Effectiveness of Rapid and Slow Maxillary Expansion in Treating Posterior Crossbite

Damascus University

Status: Completed

Conditions: Posterior Crossbite

Treatments: Procedure: Rapid Maxillary Expanding Device; Procedure: Slow Maxillary Expanding Device

Study type: Interventional

Funder types: Other

Identifiers

NCT03667508

UDDS-Ortho-19-2018

Details and patient eligibility

About

This study will evaluate the efficacy of rapid maxillary expansion (RME) and slow maxillary expansion (SME) in treating posterior crossbite using cone beam computed tomography.

The study sample will consist of 32 patients who suffer from a skeletal posterior crossbite. The sample will be allocated randomly into two groups: RME group and SME group.

The skeletal and dento-alveolar changes occurring after treatment will be assessed by using cone beam computed tomography(CBCT) radiographs.

Full description

Unilateral or bilateral posterior crossbite (PXB) is a common malocclusion. In recent decades, RME has gained preference as the treatment of choice for PXB. However, the side effects, such as reported pain, relapse of the expansion, tipping of the molars, bone loss, gingival recession, and root resorption, have lead some clinicians to prefer SME.

In this study the investigators will treat PXB using two techniques, RME and SME. Patients will be divided into two groups (a technique in each group) to evaluate the efficacy of each one using cone beam computed tomography.

RME group: A Hyrax appliance modified as McNamara will be applied. SME group: A removable appliance with central expander will be applied. In order to evaluate the changes occurring, two CBCT radiography will be taken for every individual: first, before treatment, second, after three months of retention for RME group and one month of retention for SME group

Enrollment: 34 patients

Sex: All

Ages: 12 to 16 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Bilateral skeletal maxillary deficiency (symmetrical) which will be clinically and radiographically diagnosed.
• Bilateral or unilateral functional posterior crossbite ( combined with mandibular shifting)
• Class I or II malocclusion.
• Normal or slight vertical growth pattern.

Exclusion criteria

• Poor oral hygiene.
• Previous orthodontic treatment.
• Patients with syndromes, clefts, or craniofacial abnormalities.
• Patients with low facial height.
• A contraindication for rapid or slow maxillary expansion procedures.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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34 participants in 2 patient groups

Rapid Maxillary Expansion

Experimental group

Description:

Patients will undergo Rapid Maxillary Expansion using a rapid maxillary expanding device, i.e. a Hyrax expander (modified by McNamra).

Treatment:

Procedure: Rapid Maxillary Expanding Device

Slow Maxillary Expansion

Active Comparator group

Description:

Patients will undergo Slow Maxillary Expansion using a slow maxillary expanding device, i.e. a removable appliance with a central screw.

Treatment:

Procedure: Slow Maxillary Expanding Device