics at the end of orthodontic treatment. After a follow-up period of 24<!--> <!-->months, the results were stable.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100900"},"PeriodicalIF":1.8,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142394131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-07DOI: 10.1016/j.ortho.2024.100926
Katherine O’Friel , Andrew Chapple , Richard Ballard , Paul Armbruster
Objective
To evaluate the accuracy and precision of the AudaxCeph® fully automated software in identifying cephalometric landmarks on lateral cephalograms of Class II and Class III skeletal relationships, comparing its performance against experienced orthodontists using manual tracing within the same software environment.
Material and methods
Sixty cephalograms depicting severe Class II or Class III skeletal discrepancies were assessed by two board-certified orthodontists and AudaxCeph®’s artificial intelligence automatic tracing software. Among these, 40 cases were classified as Class II and 20 as Class III. An X–Y axis was established at the bottom left corner of each cephalogram, and subsequent X and Y coordinates for the landmarks were exported to Excel. Thirteen cephalometric landmarks were identified and used for comparing manual and automatic tracing methods, with no alteration of landmark positions post-tracing. Measures of the X coordinate, Y coordinate, and radial distance for each landmark were compared using t-tests for equivalence with a 2 mm margin, both against AudaxCeph®’s positions and intra-operator reliability.
Results
Analysis revealed that while most operator measurements closely approximated AudaxCeph® values, discrepancies exceeding 2 mm were notable at Gonion and Porion landmarks. Slight variability was noted in one instance during intra-examiner evaluation at the Gonion landmark.
Conclusions
This study concludes that AudaxCeph®’s artificial intelligence-driven automatic tracing of cephalograms offers a reliable and accurate method for orthodontic treatment planning across various skeletal types and severities. On average, it exhibits minimal discrepancies exceeding 2 mm compared to manual operators, with notable variations observed primarily at the Gonion and Porion landmarks. While AudaxCeph® is an acceptable tool for cephalometric landmark location, it's accuracy still require the practitioner to verify some less reliable landmark locations.
目的评估 AudaxCeph® 全自动软件在识别 II 类和 III 类骨骼关系的侧位头影图上的头影地标时的准确性和精确性，并将其性能与在相同软件环境中使用手动描记的经验丰富的正畸医师进行比较：由两名获得认证的正畸医师和 AudaxCeph® 人工智能自动描记软件对 60 张描述严重 II 类或 III 类骨骼差异的头颅侧位图进行评估。其中，40 个病例被归类为 II 类，20 个病例被归类为 III 类。在每张头型图的左下角建立了一个 X-Y 轴，随后将地标的 X 和 Y 坐标导出到 Excel 中。确定了 13 个头测地标，用于比较手动和自动描记方法，描记后不改变地标位置。使用 t 检验比较了每个地标的 X 坐标、Y 坐标和径向距离的测量值（差值为 2 毫米）与 AudaxCeph® 的位置和操作员内部可靠性的等效性：分析表明，虽然大多数操作员的测量值都非常接近 AudaxCeph® 的值，但在 Gonion 和 Porion 地标的测量中，差异明显超过 2 毫米。在 Gonion 地标的检查员内部评估中，有一次发现了轻微的差异：本研究得出结论，AudaxCeph® 的人工智能驱动的自动描记头相图为各种骨骼类型和严重程度的正畸治疗规划提供了一种可靠而准确的方法。平均而言，与人工操作员相比，它表现出的差异最小超过 2 毫米，主要在 Gonion 和 Porion 地标处观察到显著差异。虽然 AudaxCeph® 是一种可接受的头颅测量地标定位工具，但它的准确性仍然要求医师对一些不太可靠的地标位置进行验证。
{"title":"Assessing AudaxCeph®’s cephalometric tracing technology versus a semi-automated approach for analyzing severe Class II and Class III skeletons","authors":"Katherine O’Friel , Andrew Chapple , Richard Ballard , Paul Armbruster","doi":"10.1016/j.ortho.2024.100926","DOIUrl":"10.1016/j.ortho.2024.100926","url":null,"abstract":"<div><h3>Objective</h3><div>To evaluate the accuracy and precision of the AudaxCeph® fully automated software in identifying cephalometric landmarks on lateral cephalograms of Class II and Class III skeletal relationships, comparing its performance against experienced orthodontists using manual tracing within the same software environment.</div></div><div><h3>Material and methods</h3><div>Sixty cephalograms depicting severe Class II or Class III skeletal discrepancies were assessed by two board-certified orthodontists and AudaxCeph®’s artificial intelligence automatic tracing software. Among these, 40 cases were classified as Class II and 20 as Class III. An X–Y axis was established at the bottom left corner of each cephalogram, and subsequent X and Y coordinates for the landmarks were exported to Excel. Thirteen cephalometric landmarks were identified and used for comparing manual and automatic tracing methods, with no alteration of landmark positions post-tracing. Measures of the X coordinate, Y coordinate, and radial distance for each landmark were compared using <em>t</em>-tests for equivalence with a 2<!--> <!-->mm margin, both against AudaxCeph®’s positions and intra-operator reliability.</div></div><div><h3>Results</h3><div>Analysis revealed that while most operator measurements closely approximated AudaxCeph® values, discrepancies exceeding 2<!--> <!-->mm were notable at Gonion and Porion landmarks. Slight variability was noted in one instance during intra-examiner evaluation at the Gonion landmark.</div></div><div><h3>Conclusions</h3><div>This study concludes that AudaxCeph®’s artificial intelligence-driven automatic tracing of cephalograms offers a reliable and accurate method for orthodontic treatment planning across various skeletal types and severities. On average, it exhibits minimal discrepancies exceeding 2<!--> <!-->mm compared to manual operators, with notable variations observed primarily at the Gonion and Porion landmarks. While AudaxCeph® is an acceptable tool for cephalometric landmark location, it's accuracy still require the practitioner to verify some less reliable landmark locations.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100926"},"PeriodicalIF":1.8,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142394130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-30DOI: 10.1016/j.ortho.2024.100924
Yi Yang , Lu Liu , Qingsong Jiang , Qi Fan , Haoxin Zhang , Jialun Li , Wenli Lai , Hu Long
Objective
To analyse the biomechanics of molar protraction through clear aligner therapy (CAT) with and without a buccal cantilever.
