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Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis. 多区镍钛弓丝弯曲的热力学性能:检索分析。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-03-25 DOI: 10.4041/kjod22.183
Panagiotis Roulias, Ioulia-Maria Mylonopoulou, Iosif Sifakakis, Christoph Bourauel, Theodore Eliades

Objective: This study aimed to compare the mechanical and thermal properties in the anterior and posterior segments of new and retrieved specimens of a commercially available multizone superelastic nickel-titanium (NiTi) archwire.

Methods: The following groups of 0.016 × 0.022-inch Bioforce NiTi archwires were compared: a) anterior and b) posterior segments of new specimens and c) anterior and d) posterior segments of retrieved specimens. Six specimens were evaluated in each group, by three-point bending and bend and free recovery tests. Bending moduli (Eb) were calculated. Furthermore, the new specimens were evaluated with scanning electron microscopy/energy-dispersive X-ray spectrometry. A multiple linear regression model with a random intercept at the wire level was applied for data analysis.

Results: The forces in the posterior segments or new specimens were higher than those recorded in the anterior segments or retrieved specimens, respectively. Accordingly, Eb also varied. Higher austenite start and austenite finish (Af) temperatures were recorded in the anterior segments. No statistically significant differences were found for these temperatures between retrieved and new wires. The mean elemental composition was (weight percentage): Ni, 52.6 ± 0.5; Ti, 47.4 ± 0.5.

Conclusions: The existence of multiple force zones was confirmed in new and retrieved Bioforce archwires. The retrieved archwires demonstrated lower forces during the initial stages of deactivation in three-point bending tests, compared with new specimens. The Af temperature of these archwires may lie higher than the regular intraoral temperature. Even at 2 mm deflections, the forces recorded from these archwires may lie beyond biologically safe limits.

目的:本研究旨在比较市售的多区超弹性镍钛(NiTi)弓丝前后段的力学和热性能。方法:比较0.016 × 0.022英寸Bioforce NiTi弓丝组:a)前、b)新标本前、后段,c)前、d)回收标本后段。通过三点弯曲、弯曲和自由恢复试验,对每组6个标本进行评估。计算了弯曲模量(Eb)。并用扫描电镜/能量色散x射线能谱法对新试样进行了评价。采用钢丝水平随机截距的多元线性回归模型进行数据分析。结果:后节段和新标本的受力分别高于前节和取出标本的受力。相应地,Eb也有所不同。较高的奥氏体起始温度和奥氏体结束温度记录在前段。在回收的电线和新的电线之间,这些温度没有统计学上的显著差异。平均元素组成为(重量百分比):Ni, 52.6±0.5;Ti, 47.4±0.5。结论:在新的和回收的Bioforce弓丝中证实存在多个受力区。在三点弯曲试验中,与新试件相比,回收的弓丝在失活的初始阶段显示出较低的受力。这些弧线的温度可能高于正常的口内温度。即使在2毫米的偏转下,从这些弓线记录的力也可能超出生物安全极限。
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引用次数: 1
Three-dimensional evaluation of the mandibular condyle in adults with various skeletal patterns. 不同骨骼形态的成人下颌髁的三维评估。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-03-25 DOI: 10.4041/kjod22.076
Ahmed Maher Mohsen, Junjie Ye, Akram Al-Nasri, Catherine Chu, Wei-Bing Zhang

Objective: Morphometric and morphological evaluation of the mandibular condyle in adults and to identify its correlation with skeletal malocclusion patterns.

Methods: Cone-beam computed tomography scans of 135 adult patients were used in this study and classified into groups according to four criteria: (1) sex (male and female); (2) sagittal skeletal discrepancy (Class I, Class II, and Class III); (3) vertical skeletal discrepancy (hyperdivergent, normodivergent, and hypodivergent); and age (group 1 ≤ 20 years, 21 ≤ group 2 < 30, and group 3 ≥ 30 years). The morphometrical variables were mandibular condyle height and width, and the morphological variable was the mandibular condyle shape in coronal and sagittal sections. Three-dimensional standard tessellation language files were created using itk-snap (open-source software), and measurements were performed using Meshmixer (open-source software).

