Journal of Orthodontic Science最新文献

{"title":"Urinary nickel and chromium levels in orthodontic patients: A case-control study.","authors":"Rihab A Al-Rawe, Fudhla S Al-Zubaydi, Mohammed Nahidh, Bassam Alsheekhly","doi":"10.4103/jos.jos_131_24","DOIUrl":"10.4103/jos.jos_131_24","url":null,"abstract":"<p><strong>Objectives: </strong>This case-control study aimed to evaluate the levels of nickel (Ni) and chromium (Cr) ions in the urine of patients undergoing fixed orthodontic treatment, specifically comparing patients treated with nickel-titanium (NiTi) and stainless steel (SS) archwires to a control group without appliance.</p><p><strong>Methods: </strong>Fifty-one participants were recruited and divided into two case groups and one control group, with 17 participants in each group. Group 1 consisted of patients treated with NiTi archwires for six to eight months, and Group 2 included patients treated with SS archwires for 12 to 18 months. The control group comprised participants with no history of orthodontic treatment. Urine samples were collected and analyzed for Ni and Cr concentrations using atomic absorption spectrophotometry. Statistical analyses were performed using the one-way analysis of variance (ANOVA) test.</p><p><strong>Results: </strong>A significant increase in urinary Cr levels was observed in the SS group compared to both the control and the NiTi groups (<i>P</i> < 0.001). No significant difference in Cr levels was found between the NiTi group and the control group (<i>P</i> > 0.05). Regarding Ni concentrations, no statistically significant differences were detected among the three groups (<i>P</i> = 0.109), although higher levels were observed in the SS group.</p><p><strong>Conclusions: </strong>SS archwires result in a significantly higher release of Cr ions compared to NiTi archwires and untreated controls, raising potential concerns about prolonged Cr exposure during orthodontic treatment. However, both NiTi and SS archwires appear to release relatively low amounts of Ni, with no significant differences among groups.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"21"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237004/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591447","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":"Evaluation of the pharyngeal airway dimensions measured by cephalometrics and cone beam computed tomography in patients with skeletal class II malocclusions.","authors":"Trinh Thi Ngoc Nguyen, Lam Nguyen Le, Ngan Thi Bich Truong, Phung Thi Thanh Nguyen, Cuong Manh Tran, Tranh Thi Huyen Trinh, Loc Truong Tan, Kha Van Nguyen","doi":"10.4103/jos.jos_124_24","DOIUrl":"10.4103/jos.jos_124_24","url":null,"abstract":"<p><strong>Objective: </strong>To assess the correlation between pharyngeal airway dimension measurements via cephalometrics and those via cone beam computed tomography (CBCT) in patients with skeletal Class II malocclusions.</p><p><strong>Subjects and methods: </strong>In this cross-sectional retrospective study, we reviewed the medical records of 106 patients referred for both CBCT and cephalometric imaging between 2022 and 2023 at Can Tho University of Medicine and Pharmacy Hospital. Pharyngeal airway dimensions were measured using WEBCEPH software for cephalometric analysis and Mimics Research software for CBCT image processing and analysis.</p><p><strong>Results: </strong>A strong correlation between cephalometric films and CBCT images was observed regarding airway parameters. The airway volume exhibited a negative correlation with the ANB and SN-GoGn angles and a positive correlation with the SNB angle.</p><p><strong>Conclusions: </strong>Cephalometric analysis may serve as a fundamental screening tool to provide valuable information regarding the morphological characteristics of the airway as an alternative to CBCT.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"24"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237005/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591429","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":"Assessment of AI-based monitoring method in assessing oral hygiene during orthodontic treatment.","authors":"Aseem Sharma, Tanushree Sharma, Geetika Tomer, Snigdha Pattanaik, Bhumika Khattar, N R Shrinivaasan, K Saidath, Monsoon Mishra, Varadarjula V Ram","doi":"10.4103/jos.jos_146_24","DOIUrl":"10.4103/jos.jos_146_24","url":null,"abstract":"<p><strong>Background/objectives: </strong>Patients receiving orthodontic treatment should have their oral hygiene regularly maintained. Patients can improve their oral hygiene performance during orthodontic treatment with the use of remote digital monitoring. The current research was done to assess the AI-based monitoring method in improving oral hygiene during orthodontic procedure.</p><p><strong>Methodology: </strong>Forty patients scheduled for fixed orthodontic treatment were divided into two groups of 20 each as; Group A- Control group, Group B- Test group (AI monitoring). Patients in the test group received a cheek retractor and scan box (Dental Monitoring®) and were directed to undergo regular intraoral scans. Orthodontic Plaque Index (OPI), Marginal Gingival Index (MGI), and White Spot Lesions (WSL) evaluated for both groups at baseline period (P0), after 2 weeks, 4 weeks and 6 weeks as P1, P2, P3, respectively, and at 3 months (P4). The obtained data was statistically analyzed.</p><p><strong>Result: </strong>In comparison to the control group, test group subjects demonstrated a substantial decrease in plaque score, gingival inflammation and White Spot Lesions (WSL).