Association of Force Distribution and Bone Resorption

Study Overview
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Brief Summary
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To investigate the residual ridge resorption at anterior and posterior maxillary and posterior mandibular ridges among conventional complete dentures and implant overdenture wearers, and determine its association with the relative occlusal forces distribution, treatment groups and other patient variables.

Detailed Description
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A total of forty-six edentulous patients participated in this clinical study divided into two groups as following; complete denture group (CD) consists of 23 patients wearing conventional complete dentures and another Implant overdenture group (IOD) consists of 23 patients wearing mandibular complete overdenture with 2 implants. Two panoramic radiographs at baseline and in a follow-up to 7 years were used to measure the ratio of bone changes between the anatomical bone area and the reference area in the maxillary and the mandibular ridges. The occlusal contacts percentage of force in maximum intercuspation anteriorly and posteriorly were recorded for both groups by using T-Scan III system. Oral and written information in English or Malay language, regarding the study, was provided and written consent obtained before enrolment.

Official Title
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Association of Occlusal Force Distribution and Bone Resorption in Implant Supported Overdentures

Conditions
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Bone Resorption

Intervention / Treatment
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* Radiation: Panoramic Radiograph
* Device: T-Scan III occlusal system


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients wearing mandibular IODs opposing conventional maxillary CDs. Patients wearing conventional maxillary and mandibular CDs. Clearly visible anatomic landmarks of the panoramic radiography image. Exclusion Criteria: Patients with a history of temporomandibular joint dysfunction.

Ages Eligible for Study
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Minimum Age: 49 Years
Maximum Age: 89 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: Basic Science
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: CD group<br>Panoramic Radiographs and T-Scan III occlusal system | Radiation: Panoramic Radiograph<br>* Measurement of bone resorption<br>Device: T-Scan III occlusal system<br>* Recording percentage of force in maximum intercuspation<br>|
| Active Comparator: IOD group<br>Panoramic Radiographs and T-Scan III occlusal system | Radiation: Panoramic Radiograph<br>* Measurement of bone resorption<br>Device: T-Scan III occlusal system<br>* Recording percentage of force in maximum intercuspation<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Residual ridge resorption | To estimate residual ridge resorption in patients wearing implant overdentures and complete dentures using area index radiography method. | 7 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Occlusal force distribution | To measure the percentage of occlusal force distribution in patients wearing implant overdentures and complete dentures using T-scan III occlusal analysis device. | 1 year |