Results: The mandibular condyle height was significantly greater (p < 0.05) in patients with class III malocclusion than in those with class I or II malocclusion; the mandibular condyle width was not significantly different among different sexes, age groups, and sagittal and vertical malocclusions. There were no statistical associations between various mandibular condyle shapes and the sexes, age groups, and skeletal malocclusions.

Conclusions: The condylar height was greatest in patients with class III malocclusion. The condylar height and width were greater among males than in females. The mandibular condyle shapes observed in sagittal and coronal sections did not affect the skeletal malocclusion patterns.

目的:探讨成人下颌髁突的形态计量学和形态学特征,并探讨其与骨错合模式的关系。方法:对135例成人患者进行锥形束ct扫描,并按4个标准进行分组:(1)性别(男、女);(2)矢状面骨骼差异(ⅰ类、ⅱ类和ⅲ类);(3)垂直骨骼差异(超发散、无收敛和低发散);年龄(1组≤20岁,21≤2组< 30岁,3组≥30岁)。形态学变量为髁突高度和宽度,形态学变量为冠状面和矢状面髁突形状。使用itk-snap(开源软件)创建三维标准镶嵌语言文件,并使用Meshmixer(开源软件)进行测量。结果:III类错颌患者的髁突高度显著高于I、II类错颌患者(p < 0.05);下颌髁突宽度在不同性别、年龄、矢状和垂直错颌间无显著差异。不同的下颌髁突形状与性别、年龄组和骨骼错咬合没有统计学上的联系。结论:III类错牙合患者的髁突高度最大。男性的髁突高度和宽度大于女性。矢状面和冠状面所观察到的下颌髁突形状不影响骨骼错牙合类型。
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引用次数: 1
Effect of orthodontic bonding with different surface treatments on color stability and translucency of full cubic stabilized zirconia after coffee thermocycling. 正畸结合不同表面处理对咖啡热循环后全立方稳定氧化锆颜色稳定性和半透明性的影响。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-02-10 DOI: 10.4041/kjod22.144
Yasamin Babaee Hemmati, Hamid Neshandar Asli, Alireza Mahmoudi Nahavandi, Nika Safari, Mehran Falahchai

Objective: To assess the color stability and translucency of full cubic stabilized zirconia (FSZ) following orthodontic bonding with different surface treatments and coffee thermocycling (CTC).

Methods: This in vitro study was conducted on 120 disc-shaped specimens of FSZ. Thirty specimens were selected as the control group and remained intact. The remaining specimens were randomly divided into three groups based on the type of surface treatment (n = 30): airborne particle abrasion (APA), silica-coating (CoJet), and carbon dioxide (CO2) laser. After metal bracket bonding in the test groups, debonding and polishing were performed. Subsequently, all specimens underwent CTC (10,000 cycles). Color parameters, color difference (ΔE00), and translucency parameter (TP) were measured three times at baseline (t0), after debonding and polishing (t1), and after CTC (t2). Data were statistically analyzed (α = 0.05).

Results: Significant difference existed among the groups regarding ΔE00t0t2 (p < 0.001). The APA group showed minimum (ΔE00 = 1.15 ± 0.53) and the control group showed maximum (ΔE00 = 0.19 ± 0.02) color stability, with no significant difference between the laser and CoJet groups (p = 0.511). The four groups were significantly different regarding ΔTPt0t2 (p < 0.001). Maximal increases in TP were noted in the CoJet (1.00 ± 0.18) and APA (1.04 ± 0.38) groups while minimal increase was recorded in the control group (0.1 ± 0.02).

Conclusions: Orthodontic treatment makes zirconia restorations susceptible to discoloration and increased translucency. Nonetheless, the recorded ΔE00 and ΔTP did not exceed the acceptability threshold.