</p><p><strong>Conclusion: </strong>During orthodontic treatment, integrating a remote monitoring system improves plaque, gingival inflammation, and white spot lesions. This method helps patients to retain their best possible oral health.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"17"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237006/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591483","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":"Debonding stresses of metal orthodontic brackets retained to tooth enamel with co-cured self-etch primer.","authors":"Khalid M Abdelaziz, Afnan Alayyash, Youssef A Algarni, Abdulaziz M Alshahrani, David F Murchison","doi":"10.4103/jos.jos_130_24","DOIUrl":"10.4103/jos.jos_130_24","url":null,"abstract":"<p><strong>Objective: </strong>To evaluate the efficiency of the self-etch primer co-curing protocol in retaining orthodontic brackets to tooth enamel.</p><p><strong>Materials and methods: </strong>A self-etch orthodontic resin primer was pre-cured or co-cured together with the resin adhesive (Groups 1 and 2) to retain either non-coated or pre-coated orthodontic brackets (Subgroups 1 and 2) on the buccal surfaces of extracted premolars. The debonding shear stress values were evaluated immediately after bonding (Category 1) and after exposure to cyclic intraoral hydraulic, thermal, and mechanical stress simulations (Category 2). The adhesive remnant index (ARI) was also assessed for each test category.</p><p><strong>Results: </strong>The co-cured primer provided higher immediate debonding stress values for both non- and pre-coated brackets (Tukey's, <i>P</i> < 0.05) than the pre-cured primer. However, after artificial aging and stress simulation, there was no difference in bonding values for the four test categories (Tukey's, <i>P</i> > 0.05). The delayed debonding stress values were lower than the immediately assessed values (Tukey's, <i>P</i> < 0.05) for both brackets. No difference (Mann-Whitney's, <i>P</i> > 0.05) was noticed in the ARIs of all test categories.</p><p><strong>Conclusion: </strong>Although intraoral stress simulation reduced the brackets' debonding values, co-curing the self-etch orthodontic primer may offer clinically efficient bonding of both non- and pre-coated metal brackets with minimal harm to tooth enamel on debonding.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"25"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237001/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591426","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":"Assessment of condylar and glenoid fossa dimension in various sagittal skeletal malocclusions.","authors":"Ashish Ravi Kallur, Remmiya Mary Varghese","doi":"10.4103/jos.jos_105_24","DOIUrl":"10.4103/jos.jos_105_24","url":null,"abstract":"<p><strong>Introduction: </strong>Jaw mobility and oral function depend on the temporomandibular joint (TMJ), with the dimensions of the mandibular condyle and glenoid fossa being important for understanding dental and orthodontic conditions. Additionally, advanced imaging, like cone-beam computed tomography (CBCT), has improved the study of condylar morphology, aiding diagnosis and treatment planning.</p><p><strong>Aim: </strong>To perform morphometric analysis of the TMJs using CBCT in all three dimensions in various skeletal malocclusions.</p><p><strong>Materials and methods: </strong>CBCT images of 84 patients were collected for the study. FACAD (ILEXIS AB, Linköping, Sweden) software was used to divide the patients into Class I, II, and III skeletal malocclusions. Dolphin software was used to measure the width, length, and height of condyles and glenoid fossa of the patients from the CBCT images. The Shapiro-Wilk test was used to check normality. ANOVA test was performed to assess the statistical significance of the results between the 3 groups.</p><p><strong>Results: </strong>The sample consisted of 30 patients with class I skeletal relation, 34 patients with class II relation, and 20 patients with class III relation. In class I relation, the average condylar height is found to be 16.32 mm ± 2.16 mm, width is 16.47 mm ± 2.61 mm, and length 7.65 mm ± 1.5 mm. The average dimensions of the glenoid fossa in class I skeletal relation were measured to be 19.93 mm ± 2.64 mm in width, 13.93 mm ± 1.45 mm in length, and 6.4 mm ± 1.49 mm in height.</p><p><strong>Conclusion: </strong>A statistically significant difference was noted in the condylar width and condylar height among the various skeletal malocclusions. The morphological parameters assessed in this study require more investigation to fully understand the mechanisms underlying them and investigate the consequences for orthodontic treatment and TMJ health.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"16"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237002/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591484","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":"Impacted canine prevalence, localization, and related etiological factors among orthodontic sample of Fallujah city.","authors":"Laith Hamood Aswad Al-Salmany, Lara Kusrat Hussein, Zena Hekmat Altaee","doi":"10.4103/jos.jos_109_24","DOIUrl":"10.4103/jos.jos_109_24","url":null,"abstract":"<p><strong>Objective: </strong>Canine impaction isn't uncommon malocclusion and their treatment is complex and annoying to both patient and orthodontist. This study was aimed to determine the prevalence of impacted canine in orthodontic patients of Fallujah city with determining the related etiological factors.