Methods
Models were composed of mandible, lower dentition, periodontal ligaments, attachments, a buccal cantilever, and clear aligner. Four groups were designed: (1) control (aligner only), (2) aligner + buccal cantilever with buccal class II traction, (3) aligner + buccal cantilever with buccal class II and lingual class II tractions, (4) aligner + buccal cantilever with buccal horizontal traction named buccal class I, buccal class II, and lingual class II tractions.
Results
CAT alone caused mesial tipping, lingual tipping, and intrusion of mandibular second molar. Adding the buccal cantilever on the mandibular second molar with 100-g buccal class II traction was effective in preventing the mesial tipping of mandibular second molar, but resulted in a greater lingual tipping tendency. Further addition of lingual class II traction prevented aforementioned lingual tipping and bodily protraction was achieved in sagittal dimension, while buccal tipping was present. Bodily protraction without buccolingual tipping was achieved through clear aligner, buccal class II, lingual class II, and buccal class I tractions, and the stress concentrated on the alveolar bone was reduced.
Conclusion
CAT produced mesial tipping, lingual tipping, and intrusion of mandibular molar during protraction. The incorporation of the buccal cantilever into the clear aligner improves the biomechanical effect of molar protraction. Bodily molar protraction can be achieved with a judicious combination of buccal class II, lingual class II and buccal class I tractions with clear aligner and buccal cantilever.
{"title":"Cantilever-aided bodily protraction of a mandibular molar with clear aligner: A finite element analysis","authors":"Yi Yang , Lu Liu , Qingsong Jiang , Qi Fan , Haoxin Zhang , Jialun Li , Wenli Lai , Hu Long","doi":"10.1016/j.ortho.2024.100924","DOIUrl":"10.1016/j.ortho.2024.100924","url":null,"abstract":"<div><h3>Objective</h3><div>To analyse the biomechanics of molar protraction through clear aligner therapy (CAT) with and without a buccal cantilever.</div></div><div><h3>Methods</h3><div>Models were composed of mandible, lower dentition, periodontal ligaments, attachments, a buccal cantilever, and clear aligner. Four groups were designed: (1) control (aligner only), (2) aligner<!--> <!-->+<!--> <!-->buccal cantilever with buccal class II traction, (3) aligner<!--> <!-->+<!--> <!-->buccal cantilever with buccal class II and lingual class II tractions, (4) aligner<!--> <!-->+<!--> <!-->buccal cantilever with buccal horizontal traction named buccal class I, buccal class II, and lingual class II tractions.</div></div><div><h3>Results</h3><div>CAT alone caused mesial tipping, lingual tipping, and intrusion of mandibular second molar. Adding the buccal cantilever on the mandibular second molar with 100-g buccal class II traction was effective in preventing the mesial tipping of mandibular second molar, but resulted in a greater lingual tipping tendency. Further addition of lingual class II traction prevented aforementioned lingual tipping and bodily protraction was achieved in sagittal dimension, while buccal tipping was present. Bodily protraction without buccolingual tipping was achieved through clear aligner, buccal class II, lingual class II, and buccal class I tractions, and the stress concentrated on the alveolar bone was reduced.</div></div><div><h3>Conclusion</h3><div>CAT produced mesial tipping, lingual tipping, and intrusion of mandibular molar during protraction. The incorporation of the buccal cantilever into the clear aligner improves the biomechanical effect of molar protraction. Bodily molar protraction can be achieved with a judicious combination of buccal class II, lingual class II and buccal class I tractions with clear aligner and buccal cantilever.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100924"},"PeriodicalIF":1.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.ortho.2024.100923
Mohammad Amin Fahimi , Saeed Azarbayejani , Mahshid Mohammadi-Bassir
Introduction
Debonding of orthodontic brackets on ceramic restorations leave a rough surface which should be efficiently polished. In this study the effect of two diamond polishing systems (DPS), namely Optra Fine® (OF) and Diapol Twist® (DT) on surface roughness (SR) of feldspathic (F), lithium disilicate (LD), and translucent zirconia (TZ) ceramics assessed after bracket debonding.
Materials and methods
Ninety disc-shaped specimens fabricated from F, LD, and TZ ceramics and glazed (Gl). Ten glazed specimens of 3 ceramic types served as control (C) groups (n = 30). Other 60 specimens were deglazed, and after specific surface preparation according to ceramic type, upper central incisor brackets were bonded. After debonding, the remaining adhesive composite removed with tungsten carbide bur and specimens randomly assigned into 6 groups. The nine experimental groups defined as: Glazed F specimens (C), Deglazed F specimens polished with DT, Deglazed F specimens polished with OF, Glazed LD specimens (C), Deglazed LD specimens polished with DT, Deglazed LD specimens polished with OF, Glazed TZ specimens (C), Deglazed TZ specimens polished with DT, Deglazed TZ specimens polished with OF. The SR assessed quantitatively by profilometry (Ra and Rz parameter) and qualitatively by scanning electron microscopy (SEM). Quantitative data were statistically analysed using Kolmogorov-Smirnov test, two-way ANOVA and Tukey post-hoc test (α = 0.05).
