International Orthodontics最新文献

{"title":"Analysis of quality of orthodontic treatment and determining factors that affect the quality of finishing in orthodontic graduate clinic using peer assessment rating: A retrospective case-control study study","authors":"Maria A. Ossa ,&nbsp;Katherine Tran ,&nbsp;Sasha Z. Daroga ,&nbsp;Kaylee A. Gomez ,&nbsp;Wei-En Lu ,&nbsp;Ai Ni ,&nbsp;Zongyang Sun ,&nbsp;Henry W. Fields ,&nbsp;Toru Deguchi","doi":"10.1016/j.ortho.2025.101003","DOIUrl":"10.1016/j.ortho.2025.101003","url":null,"abstract":"<div><h3>Background</h3><div>The objective of this study was to analyse recently treated orthodontic patients to evaluate the quality of treatment in the graduate orthodontic clinic at the Ohio State University and determine what factors correlate to the how cases are finished.</div></div><div><h3>Methods</h3><div>Models of 229 patients were scored using the peer assessment rating (PAR) index. The cases were divided into groups, well-finished cases, which are those that had a PAR score reduction by at least 22pts or for those that started with a score less than 22pts a final PAR score of 0 and not well-finished cases. Cephalometric data, treatment age, treatment type, treatment time, faculty, payment type, motivation, initial hygiene impression, and failed appointments were recorded. Statistical analyses completed included a multiple logistic regression.</div></div><div><h3>Results</h3><div>The total percent of cases of improvement in PAR was 45.4%, 48.5%, 6.1% for greatly improved, improved and not improved respectively. The pre-treatment upper and lower anterior alignment, overjet, overbite and midline deviation were significantly related to the quality of treatment outcome (<em>P</em> <!-->&lt;<!--> <!-->0.05). The total PAR reduction rate was similar between full-time and part-time teachers, but when categorised, it showed a difference with a decrease by a multiplicative factor of 8.200. However, this statistical difference is not significant after adjustment with other covariates (<em>P</em> <!-->=<!--> <!-->0.69).</div></div><div><h3>Conclusions</h3><div>Patients who start with more upper or lower anterior crowding, overjet, overbite, or midline deviation may be difficult to correct than cases that does not have those characteristics. Also, there may be difference between part- and full-time faculty regarding treatment efficiency in orthodontic graduate clinic.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 101003"},"PeriodicalIF":1.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760871","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}

{"title":"En-masse maxillary anterior retraction to close the extraction space with fixed orthodontic appliances: A systematic review","authors":"Ziad M. Montasser ,&nbsp;Andrea Scribante ,&nbsp;Paolo Zampetti ,&nbsp;Mona A. Montasser","doi":"10.1016/j.ortho.2025.101004","DOIUrl":"10.1016/j.ortho.2025.101004","url":null,"abstract":"<div><h3>Objective</h3><div>To evaluate the evidence on the treatment results and patients’ reported outcomes of the en-masse maxillary anterior retraction technique.</div></div><div><h3>Material and methods</h3><div>Web of Science™, MEDLINE (via PubMed®), and Scopus electronic databases and reference lists of relevant studies were comprehensively searched on September 24, 2024 with no time frame limitation but, with the language limited to English. Randomized clinical trials investigating en-masse retraction in orthodontic patients who needed maxillary first premolars extraction were selected using keywords to search the titles and abstracts before a detailed reading of each full text in the next steps. Primary outcomes included rate, duration, or amount of anterior retraction and anchorage loss while secondary outcomes included positional changes in the anterior and molar teeth, root resorption of the anterior teeth, and patients’ experiences. The Cochrane Collaboration's risk of bias tool was used for risk of bias and quality assessment of the included studies.