Sagittal dentoskeletal modifications associated with different activation protocols of rapid maxillary expansion

Authors:

ABSTRACT

Aim

The aim of this study is to compare the sagittal dentoskeletal changes associated with different activation protocols of
maxillary expander.

Methods

A total of 101 subjects with constricted maxillary arches (49 males and 52 females;
mean age 10.08 ± 1.57 years) were enrolled in the study. The study comprised also a control group of 20 subjects (11 females and 9
males, mean age 10.27 ± 1.24 years) who were not treated during the observation period. All the subjects underwent rapid maxillary
expansion with a stainless steel banded expander cemented to the maxillary first molars. The expansion screw was randomly activated
with two different rapid maxillary expansion protocols (one-quarter per day or two-quarters per day). A statistical comparison between
the sagittal cephalometric variations obtained in the two expansion groups was made, and compared with the untreated control group.
Data were then stratified for skeletal maturation of each subject.

Results

The Wilcoxon rank-sum test shows statistically significant
differences between the two RME activation protocols only for overjet. Statistically significant differences were reported in comparison
with the control group. CONCLUSIONS: This study suggests that the increase in overjet after RME could be associated with faster
activation protocols especially in subjects with lower skeletal maturation.

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