Results
No significant difference found in SR of three glazed ceramic types (P = 0.293 for Ra and P = 0.473 for Rz). There was no significant difference of Ra between polished and glazed groups (P > 0.05). However, difference in Rz was significant (P < 0.05), and only TZ specimens could reach to the level of smoothness caused by glazing.
Conclusions
Both diamond polishing systems can efficiently reduce the surface roughness, despite of ceramic type. Optra Fine® system showed a superior performance than Diapol Twist® without significant difference.
Limitations
In this study only one brand of each ceramic type was investigated.
This study was approved by Ethical Review Committee (IR.IAU.KHUISF.REC.1401.156).
导言：陶瓷修复体上的正畸托槽脱粘后会留下粗糙的表面，应该对其进行有效抛光。本研究评估了两种金刚石抛光系统（DPS），即 Optra Fine® (OF) 和 Diapol Twist® (DT)，在托槽脱粘后对长石（F）、二硅酸锂（LD）和半透明氧化锆（TZ）陶瓷表面粗糙度（SR）的影响。3 种陶瓷的 10 个上釉试样作为对照（C）组（n = 30）。其他 60 个试样经过脱釉处理，并根据陶瓷类型进行特定的表面处理后，粘接上中切牙托架。剥离后，用碳化钨毛刺去除剩余的复合粘合剂，然后将试样随机分为 6 组。这九个实验组分别是上釉 F 试样（C）、用 DT 抛光的脱釉 F 试样、用 OF 抛光的脱釉 F 试样、上釉 LD 试样（C）、用 DT 抛光的脱釉 LD 试样、用 OF 抛光的脱釉 LD 试样、上釉 TZ 试样（C）、用 DT 抛光的脱釉 TZ 试样、用 OF 抛光的脱釉 TZ 试样。通过轮廓仪（Ra 和 Rz 参数）对 SR 进行定量评估，通过扫描电子显微镜（SEM）对 SR 进行定性评估。定量数据采用 Kolmogorov-Smirnov 检验、双向方差分析和 Tukey 事后检验（α = 0.05）进行统计分析。抛光组和施釉组的 Ra 没有明显差异（P > 0.05）。结论无论陶瓷类型如何，两种金刚石抛光系统都能有效降低表面粗糙度。本研究只调查了每种陶瓷类型的一个品牌。本研究获得了伦理审查委员会（IR.IAU.KHUISF.REC.1401.156）的批准。
{"title":"Comparing the effect of two polishing systems on surface roughness of feldspathic, lithium disilicate, and translucent zirconia ceramics after orthodontic bracket debonding: An in vitro study","authors":"Mohammad Amin Fahimi , Saeed Azarbayejani , Mahshid Mohammadi-Bassir","doi":"10.1016/j.ortho.2024.100923","DOIUrl":"10.1016/j.ortho.2024.100923","url":null,"abstract":"<div><h3>Introduction</h3><div>Debonding of orthodontic brackets on ceramic restorations leave a rough surface which should be efficiently polished. In this study the effect of two diamond polishing systems (DPS), namely Optra Fine® (OF) and Diapol Twist® (DT) on surface roughness (SR) of feldspathic (F), lithium disilicate (LD), and translucent zirconia (TZ) ceramics assessed after bracket debonding.</div></div><div><h3>Materials and methods</h3><div>Ninety disc-shaped specimens fabricated from F, LD, and TZ ceramics and glazed (Gl). Ten glazed specimens of 3 ceramic types served as control (C) groups (<em>n</em> <!-->=<!--> <!-->30). Other 60 specimens were deglazed, and after specific surface preparation according to ceramic type, upper central incisor brackets were bonded. After debonding, the remaining adhesive composite removed with tungsten carbide bur and specimens randomly assigned into 6 groups. The nine experimental groups defined as: Glazed F specimens (C), Deglazed F specimens polished with DT, Deglazed F specimens polished with OF, Glazed LD specimens (C), Deglazed LD specimens polished with DT, Deglazed LD specimens polished with OF, Glazed TZ specimens (C), Deglazed TZ specimens polished with DT, Deglazed TZ specimens polished with OF. The SR assessed quantitatively by profilometry (Ra and Rz parameter) and qualitatively by scanning electron microscopy (SEM). Quantitative data were statistically analysed using Kolmogorov-Smirnov test, two-way ANOVA and Tukey post-hoc test (α<!--> <!-->=<!--> <!-->0.05).</div></div><div><h3>Results</h3><div>No significant difference found in SR of three glazed ceramic types (<em>P</em> <!-->=<!--> <!-->0.293 for Ra and <em>P</em> <!-->=<!--> <!-->0.473 for Rz). There was no significant difference of Ra between polished and glazed groups (<em>P</em> <!-->><!--> <!-->0.05). However, difference in Rz was significant (<em>P</em> <!--><<!--> <!-->0.05), and only TZ specimens could reach to the level of smoothness caused by glazing.</div></div><div><h3>Conclusions</h3><div>Both diamond polishing systems can efficiently reduce the surface roughness, despite of ceramic type. Optra Fine® system showed a superior performance than Diapol Twist® without significant difference.</div></div><div><h3>Limitations</h3><div>In this study only one brand of each ceramic type was investigated.</div><div>This study was approved by Ethical Review Committee (IR.IAU.KHUISF.REC.1401.156).</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100923"},"PeriodicalIF":1.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-23DOI: 10.1016/j.ortho.2024.100922
Vincent Thomas , Gaëlle Dol , Ziad Tannouri , Olivier François , Emmanuel Nicolas , Delphine Soulier-Peigue , Marwan El Helou
Objective
This in vitro study aimed to evaluate the torque expression efficiency when it is integrated into the bracket slot versus the bracket base. Additionally, the impact of archwire geometry (rectangular vs. rhomboid) on torque expression has been examined.
