Upper and lower arch changes after Mixed Palatal Expansion protocol

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ABSTRACT

Aim

The aim of this study was to evaluate upper and lower dental changes after Mixed Palatal Expansion (MPE) treatment
in growing patients with posterior single or bilateral crossbite and mild-to-moderate crowding, as compared to untreated growing
subjects by dental cast analysis.

Methods

A group of 24 patients (18 girls, 6 boys) was treated with Hyrax-type
device and compared with an untreated matched control group at T0 (8.6 yrs. 2) and at T1 (10 yrs. 2) using dental
casts. The dental cast analysis was performed on four dental bilateral landmarks, on upper and lower casts; also upper and lower arch
depths were measured. The groups were compared using independent sample t-test to estimate dental changes in upper and lower
arches.

Results

The MPE group showed significant upper and lower arch changes when compared with the control group. Upper
intermolar, interpremolar-2nd, interpremolar-1st (P<0.001) and intercanine widths (P<0.05) showed considerable changes in the treated group, while mandibular intermolar (P<0.001), interpremolar-1st (P<0.05) and intercanine widths (P<0.01) were slightly greater in the MPE group when compared with the control group.

Conclusion

The changes in transverse upper and lower arch
dimensions were significant, when compared with those seen in the control group.

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