Analysis of the Dentoskeletal Effects of the Expander With Differential Opening

University of Sao Paulo

Status: Unknown

Conditions: Bilateral Posterior Crossbite; Maxillary Constriction; Mandibular Dental Arch Constriction; Unilateral Posterior Crossbite

Treatments: Device: Conventional rapid maxillary expansion; Device: Differential rapid maxillary expansion

Study type: Interventional

Funder types: Other

Identifiers

NCT02810353

Bauru Dental School, USP

Details and patient eligibility

About

This study evaluates the dentoskeletal effects of the expander with differential opening in orthodontic patients in the mixed dentition. Half of participants will undergo rapid maxillary expansion (RME) using the expander with differential opening, while the other half will undergo RME using the conventional Hyrax expander.

Full description

Recently, a rapid maxillary expander with differential opening was developed aiming to treat maxillary constrictions greater in the anterior region compared to the posterior region of the maxillary dental arch. The aim of this study is to evaluate the dentoskeletal effects of the expander with differential opening in orthodontic patients in the mixed dentition. Material and methods: Fifty patients with maxillary constriction in the mixed dentition will be prospectively and randomly allocated in one of two study groups. The experimental group will comprise 25 patients who will be submitted to rapid maxillary expansion with the expander with differential opening. The control group will be comprised by 25 individuals who will undergo rapid maxillary expander with the Hyrax expander. Digital dental models will be acquired immediately pre-expansion (T1) and six months post-expansion (T2). The Orthoanalyzer™ software will be used to measure maxillary and mandibular widths, arches perimeter, arches lengths, palatal depth, and inclinations of maxillary and mandibular canines and permanent first molars. The intergroup and interphase comparisons will be analyzed using t tests and paired t tests, respectively (p<0.05).

Enrollment: 50 estimated patients

Sex: All

Ages: 7 to 11 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Both sexes;
• Ages ranging from 7 to 11 years old;
• Mixed dentition;
• Maxillary constriction;
• No previous orthodontic treatment.

Exclusion criteria

• Cleft lip and palate and associated syndromes;
• Systemic and/or neurological diseases.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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50 participants in 2 patient groups

Expander with differential opening group

Experimental group

Description:

The experimental group will comprise 25 patients who will be submitted to rapid maxillary expansion using the expander with differential opening. The expander will be composed by two 11-mm screws, one anteriorly and the other posteriorly positioned on the palate (Great lakes Orthodontics Ltd, NY, EUA).

Treatment:

Device: Differential rapid maxillary expansion

Hyrax group

Active Comparator group

Description:

The control group will be comprised by 25 patients who will undergo rapid maxillary expansion using the conventional Hyrax expander. The expander will be composed by one 11-mm screw centrally positioned on the palate (Dentaurum, Ispringen, Germany).

Treatment:

Device: Conventional rapid maxillary expansion