Material and methods
The torque expression was evaluated in a full arch printed maxillary model, focusing on tooth #11, which was positioned within an alveolus filled with Typodont wax. Three different types of brackets were utilized: conventional metallic bracket (Minidiamond™), self-ligating bracket with torque in base (Damon Q2™), and a new self-ligating bracket design with torque in slot (Damon Ultima™). Two variations of archwires were used: rectangular and rhomboid stainless steel, measuring 0.019 × 0.025 inches and 0.019 × 0.0275 inches, respectively, from ORMCO™. The study included seven groups: six experimental groups and a control group, with 15 measurements in each group, totaling 105 torque measurements. Optical impressions were taken of the tooth's original position and its final position after torque expression. STL files were superimposed using GEOMAGIC software to calculate the percentage of torque expression.
Results
The self-ligating bracket with torque in slot (Damon Ultima™) shows significantly higher torque expression than the self-ligating bracket with torque in base (Damon Q2™) with a rectangular stainless steel archwire (P = 0.00015). The Ultima™ bracket also demonstrates higher torque expression than both the Q2™ and conventional 22° brackets with a rhomboid stainless steel archwire (P < 0.003). No significant difference in torque expression was found between the rectangular and rhomboid stainless steel archwires for any bracket group (P > 0.05).
Conclusions
The self-ligating bracket with torque in slot shows comparable torque expression effectiveness to the conventional bracket, outperforming the self-ligating bracket with torque in base. Archwire geometry does not significantly impact torque expression.
{"title":"Exploring bracket torque expression: A comparative in vitro study of new self-ligating bracket designs and archwire geometries","authors":"Vincent Thomas , Gaëlle Dol , Ziad Tannouri , Olivier François , Emmanuel Nicolas , Delphine Soulier-Peigue , Marwan El Helou","doi":"10.1016/j.ortho.2024.100922","DOIUrl":"10.1016/j.ortho.2024.100922","url":null,"abstract":"<div><h3>Objective</h3><div>This in vitro study aimed to evaluate the torque expression efficiency when it is integrated into the bracket slot versus the bracket base. Additionally, the impact of archwire geometry (rectangular vs. rhomboid) on torque expression has been examined.</div></div><div><h3>Material and methods</h3><div>The torque expression was evaluated in a full arch printed maxillary model, focusing on tooth #11, which was positioned within an alveolus filled with Typodont wax. Three different types of brackets were utilized: conventional metallic bracket (Minidiamond™), self-ligating bracket with torque in base (Damon Q2™), and a new self-ligating bracket design with torque in slot (Damon Ultima™). Two variations of archwires were used: rectangular and rhomboid stainless steel, measuring 0.019<!--> <!-->×<!--> <!-->0.025 inches and 0.019<!--> <!-->×<!--> <!-->0.0275 inches, respectively, from ORMCO™. The study included seven groups: six experimental groups and a control group, with 15 measurements in each group, totaling 105 torque measurements. Optical impressions were taken of the tooth's original position and its final position after torque expression. STL files were superimposed using GEOMAGIC software to calculate the percentage of torque expression.</div></div><div><h3>Results</h3><div>The self-ligating bracket with torque in slot (Damon Ultima™) shows significantly higher torque expression than the self-ligating bracket with torque in base (Damon Q2™) with a rectangular stainless steel archwire (<em>P</em> <!-->=<!--> <!-->0.00015). The Ultima™ bracket also demonstrates higher torque expression than both the Q2™ and conventional 22° brackets with a rhomboid stainless steel archwire (<em>P</em> <!--><<!--> <!-->0.003). No significant difference in torque expression was found between the rectangular and rhomboid stainless steel archwires for any bracket group (<em>P</em> <!-->><!--> <!-->0.05).</div></div><div><h3>Conclusions</h3><div>The self-ligating bracket with torque in slot shows comparable torque expression effectiveness to the conventional bracket, outperforming the self-ligating bracket with torque in base. Archwire geometry does not significantly impact torque expression.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100922"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1761722724000780/pdfft?md5=e8bcee05c2cd1c9ec41d6248cbbcf6d8&pid=1-s2.0-S1761722724000780-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-23DOI: 10.1016/j.ortho.2024.100921
Rashad I. Shaadouh , Mohammad Y. Hajeer , Mohammed Adel Awawdeh , Samer T. Jaber , Ghiath A. Mahmoud , Imad-Addin Almasri
<div><h3>Introduction</h3><div>Many efforts have been made to shorten fixed appliance orthodontic treatment time by accelerating the rate of tooth movement. Low-intensity electrical stimulation (LIES) is one of the proposed physical methods that has not yet been well studied in the medical literature. This study aimed to evaluate the effectiveness of LIES in accelerating orthodontic tooth movement in cases of en-mass retraction of the upper anterior teeth.</div></div><div><h3>Methods</h3><div>Patients who attended the Department of Orthodontics at the Faculty of Dentistry, University of Damascus, between September 2019 and February 2021, for treatment were carefully checked. All patients who met the eligibility criteria were invited to participate in this RCT. Young adult patients having class II division I malocclusion were equally and randomly assigned into the low-intensity electrical stimulation group (LIES), and traditional en-masse retraction group (TRAD). The mini-implants assisted en-masse retraction technique was used to close the extracted upper first premolar spaces in both groups. NiTi closed coil springs (250<!