Accuracy and user experience of dental diagnosis for a patient with cleidocranial dysplasia (CCD) using immersive virtual reality (VR) and cone-beam computed tomography multiplanar reconstruction methods were evaluated.
Methods
Dental students (n = 40) were randomly assigned to VR or MP groups. VR participants manipulated and visualized the rendered 3-dimensional model using VR hardware and software. The MP participants viewed cone-beam computed tomography slices using orthogonal planes and 3-dimensional rendered images on a computer. Participants identified erupted and unerupted primary, permanent, and supernumerary teeth in a patient with CCD and completed presurvey, postsurvey, Presence, and NASA Task Load Index questionnaires.
Results
The VR group was significantly more accurate in identifying supernumerary teeth (P <0.008), developing permanent teeth (P <0.020), and primary teeth (P <0.05) in the maxillary anterior region than the MP group. There was more variability in the accuracy of tooth identification for the MP participants (P = 0.005). The Presence Questionnaire showed that participants from the VR group had significantly greater feelings of control and sensory factors during the task (P <0.05). The NASA Task Load Index showed that the MP group participants worked harder and required more mental demands to accomplish the same task (P <0.001).
Conclusions
This study showed that for novice clinicians, the VR method might offer a more accurate method of dental diagnosis of a patient with CCD who presents with retained primary teeth, multiple impacted, and supernumerary teeth. In addition, the VR participants showed increased engagement and a sense of presence.
{"title":"Accuracy and user experience of dental diagnosis of a patient with cleidocranial dysplasia using immersive virtual reality and cone-beam computed tomography multiplanar reconstructions","authors":"Hera Kim-Berman , Jacob Herremans , Brandon Bonine , Sharon Aronovich , Vidya Ramaswamy","doi":"10.1016/j.ajodo.2024.08.008","DOIUrl":"10.1016/j.ajodo.2024.08.008","url":null,"abstract":"<div><h3>Introduction</h3><div>Accuracy and user experience of dental diagnosis for a patient with cleidocranial dysplasia (CCD) using immersive virtual reality (VR) and cone-beam computed tomography multiplanar reconstruction methods were evaluated.</div></div><div><h3>Methods</h3><div>Dental students (n = 40) were randomly assigned to VR or MP groups. VR participants manipulated and visualized the rendered 3-dimensional model using VR hardware and software. The MP participants viewed cone-beam computed tomography slices using orthogonal planes and 3-dimensional rendered images on a computer. Participants identified erupted and unerupted primary, permanent, and supernumerary teeth in a patient with CCD and completed presurvey, postsurvey, Presence, and NASA Task Load Index questionnaires.</div></div><div><h3>Results</h3><div>The VR group was significantly more accurate in identifying supernumerary teeth (<em>P</em> <0.008), developing permanent teeth (<em>P</em> <0.020), and primary teeth (<em>P</em> <0.05) in the maxillary anterior region than the MP group. There was more variability in the accuracy of tooth identification for the MP participants (<em>P</em> = 0.005). The Presence Questionnaire showed that participants from the VR group had significantly greater feelings of control and sensory factors during the task (<em>P</em> <0.05). The NASA Task Load Index showed that the MP group participants worked harder and required more mental demands to accomplish the same task (<em>P</em> <0.001).</div></div><div><h3>Conclusions</h3><div>This study showed that for novice clinicians, the VR method might offer a more accurate method of dental diagnosis of a patient with CCD who presents with retained primary teeth, multiple impacted, and supernumerary teeth. In addition, the VR participants showed increased engagement and a sense of presence.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 1","pages":"Pages 110-122"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.ajodo.2024.10.001
Peter M. Greco
{"title":"Dr I. N. Ternet and you","authors":"Peter M. Greco","doi":"10.1016/j.ajodo.2024.10.001","DOIUrl":"10.1016/j.ajodo.2024.10.001","url":null,"abstract":"","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 1","pages":"Pages 1-2"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.ajodo.2024.10.005
Jae Hyun Park, Roberto Hernandez-Orsini, Paul Emile Rossouw, Anthony M. Puntillo, Daniel J. Rejman, Meenakshi Vishwanath, Onur Kadioglu, Timothy Tremont, Timothy S. Trulove
This article outlines the development process for the scenario-based clinical examination of the American Board of Orthodontics (ABO). It emphasizes the importance of gaining hands-on experience with patients and critically analyzing the facts when formulating sound clinical judgments. These exercises enhance critical thinking skills, allowing for self-assessment and reflection on patient outcomes. In addition, the ABO now offers both virtual and live presentations through “The Pathway Program” to further support examination preparation. For more information, please visit the ABO’s official Web site at AmericanBoardOrtho.com.
