scholarly journals Analysis of pretreatment factors associated with stability in early class III treatment

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Yasuko Inoue ◽  
Toru Deguchi ◽  
James K. Hartsfield ◽  
Wakako Tome ◽  
Noriyuki Kitai
Keyword(s):  
Horizontal Distance ◽  
Plane Angle ◽  
Class Iii ◽  
Mandibular Incisor ◽  
Factors Associated ◽  
Mandibular Molars ◽  
Centric Relation ◽  
The Stability ◽  
Functional Shift ◽  
Class Iii Treatment

Abstract Background The purpose of this study was to identify pretreatment factors associated with the stability of early class III treatment, since most orthodontists start the treatment with their uncertain hypotheses and/or predictions. Subjects consisted of 75 patients with a class III skeletal relationship (ANB < 2° and overjet < 0 mm) who had been consecutively treated with rapid maxillary expansion and facemask and followed until their second phase treatment. The patients were divided into two groups according to whether they showed relapse in follow-up. The stable group maintained their positive overjet (n = 55), and the unstable group experienced relapse with a zero or negative overjet (n = 20). Two general, three dental, and 13 cephalometric pretreatment factors were investigated to determine which factors were associated with stability. Results Sex, pretreatment age, and anteroposterior functional shift, which were hypothesized as associated factors, were not related to the stability of early class III treatment. Significant differences were detected between the two groups in the horizontal distance between the maxillary and mandibular molars in centric relation. Cephalometric variables, such as the mandibular length (Ar-Me), Wits appraisal, SN to ramus plane angle (SN-Rm), gonial angle, incisor mandibular plane angle (IMPA), and Frankfort plane to mandibular incisor angle (FMIA) showed significant differences between the groups. The horizontal distance was the most influential factor by logistic regression analysis. Conclusions Hypothesis (related to sex, age, functional shift) were rejected. Several cephalometric factors related to the mandible were associated with stability. The horizontal distance between the maxillary and mandibular molars in centric relation was the best predictor of early class III treatment relapse.

scholarly journals Class III malocclusion camouflage treatment in adults: A Systematic Review

2019 ◽  
pp. 1-12
Author(s):  
Silvio Bellini-Pereira ◽  
Arnaldo Pinzan ◽  
Aron Aliaga-Del Castillo ◽  
Guilherme Janson ◽  
Karine Laskos Sakoda ◽  
...  
Keyword(s):  
Data Extraction ◽  
Risk Of Bias ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Clockwise Rotation ◽  
Mandibular Incisor ◽  
Mandibular Molars ◽  
Language Studies ◽  
Maxillary Incisors ◽  
Mandibular Incisors

Objective: To evaluate the effects of camouflage treatment of Class III malocclusion in adults. Methods: An electronic search was performed in MEDLINE/PubMed, Embase, Scopus, Web of Science, Google Scholar, Lilacs, and Cochrane databases, without limitations regarding publication year or language. Studies evaluating nongrowing individuals with Class III malocclusion undergoing orthodontic camouflage treatment with any orthodontic technique, including extraction and non-extraction approaches, were considered. Study selection, data extraction, and risk of bias assessment according to a modified Downs and Black checklist were performed by two independent reviewers. A third evaluator was included if disagreements emerged. Results: Nine studies were included in the review. Eight presented high risk of bias. Different methods for Class III malocclusion correction were described and included maxillary and mandibular premolar extractions, mandibular incisor extraction, Class III elastics and distalization of the mandibular dentition. Extractions in the mandibular arch resulted in lingual tipping and retrusion of the mandibular incisors, and labial tipping and protrusion of the maxillary incisors. The use of Class III intermaxillary elastics promoted proclination of the maxillary incisors, extrusion of the maxillary molars, distal tipping of the mandibular molars, extrusion of the mandibular incisors, and clockwise rotation of the mandible. Distalization of the mandibular dentition resulted in distal tipping of the mandibular molars, retroclination and retraction of the mandibular incisors, and counter clockwise rotation of the mandible. Conclusions: Treatment changes are influenced by the method used to correct the Class III malocclusion and are primarily dentoalveolar

scholarly journals Sexual dimorphism in the long-term stability (10 years) of skeletal Class III treatment

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Natalia Tejedor ◽  
Conchita Martín ◽  
José Antonio Alarcón ◽  
María Dolores Oteo-Calatayud ◽  
Juan Carlos Palma-Fernández
Keyword(s):  
Sexual Dimorphism ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Skeletal Class ◽  
Term Stability ◽  
Long Term Stability ◽  
Fixed Appliances ◽  
Males And Females ◽  
Class Iii Treatment