--> <!-->g/side) were used. Electrical stimulation of 15-20<!--> <!-->μA for each tooth was applied on the upper anterior teeth using a recently developed intraorally removable device in the LIES group. The primary outcome was the en-masse retraction rate, the secondary outcomes were changes in the first molar position, intermolar width, and intercanine width. These outcomes were measured on the digital photographs of the maxilla cast using the Image J program. Two-sample t-test with Bonferroni's correction was utilized to explore any significant differences between the two groups in all studied variables.</div></div><div><h3>Results</h3><div>Of the 168 patients examined by the researcher, 38 patients with Class II division I malocclusion (30 females and 8 males; mean age: 21.1<!--> <!-->±<!--> <!-->2.31 years) were finally recruited in this RCT. The overall en-masse retraction rate was significantly greater in the LIES group compared to the TRAD group (1.02<!--> <!-->±<!--> <!-->0.08, 0.73<!--> <!-->±<!--> <!-->0.04<!--> <!-->mm/month respectively; <em>P</em> <!--><<!--> <!-->0.001). In addition, the monthly rate of space closure was significantly greater in this group at all evaluation times (<em>P</em> <!--><<!--> <!-->0.001). A small increase was noted in the intercanine width (1.60<!--> <!-->±<!--> <!-->0.27, and 1.65<!--> <!-->±<!--> <!-->0.33<!--> <!-->mm respectively). Negligible changes were noted in the first molar positions and intermolar width, with insignificant differences between the two groups.</div></div><div><h3>Conclusions</h3><div>LIES according to the protocol applied in this trial accelerated the upper anterior teeth en-masse retraction rate by approximately 28% compared to the traditional en-masse retraction method. While this acceleration was statistically significant, may not have substantial clin
{"title":"Effectiveness of low-intensity electrical current in accelerating the en-masse retraction of the upper anterior teeth following first-premolar extraction in young adult patients with Class II division 1 malocclusion: A randomized controlled clinical trial","authors":"Rashad I. Shaadouh , Mohammad Y. Hajeer , Mohammed Adel Awawdeh , Samer T. Jaber , Ghiath A. Mahmoud , Imad-Addin Almasri","doi":"10.1016/j.ortho.2024.100921","DOIUrl":"10.1016/j.ortho.2024.100921","url":null,"abstract":"<div><h3>Introduction</h3><div>Many efforts have been made to shorten fixed appliance orthodontic treatment time by accelerating the rate of tooth movement. Low-intensity electrical stimulation (LIES) is one of the proposed physical methods that has not yet been well studied in the medical literature. This study aimed to evaluate the effectiveness of LIES in accelerating orthodontic tooth movement in cases of en-mass retraction of the upper anterior teeth.</div></div><div><h3>Methods</h3><div>Patients who attended the Department of Orthodontics at the Faculty of Dentistry, University of Damascus, between September 2019 and February 2021, for treatment were carefully checked. All patients who met the eligibility criteria were invited to participate in this RCT. Young adult patients having class II division I malocclusion were equally and randomly assigned into the low-intensity electrical stimulation group (LIES), and traditional en-masse retraction group (TRAD). The mini-implants assisted en-masse retraction technique was used to close the extracted upper first premolar spaces in both groups. NiTi closed coil springs (250<!--> <!-->g/side) were used. Electrical stimulation of 15-20<!--> <!-->μA for each tooth was applied on the upper anterior teeth using a recently developed intraorally removable device in the LIES group. The primary outcome was the en-masse retraction rate, the secondary outcomes were changes in the first molar position, intermolar width, and intercanine width. These outcomes were measured on the digital photographs of the maxilla cast using the Image J program. Two-sample t-test with Bonferroni's correction was utilized to explore any significant differences between the two groups in all studied variables.</div></div><div><h3>Results</h3><div>Of the 168 patients examined by the researcher, 38 patients with Class II division I malocclusion (30 females and 8 males; mean age: 21.1<!--> <!-->±<!--> <!-->2.31 years) were finally recruited in this RCT. The overall en-masse retraction rate was significantly greater in the LIES group compared to the TRAD group (1.02<!--> <!-->±<!--> <!-->0.08, 0.73<!--> <!-->±<!--> <!-->0.04<!--> <!-->mm/month respectively; <em>P</em> <!--><<!--> <!-->0.001). In addition, the monthly rate of space closure was significantly greater in this group at all evaluation times (<em>P</em> <!--><<!--> <!-->0.001). A small increase was noted in the intercanine width (1.60<!--> <!-->±<!--> <!-->0.27, and 1.65<!--> <!-->±<!--> <!-->0.33<!--> <!-->mm respectively). Negligible changes were noted in the first molar positions and intermolar width, with insignificant differences between the two groups.</div></div><div><h3>Conclusions</h3><div>LIES according to the protocol applied in this trial accelerated the upper anterior teeth en-masse retraction rate by approximately 28% compared to the traditional en-masse retraction method. While this acceleration was statistically significant, may not have substantial clin","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100921"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-23DOI: 10.1016/j.ortho.2024.100919
Aymar de Leotard, Elvire Le Norcy
Introduction
The demand for faster and invisible orthodontic treatments has led to the increased use of clear aligners, facilitated by advancements in digital treatment planning. This study aims to evaluate the reliability of digital orthodontic setups performed by orthodontists compared to those by 3Shape Design Service®engineers.
