IADR Abstract Archives
The ABO-OGS in Detail: The Determining Factors
Objectives: In order to improve orthodontic clinical outcomes, it is necessary to identify their critical aspects. The aim of this study was to assess the contribution of each component of the Objective Grading System of the American Board of Orthodontics (ABO-OGS) to the final score and their relationship to gender, complexity of the initial malocclusion, and treatment type applied.
Methods: A descriptive-ambispective study was done with 40 by convenience-selected patients (19 females) who finished orthodontic treatment at the Universidad de Antioquia, Medellin, Colombia and fulfilled the inclusion and exclusion criteria. Standardized panoramic X-rays and dental cast were taken after orthodontic appliances were removed. Clinical data was collected at the same time. Reliability tests were done. Descriptive variables were analyzed and the ABO-OGS variables’ distribution was tested with the Shapiro-Wilk test. Student’s t-test (p≤0.05) was applied to assess the OGS total score and its components according to gender and treatment type. ANOVA test (p≤0.05) was used to compare the ABO-OGS components according to malocclusion complexity. Pearson correlation was done for the evaluation of the different ABO-OGS components (p≤0.05).
Results: 50% of the patients scored acceptable ABO-OGS punctuation (Mean=31.7±8.3). The variables contributing most to the final ABO-OGS-score were: root angulation (17.90%), buccolingual inclination (17.40%), and marginal ridges discrepancies (16.56%). Buccolingual inclination was significantly better for the females (p=0.001). The extraction treatments showed a statistically significant difference in the overjet (p=0.042) when compared with the non-extraction treatments. Regarding the complexity of malocclusion at treatment start, a statistically significant association was found with the marginal ridge discrepancies (p=0.029) and the buccolingual inclinations (p=0.034).
Conclusions: Orthodontic treatment type and complexity are factors that could affect the outcomes. The critical aspects to focus on before the end of the orthodontic treatment are root angulation (tip), buccolingual inclination (torque) and marginal ridges discrepancies.
Methods: A descriptive-ambispective study was done with 40 by convenience-selected patients (19 females) who finished orthodontic treatment at the Universidad de Antioquia, Medellin, Colombia and fulfilled the inclusion and exclusion criteria. Standardized panoramic X-rays and dental cast were taken after orthodontic appliances were removed. Clinical data was collected at the same time. Reliability tests were done. Descriptive variables were analyzed and the ABO-OGS variables’ distribution was tested with the Shapiro-Wilk test. Student’s t-test (p≤0.05) was applied to assess the OGS total score and its components according to gender and treatment type. ANOVA test (p≤0.05) was used to compare the ABO-OGS components according to malocclusion complexity. Pearson correlation was done for the evaluation of the different ABO-OGS components (p≤0.05).
Results: 50% of the patients scored acceptable ABO-OGS punctuation (Mean=31.7±8.3). The variables contributing most to the final ABO-OGS-score were: root angulation (17.90%), buccolingual inclination (17.40%), and marginal ridges discrepancies (16.56%). Buccolingual inclination was significantly better for the females (p=0.001). The extraction treatments showed a statistically significant difference in the overjet (p=0.042) when compared with the non-extraction treatments. Regarding the complexity of malocclusion at treatment start, a statistically significant association was found with the marginal ridge discrepancies (p=0.029) and the buccolingual inclinations (p=0.034).
Conclusions: Orthodontic treatment type and complexity are factors that could affect the outcomes. The critical aspects to focus on before the end of the orthodontic treatment are root angulation (tip), buccolingual inclination (torque) and marginal ridges discrepancies.