{"title":"The American Board of Orthodontics: Scenario-based clinical examination development and preparation","authors":"Jae Hyun Park, Roberto Hernandez-Orsini, Paul Emile Rossouw, Anthony M. Puntillo, Daniel J. Rejman, Meenakshi Vishwanath, Onur Kadioglu, Timothy Tremont, Timothy S. Trulove","doi":"10.1016/j.ajodo.2024.10.005","DOIUrl":"10.1016/j.ajodo.2024.10.005","url":null,"abstract":"<div><div>This article outlines the development process for the scenario-based clinical examination of the American Board of Orthodontics (ABO). It emphasizes the importance of gaining hands-on experience with patients and critically analyzing the facts when formulating sound clinical judgments. These exercises enhance critical thinking skills, allowing for self-assessment and reflection on patient outcomes. In addition, the ABO now offers both virtual and live presentations through “The Pathway Program” to further support examination preparation. For more information, please visit the ABO’s official Web site at <span><span>AmericanBoardOrtho.com</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 1","pages":"Pages 7-16"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.ajodo.2024.08.014
Jason Scheibel , Christian Schwahn , Maria Mksoud , Torsten Mundt , Olaf Bernhardt , Stavros Kiliaridis , Thomas Kocher , Reiner Biffar , Markus Krüger , Amro Daboul
Introduction
This study aimed to (1) examine the cross-sectional area (CSA) of the masseter muscle in relation to bruxism and (2) investigate if there are gender-related differences in the masseter muscle in a population-based magnetic resonance imaging (MRI) study.
Methods
The study included 720 subjects aged 30-89 years (391 women and 329 men) from the Study of Health in Pomerania, a cross-sectional population-based study assessing the prevalence and incidence of common population-relevant diseases and their risk factors in Northeastern Germany. The participants underwent both a whole-body MRI and a full oral examination. The CSAs of the masseter muscles on both sides were measured from MRI images. The presence or absence of awake and/or sleep grinding and clenching, unilateral chewing, and other parafunctional activities were obtained from the dental interview. Linear and ordinal logistic regression models were used to examine the associations between the CSAs of the masseter, bruxism, and gender.
Results
The frequency of bruxism and reports of muscle or joint pain were significantly higher in women. The analysis revealed that a larger masseter CSA was significantly associated with bruxism only in men. The larger CSA was manifested only in the higher frequency bruxers.
Conclusions
Bruxism had heterogeneous effects on the masseter muscle between genders. Although a higher prevalence of bruxism was reported by women, the larger CSA of the masseter muscle was significantly higher in bruxing men but not in women. This study emphasizes the need for a gender-specific approach when evaluating the clinical implications of bruxism on the masseter muscle.
简介本研究的目的是：(1) 检查与磨牙症有关的颌下肌横截面积 (CSA)；(2) 在一项基于人群的磁共振成像 (MRI) 研究中调查颌下肌是否存在与性别有关的差异：研究对象包括波美拉尼亚健康研究（Study of Health in Pomerania）中年龄在 30-89 岁的 720 名受试者（391 名女性和 329 名男性），该研究是一项以人群为基础的横断面研究，旨在评估德国东北部常见疾病及其风险因素的流行率和发病率。参与者同时接受了全身核磁共振成像和全面口腔检查。根据核磁共振图像测量了两侧咀嚼肌的CSA。是否存在清醒和/或睡眠时磨牙和咬牙、单侧咀嚼以及其他辅助功能活动则通过牙科访谈获得。研究人员使用线性和顺序逻辑回归模型来检验咀嚼肌CSA、磨牙症和性别之间的关联：结果：女性磨牙症和肌肉或关节疼痛的发生率明显更高。分析表明，只有男性的颌间肌CSA较大，才与磨牙症有明显关系。较大的CSA仅在磨牙频率较高的人群中表现出来：结论：磨牙对不同性别的咀嚼肌有不同的影响。尽管女性的磨牙症发生率较高，但磨牙男性的颌下肌CSA明显高于女性。这项研究强调，在评估磨牙症对咀嚼肌的临床影响时，有必要采用针对不同性别的方法。