Material and methods
A monocentric, cross-sectional observational study was conducted at Bretonneau Hospital from October 2022 to May 2023. All patients meeting the inclusion criteria and willing to participate were included in the study. Intraoral scans were used to create treatment setups using the Ortho System® software, performed by both orthodontists and 3Shape® engineers. The primary objective was to compare the dental movements (rotation, intrusion, extrusion, buccolingual inclination, tipping, mesiodistal translation and buccolingual translation) between the two groups. Secondary objectives included the number of teeth displaced, aligners needed, interproximal enamel reduction and number of attachments placed.
Results
Nineteen patients with mild to moderate malocclusion were included. Statistically significant differences were found in tooth displacements between the two groups with engineers executing greater dental movements for derotation (4.9 ± 2.6 vs. 3.7 ± 2.3), tipping (0.79 ± 0.69 vs. 0.26 ± 0.44), bucco-lingual (0.40 ± 0.26 vs. 0.08 ± 0.11) and mesio-distal translations (0.31 ± 0.20 vs. 0.20 ± 0.17). Secondary measures showed no significant differences except for the number of teeth displaced (15.32 ± 5.21 vs. 9.68 ± 4.82), which was higher in the 3Shape group.
Discussion
While digital setups by engineers showed more significant tooth movements, the practical impact on mild malocclusion treatment was minimal. This study highlights the need for precise treatment objectives and consideration of overcorrection practices.
Conclusion
For mild malocclusions, outsourcing setups to 3Shape engineers can be an alternative to in-office setups by orthodontists. However, further studies are needed to evaluate setup reliability for more complex malocclusions.
导言：数字化治疗计划的发展促进了对更快和隐形正畸治疗的需求，从而使透明矫治器的使用越来越多。本研究旨在评估正畸医生与 3Shape Design Service® 工程师进行的数字化正畸设置的可靠性。材料和方法2022 年 10 月至 2023 年 5 月在布列塔尼医院进行了一项单中心横断面观察性研究。所有符合纳入标准并愿意参与的患者均被纳入研究。口内扫描用于使用 Ortho System® 软件创建治疗设置，由正畸医生和 3Shape® 工程师共同完成。首要目标是比较两组患者的牙齿移动情况（旋转、内收、外翻、颊舌侧倾斜、翻转、中髁侧平移和颊舌侧平移）。次要目标包括移位牙齿的数量、所需的矫治器、近侧釉质减少以及所安置的附着体数量。两组患者在牙齿移位方面存在明显的统计学差异，工程师的牙齿移位幅度更大，包括脱位（4.9 ± 2.6 vs. 3.7 ± 2.3）、倾倒（0.79 ± 0.69 vs. 0.26 ± 0.44）、颊舌侧移位（0.40 ± 0.26 vs. 0.08 ± 0.11）和中远侧移位（0.31 ± 0.20 vs. 0.20 ± 0.17）。除了3Shape组的牙齿移位数（15.32 ± 5.21 vs. 9.68 ± 4.82）更高外，其他次要指标均无明显差异。讨论虽然工程师的数字化设置显示出更明显的牙齿移动，但对轻度错合畸形治疗的实际影响很小。结论对于轻度错颌畸形，将设置工作外包给 3Shape 工程师可以替代正畸医生的诊室设置。然而，对于更复杂的错合畸形，还需要进一步的研究来评估设置的可靠性。
{"title":"Comparison of dental movements in digital setups created by orthodontists and “3shape design service®” engineers: A cross-sectional study","authors":"Aymar de Leotard, Elvire Le Norcy","doi":"10.1016/j.ortho.2024.100919","DOIUrl":"10.1016/j.ortho.2024.100919","url":null,"abstract":"<div><h3>Introduction</h3><div>The demand for faster and invisible orthodontic treatments has led to the increased use of clear aligners, facilitated by advancements in digital treatment planning. This study aims to evaluate the reliability of digital orthodontic setups performed by orthodontists compared to those by 3Shape Design Service®engineers.</div></div><div><h3>Material and methods</h3><div>A monocentric, cross-sectional observational study was conducted at Bretonneau Hospital from October 2022 to May 2023. All patients meeting the inclusion criteria and willing to participate were included in the study. Intraoral scans were used to create treatment setups using the Ortho System® software, performed by both orthodontists and 3Shape® engineers. The primary objective was to compare the dental movements (rotation, intrusion, extrusion, buccolingual inclination, tipping, mesiodistal translation and buccolingual translation) between the two groups. Secondary objectives included the number of teeth displaced, aligners needed, interproximal enamel reduction and number of attachments placed.</div></div><div><h3>Results</h3><div>Nineteen patients with mild to moderate malocclusion were included. Statistically significant differences were found in tooth displacements between the two groups with engineers executing greater dental movements for derotation (4.9<!--> <!-->±<!--> <!-->2.6 vs. 3.7<!--> <!-->±<!--> <!-->2.3), tipping (0.79<!--> <!-->±<!--> <!-->0.69 vs. 0.26<!--> <!-->±<!--> <!-->0.44), bucco-lingual (0.40<!--> <!-->±<!--> <!-->0.26 vs. 0.08<!--> <!-->±<!--> <!-->0.11) and mesio-distal translations (0.31<!--> <!-->±<!--> <!-->0.20 vs. 0.20<!--> <!-->±<!--> <!-->0.17). Secondary measures showed no significant differences except for the number of teeth displaced (15.32<!--> <!-->±<!--> <!-->5.21 vs. 9.68<!--> <!-->±<!--> <!-->4.82), which was higher in the 3Shape group.</div></div><div><h3>Discussion</h3><div>While digital setups by engineers showed more significant tooth movements, the practical impact on mild malocclusion treatment was minimal. This study highlights the need for precise treatment objectives and consideration of overcorrection practices.</div></div><div><h3>Conclusion</h3><div>For mild malocclusions, outsourcing setups to 3Shape engineers can be an alternative to in-office setups by orthodontists. However, further studies are needed to evaluate setup reliability for more complex malocclusions.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100919"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1761722724000755/pdfft?md5=ae1a803e1ff0c3d31fc83187b53ab02b&pid=1-s2.0-S1761722724000755-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-23DOI: 10.1016/j.ortho.2024.100920
Maria Francesca Sfondrini , Federica Gariboldi , Roberto Alcozer , Domenico Sfondrini , Andrea Scribante
Introduction
After the mandibular third molars, the maxillary canines are the most displaced or impacted teeth in permanent dentition. Surgical-orthodontic disimpaction of impacted canines, followed by aesthetic reconstructions, can be a successful treatment choice.