</p><p><strong>Materials and methods: </strong>The study consisted of 590 patients (412 females and 178 males) coming to the clinic for orthodontic treatment. A panoramic radiograph was taken for each subject. Cone beam computed tomography was taken for each patient with an impacted canine for accurate localization of trapped teeth. Patients with impacted canines were examined for number, distribution, crown depth, angulation and apical position of impacted teeth, lateral incisor condition, and presence of associated local factors.</p><p><strong>Results: </strong>For the total sample, forty patients (40) had impacted canines with a mean age of 22.6 years. Female to male ratio was 1.5:1. The maxilla represented 80.6% of total impaction cases. Palatally impacted canines represented 72.6% and were mostly seen bilaterally. The mandible formed 19.4% of impacted canines. Mesially and vertically angulated impacted teeth represented the majority of the cases for upper and lower jaws respectively. The impaction depth was recognized as D2 at the maxilla and D1 at the mandible as the commonest impaction level. Apical mislocation was presented in 21% of cases.</p><p><strong>Conclusion: </strong>The prevalence of impacted canines was 6.8%. Retained primary canines were associated with 76% of total impacted canines. About 32% of total maxillary impacted canines were associated with anomalous or missing lateral incisors.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"15"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12236999/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591431","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":"Prevalence of canine transmigration: Introducing a novel classification for mandibular canine transmigration.","authors":"Mahitha Mohan, S Babukuttan Pillai, G Sreejith Kumar","doi":"10.4103/jos.jos_111_24","DOIUrl":"10.4103/jos.jos_111_24","url":null,"abstract":"<p><strong>Objective: </strong>The aim of this study was to evaluate the prevalence of canine transmigration and impaction among patients at a tertiary dental health care center in India, using panoramic radiographs, and to introduce a novel classification system for mandibular canine transmigration.</p><p><strong>Materials and methods: </strong>A retrospective analysis of digital orthopantomograms (OPGs) of 30,000 patients above the age of 12 years, obtained from a tertiary dental health care center was conducted to assess the prevalence of canine transmigration and canine impaction.</p><p><strong>Results: </strong>A total of 30,000 OPGs were examined, revealing 341 transmigrated canines, with an overall prevalence of 1.1%. Transmigration was more common in the mandible (246 canines, 0.8%) than in the maxilla (95 canines, 0.3%), and slightly more prevalent in females, though not statistically significant. In the mandible, 235 cases were unilateral and 11 were bilateral. All maxillary cases were unilateral. The 246 transmigrated mandibular canines were categorized using the new MBS classification system: Group I (117), Group II (100), Group III (16), Group IV (2), and Group V (11).</p><p><strong>Conclusions: </strong>Canine impaction was more prevalent in the maxilla, whereas transmigration was more prevalent in the mandible. The MBS classification system showed the highest prevalence in Group I (oblique), followed by Group II, with the lowest in Groups III (vertical) and Group IV. This system provides a more detailed and clinically useful framework than previous classifications.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"14"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12236997/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591432","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":"Selection process for orthodontic program applicants in Saudi Arabia: A survey of program directors.","authors":"Suliman Alsaeed, Ghadah Albakran, Shug Albarrak, Eman Alnamnakani","doi":"10.4103/jos.jos_3_25","DOIUrl":"10.4103/jos.jos_3_25","url":null,"abstract":"<p><strong>Introduction: </strong>In recent years, Saudi Arabia has experienced a considerable increase in the yearly inflow of dentistry graduates. This has led to expectations of a corresponding increase in postgraduate study applications. Consequently, postgraduate program directors have been compelled to continuously refine their selection criteria, using a combination of objective and subjective measures. Despite the importance of the topic, very little research exists on the selection process for orthodontic programs. Moreover, no studies have been performed to investigate this process in Saudi Arabia. This study aims to describe the applicant selection criteria for orthodontic specialty programs in Saudi Arabia, offering insights from the perspectives of orthodontic program directors.</p><p><strong>Method: </strong>This study surveyed orthodontic program directors in Saudi Arabia to collect data on program operations, application details, the interview process, selection criteria, and demographic characteristics of program directors. A self-administered questionnaire, distributed through Google Forms, was used to collect responses. Statistical analyses included descriptive statistics and ranking of responses.