</div></div><div><h3>Results</h3><div>There were 257 articles deemed potentially suitable for the review. Removing duplicates, careful reading the titles and abstracts, and applying the inclusion/exclusion criteria left 22 articles were included. The risk of bias assessment showed 3, 7, and 12 studies of “high”, “some concerns” or “low” risk of bias respectively. En-masse retraction produced similar incisor retraction and anchorage loss in about half the time needed by the two-step mechanics. Corticotomy, micro-osteoperforation, and low level laser therapy showed positive results for accelerating en-masse retraction. while piezocision and platelet rich plasma did not. Root resorption of the incisors could increase when using mini-screws, especially infra-zygomatic mini-screws.</div></div><div><h3>Conclusions</h3><div>There is need for future RCT on the different outcomes done according to standardized methodologies. Corticotomy, micro-osteoperforation, and low-level laser showed positive results in accelerating en-masse retraction, but the clinical significance remains unclear. Rate of tooth movement was similar in piezocision, platelet-rich plasma, and the control groups. Mini-screws, especially infra-zygomatic mini-screws, increase the chance of root resorption, but the force system arrangement is crucial.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 101004"},"PeriodicalIF":1.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760195","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}

{"title":"A cross-sectional analysis of the reliability, content and readability of orthodontic retention and retainer informed consent forms","authors":"Maurice J. Meade ,&nbsp;Sven Jensen ,&nbsp;Xiangqun Ju ,&nbsp;David Hunter ,&nbsp;Lisa Jamieson","doi":"10.1016/j.ortho.2025.101002","DOIUrl":"10.1016/j.ortho.2025.101002","url":null,"abstract":"<div><h3>Objective</h3><div>The aim of the study was to determine the reliability, quality and readability of content contained within informed consent forms concerning orthodontic retention and retainers provided by orthodontic treatment providers.</div></div><div><h3>Methods</h3><div>An online search strategy identified informed consent forms for evaluation. The DISCERN instrument was used to determine content reliability. Each form was assessed for the presence of pre-determined content regarding 11 domains. Analysis for quality of the domain content was via a 4-point scoring scale. The Simple Measure of Gobbledegook (SMOG) and the Flesch-Kincaid Grade-Level (FKGL) were employed to determine readability.</div></div><div><h3>Results</h3><div>Thirty-four forms satisfied selection criteria. The majority (<em>n</em> <!-->=<!--> <!-->20; 58.8%) were sourced from websites in the US, with most (<em>n</em> <!-->=<!--> <!-->22; 64.7%) from specialist orthodontist websites. The mean (SD) DISCERN score per form was 31.9 (4.5). The mean (SD) number of domains present within each form was 7.76 (1.65). The mean (SD) number of points scored per form was 14.82 (3.01) from a maximum of 33. Information regarding retainer review and relevant potential impacts on quality-of-life was lacking and scored poorly. The requirement for lifetime retention was stated in 25 (73.5%) forms. Forms sourced from specialist orthodontist websites scored higher (<em>P</em> <!-->=<!--> <!-->0.016) than those sourced from general dentist and multi-disciplinary clinic websites. The median (IQR) SMOG and FKGL scores were 10.11 (9.55) and 9.95 (9.18) respectively.</div></div><div><h3>Conclusions</h3><div>The reliability and quality of the informed consent forms concerning orthodontic retention and retainers was generally poor. The readability of the forms failed to meet recommended guidelines, meaning that many are likely not to comprehend the information provided.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 101002"},"PeriodicalIF":1.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748604","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}

{"title":"Comparison of the friction resistance of 3D-printed polyurethane orthodontic brackets with and without zirconium oxide nanoparticles with conventional metal and ceramic brackets: An in vitro study","authors":"Srinidhi Ramasundaram,&nbsp;Dilip Srinivasan,&nbsp;Ravi Kannan,&nbsp;Devasahayam Davis","doi":"10.1016/j.ortho.2025.101001","DOIUrl":"10.1016/j.ortho.2025.101001","url":null,"abstract":"<div><h3>Aim</h3><div>To compare the frictional resistance of 3D-printed zirconium oxide nanoparticles reinforced polyurethane orthodontic brackets, 3D-printed Polyurethane orthodontic brackets, conventional metal and ceramic brackets in an in vitro environment.