Journal of Orthodontic Science最新文献

{"title":"Photographic Frankfort plane subnasale pogonion (FSA) angle for assessment of anteroposterior discrepancies in malocclusion subjects: A prospective study.","authors":"R Rebekah,&nbsp;Ravindra Kumar Jain,&nbsp;Arthi Balasubramaniam,&nbsp;Swapna Sreenivasagan","doi":"10.4103/jos.jos_7_23","DOIUrl":"10.4103/jos.jos_7_23","url":null,"abstract":"<p><strong>Introduction: </strong>Anterior-posterior discrepancy assessment is a crucial component of orthodontic diagnosis and is often carried out using hard tissue cephalometric analysis. The purpose of this study was to compare the photographic Frankfort plane subnasale pogonion (FSA) angle with established cephalometric parameters to determine the accuracy of the angle in determining maxillomandibular anteroposterior discrepancies.</p><p><strong>Materials and methods: </strong>In this prospective study, a total of 60 subjects, 20 in each skeletal sagittal malocclusion, were included in the final sample based on the selection criteria. Both photographic and cephalometric records were taken, and the parameters assessed were the beta angle, Steiner's analysis, the ANB (A point- Nasion- B point) angle in the cephalograms, and the FSA angle in the profile photographs. Statistical analysis was done with SPSS software. The correlation between the measured parameters was assessed using Pearson's correlation test.</p><p><strong>Results: </strong>A high positive and significant correlation between the FSA angle and beta angle (r = 0.793) was noted, and a high negative and significant correlation between the FSA angle and ANB angle (r = -0.848) was noted.</p><p><strong>Conclusion: </strong>The photographic FSA angle can be used as a reliable parameter to diagnose anteroposterior discrepancies.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"57"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/2e/d8/JOS-12-57.PMC10597371.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50161945","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":"Chronodentistry through orthodontic perspective: A literature review.","authors":"K Gauthami,&nbsp;Crystal R Soans,&nbsp;Shamyuktha Krishnamurthy,&nbsp;M S Ravi","doi":"10.4103/jos.jos_2_23","DOIUrl":"10.4103/jos.jos_2_23","url":null,"abstract":"<p><p>The human body possesses a unique set of machinery called the molecular/biological clocks that function on a regular 24-h basis forming a circadian rhythm (CR). This aids in coordinating the human biological system with ever-changing environmental conditions, thereby maintaining a balance in its functioning. The central/core component of this system is known to be in the suprachiasmatic nucleus of the hypothalamus with a few aides in the periphery. The periodontal ligament in humans, being one of the dynamic oral tissues, has been shown to exhibit this self-sustained, innate oscillatory behavior that has gained significant attention from dental surgeons. Though substantial evidence regarding its precise role in maintaining circadian periodicity is still unclear, its indispensable role in dentofacial functioning cannot be denied. This review is an attempt in bringing to light the possible role of circadian periodicity in the functioning of oral tissues in the field of orthodontics with a special focus on its role in bone remodeling, orthodontic tooth movement, orthopedic and functional appliances, pain management, and their clinical implications. This could provide a better understanding of the various physiologic and pathologic processes and help us refine our approach toward orthodontic diagnosis and therapeutics. This review would therefore serve as an overview, opening more avenues for further research on this topic that can greatly help the orthodontic fraternity.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"36"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/b0/4d/JOS-12-36.PMC10597354.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50161934","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":"The effect of ceramic surface conditioning on bond strength of metallic brackets: An <i>in vitro</i> study.","authors":"Rita Ferreira,&nbsp;Pedro Mariano Pereira,&nbsp;Ricardo Pitschieller,&nbsp;Luis Proença,&nbsp;Iman Bugaighis","doi":"10.4103/jos.jos_79_22","DOIUrl":"10.4103/jos.jos_79_22","url":null,"abstract":"<p><strong>Objective: </strong>To compare the shear bond strength (SBS) of brackets bonded to three different types of ceramic surfaces (feldspathic ceramic, lithium disilicate ceramic, and zirconia), conditioned with either hydrofluoric acid or sandblasting, using Assure^® Plus All bonding agent.