</p><p><strong>Results: </strong>The majority of programs (75%) were located in hospitals, primarily in central and western Saudi Arabia. Interview ratings, class rank, and recommendation letters were the most influential factors in the selection process, with research experience and clinical attachments also playing an important role. Interviews were mandatory and typically lasted 15 min. Positive applicant characteristics included maturity, professional attire, and analytical thinking skills. Selection committees, composed of program directors and faculty members, held primary responsibility for admitting applicants.</p><p><strong>Conclusion: </strong>This study offers valuable insights for dentists aiming to apply for the Saudi Board of Orthodontics. Gaining a clear understanding of the selection criteria, prioritizing training in preferred orthodontic departments, and emphasizing research in orthodontics can improve applicants' chances. The findings aim to enhance the transparency and fairness of the selection process, ultimately strengthening orthodontic education in Saudi Arabia.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"27"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12236995/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591433","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":"Chin asymmetry perception among orthodontists, general dentists, and laypersons.","authors":"Prajwal Prabhu, G Shivaprakash, Afshan Saman Waremani, Ayush Dixit, B R Kavya, G Shivaprasad","doi":"10.4103/jos.jos_168_23","DOIUrl":"10.4103/jos.jos_168_23","url":null,"abstract":"<p><strong>Background: </strong>Contemporary society places a strong emphasis on the importance of facial esthetics. This perception of esthetics is inherently related to facial symmetry. Esthetics of soft tissues plays an important role in the selection of the therapeutic strategy; thus, the subjective evaluation of chin asymmetry is of great significance for clinical treatment.</p><p><strong>Aim: </strong>The objective of the study is to evaluate: 1. The degree of chin asymmetry on esthetics perception in frontal view and 2. To analyze the critical evaluation of chin asymmetry by dental professionals and laypersons with frontal facial photographs.</p><p><strong>Methodology: </strong>Chin asymmetries were analyzed through a series of edited frontal photographs of two subjects (male and female). The position of the chin was digitally altered from 0° (no alteration) to 6° (most severe alteration). Participants' responses were collected from laypersons (<i>n</i> = 100), general dentists (<i>n</i> = 50), and orthodontists (<i>n</i> = 51), and the photographs were graded according to esthetic appeal using a visual analog scale. Statistical analysis showed the diagnostic threshold levels for identifying chin asymmetries.</p><p><strong>Results: </strong>General dentists and laypersons showed similar threshold for diagnosing chin asymmetry in male and female subjects of 4°, whereas orthodontists could diagnose transverse chin asymmetry in male and female subjects at a 3° deviation. All the groups rated the 0° and 1° as the most attractive and 5° and 6° as the least attractive.</p><p><strong>Conclusions: </strong>Laypersons and general dentists had a relatively same accuracy in diagnosing transverse chin asymmetries in both female and male subjects, whereas orthodontists have relatively higher accuracy compared with other groups.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"19"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237000/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591485","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":"Finite element analysis of the transpalatal arch force systems activated in the Burstone geometries with different materials.","authors":"Zaid Dewachi, Lamiaa A Hasan, Mohammed N A Alrawi, Emad H K Alhajar","doi":"10.4103/jos.jos_49_24","DOIUrl":"10.4103/jos.jos_49_24","url":null,"abstract":"<p><strong>Aim of the study: </strong>This research paper was intended to quantify the stresses and the displacement distribution pattern released by Omega-loop transpalatal arch (TPA) activated in the Burstone geometries (II, III, and V) within two different materials.</p><p><strong>Materials and methods: </strong>Three-dimensional solid models of the maxilla and maxillary teeth were created using CBCT data for a 20-year-old man. A molar band and Omega-loop TPA were constructed. Force application was pretended virtually to geometry II, III, and V within stainless-steel and Armco β-titanium (TMA) (titanium-molybdenum-aluminum) material.</p><p><strong>Results: </strong>The schemes for stresses and the displacements were alike for both stainless-steel and TMA alloy Omega-loop TPAs. The stresses and displacements for the stainless-steel Omega-loop TPAs were higher than those for the TMA. Mesial tipping was seen in the unit with a large moment, distally in the opposite side. The highest displacement values were seen around the x-axis, which represent the tipping molar movement.</p><p><strong>Conclusions: </strong>This study results have shown that Omega-loop TPA can effectively derotate upper first molars. Anchorage reinforcement for the opposite molar should be kept in the orthodontist mind to avoid the unwanted movement as a result of the reactive forces for the active unit, especially when it is decided to use a high force to correct unilateral molar rotation.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"14 ","pages":"23"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12237008/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144591430","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}