目的:评价不同表面处理和咖啡热循环(CTC)对正畸粘接后全立方稳定氧化锆(FSZ)的颜色稳定性和半透明性。方法:采用120只盘状FSZ标本进行体外实验。选取30个标本作为对照组,保持原状。剩余样品根据表面处理方式随机分为3组(n = 30):空气颗粒磨损(APA)、二氧化硅涂层(CoJet)和二氧化碳(CO2)激光。试验组金属支架粘接后,进行去粘接和抛光。随后,所有标本都进行了CTC(10,000次循环)。颜色参数、色差(ΔE00)和半透明参数(TP)分别在基线(t0)、去粘接抛光后(t1)和CTC后(t2)测量三次。对数据进行统计学分析(α = 0.05)。结果:ΔE00t0t2组间差异有统计学意义(p < 0.001)。APA组颜色稳定性最低(ΔE00 = 1.15±0.53),对照组颜色稳定性最高(ΔE00 = 0.19±0.02),激光组与CoJet组无显著差异(p = 0.511)。四组在ΔTPt0t2上有显著差异(p < 0.001)。CoJet组TP升高幅度最大(1.00±0.18),APA组TP升高幅度最大(1.04±0.38),而对照组TP升高幅度最小(0.1±0.02)。结论:正畸治疗使氧化锆修复体易变色,透明度增加。尽管如此,记录的ΔE00和ΔTP并没有超过可接受的阈值。
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引用次数: 1
READER'S FORUM. 读者的论坛。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25 DOI: 10.4041/kjod.53.0001RF
Haeddeuri Kim
A1. We followed the protocol in the article published in 2009. We used NFZ plane as cranial base reference plane. The NFZ plane was formed by nasion (N) and two frontozygomatic (FZ) points. The Cartesian coordinate value of N point registered as the origin were adjusted based on (0, 0, 0). First, the z-coordinates of both FZ points was set symmetrically in the frontal plane. Second, the y-coordinates of FZ points on the axial plane was adjusted symmetrically. Finally, we manipulated the z-coordinates of left temporal-fossa points and orbitale as close as possible. Figures 1–3 from the article by Dr. Cho was very helpful for this reorientation procedure.
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引用次数: 0
Does surgically assisted maxillary protraction with skeletal anchorage and Class III elastics affect the pharyngeal airway? A retrospective, long-term study. 手术辅助上颌牵引骨锚和III类弹性是否影响咽气道?一项回顾性的长期研究。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25 DOI: 10.4041/kjod22.117
Elvan Onem Ozbilen, Petros Papaefthymiou, Hanife Nuray Yilmaz, Nazan Küçükkeleş

Objective: Surgically assisted maxillary protraction is an alternative protocol in severe Class III cases or after the adolescent growth spurt involving increased maxillary advancement. Correction of the maxillary deficiency has been suggested to improve pharyngeal airway dimensions. Therefore, this retrospective study aimed to analyze the airway changes cephalometrically following surgically assisted maxillary protraction with skeletal anchorage and Class III elastics.

Methods: The study population consisted of 15 Class III patients treated with surgically assisted maxillary protraction combined with skeletal anchorage and Class III elastics (mean age: 12.9 ± 1.2 years). Growth changes were initially assessed for a mean of 5.5 ± 1.6 months prior to treatment. Airway and skeletal changes in the control (T0), pre-protraction (T1), post-protraction (T2), and follow-up (T3) periods were monitored and compared using lateral cephalometric radiographs. Statistical significance was set at p < 0.05.

Results: The skeletal or airway parameters showed no statistically significant changes during the control period. Sella to nasion angle, N perpendicular to A, Point A to Point B angle, and Frankfort plane to mandibular plane angle increased significantly during the maxillary protraction period (p < 0.05), but no significant changes were observed in airway parameters (p > 0.05). No statistically significant changes were observed in the airway parameters in the follow-up period either. However, Sella to Gonion distance increased significantly (p < 0.05) during the follow-up period.

Conclusions: No significant changes in pharyngeal airway parameters were found during the control, maxillary protraction, and follow-up periods. Moreover, the significant increases in the skeletal parameters during maxillary protraction were maintained in the long-term.

