American Journal of Orthodontics and Dentofacial Orthopedics最新文献

{"title":"Long-term survival of 57 premolars consecutively transplanted to premolar sites.","authors":"Teitur Jonsson, Hafdis B Jonsdottir, Thor Aspelund, Asgeir Sigurdsson, Thorarinn J Sigurdsson","doi":"10.1016/j.ajodo.2024.07.003","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.07.003","url":null,"abstract":"<p><strong>Introduction: </strong>The objective of this study was to report the long-term outcome of autotransplantation of premolars to other premolar recipient sites.</p><p><strong>Methods: </strong>The sample was limited to adolescents seeking orthodontic treatment, and all had 1 or 2 premolars transplanted to a recipient site in which a premolar was congenitally missing. The transplantations were performed between 1980 and 2008, comprising 29 premolars in 22 males and 28 premolars in 22 females. Systematic clinical and radiographic follow-up varied from 1 year to 36.8 years, with a mean observation time of 18.9 years and a median of 19.2 years. Of the 57 transplanted teeth, 52 were subjected to orthodontic forces.</p><p><strong>Results: </strong>A total of 9 of 57 teeth (15.8%) were lost during the observation period, and 8 of 9 lost teeth had been functional for at least 9 years posttransplantation. Of the 48 surviving transplants, 6 did not meet the criteria for success, giving an overall success rate of 73.7%. Complications were diagnosed within 5 years from the transplantation in 4 of 57 teeth (7.0%) and later in 11 of 57 (19.3%). The Kaplan-Meier survival curve shows that the complication-free proportion of transplants decreased at a constant rate over the observation time. The average survival time, taking censoring into account during follow-up of 36.8 years, was estimated as 28.5 years. The complications in the 15 teeth were classified into 4 categories: periapical lesions (6 teeth), inflammatory resorption (5 teeth), abrupt fracture (2 teeth), and ankylosis (2 teeth).</p><p><strong>Conclusions: </strong>Overall, premolar transplants in all stages of root formation have high success and survival rates. Transplants with complications may survive temporarily and preserve critical arch space and alveolar bone. Transplants with normal healing may have latent weaknesses that can eventually affect long-term survival.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141876640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orthodontic pain with fixed appliances and clear aligners: A 6-month comparison.","authors":"Victor Chan, Bhavna Shroff, Neal D Kravitz, Caroline Carrico, Daniel Hawkins, Phuong Tran, Steven Lindauer","doi":"10.1016/j.ajodo.2024.07.002","DOIUrl":"10.1016/j.ajodo.2024.07.002","url":null,"abstract":"<p><strong>Introduction: </strong>This prospective study compared pain perception, intensity, and analgesic use among patients treated with fixed appliances (FAs) and clear aligners (CAs) over 6 months.</p><p><strong>Methods: </strong>Digital surveys were collected from 87 adult patients treated with CA or FA from 2 orthodontic offices. The 7-item survey was sent at 3-time points (preappointment, 2-day postappointment, and 7-day postappointment) for each appointment. Wilcoxon, t test, and Fisher exact chi-square tests were performed with significance set at 0.05.</p><p><strong>Results: </strong>The FA group had a higher rate and intensity of pain 2 days after the second, third, and fifth appointments (P <0.030). At 7 days postappointment, the FA group had a higher rate and intensity of pain for the first and fifth appointments. Dull pain was reported the most in both groups, with a proportion of FA patients reporting throbbing (31%) or sharp (20%) pain (P = 0.035) at 2 days postappointment. The CA group reported the most pain at rest, whereas the FA group reported chewing as the most painful (P = 0.002). The FA group had a higher rate of analgesic consumption after the first appointment (P = 0.037).</p><p><strong>Conclusions: </strong>Both the FA and CA groups experienced similar rates and intensities of pain 2 days after the delivery of appliances at the first appointment. Although CA pain intensity remained minimal, FA pain peaked 2 days postappointment whenever a new orthodontic stimulus was introduced and remained elevated 7 days postappointment when that stimulus was a new archwire material.