Abstract Background Class III malocclusion is associated with high sexual dimorphism, especially in individuals older than 13 years of age, with significant differences in growth between males and females during the pubertal and postpubertal stages, and in adulthood. The aim of this research was to examine differences between males and females in long-term stability (10 years) of treatment for skeletal Class III malocclusion. Methods Thirty patients (15 males and 15 females) with skeletal Class III malocclusion, who had been treated with rapid maxillary expansion (RME) combined with face mask protraction followed by fixed appliances, were selected sequentially. Thirty patients (15 males and 15 females) with skeletal Class I and mesofacial patterns treated only with fixed appliances for dental problems served as the control group. Differences between groups and sexes were evaluated using lateral cephalograms taken at the start of treatment (T0), immediately after the end of treatment (T1), and after 10 years (T2). The long-term treatment success rate was calculated. Results Ten years after Class III treatment, overjet and overbite relapse occurred similarly in females (− 0.68 ± 0.7 mm; − 0.38 ± 0.75 mm, respectively) and males (− 1.09 ± 1.47 mm; − 0.64 ± 0.9 mm, respectively); the ANB angle and Wits appraisal became significantly more negative in males (− 1.37 ± 1.06°; − 2.7 ± 2.53 mm) than in females (− 0.18 ± 1.26°; − 0.46 ± 1.94 mm). The success rate was 73.3% in males and 80% in females. Conclusions Significant differences in the long-term stability of Class III treatment outcomes have been found between males and females, with a larger skeletal Class III relapse and lower long-term success rates in males.

scholarly journals Inlay-Retained Dental Bridges—A Finite Element Analysis

2021 ◽  
Vol 11 (9) ◽  
pp. 3770
Author(s):  
Monica Tatarciuc ◽  
George Alexandru Maftei ◽  
Anca Vitalariu ◽  
Ionut Luchian ◽  
Ioana Martu ◽  
...  
Keyword(s):  
Finite Element ◽  
Young Patients ◽  
Maximum Pressure ◽  
Class Iii ◽  
Element Analysis ◽  
Dental Prostheses ◽  
Abutment Teeth ◽  
Fixed Dental Prostheses ◽  
Implant Therapy ◽  
The Stability

Inlay-retained dental bridges can be a viable minimally invasive alternative when patients reject the idea of implant therapy or conventional retained full-coverage fixed dental prostheses, which require more tooth preparation. Inlay-retained dental bridges are indicated in patients with good oral hygiene, low susceptibility to caries, and a minimum coronal tooth height of 5 mm. The present study aims to evaluate, through the finite element method (FEM), the stability of these types of dental bridges and the stresses on the supporting teeth, under the action of masticatory forces. The analysis revealed the distribution of the load on the bridge elements and on the retainers, highlighting the areas of maximum pressure. The results of our study demonstrate that the stress determined by the loading force cannot cause damage to the prosthetic device or to abutment teeth. Thus, it can be considered an optimal economical solution for treating class III Kennedy edentation in young patients or as a provisional pre-implant rehabilitation option. However, special attention must be paid to its design, especially in the connection area between the bridge elements, because the connectors and the retainers represent the weakest parts.

Long-term effects of Class III treatment with rapid maxillary expansion and facemask therapy followed by fixed appliances

2003 ◽  
Vol 123 (3) ◽  
pp. 306-320 ◽  
Author(s):  
Patricia Vetlesen Westwood ◽  
James A. McNamara ◽  
Tiziano Baccetti ◽  
Lorenzo Franchi ◽  
David M. Sarver
Keyword(s):  
Rapid Maxillary Expansion ◽  
Class Iii ◽  
Long Term Effects ◽  
Maxillary Expansion ◽  
Fixed Appliances ◽  
Class Iii Treatment

scholarly journals Influence of magnification and superimposition of structures on cephalometric diagnosis

2015 ◽  
Vol 20 (2) ◽  
pp. 29-34 ◽  
Author(s):  
Leonardo Koerich de Paula ◽  
Priscilla de Almeida Solon-de-Mello ◽  
Claudia Trindade Mattos ◽  
Antônio Carlos de Oliveira Ruellas ◽  
Eduardo Franzotti Sant'Anna
Keyword(s):  
Horizontal Plane ◽  
Intraclass Correlation ◽  
Individual Variability ◽  
Occlusal Plane ◽  
Maxillary Incisor ◽  
Plane Angle ◽  
R Software ◽  
Mandibular Incisor ◽  
Full Face ◽  
Frankfort Horizontal Plane