目的:手术辅助上颌前伸是严重III类病例或青少年生长突增后上颌前伸的替代方案。矫正上颌缺陷已被建议改善咽气道的尺寸。因此,本回顾性研究旨在分析手术辅助上颌前伸使用骨锚和III类弹性物后的气道改变。方法:研究人群包括15例手术辅助上颌牵引联合骨锚和III类弹性治疗的III类患者(平均年龄:12.9±1.2岁)。在治疗前平均5.5±1.6个月对生长变化进行初步评估。通过侧位头颅x线片监测和比较对照组(T0)、牵引前(T1)、牵引后(T2)和随访(T3)期间的气道和骨骼变化。p < 0.05为差异有统计学意义。结果:对照组患者的骨骼和气道参数无明显变化。上颌牵伸期鞍鼻角、N垂直于A点角、A点到B点角、法兰克福平面到下颌平面角显著增加(p < 0.05),气道参数无显著变化(p > 0.05)。随访期间气道参数无统计学意义变化。随着随访时间的延长,鞍到阴的距离显著增加(p < 0.05)。结论:在对照组、上颌前伸和随访期间,咽气道参数均无明显变化。此外,上颌前伸过程中骨骼参数的显著增加在长期内保持不变。
{"title":"Does surgically assisted maxillary protraction with skeletal anchorage and Class III elastics affect the pharyngeal airway? A retrospective, long-term study.","authors":"Elvan Onem Ozbilen,&nbsp;Petros Papaefthymiou,&nbsp;Hanife Nuray Yilmaz,&nbsp;Nazan Küçükkeleş","doi":"10.4041/kjod22.117","DOIUrl":"https://doi.org/10.4041/kjod22.117","url":null,"abstract":"<p><strong>Objective: </strong>Surgically assisted maxillary protraction is an alternative protocol in severe Class III cases or after the adolescent growth spurt involving increased maxillary advancement. Correction of the maxillary deficiency has been suggested to improve pharyngeal airway dimensions. Therefore, this retrospective study aimed to analyze the airway changes cephalometrically following surgically assisted maxillary protraction with skeletal anchorage and Class III elastics.</p><p><strong>Methods: </strong>The study population consisted of 15 Class III patients treated with surgically assisted maxillary protraction combined with skeletal anchorage and Class III elastics (mean age: 12.9 ± 1.2 years). Growth changes were initially assessed for a mean of 5.5 ± 1.6 months prior to treatment. Airway and skeletal changes in the control (T0), pre-protraction (T1), post-protraction (T2), and follow-up (T3) periods were monitored and compared using lateral cephalometric radiographs. Statistical significance was set at <i>p</i> < 0.05.</p><p><strong>Results: </strong>The skeletal or airway parameters showed no statistically significant changes during the control period. Sella to nasion angle, N perpendicular to A, Point A to Point B angle, and Frankfort plane to mandibular plane angle increased significantly during the maxillary protraction period (<i>p</i> < 0.05), but no significant changes were observed in airway parameters (<i>p</i> > 0.05). No statistically significant changes were observed in the airway parameters in the follow-up period either. However, Sella to Gonion distance increased significantly (<i>p</i> < 0.05) during the follow-up period.</p><p><strong>Conclusions: </strong>No significant changes in pharyngeal airway parameters were found during the control, maxillary protraction, and follow-up periods. Moreover, the significant increases in the skeletal parameters during maxillary protraction were maintained in the long-term.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 1","pages":"35-44"},"PeriodicalIF":1.9,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/09/39/kjod-53-1-35.PMC9877364.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9207966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Consideration of root position in virtual tooth setup for extraction treatment: A comparative study of simulated and actual treatment results. 在拔牙治疗中考虑牙根位置:模拟与实际治疗结果的比较研究。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25 DOI: 10.4041/kjod22.105
Mirinae Park, Veerasathpurush Allareddy, Phimon Atsawasuwan, Min Kyeong Lee, Kyungmin Clara Lee

Objective: The purpose of the present study was to compare the root positions in virtual tooth setups using only crowns in a simulated treatment with those achieved in the actual treatment.

Methods: Pre- and post-treatment intraoral and corresponding cone beam computed tomography (CBCT) scans were obtained from 15 patients who underwent orthodontic treatment with premolar extraction. A conventional virtual tooth setup was used for the treatment simulation. Pre- and post-treatment three-dimensional digital tooth models were fabricated by integrating the patients' intraoral and CBCT scans. The simulated root positions in the virtual setup were obtained by merging the crown in the virtual setup and root in the pre-treatment tooth model. The root positions of the simulated and actual post-treatment tooth models were compared.

