Correlation Between Dental Inclination and Bone Thickness in Patients With Class III Dentofacial Deformities

Study Overview
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Brief Summary
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The correlation between tooth inclination and bone thickness and the comparison between thickness measurements and buccolingual inclination before and after dental decompensation will be evaluated through tridimensional images in individuals with class III dentofacial deformities.

Detailed Description
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Class III dentofacial deformity is associated with important functional, psychological and aesthetic changes and thus individuals affected by this type of deformity are motivated in seeking treatment. The sample will consist of three-dimensional images of 40 individuals with Class III dentofacial deformities. From these images generated by CBCT scans, the buccolingual inclinations of all teeth and maxillo-mandibular alveolar bone thickness in three different heights will be measured (3, 6 and 8 mm) from the cementoenamel junction through the Dolphin 3D® program. The 3D scans of the sample will be evaluated in two stages: the initial stage and after dental decompensation at the end of pre-surgical orthodontic phase. Pearson correlation test will be used to verify the relationship between tooth inclination and bone thickness. The thickness measurements and buccolingual inclination will be compared between treatment times (initial and pre-surgical) using paired Student t-test.

Official Title
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Correlation Between Buccolingual Dental Inclination and Bone Thickness After Orthodontic Decompensation in Patients With Class III Dentofacial Deformities

Conditions
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Dentofacial Deformities

Intervention / Treatment
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* Procedure: orthodontic decompensation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Brazilian nationality; Class III malocclusion, for molars and canines; Concave facial profile; Indications for orthodontic-surgical treatment; Craniofacial growth finalized ; Absence of tooth extractions; No local and / or general contraindications for surgery; No previous orthodontic-surgical treatment; Good dental and periodontal conditions. Exclusion Criteria: Facial asymmetry; Absence of teeth (except the third molars); Periodontal disease and vertical or horizontal bone resorption; Extensive metal restorations; Previous orthodontic treatment; Root anomalies.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Orthodontic decompensation<br>Orthodontic decompensation in patients with class III dentofacial deformities | Procedure: orthodontic decompensation<br>* Evaluation of the correlation between bone thickness and tooth inclination previously and after orthodontic treatment of decompensation due to orthognathic surgery<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in tooth inclination and bone thickness after tooth decompensation |  | 12 months after the begginning of orthodontic treatment, prior to orthognathic surgery | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Angle class III, tomography, tooth inclination, bone thickness