</p><p><strong>Materials and methods: </strong>A total of 72 monolithic CAD/CAM ceramic specimens were divided into six groups of 12 samples. Three groups (G1: feldspathic ceramic, G3: lithium disilicate ceramic, G5: zirconia surfaces) were conditioned with 9.6% hydrofluoric acid, while the remaining three (G2, G4, G6; with ceramic type in the same order as the previous three groups) were prepared with 50 μm aluminum oxide sandblasting. Premolar brackets were bonded using light-cured Assure^® Plus All. The SBS and adhesive remnant index (ARI) were recorded and submitted to inferential analysis using one-way analysis of variance and Kruskal-Wallis tests, respectively. The significance level was set at 5% (<i>P</i> ≤ 0.05).</p><p><strong>Results: </strong>The mean SBS values for the three different ceramic groups conditioned with hydrofluoric acid (G1: 7.2 ± 1.5 MPa, G3: 9.3 ± 2.3 MPa, G5: 8.5 ± 2.0 MPa) were significantly higher than those obtained for the groups prepared by sandblasting before bonding (G2: 7.5 ± 1.8 MPa, G4: 4.4 ± 2.0 MPa, G6: 4.3 ± 2.8 MPa).</p><p><strong>Conclusions: </strong>The hydrofluoric acid treatment produced a favorable SBS for all three examined ceramic types before bracket bonding with Assure^® Plus All. In comparison, sandblasting yielded a satisfactory SBS only with feldspathic surfaces. Furthermore, the ARI indicated a higher frequency of mixed-adhesive failures except for lithium disilicate conditioned with sandblasting. Therefore, using hydrofluoric acid is likely to be especially recommended when the clinician is not aware of the brand of ceramic restorative material.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"42"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c3/46/JOS-12-42.PMC10597357.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50161953","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":"Shear strength of metal brackets using LED lamps with different wavelengths: An <i>in vitro</i> comparative study.","authors":"Franco Mauricio,&nbsp;Julia Medina,&nbsp;Cesar Mauricio-Vilchez,&nbsp;Luzmila Vilchez,&nbsp;Roman Mendoza,&nbsp;Frank Mayta-Tovalino","doi":"10.4103/jos.jos_15_23","DOIUrl":"10.4103/jos.jos_15_23","url":null,"abstract":"<p><strong>Aim: </strong>To evaluate the shear strength of Orthocem and BracePaste polymerizable cement light-cured with light-emitting diode (LED) units with different wavelengths (Bluephase N) with their high power, low power, and soft start programs in the bonding of metal brackets.</p><p><strong>Materials and methods: </strong><i>In vitro</i> experimental research was performed. Mini Roth 0.022 metal brackets (Roth Orthometric brackets) were used. The adhesives were placed on the metal brackets with Orthocem and BracePaste resin cement. To compare the average strengths, the analysis of variance (ANOVA) test was used (<i>P</i> < 0.05).</p><p><strong>Results: </strong>The average shear strength was better with Bracepaste polymerizable cement compared to Orthocem cement in all its high power, low power, and soft star programs; the highest was Bracepaste with soft start of 26.52 MPa, and the lowest was Orthocem with soft start of 13.92 MPa. When evaluating the differences, it was found that these were statistically significant in all groups (<i>P</i> < 0.05).</p><p><strong>Conclusions: </strong>Differences were found in the shear strength of light-curing Orthocem and Bracepaste light-curing cement cured with LED units with different wavelengths in bonding metal brackets to the tooth <i>in vitro</i>.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"47"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/98/1b/JOS-12-47.PMC10597364.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50161950","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":"A comparison of the quadhelix and the nickel-titanium palatal expander in the treatment of narrow maxillary arches: A prospective clinical study.","authors":"Ameet Vaman Revankar, Sagar S Bhat, Joe E Rozario","doi":"10.4103/jos.jos_29_22","DOIUrl":"10.4103/jos.jos_29_22","url":null,"abstract":"<p><strong>Objectives: </strong>The study aimed to compare the effects of quadhelix and nickel-titanium (NiTi) expander appliances on lower facial height, to quantify, and evaluate dentoalveolar and orthopedic changes in transverse plane, respectively, to estimate the difference in changes between these two appliances.</p><p><strong>Materials and methods: </strong>Twenty patients, ten for the quadhelix and NiTi expander in the two-appliance group, respectively, participated in this study. A total of 8 readings, 1 for clinical facial height, 2 for model analysis, and 5 for posteroanterior cephalometric analysis were recorded. The statistical tests used were, Student's unpaired and paired t-tests.