Results: Differences in root positions between the simulated and actual models were > 1 mm in all teeth, and statistically significant differences were observed (p < 0.05), except for the maxillary lateral incisors. The differences in the inter-root angulation were > 1° in all teeth, and statistically significant differences were observed in the maxillary and mandibular canines.

Conclusions: The virtual tooth setup using only crown data showed errors over the clinical limits. The clinical application of a virtual setup using crowns and roots is necessary for accurate and precise treatment simulation, particularly in extraction treatment.

目的:本研究的目的是比较在模拟治疗中仅使用冠的虚拟牙齿装置与在实际治疗中获得的牙根位置。方法:对15例接受前磨牙拔牙正畸治疗的患者进行治疗前后的口腔内及相应的锥形束计算机断层扫描(CBCT)。采用传统的虚拟牙装置进行治疗模拟。结合患者的口腔内扫描和CBCT扫描,制作治疗前后三维数字牙齿模型。通过合并虚拟牙架中的牙冠和治疗前牙模型中的牙根,得到虚拟牙架中的模拟牙根位置。将模拟牙模型与实际牙模型的牙根位置进行比较。结果:除上颌侧切牙外,模拟模型与实际模型牙根位置差异均> 1 mm,差异均有统计学意义(p < 0.05)。所有牙的根间角度差异均大于1°,其中上颌和下颌牙的差异有统计学意义。结论:仅使用牙冠数据的虚拟牙设置存在超过临床限制的误差。使用牙冠和牙根的虚拟装置的临床应用对于准确和精确的治疗模拟是必要的,特别是在拔牙治疗中。
{"title":"Consideration of root position in virtual tooth setup for extraction treatment: A comparative study of simulated and actual treatment results.","authors":"Mirinae Park,&nbsp;Veerasathpurush Allareddy,&nbsp;Phimon Atsawasuwan,&nbsp;Min Kyeong Lee,&nbsp;Kyungmin Clara Lee","doi":"10.4041/kjod22.105","DOIUrl":"https://doi.org/10.4041/kjod22.105","url":null,"abstract":"<p><strong>Objective: </strong>The purpose of the present study was to compare the root positions in virtual tooth setups using only crowns in a simulated treatment with those achieved in the actual treatment.</p><p><strong>Methods: </strong>Pre- and post-treatment intraoral and corresponding cone beam computed tomography (CBCT) scans were obtained from 15 patients who underwent orthodontic treatment with premolar extraction. A conventional virtual tooth setup was used for the treatment simulation. Pre- and post-treatment three-dimensional digital tooth models were fabricated by integrating the patients' intraoral and CBCT scans. The simulated root positions in the virtual setup were obtained by merging the crown in the virtual setup and root in the pre-treatment tooth model. The root positions of the simulated and actual post-treatment tooth models were compared.</p><p><strong>Results: </strong>Differences in root positions between the simulated and actual models were > 1 mm in all teeth, and statistically significant differences were observed (<i>p</i> < 0.05), except for the maxillary lateral incisors. The differences in the inter-root angulation were > 1° in all teeth, and statistically significant differences were observed in the maxillary and mandibular canines.</p><p><strong>Conclusions: </strong>The virtual tooth setup using only crown data showed errors over the clinical limits. The clinical application of a virtual setup using crowns and roots is necessary for accurate and precise treatment simulation, particularly in extraction treatment.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 1","pages":"26-34"},"PeriodicalIF":1.9,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/e1/49/kjod-53-1-26.PMC9877363.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9193764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Correction of late adolescent skeletal Class III using the Alt-RAMEC protocol and skeletal anchorage. 使用Alt-RAMEC方案和骨骼锚固矫治晚期青少年骨骼III类。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25 DOI: 10.4041/kjod21.337
Muhammed Hilmi Büyükçavuş, Ömer Faruk Sari, Yavuz Findik

This case report describes skeletal anchorage-supported maxillary protraction performed with the Alternate Rapid Maxillary Expansion and Constriction (Alt-RAMEC) protocol over a treatment duration of 14 months in a 16-year-old female patient who was in the late growth-development period. Miniplates were applied to the patient's aperture piriformis area to apply force from the protraction appliance. After 9 weeks of following the Alt-RAMEC protocol, miniplates were used to transfer a unilateral 500-g protraction force to a Petit-type face mask. A significant improvement was observed in the soft tissue profile in measurements made both cephalometrically and in three dimensional photographs. Subsequently, the second phase of fixed orthodontic treatment was started and the treatment was completed with the retention phase. Following treatment completion, occlusion, smile esthetics, and soft tissue profile improved significantly in response to orthopedic and orthodontic treatment.

