Maxillary sinus morphometric changes after using three types of RME (conventional, hybrid and MSE)CBCT study 

Aim: of the study To evaluate morphometric changes in maxillary air sinus (MS) of three different Rapid maxillary expander (RME) {conventional, hybrid and maxillary skeletal expander (MSE)} using cone beam computed tomography (CBCT) Material: and Methods A total sample of sixty CBCT of patients presented with constricted maxilla with an age ranged from 11–18 was distributed in to three groups. Group 1 conventional hyrax, group 2 hybrid hyrax and group 3 maxillary skeletal expander (MSE). The mean age was 14.20Y, 15.13Y, 15.40Y in group 1,2 and 3 respectively CBCT records were taken before and after six month of maxillary expansion; the maxillary sinus was segmented and quantified using Romexis software (version 5.3.4.39USA). Results: Comparison between pre and post values and between left and right was performed by paired t test. the post treatment value was significantly higher than the pre value in the right side, left side and in both sides together. The significance level was set at P ≤ 0.05. One-way analysis of variance (ANOVA) test, followed by Bonferroni post hoc test. Conclusions: RME may have a good effect on maxillary sinus by increasing it is volume (MSV).