Aim
The aim of this case report was to describe the smile restoration through simultaneous surgical disimpaction of the two upper permanent canines in a 13-year-old patient who also presented with agenesis of the right upper lateral incisor and a conoid-shaped left upper lateral incisor.
Treatment protocol
The present case report followed the Care Checklist For Case Reports. After having completed the multibrackets fixed orthodontic therapy phase necessary for the preparation of the anchorage, avulsions of the upper deciduous canines were carried out, followed by the making of surgical full thickness palatal flap in order to perform traction of the permanent canines, and an orthodontic eyelet with passive metal looped ligatures was applied. One week after the surgery, traction was started with Crescini-double arch technique. Subsequently, the avulsion of elements 2.2 and 5.2 were executed. At the end of orthodontic treatment, in order to optimise the aesthetics and function of the canines, a restorative treatment was carried out.
Results and conclusions
After the surgical creation of a palatal flap, the disimpaction of the two upper canines, using the double arch technique, allowed the teeth to be moved into the desired position on the upper arch.
{"title":"Surgical-orthodontic approach of two palatally impacted canines with maxillary lateral incisor anomalies in a growing class II patient: A case report","authors":"Maria Francesca Sfondrini , Federica Gariboldi , Roberto Alcozer , Domenico Sfondrini , Andrea Scribante","doi":"10.1016/j.ortho.2024.100920","DOIUrl":"10.1016/j.ortho.2024.100920","url":null,"abstract":"<div><h3>Introduction</h3><div>After the mandibular third molars, the maxillary canines are the most displaced or impacted teeth in permanent dentition. Surgical-orthodontic disimpaction of impacted canines, followed by aesthetic reconstructions, can be a successful treatment choice.</div></div><div><h3>Aim</h3><div>The aim of this case report was to describe the smile restoration through simultaneous surgical disimpaction of the two upper permanent canines in a 13-year-old patient who also presented with agenesis of the right upper lateral incisor and a conoid-shaped left upper lateral incisor.</div></div><div><h3>Treatment protocol</h3><div>The present case report followed the Care Checklist For Case Reports. After having completed the multibrackets fixed orthodontic therapy phase necessary for the preparation of the anchorage, avulsions of the upper deciduous canines were carried out, followed by the making of surgical full thickness palatal flap in order to perform traction of the permanent canines, and an orthodontic eyelet with passive metal looped ligatures was applied. One week after the surgery, traction was started with Crescini-double arch technique. Subsequently, the avulsion of elements 2.2 and 5.2 were executed. At the end of orthodontic treatment, in order to optimise the aesthetics and function of the canines, a restorative treatment was carried out.</div></div><div><h3>Results and conclusions</h3><div>After the surgical creation of a palatal flap, the disimpaction of the two upper canines, using the double arch technique, allowed the teeth to be moved into the desired position on the upper arch.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100920"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1761722724000767/pdfft?md5=1c87419a23740209486815d5a4d4adfb&pid=1-s2.0-S1761722724000767-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-05DOI: 10.1016/j.ortho.2024.100915
Nehal F. Albelasy , Ahmad M. Hafez , Dina S. Farahat , Marwa S. Shamaa
Background
The removal of adhesive remnants after bracket debonding has been shown to cause damaging effects on the enamel surface. This study aimed to investigate the efficacy of stained adhesive remnant removal (ARR) on enamel roughness compared to translucent composite.
Material and methods
Thirty extracted premolar teeth were divided equally into three groups; conventional composite control group (CC), stained composite group (SC) and stained bonding solution group (SB). The buccal surface of each tooth was cleaned, dried and the surface roughness (Ra) was evaluated using a contact prophylometer (T0). After bracket debonding, a high-speed carbide bur under a water-cooling system was used for ARR in one direction and the time consumed for ARR was recorded. After ARR, the second mean Ra values were recorded (T1). The samples were then polished using polishing paste with low-speed rubber cup and the third mean Ra values were recorded (T2).
Results
Repeated one-way ANOVA revealed a significant difference in the mean Ra values at T0, T1 and T2 within each group P ˂ 0.05. A statistically significant difference in the changes of the mean Ra values after ARR (T1–T0) and after polishing (T1–T2) was found between the CC group and both SC and SB groups. A significant difference in the time consumed for ARR was found between the three groups with CC group being the most time-consuming group.
