Turkish Journal of Orthodontics最新文献

{"title":"20-Year Change in the Perception of Orthodontic Treatment: A Cross-Sectional Study.","authors":"Mehmet Ali Yavan,&nbsp;Merve Nur Eğlenen","doi":"10.5152/TurkJOrthod.2022.21002","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21002","url":null,"abstract":"<p><strong>Objective: </strong>To compare the changes in the perception towards orthodontics between the first and second decades over the 20-year period based on a collaborative hypertext dictionary site.</p><p><strong>Methods: </strong>The orthodontics-related entries were searched on the EksiSozluk website (http://www.eksisozluk.com). The keyword was determined as \"diş teli\" (\"brace\") and a total of 1,028 entries that were contributed between 2001 and 2021 were analyzed. Entries were divided into five general categories based on their content: definition, asking for advice, humor, advertising, and transfer of experience. The transfer of experience category was further divided into four subcategories: procedure, motivation, advice, and complaint. For each entry, the attitude of the contributor was also noted. Entries were compared between the two decades with regard to content and attitude towards orthodontics.</p><p><strong>Results: </strong>The average number of entries contributed per year was 13.40 ± 10.58 in the first decade and was 89.40 ± 44.67 in the second decade, the increase was statistically significant (P < .05). A significant difference was observed between the two decades in terms of content (P < .05). There was a proportional decrease in the definition and an increase in the transfer of experience. Moreover, the rate of entries containing a complaint decreased and motivation increased in the second decade (P < .05). On the other hand, there was also a significant change between the two decades with regard to the distribution of attitudes, whereby the rate of positive entries increased in the second decade (P < .05).</p><p><strong>Conclusion: </strong>The contributors' attitudes towards orthodontics shifted from negative in the first decade to positive in the second decade.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"276-283"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885835/pdf/tjo-35-4-276.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10670621","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":"Vacuum-Formed Retainers Versus Lingual-Bonded Retainers: A Systematic Review and Meta-Analysis of Stability of Treatment Outcomes in Orthodontically Treated Patients.","authors":"Seerab Husain,&nbsp;Shantha Sundari,&nbsp;Ravindra Kumar Jain,&nbsp;Arthi Balasubramaniam","doi":"10.5152/TurkJOrthod.2022.21169","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21169","url":null,"abstract":"<p><strong>Objective: </strong>This review aimed at analyzing the literature comparing vacuum-formed retainers and lingual-bonded retainers for maintaining treatment stability and periodontal health and evaluating retainer failure and patient satisfaction.</p><p><strong>Methods: </strong>Electronic databases such as PubMed, Cochrane Library, Ovid, Scopus, Web of Science, and Google Scholar were searched. Only randomized controlled trials were involved. Risk of bias was evaluated using Risk of Bias 2 Tool. Meta-analysis was performed and certainty of evidence was assessed with Grading of Recommendations Assessment, Development, and Evaluation approach.</p><p><strong>Results: </strong>Five randomized controlled trials were included for qualitative analysis and 2 studies were included for quantitative analysis. Two studies concluded that lingual-bonded retainers were more effective than vacuum-formed retainers in maintaining treatment stability. Two studies had a high risk of bias and 3 studies had some concerns. No statistically significant difference in Little's Irregularity Index (standard mean difference = -0.10; P value = .61), inter-canine width (standard mean difference = 0.66; P value = .09), inter-molar width (standard mean difference = 0.08; P value = .85), arch length (standard mean difference = -0.18; P value = .60) between the 2 retainers was noted. Periodontal status and retainer failure rate (odds ratio= 2.28; P value = .23) were similar in both retainers. Patient discomfort, soreness, and speech difficulty were more with vacuum-formed retainers and oral hygiene maintenance was easier with vacuum-formed retainers.</p><p><strong>Conclusion: </strong>A very low-level certainty of evidence suggests that both vacuum-formed retainers and lingual-bonded retainers were equally effective in maintaining treatment stability. Periodontal status and retainer failures were similar in both retainers. Vacuum-formed retainers were better for oral hygiene maintenance but were associated with discomfort, soreness, and speech difficulty than lingual-bonded retainers.