The optimal design of connectors in all ceramic fixed partial dentures manufactured from alumina tape.
- Author:
Nam Sik OH
1
;
Han Sung KIM
;
Myung Hyun LEE
;
Keun Woo LEE
Author Information
1. Department of Dentistry, College of Medicine, Inha University.
- Publication Type:Original Article
- Keywords:
All ceramic crown;
Fixed partial denture;
Connector design;
Finite element analysis;
Topology optimization
- MeSH:
Aluminum Oxide*;
Axis, Cervical Vertebra;
Ceramics*;
Denture, Partial, Fixed*;
Finite Element Analysis;
Prostheses and Implants;
Tooth
- From:The Journal of Korean Academy of Prosthodontics
2004;42(2):125-132
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
STATEMENTS OF PROBLEM: All ceramic fixed partial denture cores can be made by the slip casting method and the advanced alumina tape method. The fracture resistance of these core connector areas is relatively low. PURPOSE: The purpose of this study is to standardize the appropriate volumetric figure and location of the connectors in the alumina core fabricated in alumina tape to be used in fixed partial dentures by way of topology optimization. MATERIAL AND METHOD: A maxillary anterior three-unit bridge alumina core with teeth form and surrounding periodontal apparatus model was used to ultimately design the most structurally rigid form of the connector. Loadings from a 0 degree, 45 degrees and 60 degrees to the axis of each tooth were applied and analyzed with the 3-D finite element analysis method. Using the results from these experiments, the topology optimization was applied and the optimal reinforcement layout of connector was obtained and the detail shape in the fixed partial denture core was designed. RESULTS: The modified prosthesis with the form of a bulk in the lower lingual surface of the connector in the event, reduced the stress concentration up to 20% in the 3-D FEA. CONCLUSION: The formation of a bulk in the lower lingual connector area of an alumina core for a fixed partial denture decreases the stress to a clinically favorable measure but does not harm the esthetic point of view. This result illustrates the possibility of clinical application of the modified form designed by the topology optimization method.
