Effectiveness of Rapid and Slow Maxillary Expansion in Treating Posterior Crossbite

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

34 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-03-19

Study Completion Date

2019-06-15

Brief Summary

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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.

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Detailed Description

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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

Conditions

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Posterior Crossbite

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

SINGLE

Outcome Assessors

Study Groups

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Rapid Maxillary Expansion

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

Group Type EXPERIMENTAL

Rapid Maxillary Expanding Device

Intervention Type PROCEDURE

The expansion screw will be turned two times in the first day, and then daily until the correction is achieved.

Slow Maxillary Expansion

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

Group Type ACTIVE_COMPARATOR

Slow Maxillary Expanding Device

Intervention Type PROCEDURE

The expansion screw will be activated every five days until correcting the crossbite.

Interventions

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Rapid Maxillary Expanding Device

The expansion screw will be turned two times in the first day, and then daily until the correction is achieved.

Intervention Type PROCEDURE

Slow Maxillary Expanding Device

The expansion screw will be activated every five days until correcting the crossbite.

Intervention Type PROCEDURE

Other Intervention Names

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Bonded Acrylic Hyrax Expander Removable Expansion Plate

Eligibility Criteria

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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.

Minimum Eligible Age

12 Years

Maximum Eligible Age

16 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No