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"307-320"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885829/pdf/tjo-35-4-307.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10664635","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":"Changes in Orbicularis Oris Superior and Masseter Muscle Activities After Upper Incisor Protrusion in Class II Division 2 Malocclusion: An Electromyographic Study.","authors":"Irmak Ocak,&nbsp;Abdullah Ruhi Soylu,&nbsp;Müge Aksu","doi":"10.5152/TurkJOrthod.2022.21001","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21001","url":null,"abstract":"<p><strong>Objective: </strong>This prospective study aimed to evaluate the orbicularis oris superior and masseter muscle activity changes after upper incisor protrusion in CII/2 malocclusion.</p><p><strong>Methods: </strong>A total of 20 patients (mean age 10.29 ± 0.90 years) with CII/2 malocclusion were selected for the study group. A total of 15 patients (mean age 10.56 ± 1.06 years) with Angle Class I malocclusion were recruited as control. Upper incisors were protruded with utility arch in the study group. Muscle activities were evaluated with Biopac MP150 surface electromyography device before and after upper incisor proclination and at the 6-month retention. Orbicularis oris superior and left-right masseter muscles were recorded during rest electromyography and maximum contraction electromyography. Repeated measures and two-way repeated-measures analysis of variance with Bonferroni correction were used for statistical analysis.</p><p><strong>Results: </strong>A significant change occurred over time in orbicularis oris superior (P < 0.001), left masseter (P < 0.01) and right masseter (P < 0.05) maximum contraction electromyography in the CII/2 group. However, a significant difference was not found between groups P > 0.05. In the CII/2 group, orbicularis oris superior maximum contraction electromyography value was increased after upper incisor protrusion and this increase remained stable. Left masseter and right masseter maximum contraction electromyography measurements were decreased after protrusion and then increased after retention significantly. Rest electromyography values for all muscles were not statistically significant. No significant differences with the control group were found.</p><p><strong>Conclusion: </strong>Upper incisor protrusion increased orbicularis oris superior activity and the increase remained stable after retention. Masseter activities decreased after protrusion and then increased to the initial values. These changes did not show significant differences with the control group.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"231-238"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885802/pdf/tjo-35-4-231.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10670617","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 Correlation Between Morphologic Characteristics of Condyle and Glenoid Fossa with Different Sagittal Patterns of Jaw Assessed by Cone-Beam Computed Tomography.","authors":"Navid Kariminasab,&nbsp;Zahra Dalili Kajan,&nbsp;Arefeh Hajian-Tilaki","doi":"10.5152/TurkJOrthod.2022.21136","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21136","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to determine the relationship between the morphologic characteristics of condyle and glenoid fossa in different sagittal skeletal patterns using cone-beam computed tomography.</p><p><strong>Methods: </strong>In this cross-sectional study, the lateral cephalometric and cone-beam computed tomography images of 90 patients were evaluated. The patients were categorized into three equal groups of sagittal skeletal patterns, according to the ANB angle. The greatest anteroposterior and mediolateral diameters of the mandibular condyles, as well as the angle between the long axis of the mandibular condyles and the midsagittal plane, were measured on the axial view of cone-beam computed tomography images. The anterior joint space, superior joint space, posterior joint space, articular eminence inclination, depth of the glenoid fossa, and width of the glenoid fossa were also measured on the central sagittal slices. One-way analysis of variance (ANOVA), Tukey's post hoc test and chi-square test were performed.</p><p><strong>Results: </strong>Patients with the skeletal Class III had a significantly higher articular eminence inclination, while Class II patients had a lower articular eminence inclination (P = .001). In Class III patients, the depth of the glenoid fossa was greater, and the width of the glenoid fossa was smaller than in the other groups (P < .01). The anterior and posterior joint space did not show any significant differences between the 3 groups.