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141794048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of predicted and achieved root angulation changes in teeth adjacent to maxillary premolar extraction sites in patients treated with the Invisalign appliance.","authors":"Abirami Thilagalavanian, Tony Weir, Maurice J Meade","doi":"10.1016/j.ajodo.2024.06.014","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.06.014","url":null,"abstract":"<p><strong>Introduction: </strong>This study aimed to investigate the expression of root angulation in canine, premolar, and first molar teeth adjacent to first and second premolar extraction sites in the maxilla after treatment with an initial series of Invisalign aligners (Align Technology, Santa Clara, Calif).</p><p><strong>Methods: </strong>Adult patients (aged ≥18 years) with at least 1 first and/or second premolar extraction in the maxilla and satisfying strict selection criteria were evaluated. Digital models representing pretreatment, predicted, and posttreatment were obtained from Align Technology's digital interface, ClinCheck. The Geomagic Control X (version 2017.0.3; 3D systems, Rock Hill, NC) software facility was used to determine and compare the root angulation of adjacent canine, premolar, and first molar teeth at different time points.</p><p><strong>Results: </strong>The predicted angulation of teeth was significantly different (P <0.02) than that achieved in most patients. When adjacent teeth roots were planned to tip away from the extraction site, there was an overexpression of the movement. When teeth roots were planned to tip into the extraction site, underexpression occurred, and movement was in the opposite direction in some instances. There was no difference in root angulation outcomes according to the prescribed number of aligners, 1- or 2-week wear protocols, and sex (P >0.05). Attachments were influential in controlling angulation in first-premolar extractions (P = 0.05), but optimized attachments were not any more effective than conventional attachments (P >0.05).</p><p><strong>Conclusions: </strong>The achieved root angulation in teeth adjacent to premolar extraction sites in the maxilla after treatment with an initial series of Invisalign aligners differed significantly from that predicted. Attachments play a minor role in the predictability of root angulation outcomes.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141789672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is Hooke's law applicable to an orthodontic cantilever?","authors":"Hyung-Kyu Noh, Chang-Seok Park, Ho-Jin Kim, Hyo-Sang Park","doi":"10.1016/j.ajodo.2024.06.018","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.06.018","url":null,"abstract":"<p><strong>Introduction: </strong>This study aimed to analyze the load-deflection characteristics of an orthodontic cantilever by using the large deflection elastic model.</p><p><strong>Methods: </strong>We experimentally measured the vertical deflections of a cantilever with round or rectangular cross-sections, with lengths of 20 mm and 30 mm, and made of either stainless steel or titanium molybdenum alloy. The measurements were obtained under clinically relevant loading ranges (20-60 g of force for round and 20-140 g of force for rectangular wires) and compared with theoretical predictions derived from small and large deflection elastic models. Load-deflection and tangent stiffness curves were subsequently plotted.</p><p><strong>Results: </strong>The impact of a permanent deformation was clinically insignificant. The stiffness of the cantilever increased with the load or deflection rather than remaining constant. Within the clinical loading range, we identified stiffness reversal loading values at which the stiffness of titanium molybdenum alloy surpassed that of stainless steel. The textbook guidelines on cantilevers can apply only when the vertical deflection remains within 16% of its length.</p><p><strong>Conclusions: </strong>Within the typical clinical loading range, the load-deflection relationship of a cantilever deviates from Hooke's law because of the prominent deflection trait. The conventional model remains effective when the vertical deflection is within 16% of the cantilever length. Otherwise, it is advisable to determine the load and stiffness on the basis of actual measurements rather than relying on theoretical predictions.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141753283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short- and long-term effects of conventional and miniscrew-assisted rapid palatal expansion on hard tissues using voxel-based superimposition of serial cone-beam computed tomography scans.","authors":"Isaac Empson, Marinho Del Santo, Chia-Ling Kuo, Manuel Lagravere Vich, Dawei Liu, Sumit Yadav, Shivam Mehta","doi":"10.1016/j.ajodo.2024.06.017","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.06.017","url":null,"abstract":"<p><strong>Introduction: </strong>The objective of this study was to evaluate the short-term and long-term hard-tissue changes with miniscrew-assisted rapid palatal expansion (MARPE) and rapid palatal expansion (RPE) compared with a matched control group with voxel-based superimposition using 3-dimensional cone-beam computed tomography (CBCT) scans.