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Angle Orthod. 2015 Jul;85(4):570-6. doi: 10.2319/041114-269.1. Epub 2014 Oct 14.

Dental arch response to Haas-type rapid maxillary expansion anchored to deciduous vs permanent molars: A multicentric randomized controlled trial.

Author information

1
a  Research Fellow, Department of Orthodontics, University of Genoa, Italy.
2
b  Private practice, Siena, Italy.
3
c  Research Fellow, Tuscan School of Dental Medicine, University of Siena, Italy.
4
d  Research Fellow, Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milano, Italy.
5
e  Professor, Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milano, Italy.
6
f  Professor, Tuscan School of Dental Medicine, University of Siena, Italy.
7
g  Professor, Department of Orthodontics, University of Genoa, Italy.
8
h  Professor, Department of Orthodontics, University of Insubria, Varese, Italy.

Abstract

OBJECTIVE:

To assess maxilla and mandibular arch widths' response to Haas-type rapid maxillary expansion (RME) anchored to deciduous vs permanent molars on children with unilateral posterior crossbite.

MATERIALS AND METHODS:

Seventy patients with unilateral posterior crossbite recruited at the Universities of Genova, Siena, and Insubria (Varese) were randomly located into GrE (RME on second deciduous molars) or Gr6 (RME on first permanent molars) and compared.

RESULTS:

Upper intermolar distance and permanent molar angulation increased significantly in Gr6 vs GrE at T1. Upper intercanine distance increased significantly in GrE vs Gr6 at T1 and T2. GrE showed significant increases for upper intermolar and upper intercanine widths. Gr6 showed statistically significant increases for upper intermolar widths, for upper and lower intercanine widths, and for increases of angulation of upper and lower permanent molars.

CONCLUSIONS:

GrE showed reduced molar angulation increases at T1 and reduced molar angulation decreases at T2 when compared with Gr6. At T2, the net increase of the upper intercanine distance in GrE was still significant compared with Gr6, indicating a more stable expansion in the anterior area.

KEYWORDS:

Deciduous vs permanent molars; Multicentric randomized trial; Rapid maxillary expansion; Three-dimensional

PMID:
25314034
DOI:
10.2319/041114-269.1
[Indexed for MEDLINE]

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