</div></div><div><h3>Methods</h3><div>Stereolithography was used to 3D print the polymer orthodontic brackets and zirconium oxide-reinforced polymer orthodontic brackets. Conventional metal brackets and conventional ceramic brackets were used as controls. The frictional force between the bracket and the archwire was measured under dry conditions with an Instron universal testing machine with a sliding velocity of 1<!--> <!-->mm/minute and a load cell of 50<!--> <!-->N. The Kruskal-Wallis test with post hoc test (Mann-Whitney U test) was used for statistical analyses (significance level <em>P</em> <!-->&lt;<!--> <!-->0.05).</div></div><div><h3>Results</h3><div>There is no significant difference observed between 3D-printed zirconium oxide-reinforced polymer orthodontic brackets and 3D-printed polymer orthodontic brackets. The frictional resistance was found to be the least in 3D-printed polyurethane brackets (1.3895<!--> <!-->+<!--> <!-->0.72583<!--> <!-->N), followed by 3D-printed zirconium oxide-reinforced polyurethane brackets (2.15<!--> <!-->+<!--> <!-->0.75683<!--> <!-->N), conventional metal brackets (2.348<!--> <!-->+<!--> <!-->0.82682<!--> <!-->N), and it was highest in conventional ceramic brackets (4.9675<!--> <!-->+<!--> <!-->0.88519<!--> <!-->N).</div></div><div><h3>Conclusions</h3><div>The incorporation of zirconium oxide nanoparticles increased the frictional resistance of 3D-printed polymer orthodontic brackets, but it was not statistically significant. Hence, zirconium oxide nanoparticles could be considered as a better reinforcement for polymer brackets for enhanced clinical utility.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 101001"},"PeriodicalIF":1.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739760","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}

{"title":"Comparison of stress distribution and displacement pattern of maxillary expansion in craniomaxillary complex using rapid maxillary expander and maxillary skeletal expander: A finite element model analysis","authors":"Monalisa Goswami,&nbsp;Anshu Sahu,&nbsp;Raghu Ranjan Prasad,&nbsp;Parul Priya,&nbsp;Parul Priya,&nbsp;Shovan Roy,&nbsp;Abhijith A","doi":"10.1016/j.ortho.2025.100997","DOIUrl":"10.1016/j.ortho.2025.100997","url":null,"abstract":"<div><h3>Introduction</h3><div>A combination of miniscrews and the maxillary skeletal expander (MSE) was created to address potential issues with the traditional rapid maxillary expander (RME). This study was conducted to assess and compare stress distribution and displacement patterns in the craniomaxillary complex during maxillary expansion using Rapid Maxillary Expander (RME) and Maxillary Skeletal Expander (MSE) using 3D Finite Element model.</div></div><div><h3>Methods</h3><div>A 3D Finite Element model of the craniomaxillary complex, including the maxilla and maxillary dentition, was generated using computer aided design software. Stress distribution and displacement patterns were analysed for both RME and MSE treatments.</div></div><div><h3>Results</h3><div>The results showed that MSE had greater bone displacement, bone stress, teeth displacement, teeth stress, and periodontal displacement and stress compared to RME. In terms of suture displacement, MSE had higher frontonasal suture displacement compared to RME. Teeth displacement showed that central and lateral incisors showed palatal displacement with RME and buccal displacement with MSE, while canine, premolars, and molars all showed greater buccal displacement with MSE compared to RME along the transverse axis. Central incisor displacement was observed in the extrusion direction with RME, while it was in the intrusion direction with MSE. In terms of teeth stress, MSE treatment resulted in higher stress on the central incisor, lateral incisor, canine, premolars, and molars compared to RME treatment.</div></div><div><h3>Discussion</h3><div>Overall, MSE exhibited greater bone displacement, stress, and suture displacement/stress compared to RME. Additionally, MSE induced different tooth displacement patterns with higher stress on teeth compared to RME. These findings suggest differences in treatment outcomes and biomechanical effects between the two expansion methods.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 100997"},"PeriodicalIF":1.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705376","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}

