Mandibular Stability and Dentofacial Deformity

Study Overview
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Brief Summary
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The present study intends to clarify whether there is positional mandibular stability in patients to be submitted to orthognathic surgery. In case of any instability exists, it is needed to understand if this could be related to a particular type of dentofacial deformity or could have any short-term or long-term influence on outcomes of the orthognathic surgery.

Detailed Description
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Treatment of skeletal discrepancy nowadays is mainly performed by combination of clinical and surgical procedures in which orthodontics intends to align the teeth according to their respective alveolar bone and the surgical procedure - orthognathic surgery - realign the jaws in an adequate position among themselves and related to the rest of the craniofacial skeleton. Orthognathic surgery has developed throughout the years technically as well as regarding fixation devices for the operated segments, providing prediction of results with a low complication incidence. A debate point is related to the possible instability of the mandibular position as a reference for surgical planning due to its articulation with the temporal fossa, the temporomandibular joint. However, studies have shown that not always the mandible position obtained for the articulator reflects the position observed in subjects after induction of general anesthesia. Since there is no evidence that indicates that any alteration of the position of the mandible could influence the outcomes of a orthognathic surgery nor any relationship of a certain type of dentofacial deformity that would be beneficiated by an specific order of surgery or skeletal reference (maxilla or mandible), the present study intends to clarify some of these questions.

Official Title
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Evaluation of the Perioperative Mandibular Positional Stability in Subjects With Dentofacial Deformity

Conditions
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Maxillofacial Abnormalities

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Dentofacial Deformity candidate to orthognathic surgery; Systemically capable to be submitted to the orthognathic surgery. Exclusion Criteria: Patient's health condition is not stable enough to guarantee uneventful outcome; Required data unable to be achieved; Patient not agreeing to participate to the study.
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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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Dentofacial Deformity<br>Patients with dentofacial deformities candidate to orthognathic surgery | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Variability in mandibular position for different dental occlusion registrations | Centric occlusion, maximum intercuspation and occlusion under general anesthesia | Perioperative to orthognathic surgery | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Dentofacial Deformity, Orthognathic Surgery, Mandible, Orthognathic Surgical Procedures