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Assessment of vertical changes during maxillary expansion using quad helix or bonded rapid maxillary expander.

Authors :
Conroy-Piskai, Cara
Galang-Boquiren, Maria Therese S.
Obrez, Ales
Viana, Maria Grace Costa
Oppermann, Nelson
Sanchez, Flavio
Edgren, Bradford
Kusnoto, Budi
Source :
Angle Orthodontist; Nov2016, Vol. 86 Issue 6, p925-933, 9p
Publication Year :
2016

Abstract

Objective: To determine if there is a significantly different effect on vertical changes during phase I palatal expansion treatment using a quad helix and a bonded rapid maxillary expander in growing skeletal Class I and Class II patients. Materials and Methods: This retrospective study looked at 2 treatment groups, a quad helix group and a bonded rapid maxillary expander group, before treatment (T1) and at the completion of phase I treatment (T2). Each treatment group was compared to an untreated predicted growth model. Lateral cephalograms at T1 and T2 were traced and analyzed for changes in vertical dimension. Results: No differences were found between the treatment groups at T1, but significant differences at T2 were found for convexity, lower facial height, total facial height, facial axis, and Frankfort Mandibular Plane Angle (FMA) variables. A comparison of treatment groups at T2 to their respective untreated predicted growth models found a significant difference for the lower facial height variable in the quad helix group and for the upper first molar to palatal plane (U6-PP) variable in the bonded expander group. Conclusion: Overall, both the quad helix expander and the bonded rapid maxillary expander showed minimal vertical changes during palatal expansion treatment. The differences at T2 suggested that the quad helix expander had more control over skeletal vertical measurements. When comparing treatment results to untreated predicted growth values, the quad helix expander appeared to better maintain lower facial height and the bonded rapid maxillary expander appeared to better maintain the maxillary first molar vertical height. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00033219
Volume :
86
Issue :
6
Database :
Supplemental Index
Journal :
Angle Orthodontist
Publication Type :
Academic Journal
Accession number :
119138269
Full Text :
https://doi.org/10.2319/112315-799