本病例报告描述了一名16岁晚期生长发育的女性患者,采用上颌快速扩张和收缩交替(Alt-RAMEC)方案,在14个月的治疗期间,采用骨锚支架支持的上颌牵引。将微型钢板应用于患者梨状肌孔区域,以施加牵引器产生的力。按照Alt-RAMEC方案治疗9周后,使用微型钢板将单边500g拉力转移到petit型口罩上。在头部测量和三维照片中观察到软组织轮廓的显着改善。随后,开始第二阶段固定正畸治疗,并以固位期结束治疗。治疗完成后,矫形和正畸治疗对咬合、微笑美观和软组织轮廓有显著改善。
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引用次数: 0
Evaluation of the cell viability and antimicrobial effects of orthodontic bands coated with silver or zinc oxide nanoparticles: An in vitro study. 氧化银或氧化锌纳米颗粒涂层正畸带的细胞活力和抗菌效果的评估:一项体外研究。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25 DOI: 10.4041/kjod22.091
Rashin Bahrami, Maryam Pourhajibagher, Alireza Badiei, Reza Masaeli, Behrad Tanbakuchi

Objective: We aimed to evaluate the cell viability and antimicrobial effects of orthodontic bands coated with silver or zinc oxide nanoparticles (nano-Ag and nano-ZnO, respectively).

Methods: In this experimental study, 30 orthodontic bands were divided into three groups (n = 10 each): control (uncoated band), Ag (silver-coated band), and ZnO (zinc oxide-coated band). The electrostatic spray-assisted vapor deposition method was used to coat orthodontic bands with nano-Ag or nano-ZnO. The biofilm inhibition test was used to assess the antimicrobial effectiveness of nano-Ag and nano-ZnO against Streptococcus mutans, Lactobacillus acidophilus, and Candida albicans. Biocompatibility tests were conducted using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay. The groups were compared using oneway analysis of variance with a post-hoc test.

Results: The Ag group showed a significantly higher reduction in the number of L. acidophilus, C. albicans, and S. mutans colonies than the ZnO group (p = 0.015, 0.003, and 0.005, respectively). Compared with the control group, the Ag group showed a 2-log10 reduction in all the microorganisms' replication ability, but only S. mutants showed a 2-log10 reduction in replication ability in the ZnO group. The lowest mean cell viability was observed in the Ag group, but the difference between the groups was insignificant (p > 0.05).

Conclusions: Coating orthodontic bands with nano-ZnO or nano-Ag induced antimicrobial effects against oral pathogens. Among the nanoparticles, nano-Ag showed the best antimicrobial activity and nano-ZnO showed the highest biocompatibility.