</p><p><strong>Conclusion: </strong>There were significant differences in some morphological characteristics of the condyle and glenoid fossa in patients with different sagittal skeletal patterns; therefore, this relationship should be considered in the treatment of these patients.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"268-275"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885781/pdf/tjo-35-4-268.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10670619","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 Tie Wing Fracture Resistance of Differing Ceramic Brackets.","authors":"Mary Kate James,&nbsp;Qingzhao Yu,&nbsp;Htwe Mon,&nbsp;Xiaoming Xu,&nbsp;Alli Blanchard,&nbsp;Paul Armbruster,&nbsp;Richard W Ballard","doi":"10.5152/TurkJOrthod.2022.21209","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21209","url":null,"abstract":"<p><strong>Objective: </strong>The aim of this study was to compare the tie wing fracture resistance of 4 different manufacturers' ceramic brackets currently on the market.</p><p><strong>Methods: </strong>The tie wings of ceramic brackets from 4 manufacturers were tested with 10 samples in each group. The brackets were Ormco Symetri, 3M Clarity, American Radiance Plus, and Dentsply Ovation S. The brackets were mounted and fixed in a universal testing machine. A stainless steel ligature wire was looped around a tie wing and the mean tensile strength was both tested and recorded.</p><p><strong>Results: </strong>There was a significant overall difference in tensile strength among the 4 groups (P < .0001) with the 3M Clarity brackets having the highest MPa. When the groups were compared to each other, they also showed a significant difference in mean tensile strength with the exception being the American Radiance Plus and Ormco Symetri brackets.</p><p><strong>Conclusion: </strong>Test results concluded that the 3M Clarity brackets had the highest resistance to tie wing fracture, while the Dentsply Ovation S brackets had the lowest resistance.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"255-259"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885830/pdf/tjo-35-4-255.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10670618","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 Perception of Adults and Adolescents of Undergoing and Paying for Tooth Movement Acceleration Procedures in Turkey.","authors":"Tuğba Haliloğlu Özkan,&nbsp;Derya Dursun","doi":"10.5152/TurkJOrthod.2022.21256","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21256","url":null,"abstract":"<p><strong>Objective: </strong>The aim of this study is to evaluate the opinions of adolescents and adults regarding nonconventional methods and their associated payment options in Turkey.</p><p><strong>Methods: </strong>A total of 183 subjects were asked to complete a questionnaire to evaluate their perception of various nonconventional acceleration methods: corticotomy, piezocision, micro-osteoperforation, vibration, drug injection, and customized appliances. The questionnaire also investigated how willing the patients would be to pay more and how much more they would accept to reduce the treatment time.</p><p><strong>Results: </strong>About 38.7% of the adolescents and 44.4% of the adults were willing to undergo an additional procedure, and 59.6% of both groups chose customized appliances as their first preference as a way of accelerating the treatment process. About 45.4% of the total participants were neutral about paying more to reduce treatment time. Those patients who were willing to pay more accepted a maximum increase of only 10% even if that meant a 50% decrease in treatment time.</p><p><strong>Conclusion: </strong>Adults were slightly less tolerant of the duration of orthodontic treatment than adolescents and were more likely to undergo additional procedures and pay more for a shorter treatment time. In addition, the invasiveness of each procedure was the primary factor given when choosing an acceleration method, rather than its reduction rate.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"284-289"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885811/pdf/tjo-35-4-284.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10664636","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":"Adaptive Changes in the Posterior Pharyngeal Wall Following Large Retraction of Incisors During Comprehensive Orthodontic Treatment.","authors":"Ashok Kumar Jena,&nbsp;Venkatachalapathy Anusuya,&nbsp;Jitendra Sharan","doi":"10.5152/TurkJOrthod.2022.21157","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21157","url":null,"abstract":"<p><strong>Objective: </strong>To evaluate the effects of large retraction of incisors on the adaptive changes in the posterior pharyngeal wall and soft palate during comprehensive orthodontic treatment.