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Introduction: The main apprehension of new orthodontic patients, other than the outcome, is the time taken of treatment. A thorough knowledge of orthodontic treatment time as well as factors affecting the treatment time is useful for effective patient therapy and better clinical practice. Henceforth, the aim of our study was to compare the treatment durations of subjects with Class I, Class III and Class II division 1 (II/1) malocclusions, pre and post- secondary alveolar bone grafting (SABG) orthodontic treatments, and to recognize the factors affecting the treatment time of these malocclusions.
Materials and Methods: The study included 120 subjects and data were noted from their treatment records. ANOVA was done to know the difference in treatment durations of Class I, Class III and Class II/1 malocclusions, pre and post secondary alveolar bone grafting (SABG) orthodontic treatments, whereas multiple linear regression was applied to identify the factors affecting the treatment time. A level of significance (p≤0.05) was used for the statistical tests.
Results: A statistically significant difference was found between the treatment durations of class II nonextraction cases (p≤0.007) and other groups, class I extraction cases and other groups (p≤0.001), class III (p≤0.004), post SABG and other groups (p≤0.004). The factors significantly increasing the treatment time included missed appointments, breakages, and lower incisor proclination.
Conclusion: Orthodontic treatment of cleft and Class II/1 malocclusion lasts longer than that of Class I malocclusion or Class III. Prolonged treatment time is associated with missed appointments, band/bracket debonds and increased lower incisor inclination. The variance in treatment time can be explained most significantly by number of missed appointments and breakages