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In vivo mandibular elastic deformation during clenching on pivots
1School of Stomatology, Peking University, Beijing, China, Tokyo Medical and Dental University, Tokyo, Japan. janqi@263.net
Journal of Oral Rehabilitation
|February 22, 2002
Summary
Mandibular deformation during unilateral molar clenching can cause small, but potentially significant, forces on dental prostheses. This effect is negligible for natural teeth but may impact implant-supported bridges.
Area of Science:
- Biomaterials Science
- Dental Mechanics
- Biomechanics
Background:
- Long span bridges can fail due to abutment issues.
- Mandibular elastic deformation's impact on abutments is understudied.
- This deformation may create distortion forces on prostheses.
Purpose of the Study:
- To measure human mandibular arch elastic deformation during clenching.
- To assess the influence of this deformation on abutment and prosthesis fit.
Main Methods:
- Utilized charge-coupled device (CCD) cameras.
- Employed an image analyzing system to measure deformation.
- Subjects clenched on canines and second molars.
Main Results:
- No deformation observed during canine or bilateral molar clenching.
- Unilateral second molar clenching caused upward/inward movement of the non-pivot side.
- A 0.2 mm decrease in distance between measurement points was recorded.
Conclusions:
- Mandibular deformation magnitude is below the periodontal membrane's limit.
- Deformation's influence is negligible for natural root-supported bridges.
- Implant-supported bridges may require consideration of mandibular deformation.
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