</p><p><strong>Methods: </strong>Twenty-seven females with Class I mild crowding or spacing who required non-extraction treatment (group I) and 34 females with Class I bimaxillary dentoalveolar protrusion who required all first premolars extraction for the retraction of their incisors (group II) were included in the study. The effects of non-extraction and incisor retraction following all first premolars extraction orthodontic treatment on the sagittal dimensions of pharyngeal airway passage and posterior pharyngeal wall thickness were evaluated from pre- and post-treatment cephalograms.</p><p><strong>Results: </strong>The dimensions of pharyngeal airway passage were comparable among the groups. The length of the soft palate increased (P < .01) and the thickness of the soft palate decreased (P < .01) following retraction of incisors, and the difference between the groups was significant (P < .05). The posterior pharyngeal wall thickness was reduced significantly at PPWT2 (P < .05), PPWT3 (P < .001), PPWT4 (P < .001), PPWT5 (P < .001), and PPWT6 (P < .01) regions following retraction of the incisors, and the difference between the groups was statistically highly significant.</p><p><strong>Conclusions: </strong>The large retraction of incisors during comprehensive orthodontic treatment in Class I bimaxillary dentoalveolar protrusion malocclusion subjects did not affect the sagittal dimensions of pharyngeal airway passage, but the thickness of the posterior pharyngeal wall reduced significantly as an adaptation to maintain the patency of the upper airway.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 4","pages":"248-254"},"PeriodicalIF":1.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885820/pdf/tjo-35-4-248.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10670620","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":"Comparative Evaluation of Soft Tissue Profile Changes with Herbst and Twin Block Appliances in Class II Malocclusion Patients: A Perception Study.","authors":"Annapurna Kannan,&nbsp;Sridevi Padmanabhan","doi":"10.5152/TurkJOrthod.2022.21072","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21072","url":null,"abstract":"<p><strong>Objective: </strong>To comparatively evaluate the perception of patients' soft tissue profiles treated with Herbst and Twin Block appliances and correlate the perception with cephalometric parameters.</p><p><strong>Methods: </strong>The record of 30 patients (15 Herbst and 15 Twin Block) treated for a period of 6 months (±1.1 months) was included in the study. A total of 60 resulting profile silhouettes (from pre- and post-functional profile photographs) were evaluated by 30 examiners and were divided into 3 groups: orthodontists, general dentists, and laypersons. The profiles were arranged in a randomized order, and the examiners rated the profiles using a visual analog scale. Paired t-test and independent t-test were performed to find a significant difference within and between the appliances, respectively. A treatment outcome correlation was done using Pearson's correlation test between the visual analog scale scores and cephalometric parameters.</p><p><strong>Results: </strong>Within the appliances, the orthodontist perceived a difference with only the Twin Block appliance (P = .02). The general dentists perceived a significant difference with both Herbst (P = .02) and Twin Block (P = .001) appliances, whereas the laypersons did not perceive any profile improvement on treatment with functional appliances. However, between the appliances, no statistically significant profile difference was seen with all 3 groups of examiners. The ANB angle had a significant negative correlation (P = .007) to the visual analog scale scores given by the orthodontists for the Herbst appliance.</p><p><strong>Conclusion: </strong>No perceptible difference was found in the profile enhancement between Herbst and Twin Block appliances with all 3 groups of examiners. The ANB angle contributed to the difference in profile perception between the appliances for the orthodontists.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":" ","pages":"173-179"},"PeriodicalIF":1.1,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9623219/pdf/tjo-35-3-173.