Browse > Article

THE OPTIMAL DESIGN OF CONNECTORS IN ALL CERAMIC FIXED PARTIAL DENTURES MANUFACTURED FROM ALUMINA TAPE  

Oh Nam-Sik (Dept. of Dentistry, College of Medicine, Inha University)
Kim Han-Sung (Dept. of Biomedical Engineering, College of Health Science, Yonsei University)
Lee Myung-Hyun (Korea Institute of Ceramic Engineering and Technology)
Lee Keun-Woo (Dept. of Prosthodontics, College of Dentistry, Yonsei University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.42, no.2, 2004 , pp. 125-132 More about this Journal
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 $0^{\circ}$, $45^{\circ}$ and $60^{\circ}$ 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.
Keywords
All ceramic crown; Fixed partial denture; Connector design; Finite element analysis; Topology optimization;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Scherrer S. Mojon P. Belser D, Meyer JM. The Vita Hi-Ceram crown system: A clinical and laboratory investigation. J Dent Res 1988; (Abstract no. 812). 67:214
2 Kim DJ. Lee MH. Kim CE. Fabrication of In-Coram core by sheet forming process. Bioceramics 1997:10:211-4
3 Lee Mh. Kim DJ. Lee DY. et a1. Mech-anical properties of alumina glass dental composites prepared from aqueous based tape casting. Journal of the Korean Ceramic Society 1999: 36(10) :1123-31
4 Yoshinari M. Derand T. Fracture strength of all-ceramic crowns. Int J Prosthodont 1994: 7(4): 3219-38
5 Kamposiora P. Papavasiliou G. Bayne SC. Felton DA Stress concentration in all-ceramic posterior fixed partial dentures. Quintessence Int 1996:27(10) :701-6
6 Oh NS. Lee KW, Lee MH, et al. Marginal Fit of Glass Infiltrated Alumina Core Fabricated from Alumina Tapes. J Korean Acad Prosthodont 1998: 36(6): 832-45
7 Dickinson AJ. Moore BK. Harris RK. Dykema RW. A comparative study of the strength of aluminous porcelain and allceramic crowns. J Prosthet Dent 1989:61(3) :297-304
8 Probster L. Survival rate of In-ceram restorations. Int J Prosthodont 1993:6(3) :259-63
9 Dunn B, Levy MN, Reis bick MH. Improving the fracture resistance of dental ceramic. J Dent Res 1977:56(10):1209-13
10 Oh NS, Kim ES. Lee KW. et al. A new manufacturing method of all ceramic restoration using alumina tape and pre-sentation of clinical cases. J Korean Acad Prosthodont 2000:38(6) :800-5
11 Giordano RA. Dental ceramic restorative systems. Compend Contin Educ Dent 1996:17:779-782.784-6
12 Sobrinho LC. Cattell MJ. Glover RH, Knowles JC. Investigation of the dry and wet fatigue properties of three all-ceramic crown systems. Int J Prosthodont 1998;11 (3) :255-62
13 Levy H. Working with the In-Ceram porcelain system. Prosthese Dentaire 1990:1:44- 5
14 Castellani D. Baccetti T, Giovannoni A. Bernardini U. Resistance to fracture of metal-ceramic and all-ceramic crowns. Int J Prosthodont 1994: 7: 149-54
15 Kim DJ. Lee MH. Mechanical Properties of Tape-Cast Alumina-Glass Dental Composites. J Am Ceram Soc 1999;82(1):3167-72   DOI
16 Andersson M. Oden A. A new all-ceramic crown. A dense-sintered, high-purity alumina coping with porcelain. Acta Odontol Scand 1993:51(1):59-64
17 Fehling AW. Cast connectors as cores for ceramometal pontics on removable partial dentures and for splinting anterior crowns. J Prosthet Dent 1990:63(2):167-71
18 Kim DJ. Lee MH, Lee DY. Han JS. A Comparison of Mechanical Properties of AlI-Ceramic Alumina Dental Crowns Prepared from Aqueous- and Non-Aqueous-Based Tape Casting. 1999;18(1):314-9
19 Dong JK. Luthy H. Wohlwend A. Scharer P. Heat-pressed ceramics: Technology and strength. Int J Prosthodont 1992; 5: 9
20 Peter Pospiech PR, Gerhard Goldhofer and Wolfgang Gernet. All Ceramic resinbonded bridges-A 3-dimensional finite element analysis study. European Journal of Oral Sciences 1996: 104
21 Hondrum SO. O' Brien WJ. The strength of alumina and magnesia core crowns. Int J Prosthodont 1988:1(1): 67-72