The Gonial Angle as a Predictive Marker of Mandibular Fossa Depth

Study Overview
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Brief Summary
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The aim of the study is to evaluate the relationship between submandibular fossa depth and gonial angle measurements in cone beam computed tomography examinations in terms of dental implant applications. Cone-beam computed tomography images of 51 dry human mandibles were included in the study.

Detailed Description
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Gonial angle and fossa depths were determined and evaluated separately for left and right sides. Gonial angle was measured on Cone-beam computed tomography images as the angle between the tangent line drawn posterior to the border of the ramus of the mandible and the tangent line drawn to the lower border of the mandible. Determination of the submandibular fossa depth was made with a line was drawn to connect the most dislocated upper and lower points on the inner surface of the mandible in the coronal plane sections, and the length of the line drawn at a right angle from the deepest point of the fossa to this line. Measurements were made separately for left and right sides.

Official Title
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The Gonial Angle as a Predictive Marker of Mandibular Fossa Depth on Panoramic Radiographs: A Diagnostic Accuracy Study

Conditions
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Dental Implants, Submandibular Fossa Depth, Gonial Angle, Cone-beam Computed Tomography, Panoramic Radiography

Intervention / Treatment
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* Diagnostic Test: Gonial angle and submandibular fossa depth measurements from CBCT images


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Dry mandibles with sufficient bone integrity to make the necessary measurements Exclusion Criteria: Dry mandibles which were dentate in the posterior region
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 |
| --- | --- |
| Dry human mandibles, selected for evaluation<br>51 dry mandibles with posterior region endetulism and sufficient bone integrity to make the necessary measurements were evaluated. CBCT images of the 51 dry human mandibles included in the study were obtained using the Planmeca Promex-3D (Helsinki, Finland) device in our faculty Dentomaxillofacial Radiology department. Gonial angle was measured on CBCT images as the angle between the tangent line drawn posterior to the border of the ramus of the mandible and the tangent line drawn to the lower border of the mandible. While determining the depth of the submandibular fossa, a line was drawn to connect the most dislocated upper and lower points on the inner surface of the mandible in the coronal plane sections obtained with CBCT, and the length of the line drawn at a right angle from the deepest point of the fossa to this line was measured as the depth of the submandibular fossa. | Diagnostic Test: Gonial angle and submandibular fossa depth measurements from CBCT images<br>* CBCT images were obtained from dry human mandibles<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Gonial angle | Gonial angle and fossa depths were determined and evaluated separately for left and right sides. Gonial angle was measured on CBCT images as the angle between the tangent line drawn posterior to the border of the ramus of the mandible and the tangent line drawn to the lower border of the mandible. | 2 months | 
| Submandibular fossa depth | A line was drawn to connect the most dislocated upper and lower points on the inner surface of the mandible in the coronal plane sections obtained with CBCT, and the length of the line drawn at a right angle from the deepest point of the fossa to this line was measured as the depth of the submandibular fossa. These measurements were noted as 'millimeters' separately for left and right sides. | 2 months |