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40343247","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":"Nickel Release and the Viability of Streptococcus mutans Corresponding to Low Risk of Dental Caries in Artificial Saliva Containing Orthodontic Appliances: In Vitro Study.","authors":"Serap Titiz,&nbsp;Zalike Keskin Erdoğan,&nbsp;Elif Esin Hames Tuna,&nbsp;Aynur Aras","doi":"10.5152/TurkJOrthod.2022.21142","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21142","url":null,"abstract":"<p><strong>Objective: </strong>The aims of this study were to determine the effect of different levels of Streptococcus mutans that correspond to a low risk of dental caries on nickel release and to determine the viability of S. mutans.</p><p><strong>Methods: </strong>Simulated fixed orthodontic appliances composed of copper nickel titanium, nickel titanium, or stainless steel were immersed in Klimek artificial saliva for 10 days with or without S. mutans inoculation on day 7. Same levels of S. mutans cultures (4 × 104 cfu/mL) were inoculated into the artificial saliva without orthodontic appliances. Nickel release was detected by inductively coupled plasma mass spectrometry. The archwire surface was analyzed by atomic force microscopy and scanning electron microscopy.</p><p><strong>Results: </strong>The density of S. mutans significantly increased in the artificial saliva without orthodontic appliances (P < .05). Appliances with nickel titanium alloys showed higher nickel release in the artificial saliva with or without S. mutans than those with copper nickel titanium or stainless steel archwires (P < .05). However, S. mutans increased nickel release only in orthodontic appliances with stainless steel archwires (P < .05). Although atomic force microscopy showed that the surface of as-received stainless steel archwires was smoother than that of nickel titanium or nickel titanium archwires, S. mutans increased the surface roughness of only the SS archwires. S. mutans adhered to all archwire types.</p><p><strong>Conclusion: </strong>While corrosion or corrosion-related processes may have decreased the growth capacity of S. mutans, reciprocally, S. mutans influenced corrosion. Rough surfaces can also promote corrosion; therefore, the surface roughness of metal alloy orthodontic appliances should be evaluated to determine their corrosion behavior.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 3","pages":"157-165"},"PeriodicalIF":1.1,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9623342/pdf/tjo-35-3-157.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33481406","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":"Changes in Angulation and Eruption Space of Developing Mandibular Third Molars Following Twin Block Treatment.","authors":"Hanem Younes Elfeky,&nbsp;Engy Ali Abdelhaleem Salam,&nbsp;Fouad Aly El Sharaby","doi":"10.5152/TurkJOrthod.2022.21122","DOIUrl":"https://doi.org/10.5152/TurkJOrthod.2022.21122","url":null,"abstract":"<p><strong>Objective: </strong>The aim of this study was to assess the effects of twin block functional appliance three dimensionally on mandibular third molars angulation and eruption space.</p><p><strong>Methods: </strong>This retrospective study included cone beam computer tomography (CBCTs) of 34 Class II females (11.84 ± 0.94 years) who were divided into 2 groups. The first group received a standard twin block appliance (intervention group), while the other was considered as a control. CBCT images were obtained for all patients before the start of the intervention (T0) and after the active phase (9.4 ± 1.33 months) in the intervention group and at the beginning (T0) and after the observation period (T1) in the control group (8.12 ± 2.72 months). Measurements for the retromolar space were performed on the axial views, while those for molar angulation were performed on sagittal views as well as CBCT panoramic reformatted images.</p><p><strong>Results: </strong>Both twin block and control groups showed non-significant changes in the angular measurements (sagittal L8/MP° and panoramic L8/MP°) denoting lack of change in the angulation of the third molars in relation to the mandibular plane after treatment. On the other hand, retromolar spaces showed a statistically significant increase (P ≤ .05) in both groups. The change was much significant for the twin block group, measuring 1.95 mm and 1.56 mm on the right and left sides, respectively, as compared to the control group which revealed less than 1 mm increase in the retromolar space on both the right and left sides.</p><p><strong>Conclusions: </strong>In spite of their positive impact on the retromolar space, twin block bite jumping appliances have a non-significant influence on the angulation of the developing mandibular third molars.</p>","PeriodicalId":37013,"journal":{"name":"Turkish Journal of Orthodontics","volume":"35 3","pages":"166-172"},"PeriodicalIF":1.1,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9623186/pdf/tjo-35-3-166.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33494918","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}