{"title":"Influence of gender and bruxism on the masseter muscle: A population-based magnetic resonance imaging study","authors":"Jason Scheibel , Christian Schwahn , Maria Mksoud , Torsten Mundt , Olaf Bernhardt , Stavros Kiliaridis , Thomas Kocher , Reiner Biffar , Markus Krüger , Amro Daboul","doi":"10.1016/j.ajodo.2024.08.014","DOIUrl":"10.1016/j.ajodo.2024.08.014","url":null,"abstract":"<div><h3>Introduction</h3><div>This study aimed to (1) examine the cross-sectional area (CSA) of the masseter muscle in relation to bruxism and (2) investigate if there are gender-related differences in the masseter muscle in a population-based magnetic resonance imaging (MRI) study.</div></div><div><h3>Methods</h3><div>The study included 720 subjects aged 30-89 years (391 women and 329 men) from the Study of Health in Pomerania, a cross-sectional population-based study assessing the prevalence and incidence of common population-relevant diseases and their risk factors in Northeastern Germany. The participants underwent both a whole-body MRI and a full oral examination. The CSAs of the masseter muscles on both sides were measured from MRI images. The presence or absence of awake and/or sleep grinding and clenching, unilateral chewing, and other parafunctional activities were obtained from the dental interview. Linear and ordinal logistic regression models were used to examine the associations between the CSAs of the masseter, bruxism, and gender.</div></div><div><h3>Results</h3><div>The frequency of bruxism and reports of muscle or joint pain were significantly higher in women. The analysis revealed that a larger masseter CSA was significantly associated with bruxism only in men. The larger CSA was manifested only in the higher frequency bruxers.</div></div><div><h3>Conclusions</h3><div>Bruxism had heterogeneous effects on the masseter muscle between genders. Although a higher prevalence of bruxism was reported by women, the larger CSA of the masseter muscle was significantly higher in bruxing men but not in women. This study emphasizes the need for a gender-specific approach when evaluating the clinical implications of bruxism on the masseter muscle.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 1","pages":"Pages 80-88"},"PeriodicalIF":2.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142512416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-30DOI: 10.1016/j.ajodo.2024.10.017
Daniel Lo-Cao , Nikolaos Pandis , M. Ali Darendeliler , Alexandra K. Papadopoulou
Introduction
The dentoskeletal effects of clear aligner treatment (CAT) with Invisalign vs temporary skeletal anchorage device-anchored Sydney intrusion spring (SIS) were compared in consecutively treated growing patients with anterior open bite using cone-beam computed tomography scans.
Methods
Fifteen adolescents treated exclusively with Invisalign, and 14 with SIS (first-phase treatment) were assessed retrospectively. Rigid-wise, voxel-based registration of pretreatment and posttreatment cone-beam computed tomography scans were performed using the anterior cranial base, maxillary plane, and mandibular body as reference regions. Treatment outcomes were compared between groups using median regression modeling.
Results
Molar intrusion and incisor extrusion (millimeters), as well as buccolingual inclination changes (°), were not expressed as prescribed in the ClinChecks for Invisalign. Both treatment modalities resulted in similar improvement of anterior open bite; however, via different mechanics. Compared with CAT, SIS demonstrated significantly greater intrusion of the maxillary first molars when measured from the mesiobuccal (16: 2.09 mm [95% confidence interval {CI}, 1.05-3.12]; 26: 2.98 mm [95% CI, 2.00-3.96]) and palatal cusps (16: 2.08 mm [95% CI, 1.15-3.01], 26: 2.83 mm [95% CI, 1.92-3.74]) and less extrusion of the maxillary incisors (12: −1.30 mm [95% CI, −2.13 to −0.47], 11: −1.30 mm [95% CI, −2.40 to −0.20], 21: −0.92 mm [95% CI, −1.73 to −0.12], 22: −0.85 mm [95% CI, −1.71 to −0.00]). There was weak evidence of association with less extrusion of the mandibular incisors using SIS. Maxillary and mandibular incisors tipped lingually in both groups with no statistical difference across groups.
Conclusions
SIS demonstrated greater maxillary molar intrusion, whereas CAT was associated with incisor extrusion.