{"title":"Root symmetry between homologous upper incisors in non-orthodontic patients: A cross-sectional study","authors":"Antuanet Eymy Ñaupari-Gonzales ,&nbsp;Vania Miriam Medina-Huaringa ,&nbsp;Heraldo Luis Dias- Da Silveira ,&nbsp;Yalil Augusto Rodríguez-Cárdenas ,&nbsp;Luis Ernesto Arriola-Guillén","doi":"10.1016/j.ortho.2025.101000","DOIUrl":"10.1016/j.ortho.2025.101000","url":null,"abstract":"<div><h3>Introduction</h3><div>This study aimed to assess the symmetry in length, shape, and root dilaceration between homologous upper incisors of non-orthodontic patients using digital panoramic radiographs (DPR).</div></div><div><h3>Methods</h3><div>This retrospective cross-sectional study evaluated 200 DPR obtained from a private radiology centre in Lima, Peru. All successive patients meeting the eligibility criteria were included from January to August 2024 (86 men and 114 women, 27.84<!--> <!-->±<!--> <!-->8.69<!--> <!-->years and 28.52<!--> <!-->±<!--> <!-->8.38 respectively). Eight hundred upper incisors were examined, divided equally into upper central incisors (UCI) (<em>n</em> <!-->=<!--> <!-->400) and upper lateral incisors (ULI) (<em>n</em> <!-->=<!--> <!-->400). The dental imaging software Blue Sky Plan 4.13.35 was utilized to evaluate root length (as a ratio), root shape (using the Albrecht classification), and root dilaceration (according to the Chohayeb classification) while comparing homologous upper incisors. For statistical analysis, weighted Kappa tests and binary logistic regression were employed, with the significance level set at <em>P</em> <!-->&lt;<!--> <!-->0.05.</div></div><div><h3>Results</h3><div>Among the 200 radiographs, root length symmetry was observed in 192 patients (96%) for UCI and in 185 patients (92.5%) for ULI. Additionally, root shape symmetry was found in 171 patients (85.5%) for UCI and in 124 patients (62%) for ULI. Regarding dilaceration symmetry, 198 patients (99%) showed symmetry for UCI, while 188 patients (94%) did so for ULI. The multivariate analysis indicated that the male sex was more likely to exhibit root shape symmetry in upper lateral incisors (<em>P</em> <!-->=<!--> <!-->0.033).</div></div><div><h3>Conclusions</h3><div>Most homologous upper incisors display symmetry regarding root length, shape, and dilaceration. However, this symmetry is more prevalent in central than lateral incisors, in which the root shapes may differ between homologous teeth. Orthodontists should consider these findings in their practice.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 101000"},"PeriodicalIF":1.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703990","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}

{"title":"3D analysis of morphological changes, maxillary central incisor–incisive canal relationship, and root resorption in subjects with maxillary incisors protrusion who underwent non-extraction fixed appliance therapy considering demographic and skeletal factors: A retrospective study","authors":"Remsh Khaled Al-Rokhami ,&nbsp;Hongzheng Gu ,&nbsp;Xiaobao Dang ,&nbsp;Zhihua Li ,&nbsp;Sadam Ahmed Elayah ,&nbsp;Xing Zhao ,&nbsp;Karim Ahmed Sakran","doi":"10.1016/j.ortho.2025.100993","DOIUrl":"10.1016/j.ortho.2025.100993","url":null,"abstract":"<div><h3>Introduction</h3><div>To assess changes in the morphology and relationship between the maxillary central incisor and incisive canal (U1-IC) and estimate root resorption following non-extraction orthodontic treatment with fixed appliances, based on sex, age, and skeletal sagittal and facial classifications.</div></div><div><h3>Material and methods</h3><div>All patients treated with maxillary incisors retraction using fixed appliances without extraction between 2015 and 2023 and met the inclusion criteria were included in the study. Measurements, including IC width, root-IC distance, cortical bone width (CBW), IC height, and root resorption, were taken before (T1) and after (T2) treatment at specified heights (H1, H2, and H3; 2<!--> <!-->mm, 4<!--> <!-->mm, and 6<!--> <!-->mm above the labial cementoenamel junction of U1).</div></div><div><h3>Results</h3><div>The sample included 44 patients (88 maxillary central incisors), with 18 males, 26 females, 27 teenagers, and 17 adults. Of these, 10 were Class I, 34 Class II, 7 low facial, 27 average facial, and 10 high facial groups. Significant reductions were observed in IC width, CBW, root-IC distance, and U1 length/width after treatment, across sexes, age groups, sagittal classes, and facial groups, particularly at most heights. Class II subjects showed greater reductions in U1 root-IC distance, length, and width compared to Class I. The average root resorption was 1.01<!