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Gravity-induced stresses by an obturator prosthesis.
B Schwartzman1, A A Caputo, J Beumer
1Biomaterials Science Section, University of California, School of Dentistry, Los Angeles.
The Journal of Prosthetic Dentistry
|October 1, 1990
Summary
Reconstructing maxillae and paranasal sinus tumors with obturator prostheses is challenging. Photoelastic analysis revealed that I-bar and circumferential retainers caused the most stress, while swinglock and light wire designs were better.
Area of Science:
- Oral surgery
- Biomedical engineering
- Prosthodontics
Background:
- Reconstruction following maxillae and paranasal sinus tumor resection presents significant challenges.
- Obturator prostheses are crucial for restoring function but are subject to gravitational forces.
- Understanding stress distribution is vital for prosthesis design and patient outcomes.
Purpose of the Study:
- To photoelastically analyze gravity-induced stresses in various obturator prosthesis framework designs.
- To compare the stress transmission of different retainer types on remaining oral structures.
Main Methods:
- Photoelastic stress analysis was employed to simulate gravity-induced forces.
- Various obturator prosthesis framework designs were investigated.
- Stress patterns were evaluated for different retainer configurations.
Main Results:
- Frameworks utilizing I-bar and circumferential retainers with buccal retention exhibited the most severe stress.
- Swinglock and light wire retainers demonstrated intermediate levels of generated stress.
- The design of the prosthesis framework significantly influences stress distribution.
Conclusions:
- Obturator prosthesis framework design impacts stress transmission to oral structures.
- I-bar and circumferential retainers may lead to higher stress concentrations.
- Swinglock and light wire retainers appear to distribute stress more favorably.