简介：在连续治疗的生长中的前牙开咬患者中，使用锥形束计算机断层扫描比较了使用Invisalign的透明矫正器治疗（CAT）与使用临时骨锚定装置锚定的悉尼侵入弹簧（SIS）的牙骨骼效果。方法：回顾性分析15例单纯使用Invisalign治疗的青少年和14例使用SIS（一期治疗）的青少年。采用前颅底、上颌平面和下颌骨体作为参考区域，对预处理和后处理锥形束计算机断层扫描进行刚体、体素配准。采用中位数回归模型比较两组治疗结果。结果：磨牙侵入和切牙挤压（毫米）以及颊舌倾斜变化（°）未按ClinChecks for Invisalign的规定表达。两种治疗方式对前牙开咬的改善效果相似；然而，通过不同的机制。与CAT相比，从中颊部测量时，SIS显示上颌第一磨牙的侵入性明显更大(16:2.09 mm[95%可信区间{CI}， 1.05-3.12]；26.98 mm [95% CI, 2.00-3.96])和腭尖（16.08 mm [95% CI, 1.15-3.01], 26.83 mm [95% CI, 1.92-3.74]）和上颌门牙较少挤压（12.1 -1.30 mm [95% CI, -2.13至-0.47],11.1 -1.30 mm [95% CI, -2.40至-0.20],21.2:-0.92 mm [95% CI, -1.73至-0.12],22.0:-0.85 mm [95% CI, -1.71至-0.00]）。有微弱的证据表明使用SIS与下颌门牙较少挤压有关。两组上、下颌切牙舌尖，组间差异无统计学意义。结论：SIS表现出更大的上颌磨牙侵入，而CAT则与门牙挤压有关。
{"title":"A 3-dimensional comparative assessment of the dentoskeletal effects of clear aligners vs temporary skeletal anchorage device-assisted posterior intrusion in adolescents with anterior open bite: A single-center, retrospective, cohort study","authors":"Daniel Lo-Cao , Nikolaos Pandis , M. Ali Darendeliler , Alexandra K. Papadopoulou","doi":"10.1016/j.ajodo.2024.10.017","DOIUrl":"10.1016/j.ajodo.2024.10.017","url":null,"abstract":"<div><h3>Introduction</h3><div>The dentoskeletal effects of clear aligner treatment (CAT) with Invisalign vs temporary skeletal anchorage device-anchored Sydney intrusion spring (SIS) were compared in consecutively treated growing patients with anterior open bite using cone-beam computed tomography scans.</div></div><div><h3>Methods</h3><div>Fifteen adolescents treated exclusively with Invisalign, and 14 with SIS (first-phase treatment) were assessed retrospectively. Rigid-wise, voxel-based registration of pretreatment and posttreatment cone-beam computed tomography scans were performed using the anterior cranial base, maxillary plane, and mandibular body as reference regions. Treatment outcomes were compared between groups using median regression modeling.</div></div><div><h3>Results</h3><div>Molar intrusion and incisor extrusion (millimeters), as well as buccolingual inclination changes (°), were not expressed as prescribed in the ClinChecks for Invisalign. Both treatment modalities resulted in similar improvement of anterior open bite; however, via different mechanics. Compared with CAT, SIS demonstrated significantly greater intrusion of the maxillary first molars when measured from the mesiobuccal (16: 2.09 mm [95% confidence interval {CI}, 1.05-3.12]; 26: 2.98 mm [95% CI, 2.00-3.96]) and palatal cusps (16: 2.08 mm [95% CI, 1.15-3.01], 26: 2.83 mm [95% CI, 1.92-3.74]) and less extrusion of the maxillary incisors (12: −1.30 mm [95% CI, −2.13 to −0.47], 11: −1.30 mm [95% CI, −2.40 to −0.20], 21: −0.92 mm [95% CI, −1.73 to −0.12], 22: −0.85 mm [95% CI, −1.71 to −0.00]). There was weak evidence of association with less extrusion of the mandibular incisors using SIS. Maxillary and mandibular incisors tipped lingually in both groups with no statistical difference across groups.</div></div><div><h3>Conclusions</h3><div>SIS demonstrated greater maxillary molar intrusion, whereas CAT was associated with incisor extrusion.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 3","pages":"Pages 345-361"},"PeriodicalIF":2.7,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142903958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-26DOI: 10.1016/j.ajodo.2024.11.005
Manish Sharma, Adeel Ahmed Bajjad, Amit Kumar Mendiratta, Seema Gupta, Kshitija J Patil, Shelly Saxena
Introduction: The primary objective of this study was to assess the 3-dimensional position of the mandibular canal (MC) in different craniofacial patterns to know about the safe placement of temporary skeletal anchorage devices using cone-beam computed tomography (CBCT). The secondary objectives were to assess sex differences and correlate the MC position with various factors.