--> <!-->±<!--> <!-->0.68<!--> <!-->mm post-treatment, with higher resorption in males (<em>P</em> <!-->=<!--> <!-->0.004), Class II (<em>P</em> <!-->&lt;<!--> <!-->0.001), and low facial groups (<em>P</em> <!-->=<!--> <!-->0.007). The post-treatment U1-IC relationship showed the highest rates of approximation (68.2%) at the H2 and H3 levels, while contact and invasion rates were highest at the H1 level (13.6% and 9.1%, respectively). U1 tooth movement, U1 length, IC height, and ABO index were significant predictors of a negative U1-IC relationship.</div></div><div><h3>Conclusions</h3><div>Maxillary incisors retraction during fixed orthodontic treatment impacts the U1-IC relationship and root resorption, with variations across demographic and skeletal groups, underscoring the importance of considering individual anatomical and skeletal factors in treatment planning.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 100993"},"PeriodicalIF":1.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637254","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}

{"title":"Comparison of soft tissue facial changes in patients 7–11 years of age with and without maxillary expansion utilizing CBCTs and 3D facial scans: A preliminary study","authors":"Nafisa Molla ,&nbsp;Heesoo Oh ,&nbsp;Giseon Heo ,&nbsp;Raisa Catunda ,&nbsp;Manuel Lagravère","doi":"10.1016/j.ortho.2025.100998","DOIUrl":"10.1016/j.ortho.2025.100998","url":null,"abstract":"<div><h3>Background</h3><div>The objectives of this study are to evaluate the effects of maxillary expansion over a period of 12 months on facial soft tissue measurements in children aged 7–11 years with a maxillary transverse deficiency of at least 5<!--> <!-->mm or bilateral posterior crossbite, utilizing both CBCTs and 3D facial scans, by comparison to a control group.</div></div><div><h3>Material and methods</h3><div>Data was collected from 32 patients and consisted of two groups: control and treatment (Hyrax expansion via RME, 1 turn/day). Each patient in each group underwent CBCTs, 3D facial scans and hand-wrist radiographs at two time points: pre-treatment (T0), and after the completion of expansion at post-retention (T1, 12 months). CBCTs were assessed using 3D Slicer software and 3D facial scans were assessed using OrthoInsight 3D software. The soft tissue measurements evaluated included the following: alar width, alar base width, mouth width, philtrum width, nasal tip prominence, nasolabial angle, upper lip to E-line, lower lip to E-line, upper lip height, height of vermillion of upper lip, lower lip height, height of nose, lower facial height and intercanthal width. Statistical analysis included intra- and inter-rater variability, measurement error calculation and MANOVA tests.</div></div><div><h3>Results</h3><div>From a total of 32 patients with two sets of imaging records, no statistically significant differences were found between the two groups over the one-year observation. However, when comparing the two modalities utilized in this study (CBCT imaging and 3D facial scanning), the correlation was not as optimal for specific outcome variables such as alar base width and intercanthal width, potentially due to anatomic, imaging protocols and patient related factors.</div></div><div><h3>Conclusion</h3><div>The findings of this study suggest that the children in both groups experienced similar facial soft tissue changes.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 100998"},"PeriodicalIF":1.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637257","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}