OBJECTIVE: The purpose of this study was to assess the influence of magnification and superimposition of structures on CBCT-generated lateral cephalometric radiographs (LCR) using different segments of the cranium. METHODS: CBCT scans of 10 patients were selected. Four LCR were generated using Dolphin Imaging(r) software: full-face, right side, left side and center of the head. A total of 40 images were imported into Radiocef Studio 2(r), and the angles of the most common cephalometric analyses were traced by the same observer twice and within a 10-day interval. Statistical analyses included intraexaminer agreement and comparison between methods by means of intraclass correlation coefficient (ICC) and Bland-Altman agreement tests. RESULTS: Intraexaminer agreement of the angles assessed by ICC was excellent (> 0.90) for 83% of measurements, good (between 0.75 and 0.90) for 15%, and moderate (between 0.50 and 0.75) for 2% of measurements. The comparison between methods by ICC was excellent for 68% of measurements, good for 26%, and moderate for 6%. Variables presenting wider confidence intervals (> 6o) in the Bland-Altman tests, in intraexaminer assessment, were: mandibular incisor angle, maxillary incisor angle, and occlusal plane angle. And in comparison methods the variables with wider confidence interval were: mandibular incisor, maxillary incisor, GoGn, occlusal plane angle, Frankfort horizontal plane (FHP), and CoA. CONCLUSION: Superimposition of structures seemed to influence the results more than magnification, and neither one of them significantly influenced the measurements. Considerable individual variability may occur, especially for mandibular and maxillary incisors, FHP and occlusal plane.

scholarly journals Class III treatment with occlusal plane reconstruction – clinical case

2019 ◽  
Vol 51 (sup1) ◽  
pp. 127-128
Author(s):  
Kizi Gunel ◽  
Alves Valter ◽  
Barata Ana ◽  
Carvalho Marta ◽  
Delgado Ana
Keyword(s):  
Clinical Case ◽  
Occlusal Plane ◽  
Class Iii ◽  
Class Iii Treatment

scholarly journals Stability of bimaxillary surgery on Class III malocclusion treatment

2012 ◽  
Vol 17 (6) ◽  
pp. 41-51 ◽  
Author(s):  
Fernando Antonio Gonçalves ◽  
Vânia Célia Vieira de Siqueira
Keyword(s):  
Muscle Adaptation ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Mandibular Setback ◽  
Skeletal Malocclusion ◽  
Lateral Cephalograms ◽  
Maxillary Surgery ◽  
Bimaxillary Surgery ◽  
Student’S T ◽  
The Stability

OBJECTIVE: To evaluate the stability of bimaxillary surgery in patients with skeletal malocclusion, with the use of rigid internal fixation. METHODS: Lateral cephalograms from 20 patients, 11 males and 9 females, mean age of 26 years and 1 month, were evaluated before surgery, immediately post-operative and at least 6 months after surgery. Nineteen cephalometric measurements were evaluated, and the results were statistically analyzed by means of the Student's t test and the Kruskal-Wallis test. RESULTS: The Le Fort I maxillary advancement surgery showed almost no relapse. There was lack of stability of mandibular setback, with relapse of 37.33% on point B, due to counterclockwise rotation of the mandible between post-operative periods, occurred by better intercuspation after surgery and muscle adaptation. The results showed the same tendencies for both genders. CONCLUSION: It was concluded that on the bimaxillary surgery treatment of Class III malocclusion, the maxillary surgery was very stable, but the mandibular setback recurred. No statistical differences were found in surgical stability between genders.

scholarly journals Correction of severe facial asymmetry: A case with fractured condyle

2019 ◽  
Vol 9 ◽  
pp. 59-64
Author(s):  
Ramesh Agrawal ◽  
Dolly P. Patel ◽  
Bhagyashree B. Desai
Keyword(s):  
Facial Asymmetry ◽  
Post Treatment ◽  
Radiographic Examination ◽  
Rigid Fixation ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
History Of ◽  
Condylar Head ◽  
The Stability ◽  
The Right

The current paper depicts the challenges faced during the treatment of a complicated case of mandibular condylar head fracture, facial asymmetry, and centric relation-centric occlusion (CR-CO) discrepancy along with Class III malocclusion. A 20-year-old female reported with the chief complaint of difficulty in chewing and concern with her appearance due to deviated jaw and had a history of trauma over chin region. The clinical and radiographic examination revealed significant facial asymmetry with long face, right-sided deviation of the mandible, fractured condyle, CR-CO discrepancy, cross- bite with Class III malocclusion, and a missing mandibular single incisor along with non-vital 21 and 22. She was treated with 0.022 MBT appliance along with guiding plane for CR-CO correction followed by asymmetric bilateral sagittal split osteotomy and differential set back on the right and left sides and finally rigid fixation. A good facial profile and functional occlusion were achieved and non-vital 21 and 22 were esthetically rehabilitated with PFM crowns. The stability of surgical as well as orthodontic corrections was excellent and appreciable in the records obtained 2-year post-treatment. When faced with mutilated malocclusion, with multiple problems, sequential correction of functional malocclusion with dental decompensation followed by skeletal correction with surgical approach has yielded a appreciable facial correction with good stability showing 2-year post-treatment follow-up.

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