The Gonial Angle as a Predictive Marker of Mandibular Fossa Depth

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

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.

Study Overview

• Status: Completed
• Conditions: Dental Implants; Cone-beam Computed Tomography; Submandibular Fossa Depth; Gonial Angle; Panoramic Radiography
• Intervention / Treatment: Diagnostic test: Gonial angle and submandibular fossa depth measurements from CBCT images

Detailed Description

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.

• Study Type: Observational
• Enrollment (Actual): 74

Contacts and Locations

Study Locations

• Turkey
  • Ankara, Turkey
    • Ankara University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: ADULT; OLDER_ADULT; CHILD
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

In the present diagnostic accuracy study, 75 dry human mandibles were used. 24 dry human mandibles with insufficient bone integrity to make the necessary measurements or which were dentate in the posterior region were not included in the study and the study was carried out with 51 dry mandibles.

Description

Inclusion Criteria:

• Dry mandibles with sufficient bone integrity to make the necessary measurements

Exclusion Criteria:

• Dry mandibles which were dentate in the posterior region

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort

Intervention / Treatment

Dry human mandibles, selected for evaluation; 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; CBCT images were obtained from dry human mandibles

What is the study measuring?

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

Collaborators and Investigators

• Sponsor: Ankara University

Study record dates

Study Major Dates

• Study Start (ACTUAL): July 1, 2019
• Primary Completion (ACTUAL): August 31, 2019
• Study Completion (ACTUAL): August 31, 2019

Study Registration Dates

• First Submitted: March 15, 2021
• First Submitted That Met QC Criteria: March 15, 2021
• First Posted (ACTUAL): March 16, 2021

Study Record Updates

• Last Update Posted (ACTUAL): March 16, 2021
• Last Update Submitted That Met QC Criteria: March 15, 2021
• Last Verified: March 1, 2021

More Information

Terms related to this study

• Other Study ID Numbers: 13/1

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No