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Randomized Controlled Trial
. 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

Alessandro Ugolini  1 , Carmen Cerruto  2 , Luca Di Vece  3 , Luis Huanca Ghislanzoni  4 , Chiarella Sforza  5 , Tiziana Doldo  6 , Armando Silvestrini-Biavati  7 , Alberto Caprioglio  8
Affiliations
Randomized Controlled Trial

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

Alessandro Ugolini et al. Angle Orthod. 2015 Jul.

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.

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Figures

Figure 1. (a) Haas-type RME banded on upper second deciduous molars. (b) Haas-type RME banded on upper first permanent molars.
Figure 1.
(a) Haas-type RME banded on upper second deciduous molars. (b) Haas-type RME banded on upper first permanent molars.
Figure 2. (a) Maxillary 3D dental cast. (b) Mandibular 3D dental cast. Line 1  =  palatal maxillary and lingual mandibular intermolar width; line 2  =  maxillary and mandibular vestibular intermolar width; line 3  =  maxillary and mandibular intercanine width.
Figure 2.
(a) Maxillary 3D dental cast. (b) Mandibular 3D dental cast. Line 1  =  palatal maxillary and lingual mandibular intermolar width; line 2  =  maxillary and mandibular vestibular intermolar width; line 3  =  maxillary and mandibular intercanine width.
Figure 3. FACC of the upper right first permanent molar and upper right deciduous canine.
Figure 3.
FACC of the upper right first permanent molar and upper right deciduous canine.
Figure 4. (a) Triangular reference plane for crown angulation in maxillary 3D dental cast. (b) Triangular reference plane for crown angulation in mandibular 3D dental cast.
Figure 4.
(a) Triangular reference plane for crown angulation in maxillary 3D dental cast. (b) Triangular reference plane for crown angulation in mandibular 3D dental cast.
Figure 5. (a) Crown angulations of 1.6, 2.6, 5.3, and 6.3 in the maxillary 3D dental casts. (b) Crown angulations of 3.6, 4.6, 7.3. and 8.3 in the mandibular 3D dental casts.
Figure 5.
(a) Crown angulations of 1.6, 2.6, 5.3, and 6.3 in the maxillary 3D dental casts. (b) Crown angulations of 3.6, 4.6, 7.3. and 8.3 in the mandibular 3D dental casts.
Figure 6. Lower increase molar angulation between T0 and T2.
Figure 6.
Lower increase molar angulation between T0 and T2.
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