Methods: This prospective, observational study was conducted on 90 patients, divided into 3 groups based on the sagittal pattern: skeletal Class I, Class II, and Class III. Similarly, based on the growth pattern of the patients, the sample was divided into 3 groups: horizontal, average, and vertical growth pattern. The skeletal and growth patterns were assessed using lateral cephalograms, and the position of the MC was assessed using CBCT. The position of the MC was assessed in 3 regions: the distal surface of the second molar (region 1), the interdental area between the first and second molars (region 2), and the interdental area between the first molar and second premolar (region 3). Data were subjected to statistical analysis.
Results: The statistically significant differences were noticed in the buccolingual position of MC in regions 2 and 3 in different skeletal patterns, whereas no statistically significant differences were noticed for the superoinferior position. In region 1, the MC was positioned closest to the alveolar crest among vertical growers. No statistically significant sex differences were observed between groups. A statistically significant positive correlation was observed between the buccolingual position of the MC and the skeletal pattern.
Conclusions: It is essential to know the 3-dimensional position of the MC in different craniofacial patterns using CBCT for safe placement of temporary skeletal anchorage devices.
{"title":"Three-dimensional assessment of mandibular canal in different sagittal and growth patterns for safe placement of temporary skeletal anchorage devices: A prospective study.","authors":"Manish Sharma, Adeel Ahmed Bajjad, Amit Kumar Mendiratta, Seema Gupta, Kshitija J Patil, Shelly Saxena","doi":"10.1016/j.ajodo.2024.11.005","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.11.005","url":null,"abstract":"<p><strong>Introduction: </strong>The primary objective of this study was to assess the 3-dimensional position of the mandibular canal (MC) in different craniofacial patterns to know about the safe placement of temporary skeletal anchorage devices using cone-beam computed tomography (CBCT). The secondary objectives were to assess sex differences and correlate the MC position with various factors.</p><p><strong>Methods: </strong>This prospective, observational study was conducted on 90 patients, divided into 3 groups based on the sagittal pattern: skeletal Class I, Class II, and Class III. Similarly, based on the growth pattern of the patients, the sample was divided into 3 groups: horizontal, average, and vertical growth pattern. The skeletal and growth patterns were assessed using lateral cephalograms, and the position of the MC was assessed using CBCT. The position of the MC was assessed in 3 regions: the distal surface of the second molar (region 1), the interdental area between the first and second molars (region 2), and the interdental area between the first molar and second premolar (region 3). Data were subjected to statistical analysis.</p><p><strong>Results: </strong>The statistically significant differences were noticed in the buccolingual position of MC in regions 2 and 3 in different skeletal patterns, whereas no statistically significant differences were noticed for the superoinferior position. In region 1, the MC was positioned closest to the alveolar crest among vertical growers. No statistically significant sex differences were observed between groups. A statistically significant positive correlation was observed between the buccolingual position of the MC and the skeletal pattern.</p><p><strong>Conclusions: </strong>It is essential to know the 3-dimensional position of the MC in different craniofacial patterns using CBCT for safe placement of temporary skeletal anchorage devices.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142900202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Introduction: A novel method was established for the staging of midpalatal suture (MPS) ossification based on a pseudocoloring stack of anterior and posterior MPS coronal slices obtained by cone-beam computed tomography (CBCT).
Methods: CBCT scans of 240 subjects aged 5-35 years were pseudocolor processed. The slice thickness of stacked anterior and posterior coronal observation planes was set at 5.0 mm. The ossification status of both anterior or posterior MPS was classified as the tunnel, partially ossified, or ossified type. MPSs were classified into 5 stages: stage I, anterior and posterior MPSs are the tunnel type; stage II, anterior and posterior MPSs are the tunnel and partially ossified type, respectively; stage III, anterior and posterior MPSs are the partially ossified type; stage IV, anterior and posterior MPSs are the tunnel or partially ossified type and ossified type, respectively; and stage V, anterior and posterior MPSs are the ossified type. The weighted κ value was used to assess the intraexaminer and interexaminer agreement of the MPS classifications.
Results: Intraexaminer and interexaminer reliability of the proposed staging method was substantial. The largest proportions of patients aged 5-15 years and 16-35 years were classified as stages I and III, respectively. Among adults, 31.0% of males and 7.1% of females were classified as stage I or II.
Conclusions: The pseudocolor imaging technique and the stack of CBCT slices provide relatively intuitive and comprehensive information on MPS ossification. The novel classification of MPS ossification is expected to serve as an indication of the necessity of surgical intervention for maxillary expansion treatment.
