Mathematical analysis of occlusal rest design for cast removable partial dentures
| dc.contributor.author | Luk, N. | |
| dc.contributor.author | Wu, V. | |
| dc.contributor.author | Liang, B. | |
| dc.contributor.author | Chen, Y. | |
| dc.contributor.author | Yip, K. | |
| dc.contributor.author | Smales, R. | |
| dc.date.issued | 2007 | |
| dc.description.abstract | AIMS: To establish the minimum dimensions for a non-precious cast metal occlusal rest by using mathematical analysis. An occlusal rest in a removable partial denture (RPD) provides vertical support and allows occlusal forces to be transmitted through the long axis of the abutment tooth. METHODS: The stress status of an occlusal rest in a posterior tooth-bounded RPD resembles that of a cantilever beam under a uniformly distributed load. A mathematical model based on a short rectangular cantilever beam was derived by using the yield strengths of a cast cobalt-chromium alloy and a cast titanium alloy (Ti-6Al-4V), with an applied static occlusal force of 400 N. RESULTS: For the cobalt-chromium alloy, the minimum rectangular dimensions for a 2.0 mm long occlusal rest are; when the width is 2.0 mm, the depth or thickness should be at least 1.03 mm. For the titanium alloy, the minimum dimensions are; when the width is 2.0 mm, the depth or thickness should be at least 0.85 mm. A decrease in the occlusal width will increase the bending stress, requiring a thicker rest for compensation, which may lead to dentin exposure during the rest seat preparation. CONCLUSION: The mathematical analysis found that the traditional spoon-shaped occlusal rest seat dimensions comply with the mechanical requirements for non-precious cast metal occlusal rests in RPDs. | |
| dc.description.uri | http://www.ncbi.nlm.nih.gov/pubmed/17378456?dopt=Abstract | |
| dc.identifier.citation | European Journal of Prosthodontics and Restorative Dentistry, 2007; 15(1):29-32 | |
| dc.identifier.issn | 0965-7452 | |
| dc.identifier.uri | http://hdl.handle.net/2440/43160 | |
| dc.language.iso | en | |
| dc.publisher | F D I World Dental Press Ltd. | |
| dc.title | Mathematical analysis of occlusal rest design for cast removable partial dentures | |
| dc.type | Journal article | |
| pubs.publication-status | Published |