</p><p><strong>Results: </strong>Both appliances individually, produced statistically highly significant (<i>p</i> < 0.01) expansion every month in both premolar and molar areas with more uniform expansion for quadhelix and less expansion in NiTi palatal expander in the premolar region initially. The skeletal to dental change ratio showed that there was more dental change than skeletal with no inter-appliance differences statistically while assessing the PA cephalometric readings.</p><p><strong>Conclusions: </strong>This study infers that both appliances are equally efficacious maxillary expanders, which are primarily dentoalveolar and not skeletal (<i>p</i> < 0.05).</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"8"},"PeriodicalIF":0.0,"publicationDate":"2023-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/09/57/JOS-12-8.PMC10282519.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9704158","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":"The COVID-19 experience of orthodontists in Jordan.","authors":"Yana Sabbagh, Stephen M Chadwick, Benjamin R K Lewis, Elham S Abu Alhaija","doi":"10.4103/jos.jos_48_22","DOIUrl":"10.4103/jos.jos_48_22","url":null,"abstract":"<p><strong>Objectives: </strong>To understand the impact of the COVID-19 pandemic on orthodontic clinical services in Jordan.</p><p><strong>Materials and methods: </strong>Google Forms electronic questionnaires were distributed between March and June 2021 using the WhatsApp platform of the Jordanian Orthodontic Society and via direct WhatsApp messages. The survey was identical and contemporaneous to that used in the United Kingdom.</p><p><strong>Results: </strong>The survey yielded 127 unique responses, giving a response rate of 53.1%. The factors that had the greatest impact on service delivery were government guidance (78%), patients' fear of attending (70.1%), and increased cross-infection measures (65.4%). The survey revealed that there had been a perceived deterioration in oral hygiene (60.3%) and levels of compliance (61.9%) in patients in active treatment even though patients in treatment were prioritized during the pandemic. Also, 56.8% of respondents felt clinical staff should be vaccinated and undergo regular testing for COVID-19. Orthodontists within Jordan were optimistic regarding the speed at which clinical services would return to pre-pandemic levels of activity with 32.5% anticipating this would take less than 6 months.</p><p><strong>Conclusions: </strong>Patients in active orthodontic treatment, during COVID-19, have been prioritized but at the expense of new and review patients. Respondents in Jordan felt COVID-19 would have ongoing effects on clinical care, professional practice, and society. Most respondents supported the vaccination of orthodontic staff and were optimistic about the effect of a vaccination program on restoring clinical services.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"10"},"PeriodicalIF":0.0,"publicationDate":"2023-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/e8/ab/JOS-12-10.PMC10282514.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10089663","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":"The prevalence of Brodie bite in untreated orthodontic patients in Nigeria.","authors":"Idia N Ize-Iyamu,&nbsp;Joseph N Otaren","doi":"10.4103/jos.jos_34_22","DOIUrl":"https://doi.org/10.4103/jos.jos_34_22","url":null,"abstract":"<p><strong>Objective: </strong>The Brodie bite (BRB) is a rare posterior crossbite affecting the transverse occlusal relationship with the palatal cusps of the upper molars, biting into the vestibule and outside the buccal cusps of the lower molar teeth. The BRB is a highly challenging orthodontic problem and is an extreme form of scissors bite. Patients with this problem present with facial deformity and inability to chew on the affected side. The problem is usually not identified until it becomes severe. This study aimed to identify the prevalence of BRB among untreated orthodontic patients in two geo-political zones in Nigeria.</p><p><strong>Methods: </strong>A total of 1,041 untreated orthodontic patients who presented to two different orthodontic centres located in two geo-political zones (South/South-Benin City and North Central-Abuja, Nigeria) over a 3-year period were evaluated for the presence of BRB. The transverse dimension of the occlusion was examined for the presence of a crossbite or scissors bite. The molar teeth were used as the reference point for occlusion with Angle's classification of malocclusion. Four groups were identified, namely, teeth in occlusion (TIO) (Angle's Classes I, II or III malocclusion served as the control group), scissors or lingual crossbite (LCB), buccal crossbite (BCB) and BRB. A posterior crossbite was confirmed when the upper molar teeth were biting outside the buccal groove of the lower molar teeth either lingually or buccally. A BRB was identified when the palatal cusps of the upper molars were biting into the buccal vestibule of the lower jaw, with the deviation of the face to that side. Statistical analyses were performed using SPSS version 21; frequencies were determined for the variables, and cross-tabulations between the variables were established. <i>P</i> values < 0.05 were considered significant.