{"title":"A novel system for classification for midpalatal suture ossification based on pseudocolored and multilayer reconstructed coronal slices: Indication for selection of maxillary expansion methods.","authors":"Miri Chung, Wenyi Zhang, Yanfei Zhu, Zhengzhan Lv, Lingyong Jiang","doi":"10.1016/j.ajodo.2024.10.019","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.10.019","url":null,"abstract":"<p><strong>Introduction: </strong>A novel method was established for the staging of midpalatal suture (MPS) ossification based on a pseudocoloring stack of anterior and posterior MPS coronal slices obtained by cone-beam computed tomography (CBCT).</p><p><strong>Methods: </strong>CBCT scans of 240 subjects aged 5-35 years were pseudocolor processed. The slice thickness of stacked anterior and posterior coronal observation planes was set at 5.0 mm. The ossification status of both anterior or posterior MPS was classified as the tunnel, partially ossified, or ossified type. MPSs were classified into 5 stages: stage I, anterior and posterior MPSs are the tunnel type; stage II, anterior and posterior MPSs are the tunnel and partially ossified type, respectively; stage III, anterior and posterior MPSs are the partially ossified type; stage IV, anterior and posterior MPSs are the tunnel or partially ossified type and ossified type, respectively; and stage V, anterior and posterior MPSs are the ossified type. The weighted κ value was used to assess the intraexaminer and interexaminer agreement of the MPS classifications.</p><p><strong>Results: </strong>Intraexaminer and interexaminer reliability of the proposed staging method was substantial. The largest proportions of patients aged 5-15 years and 16-35 years were classified as stages I and III, respectively. Among adults, 31.0% of males and 7.1% of females were classified as stage I or II.</p><p><strong>Conclusions: </strong>The pseudocolor imaging technique and the stack of CBCT slices provide relatively intuitive and comprehensive information on MPS ossification. The novel classification of MPS ossification is expected to serve as an indication of the necessity of surgical intervention for maxillary expansion treatment.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142883546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-21DOI: 10.1016/j.ajodo.2024.10.020
Mesude Sinem Kuruhan, Zeynep Çoban Büyükbayraktar
Introduction: This study aimed to evaluate maxillary dental midline shifts and mandibular asymmetries created in different amounts and directions on photographs taken from 7 different angles by different groups and to determine acceptable esthetic limits.
Methods: Photographs of a female model in a social smile position were taken from 7 different angles (0° [frontal], 15°, 30°, and 45° on the right and left sides) and digitally modified for maxillary dental and mandibular midline deviations at specified degrees using Adobe Photoshop. To enable participants to evaluate the photographs sequentially, the photographs were transformed into videos using Adobe Premiere Pro software. The videos were rated by 188 participants (48 orthodontists; 49 dentists; 45 esthetic, plastic, and reconstructive surgeons; and 46 laypersons) using the visual analog scale (VAS) in a survey. An analysis of variance test was used to compare VAS scores among raters, and the Bonferroni test was used to compare VAS scores among the groups.
Results: The threshold for the acceptability of maxillary dental midline shifts was 2 mm for orthodontists; dentists; and esthetic, plastic, and reconstructive surgeons but 4 mm for laypersons. Although laypersons were unable to perceive changes in mandibular asymmetry between 0°-6°, the threshold was 3° for other groups. For participants in which mandibular asymmetries and maxillary dental midline shifts were in opposite directions, the threshold for all groups was 6°. For participants in which lower jaw asymmetries and maxillary dental midline shifts were in the same direction, the threshold value for orthodontists was 6°. Other groups could not perceive variables related to asymmetry.
Conclusions: More sensitive esthetic assessments can be made by evaluating smile esthetics from different angles. Mandibular asymmetries are considered more esthetically acceptable than maxillary dental midline shifts. In mandibular asymmetry and maxillary dental midline shifts, deviations in the same direction are more esthetically acceptable than deviations in opposite directions. Orthodontists are able to notice small changes in mandibular asymmetry.
