The aim of this study was to compare changes in the mandibular cortical thickness using the PMI and MCI before and after orthodontic treatment and to determine the mandibular cortical thickness correlation between age, gender, skeletal class, and treatment.
We conducted a comparative, longitudinal, retrospective, single-center, homodemic study. Case records of patients in the period 2000 to 2010, the clinic FEBUAP Orthodontics; panoramic radiographs were evaluated at the beginning and end. The variables were age, gender, skeletal class, type of treatment, MCI and PMI.
Normality tests were performed to verify the distribution of the sample. Nonparametric test of Kolmogorov-Smirnov test showed a p-value < 0.05 and therefore our variables were distributed non-normally. The mean initial PMI was 0.32 with 0.33 final, while the MCI filed a first and final middle of C1. According to age group, the mean PMI was higher in group 5 (51-60 years). According to the treatment, an increase in the PMI after treatment in patients with extractions was observed. The MCI is represented by 63.2% with C1, C2 corresponds to 30.9%, and 5.8% corresponding to C3. There are significant changes in cortical thickness before and after orthodontic treatment according to the Wilcoxon test, with a p value of 0.009.
(Rev Esp Ortod. 2013;43(4):222-227)