Long-term stability of Class III treatment: Rapid palatal expansion and protraction facemask vs LeFort I maxillary advancement osteotomy

2007 ◽  
Vol 131 (1) ◽  
pp. 7.e9-7.e19 ◽  
Author(s):  
Valmy Pangrazio-Kulbersh ◽  
Jeffrey L. Berger ◽  
Francis N. Janisse ◽  
Burcu Bayirli
Keyword(s):  
Class Iii ◽  
Term Stability ◽  
Palatal Expansion ◽  
Long Term Stability ◽  
Rapid Palatal Expansion ◽  
Maxillary Advancement ◽  
Class Iii Treatment

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 Long-term stability of maxillary and mandibular arch dimensions when using rapid palatal expansion and edgewise mechanotherapy in growing patients

2019 ◽  
Vol 49 (2) ◽  
pp. 89
Author(s):  
Ki Beom Kim ◽  
Renee E. Doyle ◽  
Eustáquio A. Araújo ◽  
Rolf G. Behrents ◽  
Donald R. Oliver ◽  
...  
Keyword(s):  
Mandibular Arch ◽  
Term Stability ◽  
Palatal Expansion ◽  
Long Term Stability ◽  
Rapid Palatal Expansion

scholarly journals Development and validation of a prediction model for long-term unsuccess of early treatment of Class III malocclusion

2019 ◽  
Vol 42 (2) ◽  
pp. 200-205 ◽  
Author(s):  
Bernardo Quiroga Souki ◽  
Michele Nieri ◽  
Chiara Pavoni ◽  
Helena Maria Pavan Barros ◽  
Tarcisio Junqueira Pereira ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Prediction Model ◽  
Early Treatment ◽  
Class Iii ◽  
Term Stability ◽  
Long Term Stability ◽  
Unsuccessful Treatment ◽  
Lateral Cephalograms ◽  
Bivariate Logistic Regression

Summary Aim To develop and validate a prediction model to forecast long-term stability of early treatment with rapid maxillary expansion (RME) and facemask (FM) in a large sample of Class III growing patients. Methods The Brazilian Group (BG) consisted of 73 consecutively treated Caucasian Class III patients (41 females and 32 males). Mean age at T0 (before treatment) was 7.1 ± 1.6 years, while mean age at T1 (long-term follow-up) was 21.8 ± 3.2 years. The Italian Group (IG, validation cohort) comprised 28 consecutively treated Caucasian Class III patients (14 females and 14 males, mean age at T0 9.0 ± 1.3 years and mean age at T1 18.2 ± 1.4 years). Cephalometric analysis was performed on lateral cephalograms at T0. Gender and cephalometric variables, chronologic age, and dentition phase at T0 were used as predictors for long-term unsuccessful treatment at T1. All predictors for unsuccessful treatment in the BG were subjected to bivariate logistic regression. Only those statistically significant predictors in the bivariate logistic regression entered mixed stepwise logistic regression with P = 0.05 to enter and to leave. The validity of the prediction model derived from the BG was then tested on the IG. Results The prediction model consisted of only one cephalometric variable: the angle between the Condylar Axis and the Mandibular Plane (CondAx–MP) (odds ratio: 1.52, 95% confidence interval: 1.25–1.85, P < 0.0001). Unsuccessful treatment at T1 was predicted for values of CondAx–MP at T0 greater than the cut-off value of 147.8 degrees. BG patients predicted incorrectly were 3 out of 22 for the unsuccessful cases and 1 out of 51 for the successful cases. Therefore, accuracy was 0.95, sensitivity 0.86, specificity 0.98, and positive and negative predictive values were 0.95 and 0.94. When the predictive model was applied on IG, all five unsuccessful cases were predicted correctly, while only 1 out of 23 successful patients was predicted incorrectly. Conclusion CondAx-ML was identified as a reliable predictor for long-term stability of early Class III treatment with RME and FM.

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