{"title":"Acceptable esthetic limits for maxillary dental midline shift and mandibular asymmetry: Who notices what and how much?","authors":"Mesude Sinem Kuruhan, Zeynep Çoban Büyükbayraktar","doi":"10.1016/j.ajodo.2024.10.020","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.10.020","url":null,"abstract":"<p><strong>Introduction: </strong>This study aimed to evaluate maxillary dental midline shifts and mandibular asymmetries created in different amounts and directions on photographs taken from 7 different angles by different groups and to determine acceptable esthetic limits.</p><p><strong>Methods: </strong>Photographs of a female model in a social smile position were taken from 7 different angles (0° [frontal], 15°, 30°, and 45° on the right and left sides) and digitally modified for maxillary dental and mandibular midline deviations at specified degrees using Adobe Photoshop. To enable participants to evaluate the photographs sequentially, the photographs were transformed into videos using Adobe Premiere Pro software. The videos were rated by 188 participants (48 orthodontists; 49 dentists; 45 esthetic, plastic, and reconstructive surgeons; and 46 laypersons) using the visual analog scale (VAS) in a survey. An analysis of variance test was used to compare VAS scores among raters, and the Bonferroni test was used to compare VAS scores among the groups.</p><p><strong>Results: </strong>The threshold for the acceptability of maxillary dental midline shifts was 2 mm for orthodontists; dentists; and esthetic, plastic, and reconstructive surgeons but 4 mm for laypersons. Although laypersons were unable to perceive changes in mandibular asymmetry between 0°-6°, the threshold was 3° for other groups. For participants in which mandibular asymmetries and maxillary dental midline shifts were in opposite directions, the threshold for all groups was 6°. For participants in which lower jaw asymmetries and maxillary dental midline shifts were in the same direction, the threshold value for orthodontists was 6°. Other groups could not perceive variables related to asymmetry.</p><p><strong>Conclusions: </strong>More sensitive esthetic assessments can be made by evaluating smile esthetics from different angles. Mandibular asymmetries are considered more esthetically acceptable than maxillary dental midline shifts. In mandibular asymmetry and maxillary dental midline shifts, deviations in the same direction are more esthetically acceptable than deviations in opposite directions. Orthodontists are able to notice small changes in mandibular asymmetry.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-20DOI: 10.1016/j.ajodo.2024.11.004
Fernando Rayes Manhães, Tafnes Pereira da Silva, Cristiane Barros André, Heloísa Cristina Valdrighi, Carolina Carmo de Menezes, Silvia A S Vedovello
Introduction: This study evaluated the dentoskeletal effects of miniscrew-anchored maxillary protraction, which included a mandibular anchorage bar and a night facemask in adolescents.
Methods: A total of 20 growing patients with Class III malocclusion and maxillary deficiency were treated with a hybrid hyrax expander with 2 miniscrews in the maxilla and a mandibular anchor bar supported in 2 miniscrews in the anterior region of the mandible. Class III elastics were used from the maxillary first molars to the mandibular anchorage bar, joining the mandibular miniscrews installed between permanent incisors and canines. The variables that met the presuppositions of a parametric analysis were analyzed using the paired t test, and the remaining variables were analyzed using the nonparametric Wilcoxon paired test.
Results: The final sample included 17 subjects (4 females and 13 males; initial age, 12.3 ± 1.2 years). The results demonstrated a significant increase in Wits appraisal (mm), ANB (°), SNA (°), N perp-A (mm), Co-A (mm), Co-Gn (mm), AFAI (mm), molar relationship (mm), overjet (mm), U6-vertical Pt (mm), L1-NB (mm) and U1-L1 (°) (P <0.05).
Conclusions: The study showed that miniscrew-anchored maxillary protraction associated with facemasks and mandibular anchorage bars produces positive skeletal effects in adolescents while also favoring the control of dental effects.