</p><p><strong>Results: </strong>The overall prevalence of BRB in this study was 0.6% (six patients). The values in the South/South (Benin City) were 997 untreated orthodontic patients, with a prevalence of 0.5% (five patients). The North Central (Abuja) zone had a total of 44 untreated orthodontic patients, with a prevalence of 2.3% (one patient). Unilateral BRB was seen in five patients (80%), and bilateral BRB was seen in one patient (20%). The condition was more prevalent among women (four patients, 80%) and on the right side (three patients, 60%). Angle's relationship in Classes I, II and III (TIO or control group) was seen in 911 patients (87.5%). The LCB and BCB groups comprised 39 (3.8%) and 85 patients (8.1%), respectively. Posterior crossbite was seen in 130 patients (12.5%).</p><p><strong>Conclusion: </strong>The prevalence of BRB in this study was found to be 0.6%, with the condition being more prevalent in women and on the right side.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"2"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/34/ae/JOS-12-2.PMC10282511.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9704160","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 mesio-distal dilaceration in patients presenting for initial orthodontic care: A retrospective study.","authors":"Abubaker Qutieshat,&nbsp;Nutayla Al Harthy,&nbsp;Shahab Javanmardi,&nbsp;Gurdeep Singh,&nbsp;Viresh Chopra,&nbsp;Rayhana Aouididi,&nbsp;Omar Al Hanashi,&nbsp;Abdulghani Al Arabi","doi":"10.4103/jos.jos_75_22","DOIUrl":"https://doi.org/10.4103/jos.jos_75_22","url":null,"abstract":"<p><strong>Objective: </strong>To determine the prevalence of dilaceration in a sample of patients presenting for initial orthodontic care.</p><p><strong>Methods: </strong>Examining radiographs from a random sample of orthopantomogram images was used to acquire the data. In all, 2,801 dental records were evaluated at Oman Dental College (ODC), Oman. A dental X-ray processing software was utilized to view the images. A tooth was classified as having a mesial/distal dilaceration if its long axis exhibited an angle of 90 degrees or greater. Dilacerated roots in the buccal/lingual direction were diagnosed by observing the appearance of a spherical opaque area with a dark shadow in its central region, projected by the apical foramen, which gave the root canal a \"bull's-eye\" appearance.</p><p><strong>Results: </strong>Dilacerations were found in 17.32% of the records examined. The maxillary second molars (22.71%) were the most commonly affected, followed by the mandibular third molars and mandibular lateral incisors (21.90% and 17.23%, respectively). The central incisors and canines were the least affected, with dilaceration affecting less than 0.2% of the teeth. The mandible was found to have more dilacerations than the maxilla (53.78% and 46.22%, respectively). 61.03% of dilacerations occurred in molars, 43.12% of which occurred in third molars.</p><p><strong>Conclusion: </strong>Dilaceration is a notable dental anomaly that can affect any tooth, with some teeth being more affected than others. Dilaceration in maxillary second molars and mandibular lateral incisors is more common in the population of this study than in other populations reported in the literature. Recognizing the condition will allow for more effective orthodontic treatment.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"13"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/90/f0/JOS-12-13.PMC10282518.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9712344","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":"MH-SETUP, combining Kesling wax-setup with indirect bonding and custom-made brackets for labial/lingual techniques to eliminate the finishing phase.","authors":"Mohamed A Elkolaly,&nbsp;Hasan Sabah Hasan","doi":"10.4103/jos.jos_60_22","DOIUrl":"https://doi.org/10.4103/jos.jos_60_22","url":null,"abstract":"<p><strong>Objective: </strong>A novel technique, named the MH setup (MH is an abbreviation for the author's name), was developed to provide an accurate yet simplified method to produce custom-made brackets without bonding errors. This setup aimed to simplify the treatment and eliminate the finishing phase, so that the orthodontist was able to provide better care with less time and lower costs.