Conclusion
Stained composite material followed by the stained bonding solution provided better visibility during ARR with lower mean Ra values and less time for ARR compared totranslucent composite material.
背景：研究表明，去除托槽脱粘后的残余粘接剂会对牙釉质表面造成损害。本研究旨在探讨染色残余粘接剂去除（ARR）与半透明复合材料相比对牙釉质粗糙度的影响：将 30 颗拔除的前臼齿平均分为三组：传统复合材料对照组（CC）、染色复合材料组（SC）和染色粘接剂组（SB）。每颗牙齿的颊面都经过清洁、干燥，并使用接触式温度计（T0）评估表面粗糙度（Ra）。托槽脱粘后，在水冷系统下使用高速硬质合金钻头进行单向 ARR，并记录 ARR 所消耗的时间。ARR 之后，记录第二个平均 Ra 值（T1）。然后使用抛光膏和低速橡胶杯对样品进行抛光，记录第三次平均 Ra 值（T2）：结果：重复单因素方差分析显示，各组在 T0、T1 和 T2 时的平均 Ra 值差异显著，P˂0.05。CC 组与 SC 组和 SB 组在 ARR（T1-T0）和抛光（T1-T2）后的平均 Ra 值变化差异有统计学意义。三组之间在 ARR 所耗时间上存在明显差异，其中 CC 组耗时最长：结论：与半透明复合材料相比，染色复合材料和染色粘接剂能在 ARR 过程中提供更好的能见度，平均 Ra 值更低，ARR 耗时更短。
{"title":"Does staining orthodontic adhesive provide an advantage in adhesive resin removal and enamel roughness? An in vitro study","authors":"Nehal F. Albelasy , Ahmad M. Hafez , Dina S. Farahat , Marwa S. Shamaa","doi":"10.1016/j.ortho.2024.100915","DOIUrl":"10.1016/j.ortho.2024.100915","url":null,"abstract":"<div><h3>Background</h3><p>The removal of adhesive remnants after bracket debonding has been shown to cause damaging effects on the enamel surface. This study aimed to investigate the efficacy of stained adhesive remnant removal (ARR) on enamel roughness compared to translucent composite.</p></div><div><h3>Material and methods</h3><p>Thirty extracted premolar teeth were divided equally into three groups; conventional composite control group (CC), stained composite group (SC) and stained bonding solution group (SB). The buccal surface of each tooth was cleaned, dried and the surface roughness (Ra) was evaluated using a contact prophylometer (T0). After bracket debonding, a high-speed carbide bur under a water-cooling system was used for ARR in one direction and the time consumed for ARR was recorded. After ARR, the second mean Ra values were recorded (T1). The samples were then polished using polishing paste with low-speed rubber cup and the third mean Ra values were recorded (T2).</p></div><div><h3>Results</h3><p>Repeated one-way ANOVA revealed a significant difference in the mean Ra values at T0, T1 and T2 within each group <em>P</em> <!-->˂<!--> <!-->0.05. A statistically significant difference in the changes of the mean Ra values after ARR (T1–T0) and after polishing (T1–T2) was found between the CC group and both SC and SB groups. A significant difference in the time consumed for ARR was found between the three groups with CC group being the most time-consuming group.</p></div><div><h3>Conclusion</h3><p>Stained composite material followed by the stained bonding solution provided better visibility during ARR with lower mean Ra values and less time for ARR compared totranslucent composite material.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100915"},"PeriodicalIF":1.8,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142146566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-05DOI: 10.1016/j.ortho.2024.100918
Haoxin Zhang , Huimin Hu , Donger Lin , Maierdanjiang Rouzi , Di Shan , Wenli Lai , Hu Long
Premature loss of first permanent molars is a common occurrence in clinical practice, leading to abnormal occlusion and inefficient mastication for patients. This case report presented the orthodontic retreatment of a 32-year-old female patient who suffered from premature loss of mandibular bilateral first molars. The mesial tipping of the mandibular second molars led to an occlusal interference, resulting in a clockwise rotation of the lower jaw and an anterior open bite (AOB). We achieved long-distance molar mesialization using clear aligners with Albert cantilever arms. After 42 months of treatment, the patient's occlusion and facial profile significantly improved. The cantilever combined with the cleat aligner treatment has been clinically effective for the protraction of mandibular posterior teeth, extending the field of application of clear aligners.
{"title":"Clear aligner treatment of an adult open bite with bilateral missing mandibular first molars through molar protraction with Albert cantilever arms","authors":"Haoxin Zhang , Huimin Hu , Donger Lin , Maierdanjiang Rouzi , Di Shan , Wenli Lai , Hu Long","doi":"10.1016/j.ortho.2024.100918","DOIUrl":"10.1016/j.ortho.2024.100918","url":null,"abstract":"<div><p>Premature loss of first permanent molars is a common occurrence in clinical practice, leading to abnormal occlusion and inefficient mastication for patients. This case report presented the orthodontic retreatment of a 32-year-old female patient who suffered from premature loss of mandibular bilateral first molars. The mesial tipping of the mandibular second molars led to an occlusal interference, resulting in a clockwise rotation of the lower jaw and an anterior open bite (AOB). We achieved long-distance molar mesialization using clear aligners with Albert cantilever arms. After 42 months of treatment, the patient's occlusion and facial profile significantly improved. The cantilever combined with the cleat aligner treatment has been clinically effective for the protraction of mandibular posterior teeth, extending the field of application of clear aligners.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100918"},"PeriodicalIF":1.8,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142146565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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