{"title":"Dentoskeletal effects of miniscrew-anchored maxillary protraction: Evaluating the role of mandibular anchorage bar and night facemask.","authors":"Fernando Rayes Manhães, Tafnes Pereira da Silva, Cristiane Barros André, Heloísa Cristina Valdrighi, Carolina Carmo de Menezes, Silvia A S Vedovello","doi":"10.1016/j.ajodo.2024.11.004","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.11.004","url":null,"abstract":"<p><strong>Introduction: </strong>This study evaluated the dentoskeletal effects of miniscrew-anchored maxillary protraction, which included a mandibular anchorage bar and a night facemask in adolescents.</p><p><strong>Methods: </strong>A total of 20 growing patients with Class III malocclusion and maxillary deficiency were treated with a hybrid hyrax expander with 2 miniscrews in the maxilla and a mandibular anchor bar supported in 2 miniscrews in the anterior region of the mandible. Class III elastics were used from the maxillary first molars to the mandibular anchorage bar, joining the mandibular miniscrews installed between permanent incisors and canines. The variables that met the presuppositions of a parametric analysis were analyzed using the paired t test, and the remaining variables were analyzed using the nonparametric Wilcoxon paired test.</p><p><strong>Results: </strong>The final sample included 17 subjects (4 females and 13 males; initial age, 12.3 ± 1.2 years). The results demonstrated a significant increase in Wits appraisal (mm), ANB (°), SNA (°), N perp-A (mm), Co-A (mm), Co-Gn (mm), AFAI (mm), molar relationship (mm), overjet (mm), U6-vertical Pt (mm), L1-NB (mm) and U1-L1 (°) (P <0.05).</p><p><strong>Conclusions: </strong>The study showed that miniscrew-anchored maxillary protraction associated with facemasks and mandibular anchorage bars produces positive skeletal effects in adolescents while also favoring the control of dental effects.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-20DOI: 10.1016/j.ajodo.2024.10.012
Yağmur Lena Sezici , Meltem Gediz , Furkan Dindaroğlu
Introduction
This study aimed to assess the effect of the mandibular second molars on the stress distribution and initial displacements during leveling the curve of Spee using different archwire thicknesses and materials by means of finite element analysis.
Methods
After construction of all anatomic structures, including the mandibular alveolar bone, periodontal ligament, and dentition, 0.022-in slot brackets and 0.022 × 0.028-in molar tubes were placed on the buccal surfaces of the teeth. Different archwires were modeled, with 2 different thicknesses (0.016-in and 0.017 × 0.025-in) and 3 different materials (nickel-titanium, stainless steel, and titanium molybdenum). Two different models were created: The mandibular dentition (1) with and (2) without second molars. The initial teeth movements and periodontal ligament stress distribution after leveling were analyzed for each of the models and archwires.
Results
The initial stress levels with all archwires were higher when the second molars were also included. The highest von Mises stresses were 16.75 N/mm2 with the 0.017 × 0.025-in stainless steel archwire. Periodontal stresses were mostly concentrated in the apical area of the incisors. The tendency of labial tipping increased with the attachment of second molars. Thicker archwires with all materials were noticed to enhance the anterior tipping of the incisors. In both scenarios, the least movement occurred on the x-axis.
Conclusions
The inclusion of the second molars enhanced the stress level and the initial anterior tipping of the incisors. However, the bonding of the second molars did not have any effect on the initial displacement in the transverse direction for all the archwires used. As the archwire dimension increased, higher stress values were observed on the whole mandibular dentition.
{"title":"What is the role of second molars in leveling the curve of Spee? A finite element analysis study","authors":"Yağmur Lena Sezici , Meltem Gediz , Furkan Dindaroğlu","doi":"10.1016/j.ajodo.2024.10.012","DOIUrl":"10.1016/j.ajodo.2024.10.012","url":null,"abstract":"<div><h3>Introduction</h3><div>This study aimed to assess the effect of the mandibular second molars on the stress distribution and initial displacements during leveling the curve of Spee using different archwire thicknesses and materials by means of finite element analysis.</div></div><div><h3>Methods</h3><div>After construction of all anatomic structures, including the mandibular alveolar bone, periodontal ligament, and dentition, 0.022-in slot brackets and 0.022 × 0.028-in molar tubes were placed on the buccal surfaces of the teeth. Different archwires were modeled, with 2 different thicknesses (0.016-in and 0.017 × 0.025-in) and 3 different materials (nickel-titanium, stainless steel, and titanium molybdenum). Two different models were created: The mandibular dentition (1) with and (2) without second molars. The initial teeth movements and periodontal ligament stress distribution after leveling were analyzed for each of the models and archwires.</div></div><div><h3>Results</h3><div>The initial stress levels with all archwires were higher when the second molars were also included. The highest von Mises stresses were 16.75 N/mm<sup>2</sup> with the 0.017 × 0.025-in stainless steel archwire. Periodontal stresses were mostly concentrated in the apical area of the incisors. The tendency of labial tipping increased with the attachment of second molars. Thicker archwires with all materials were noticed to enhance the anterior tipping of the incisors. In both scenarios, the least movement occurred on the x-axis.</div></div><div><h3>Conclusions</h3><div>The inclusion of the second molars enhanced the stress level and the initial anterior tipping of the incisors. However, the bonding of the second molars did not have any effect on the initial displacement in the transverse direction for all the archwires used. As the archwire dimension increased, higher stress values were observed on the whole mandibular dentition.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 3","pages":"Pages 296-308"},"PeriodicalIF":2.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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