</p><p><strong>Materials and methods: </strong>The setup was performed in two major steps: direct bonding on the cast followed by cutting and setting the teeth into precise positions using brackets. The first set of brackets, bonded directly onto casts, oriented the teeth by setting them ideally into wax rims with full control over first-, second-, and third-order bends. The fully engaged archwire used allowed for precise control over the arch symmetry and form. Setting teeth in wax allowed the clinician to refine the occlusion and correct any minor errors that arose during the initial bonding. The second set of brackets, mounted on the fully engaged archwire, featured custom-made composite bases. The transfer tray combined the benefits of its soft inner and hard outer layers, providing control over bonding and later ease of peeling from the brackets.</p><p><strong>Results: </strong>The patient was satisfied with a full bonding procedure lasting 15 min that remained simple without unnecessary stress. The clinician was confident that the procedure allowed the precise positioning of brackets and simple bonding for all teeth in the arch, combined with the elimination of the finishing phase.</p><p><strong>Conclusion: </strong>The MH technique offered a simple, precise, and inexpensive improvement to the Kesling wax setup. The process allowed for precise bonding without errors or expensive armamentarium. The brackets were transformed into custom-made prescriptions and could be used with labial or lingual techniques. The method allowed for teeth addition, trimming, or overcorrection according to the clinician's preferences. The MH setup facilitated visualization of the treatment objectives with precise locations and the opportunity to revise the treatment plan or to discuss further options with the patient.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"11"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/0c/38/JOS-12-11.PMC10282520.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9712345","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 mandibular asymmetry in different skeletal malocclusions and vertical patterns in adult individuals: A cone-beam computed tomography study.","authors":"Nora Alhazmi","doi":"10.4103/jos.jos_112_22","DOIUrl":"https://doi.org/10.4103/jos.jos_112_22","url":null,"abstract":"<p><strong>Objectives: </strong>The study aims to measure the mandibular condylar height (CH), ramus height (RH), total height (CH+RH), asymmetry index, and condylar volume (Cvol) in individuals with different anteroposterior and vertical skeletal discrepancies.</p><p><strong>Materials and methods: </strong>The study sample consisted of 131 subjects (60 females and 71 males) with a mean age of 35.06 ± 12.79 years. Pre-existing CBCT images were divided into groups according to the anteroposterior and vertical skeletal discrepancies. The investigator analyzed the data using t-tests to assess the mandibular bilateral sides of the individuals and gender differences. The mean difference between groups was determined using a one-way analysis of variance (ANOVA). The Chi-square test was used to study the association between the asymmetry index and groups.</p><p><strong>Results: </strong>Each individual's bilateral sides exhibited statistically significant differences in CH, RH, and Cvol (<i>P</i> = 0.033, <i>P</i> = 0.039, <i>P</i> = 0.005, respectively), but not in CH+RH (<i>P</i> = 0.458). There were, however, statistically significant gender differences in CH+RH (<i>P</i> < 0.001). Skeletal Class III and hypodivergent groups revealed the highest linear and volumetric values compared to other groups. The asymmetry index was increased in CH (<i>P</i> = 0.006) and Cvol (<i>P</i> = 0.002) in skeletal Class II subjects.</p><p><strong>Conclusions: </strong>Significant differences in CH, RH, and Cvol were found on the right and left sides of the same individual. This study found increased linear and volumetric values in males, skeletal Class III, and hypodivergent subjects. Class II individuals had an increased CH and Cvol asymmetry index. This study highlights in-depth knowledge of mandibular asymmetry, which is extremely important to achieve an accurate diagnosis and provide the best treatment outcome.</p>","PeriodicalId":16604,"journal":{"name":"Journal of Orthodontic Science","volume":"12 ","pages":"33"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/cd/bf/JOS-12-33.PMC10282567.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9712348","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}