目的:研究纳米银和纳米氧化锌(分别为纳米银和纳米氧化锌)涂层正畸带的细胞活力和抗菌效果。方法:将30根正畸带分为3组(n = 10): control(未涂覆带)、Ag(镀银带)和ZnO(氧化锌涂覆带)。采用静电喷雾辅助气相沉积法在正畸带表面涂覆纳米银或纳米zno。采用生物膜抑制试验考察纳米银和纳米zno对变形链球菌、嗜酸乳杆菌和白色念珠菌的抑菌效果。采用3-(4,5 -二甲基噻唑-2-基)- 2,5 -二苯基溴化四唑测定法进行生物相容性试验。采用单因素方差分析和事后检验对两组进行比较。结果:Ag组对嗜酸乳杆菌、白色念珠菌和变形链球菌菌落数量的减少显著高于ZnO组(p分别为0.015、0.003和0.005)。与对照组相比,Ag组所有微生物的复制能力都降低了2-log10,而ZnO组只有s突变体的复制能力降低了2-log10。Ag组平均细胞活力最低,但各组间差异不显著(p > 0.05)。结论:纳米氧化锌或纳米银涂层正畸带对口腔病原菌具有抗菌作用。其中,纳米银的抗菌活性最好,纳米zno的生物相容性最好。
{"title":"Evaluation of the cell viability and antimicrobial effects of orthodontic bands coated with silver or zinc oxide nanoparticles: An <i>in vitro</i> study.","authors":"Rashin Bahrami,&nbsp;Maryam Pourhajibagher,&nbsp;Alireza Badiei,&nbsp;Reza Masaeli,&nbsp;Behrad Tanbakuchi","doi":"10.4041/kjod22.091","DOIUrl":"https://doi.org/10.4041/kjod22.091","url":null,"abstract":"<p><strong>Objective: </strong>We aimed to evaluate the cell viability and antimicrobial effects of orthodontic bands coated with silver or zinc oxide nanoparticles (nano-Ag and nano-ZnO, respectively).</p><p><strong>Methods: </strong>In this experimental study, 30 orthodontic bands were divided into three groups (n = 10 each): control (uncoated band), Ag (silver-coated band), and ZnO (zinc oxide-coated band). The electrostatic spray-assisted vapor deposition method was used to coat orthodontic bands with nano-Ag or nano-ZnO. The biofilm inhibition test was used to assess the antimicrobial effectiveness of nano-Ag and nano-ZnO against <i>Streptococcus mutans</i>, <i>Lactobacillus acidophilus</i>, and <i>Candida albicans</i>. Biocompatibility tests were conducted using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay. The groups were compared using oneway analysis of variance with a post-hoc test.</p><p><strong>Results: </strong>The Ag group showed a significantly higher reduction in the number of <i>L. acidophilus</i>, <i>C. albicans</i>, and <i>S. mutans</i> colonies than the ZnO group (<i>p</i> = 0.015, 0.003, and 0.005, respectively). Compared with the control group, the Ag group showed a 2-log<sub>10</sub> reduction in all the microorganisms' replication ability, but only <i>S. mutants</i> showed a 2-log<sub>10</sub> reduction in replication ability in the ZnO group. The lowest mean cell viability was observed in the Ag group, but the difference between the groups was insignificant (<i>p</i> > 0.05).</p><p><strong>Conclusions: </strong>Coating orthodontic bands with nano-ZnO or nano-Ag induced antimicrobial effects against oral pathogens. Among the nanoparticles, nano-Ag showed the best antimicrobial activity and nano-ZnO showed the highest biocompatibility.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 1","pages":"16-25"},"PeriodicalIF":1.9,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/5b/9a/kjod-53-1-16.PMC9877365.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9193757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
LIST OF REVIEWERS IN 2022. 2022年审稿人名单。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25
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引用次数: 0
Comparative evaluation of shear bond strength of orthodontic brackets bonded to three-dimensionally-printed and milled materials after surface treatment and artificial aging. 表面处理与人工老化后正畸托槽与三维打印、研磨材料粘接剪切强度的比较评价
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-01-25 DOI: 10.4041/kjod22.098
Ameer Biadsee, Ofir Rosner, Carol Khalil, Vanina Atanasova, Joel Blushtein, Shifra Levartovsky

Objective: This study aimed to evaluate the shear bond strength (SBS) of orthodontic brackets bonded to three-dimensionally (3D)-printed materials after various surface treatments and artificial aging compared with that bonded to computer-aided design/computer-aided manufacturing (CAD-CAM) polymethyl methacrylate (PMMA)-milled materials.

Methods: Eighty cylindrical specimens were 3D printed and divided into the following four subgroups (n = 20 each) according to the surface treatment and artificial aging procedure. Group A, sandblasted with 50 μm aluminum oxide particles (SA) and aging; group B, sandblasted with 30 μm silica-coated alumina particles (CO) and aging; group C, SA without aging; and group D, CO without aging. For the control group, 20 CAD-CAM PMMA-milled cylindrical specimens were sandblasted with SA and aged. The SBS was measured using a universal testing machine (0.25 mm/min), examined at ×2.5 magnification for failure mode classification, and statistically analyzed (p = 0.05).

