Comparison of the treatment effects of different rapid maxillary expansion devices on the maxilla and the mandible. Part 1: Evaluation of dentoalveolar changes

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Abstract

Introduction:

The aim of this study was to compare the dentoalveolar treatment effects of 3 rapid maxillary expansion (RME) appliances, supported by different tissues, on the maxilla and the mandible.

Methods:

Patients were assessed for eligibility, and those who met the requirements and agreed to participate were enrolled in the study. Participants were randomly allocated into 3 groups, depending on the type of expansion. The tooth-borne group (n = 16; ages, 12.63 ± 1.36 years) had RME with a tooth-borne appliance; the bone-borne group (n = 16; ages, 12.92 ± 1.07 years) had RME with a bone-borne appliance; and the hybrid group (n = 15; ages, 13.41 ± 0.88 years) had RME with hybrid appliances. Dentoalveolar effects were evaluated by digitally superimposed 3-dimensional scans of maxillary dental casts on a coordinate system and linear interdental width measurements of mandibular dental casts in the pretreatment, posttreatment, and postretention periods. For intragroup and intergroup comparisons, 1-way analysis of variance for repeated measures and multivariate analysis of variance were performed, respectively.

Results:

Similar dentoalveolar treatment effects were achieved in all groups with the exception of a small amount of expansion on the right side in the bone-borne group.

Conclusions:

All 3 expanders led to the expansion of maxillary dentoalveolar structures with mild relapse. However, the amount of expansion of the bone-borne expander on the right side was statistically lower. Spontaneous interdental expansion was observed in the mandibular dentitions in all groups.

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