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Vertical dimension increases in the adult rhesus monkey: a pilot study
D A Curtis1, S Kapila, T Curtis
1University of California, School of Dentistry, San Francisco.
The Journal of Prosthetic Dentistry
|May 1, 1992
Summary
Increasing vertical dimension of occlusion with splints did not significantly alter mandibular bone density or cause major dentoalveolar changes in rhesus monkeys.
Area of Science:
- Dental Science
- Orthodontics
- Temporomandibular Joint Disorders
Background:
- Attempts to increase vertical dimension of occlusion (VDO) may lead to tooth impaction and temporomandibular joint (TMJ) bone changes.
- Previous research indicates potential adverse effects, necessitating further investigation into specific biomechanical impacts.
Purpose of the Study:
- To investigate the effects of increased VDO on mandibular bone density in adult rhesus monkeys.
- To evaluate dentoalveolar changes, including tooth impaction and periodontal ligament (PDL) alterations, following VDO increase.
Main Methods:
- Mandibular cobalt chromium splints were used to increase VDO in two rhesus monkeys; five served as controls.
- Computed tomography (CT) assessed bone density at five mandibular levels after 3 months.
- Lateral cephalometric radiographs and diagnostic casts evaluated dentoalveolar changes and tooth impaction.
Main Results:
- No statistically significant differences in mandibular bone density were observed between the splinted group and controls.
- Minimal dentoalveolar changes were noted, with no significant tooth impaction reported.
Conclusions:
- Increasing VDO using 3mm splints in adult rhesus monkeys does not appear to significantly affect mandibular bone density.
- The applied VDO increase resulted in minimal dentoalveolar changes, suggesting a potentially safe range for this intervention in the short term.