</p><p><strong>Methods: </strong>A total of 180 CBCT scans were analyzed for 60 patients with a mean age of 13.9 years at 3 time points: pretreatment (T1), postexpansion (T2), and posttreatment (T3). Patients were divided into 3 groups: MARPE, RPE, and controls. Voxel-based superimposition was performed for CBCTs from T1 to T2 and T1 to T3 using the anterior cranial base as a reference. The hard-tissue surfaces were extracted after the superimposition procedure. Nine landmarks were analyzed: nasion, A-point, pogonion, left and right alar bases, zygoma, and gonion. Within-group changes were analyzed using linear mixed-effects models, including a random intercept per subject and the mixed effect of time (T1, T2, or T3) with test P values adjusted for multiple testing using Tukey's method. Between-group changes were analyzed using linear mixed-effects models, including a random intercept per subject and the mixed effects of time, group, and group × time interaction with P values adjusted for multiple testing using the Benjamin-Hochberg false discovery rate method.</p><p><strong>Results: </strong>In the short term, both MARPE and RPE led to a significant downward movement of the right gonion and lateral movement of the right alar base compared with controls at T2 (P <0.05). In addition, MARPE led to a significant downward movement of pogonion and left gonion. RPE led to a significant downward movement of the A-point and lateral movement of the left alar base compared with controls at T2 (P <0.05). However, in the long-term, no changes were observed between the groups at T3.</p><p><strong>Conclusions: </strong>There were significant differences in pogonion, alar base, and gonion between MARPE, RPE, and control groups in the short term. However, all the hard-tissue changes were transient, as there were no differences between the 3 groups in the long term.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141753284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adult orthodontics, motivations for treatment, choice, and impact of appliances: A qualitative study","authors":"Ama Johal,&nbsp;Shahad Hatam Damanhuri,&nbsp;Fiorella Colonio-Salazar","doi":"10.1016/j.ajodo.2024.02.009","DOIUrl":"10.1016/j.ajodo.2024.02.009","url":null,"abstract":"<div><h3>Introduction</h3><p>Understanding the rationale for adult patients undertaking orthodontic treatment and the impact of appliances on their quality of life has become increasingly important to research efforts and clinical care. This study aimed to understand why adult patients undergo orthodontic treatment and their overall experience with the choice of appliance.</p></div><div><h3>Methods</h3><p>A cross-sectional qualitative study using semistructured interviews with adult patients from 4 private specialist orthodontic practices in the London region involving a purposive homogeneous sampling technique to obtain variation regarding gender, treatment modalities (fixed ceramic [FC], removable aligner [RA], and fixed lingual [FL] appliances), and stages of treatment (early, late, and posttreatment stage) was undertaken. A piloted topic guide was used to standardize data collection. Interviews were audio recorded, and field notes were taken. Data were transcribed verbatim and analyzed using framework methodology until data saturation was reached.</p></div><div><h3>Results</h3><p>A total of 22 participants (FC, 8; RA, 8; and FL, 6), with a mean age of 38.9 ± 11.7 years, with the majority being female (n = 13; 59.1%), were interviewed. Psychosocial and dental health-related factors were reported as the main reasons to seek orthodontic treatment. Social factors and appliance features influence an adult’s decision-making in selecting a specific orthodontic appliance. Wearing FC, RA, and FL was seen to have both positive and negative impacts on an adult’s quality of life. Functional and psychological factors were the strong influencers on patients’ treatment experience.</p></div><div><h3>Conclusions</h3><p>The study highlighted the influence of psychosocial factors and dental health concerns in the decision-making processes of adults seeking orthodontic treatment. FC, RA, and FL appear to affect an adult’s quality of life, with functional and psychosocial factors being commonly reported.