Results: The retention obtained with the 3D-printed materials (groups A-D) was higher than that obtained with the PMMA-milled materials (control group). However, no significant difference was found between the study and control groups, except for group C (SA without aging), which showed significantly higher retention than the control group (PMMA-SA and thermocycling) (p = 0.037). Study groups A-D predominantly exhibited a cohesive specimen mode, indicating specimen fracture.

Conclusions: Orthodontic brackets bonded to 3D-printed materials exhibit acceptable bonding strengths. However, 3D-printed materials are prone to cohesive failure, which may result in crown fractures.

目的:比较三维(3D)打印材料与计算机辅助设计/计算机辅助制造(CAD-CAM)聚甲基丙烯酸甲酯(PMMA)研磨材料在不同表面处理和人工老化后的正畸托槽剪切结合强度(SBS)。方法:对80个圆柱形试样进行3D打印,并根据表面处理和人工时效方式分为4个亚组(n = 20)。A组,喷砂50 μm氧化铝颗粒(SA)并时效处理;B组,喷砂处理30 μm二氧化硅包覆氧化铝颗粒(CO)并时效处理;C组为SA,未衰老;D组为未衰老的CO。作为对照组,20个CAD-CAM pmma铣削的圆柱形试样用SA喷砂并老化。SBS采用通用试验机(0.25 mm/min)测量,在×2.5放大下检查失效模式分类,并进行统计学分析(p = 0.05)。结果:3d打印材料(A-D组)获得的保留率高于pmma研磨材料(对照组)获得的保留率。然而,除了C组(未老化的SA)的保留率显著高于对照组(PMMA-SA和热循环)(p = 0.037)外,研究组与对照组之间无显著差异。实验组a - d主要表现为黏结试样模式,表明试样断裂。结论:与3d打印材料结合的正畸托槽具有可接受的结合强度。然而,3d打印材料容易发生内聚失效,可能导致冠状断裂。
{"title":"Comparative evaluation of shear bond strength of orthodontic brackets bonded to three-dimensionally-printed and milled materials after surface treatment and artificial aging.","authors":"Ameer Biadsee,&nbsp;Ofir Rosner,&nbsp;Carol Khalil,&nbsp;Vanina Atanasova,&nbsp;Joel Blushtein,&nbsp;Shifra Levartovsky","doi":"10.4041/kjod22.098","DOIUrl":"https://doi.org/10.4041/kjod22.098","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to evaluate the shear bond strength (SBS) of orthodontic brackets bonded to three-dimensionally (3D)-printed materials after various surface treatments and artificial aging compared with that bonded to computer-aided design/computer-aided manufacturing (CAD-CAM) polymethyl methacrylate (PMMA)-milled materials.</p><p><strong>Methods: </strong>Eighty cylindrical specimens were 3D printed and divided into the following four subgroups (n = 20 each) according to the surface treatment and artificial aging procedure. Group A, sandblasted with 50 μm aluminum oxide particles (SA) and aging; group B, sandblasted with 30 μm silica-coated alumina particles (CO) and aging; group C, SA without aging; and group D, CO without aging. For the control group, 20 CAD-CAM PMMA-milled cylindrical specimens were sandblasted with SA and aged. The SBS was measured using a universal testing machine (0.25 mm/min), examined at ×2.5 magnification for failure mode classification, and statistically analyzed (<i>p</i> = 0.05).</p><p><strong>Results: </strong>The retention obtained with the 3D-printed materials (groups A-D) was higher than that obtained with the PMMA-milled materials (control group). However, no significant difference was found between the study and control groups, except for group C (SA without aging), which showed significantly higher retention than the control group (PMMA-SA and thermocycling) (<i>p</i> = 0.037). Study groups A-D predominantly exhibited a cohesive specimen mode, indicating specimen fracture.</p><p><strong>Conclusions: </strong>Orthodontic brackets bonded to 3D-printed materials exhibit acceptable bonding strengths. However, 3D-printed materials are prone to cohesive failure, which may result in crown fractures.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 1","pages":"45-53"},"PeriodicalIF":1.9,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/f1/13/kjod-53-1-45.PMC9877367.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9207434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
期刊
Korean Journal of Orthodontics
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