{"title":"Hypodontia as a predictor of third molar agenesis: A comparative cross-sectional study according to sex and tooth type in a French orthodontic population","authors":"Anaïs Cavaré ,&nbsp;Pierre-Hadrien Decaup ,&nbsp;Marie-José Boileau ,&nbsp;Elsa Garot","doi":"10.1016/j.ortho.2025.100999","DOIUrl":"10.1016/j.ortho.2025.100999","url":null,"abstract":"<div><h3>Objectives</h3><div>The aim of this study was to determine the patterns of third molar agenesis and to investigate potential relationships with the agenesis of other permanent teeth, the type of missing teeth, and sex.</div></div><div><h3>Methods</h3><div>Panoramic radiographs from 4081 orthodontic patients aged 11 to 21 years were examined to identify non-syndromic tooth agenesis, including third molars. McNemar's Chi-square tests were used to compare the prevalence of third molar agenesis between jaws or sides. Logistic regression analyses were conducted to explore associations between the occurrence or patterns of third molar agenesis and potential explanatory factors.</div></div><div><h3>Results</h3><div>Third molar agenesis was observed in 19.0% of the sample (19.3% for females and 18.7% for males). The most common patterns of third molar agenesis were bilateral absence of the lower third molars (16.8%) and all third molars missing (16.7%). Third molar agenesis was 3.92 (95% CI<!--> <!-->=<!--> <!-->3.07–5.00; <em>P</em> <!-->&lt;<!--> <!-->0.001) times more likely to occur when other permanent teeth were congenitally missing. The congenital absence of maxillary lateral incisors was associated with the agenesis of third molars in the maxilla (OR<!--> <!-->=<!--> <!-->3.93; 95% CI<!--> <!-->=<!--> <!-->1.07–13.70; <em>P</em> <!-->=<!--> <!-->0.034). At least one missing mandibular third molar was involved in the patterns associated with the agenesis of other permanent teeth. No sexual dimorphism was observed.</div></div><div><h3>Conclusion</h3><div>Third molar agenesis appears to represent a continuum with the agenesis of other teeth, reflecting strong genetic control, affecting both sexes similarly.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 100999"},"PeriodicalIF":1.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637255","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}

{"title":"Does operator experience affect the accuracy of guided palatal miniscrew insertion via surgical guide? An in-vitro study","authors":"Amedeo Salomone ,&nbsp;Mario Palone ,&nbsp;Francesca Cremonini ,&nbsp;Giuliano Maino ,&nbsp;Emanuele Paoletto ,&nbsp;Marta Cappelletti ,&nbsp;Luca Lombardo","doi":"10.1016/j.ortho.2025.100995","DOIUrl":"10.1016/j.ortho.2025.100995","url":null,"abstract":"<div><h3>Introduction</h3><div>To compare the in-vitro accuracy of guided palatal miniscrew insertion comparing expert and inexpert clinicians.</div></div><div><h3>Material and methods</h3><div>Twenty-one synthetic bone models, derived from a single master model, were acquired to simulate the clinical act of miniscrew insertion. Digital planning and CAD/CAM surgical guide manufacturing were executed by matching the CBCT of the master model with its corresponding STL file. The insertion of two palatal miniscrews in the anterior paramedian region was planned. The operators (mean age 35 years<!--> <!-->±<!--> <!-->5 years; 11 males and 9 females) were divided into two sub-groups (inexperienced and experienced), and the miniscrews inserted using a standardized procedure. Linear and angular discrepancies between planned and inserted miniscrew positions were then evaluated at the level of head and tip point by superimposing the reference model (derived from digital planning) with the 20 working models (derived from scanning after miniscrew insertion). Absolute accuracy and comparison between the sub-groups were assessed using a one-sample Wilcoxon test (<em>P</em> <!-->&lt;<!--> <!-->0.05).</div></div><div><h3>Results</h3><div>Regardless of experience, a statistically significant difference in all investigated measurements was found. However, no statistically significant differences were detected between the two sub-groups, except for the sagittal discrepancy at the head, with the inexperienced group being less accurate (<em>P</em> <!-->=<!--> <!-->0.002).</div></div><div><h3>Conclusions</h3><div>The use of a CAD/CAM surgical guide ensures comparable accuracy between inexperienced and experienced clinicians, excepting some outlier discrepancies among the inexpert subjects. Although there are differences in accuracy between the planned and achieved miniscrew position, these differences do not appear to be clinically significant.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"23 3","pages":"Article 100995"},"PeriodicalIF":1.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637256","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}