</p></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S088954062400088X/pdfft?md5=9ed398f10b39e028c0420908219e41e5&pid=1-s2.0-S088954062400088X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140194974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Directory: AAO Officers and Organizations","authors":"","doi":"10.1016/S0889-5406(24)00218-X","DOIUrl":"https://doi.org/10.1016/S0889-5406(24)00218-X","url":null,"abstract":"","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141486194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biomechanical effect of dual-dimensional archwire on controlled movement of anterior teeth compared with rectangular archwire: A finite element study","authors":"Daiki Kuga,&nbsp;Ryo Hamanaka,&nbsp;Hiroya Komaki,&nbsp;Jun-ya Tominaga,&nbsp;Runa Yamaguchi,&nbsp;Toshiro Emori,&nbsp;Yui Horiguchi,&nbsp;Noriaki Yoshida","doi":"10.1016/j.ajodo.2024.02.008","DOIUrl":"10.1016/j.ajodo.2024.02.008","url":null,"abstract":"<div><h3>Introduction</h3><p>This study aimed to determine and compare the effectiveness of the use of the dual-dimensional archwire and conventional rectangular archwire on tooth movement patterns when combined with various lengths of power arms.</p></div><div><h3>Methods</h3><p>Displacements of the maxillary central incisor and the deformation of the wire section were calculated when applying retraction forces from different lengths of power arms using the finite element method.</p></div><div><h3>Results</h3><p>Torque control of the incisor could be carried out more effectively when using the dual-dimensional archwire combined with long power arms than with the rectangular archwire. The use of the dual-dimensional archwire produced bodily movement of the central incisor at height levels of the power arm between 8 and 10 mm and lingual root tipping at the level of 10 mm.</p></div><div><h3>Conclusions</h3><p>The use of the dual-dimensional archwire provided better-controlled movement of the incisor, including bodily movement or root movement, than the rectangular archwire.</p></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140194975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The orthodontic extraction of second premolars: The influence on airway volume","authors":"Miodrag Mladenovic,&nbsp;Simon Freezer,&nbsp;Craig Dreyer,&nbsp;Maurice J. Meade","doi":"10.1016/j.ajodo.2024.02.013","DOIUrl":"10.1016/j.ajodo.2024.02.013","url":null,"abstract":"<div><h3>Introduction</h3><p>The extraction of second premolars and associated changes in the volume of the airway have not been previously explored. This retrospective study aimed to compare the volumetric changes of the airway preorthodontic and postorthodontic treatment in relevant extraction and control samples and to identify variables that may influence the outcome.</p></div><div><h3>Methods</h3><p>Cone-beam computed radiography scans of 54 patients with second premolar extraction and 59 nonextraction patients treated in a private orthodontic practice were matched for crowding. The average age for both samples was 15 years. The images were individually landmarked and measured by applying volumetric, linear, and angular parameters. The results were analyzed using repeated measures, such as variance analysis, correlation testing, and regression statistical analyses.</p></div><div><h3>Results</h3><p>There was a statistically significant increase in the airway volume for both groups (<em>P</em> &lt;0.05). The difference in increase between the groups was not statistically significant. Seven variables demonstrated a collectively significant effect on changes to airway volume (<em>F</em>[7,112] = 38.48; <em>P</em> &lt;0.001; <em>r</em>² = 0.701), with 70% of the variation predicted by the variables. Multiple regression analyses indicated that changes to the area of minimum constriction (B = 32.45; <em>t</em> = 11.95; <em>P</em> &lt;0.001) and changes to airway length (B = 94.75; <em>t</em> = 7.79; <em>P</em> &lt;0.001) had a statistically significant effect on airway volume.</p></div><div><h3>Conclusions</h3><p>The volume of the airway increased in both the extraction and nonextraction samples. The biggest contributors to the increase were an increase in airway length and an increase in the area of minimum constriction, which likely occurred as a result of natural growth.</p></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0889540624001124/pdfft?md5=0a4473e8e4a238902d98f179b54cfb0e&pid=1-s2.0-S0889540624001124-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140873333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artificial intelligence models in generating responses to general orthodontic questions: Comment","authors":"Hinpetch Daungsupawong,&nbsp;Viroj Wiwanitkit","doi":"10.1016/j.ajodo.2024.03.009","DOIUrl":"10.1016/j.ajodo.2024.03.009","url":null,"abstract":"","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141472289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}