Intercenter comparison of slow and rapid maxillary expansion in unilateral complete cleft lip and palate

Priscila Vaz Ayub 1, Daniela Gamba Garib 2, Hussain Ebrahim 3, José Polido 4 5, Wanderléia Blasca 6, Stephen Yen 7 8

Affiliations

07 April 2022

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doi: 10.1590/2177-6709.27.3.e2220233.oar

Abstract

in English, Portuguese

Objective: The aim of this study was to compare the occlusal changes of rapid maxillary expansion (RME) and slow maxillary expansion (SME) in patients with unilateral complete cleft lip and palate (UCLP), by means of digital dental models.

Methods: Group RME was composed by 22 patients (13 males and 9 females), with mean age of 9.9 years, treated with rapid maxillary expansion with Hyrax appliance in Center 1. Group SME was composed by 29 patients (14 females and 15 males), with mean age of 10.7 years, treated with slow maxillary expansion with quad-helix appliance in Center 2. Digital dental models of the maxillary dental arch were obtained immediately pre-expansion (T1) and 6-month post-expansion (T2). Transversal distances, arch perimeter, arch length, palatal depth, palatal volume and posterior tooth inclination were digitally measured. Interphase and intergroup comparisons were performed with paired t-test and independent t-test, respectively.

Results: Intercanine expansion was 4 to 5mm in both groups, and increase in the intercanine distance was similar for both groups. RME group showed a greater increase in arch distances at the region of permanent premolar and molars, compared to SME group. Arch perimeter increase was greater for RME group, compared to SME. No differences were found for arch length, palatal depth, palatal volume and posterior tooth buccal tipping.

Conclusion: RME and SME produced similar dentoalveolar outcomes, with greater amount of expansion on RME group.

Conflict of interest statement

The authors report no commercial, proprietary or financial interest in the products or companies described in this article.

Figures

Figure 1:. Starting forms (T1) and after bone graft (T2) of RME (A and B) and SME (C and D) groups.

Figure 1:. Starting forms (T1) and after bone graft (T2) of RME (A and B) and SME (C and D) groups.

Figure 2:. Transversal distance at cervical ( blue lines ) and occlusal level ( red lines ): Intercanine distance (3-3 / 3-3’), inter-first premolar or inter-deciduous first molar distance (4-4 / 4-4’), inter-second premolar or inter-deciduous second molar distance (5-5 / 5-5’), and intermolar distance (6-6 / 6-6’);

Figure 2:. Transversal distance at cervical ( blue lines ) and occlusal level ( red lines ): Intercanine distance (3-3 / 3-3’), inter-first premolar or inter-deciduous first molar distance (4-4 / 4-4’), inter-second premolar or inter-deciduous second molar distance (5-5 / 5-5’), and intermolar distance (6-6 / 6-6’);

Figure 3:. The measurement from the mesial gingival papilla of the permanent first molars to the contact point between the central incisors was considered Arch Length (AL).

Figure 3:. The measurement from the mesial gingival papilla of the permanent first molars to the contact point between the central incisors was considered Arch Length (AL).

Figure 4:. The measurement from the permanent first molars on the right side to the distal surface of the contralateral molar was considered Arch Perimeter (AP).

Figure 4:. The measurement from the permanent first molars on the right side to the distal surface of the contralateral molar was considered Arch Perimeter (AP).

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