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COMPARATIVE STUDY OF FRACTURE STRENGTH DEFENDING ON THE THICKNESS OF SOME ALL CERAMIC CORES  

Kim Doo-Yong (Department of Dentistry, College of Medicine, Hanyang University)
Lee Young-Soo (Department of Dentistry, College of Medicine, Hanyang University)
Park Won-Hee (Department of Dentistry, College of Medicine, Hanyang University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.42, no.1, 2004 , pp. 49-57 More about this Journal
Abstract
Statement of problem : The increased awareness of esthetics in dentistry has brought the esthetic consideration in prosthetic restorations . Dental ceramics offer better esthetics for use of prosthetic restorations. Unfortunately, dental ceramic materials are not always the most suitable candidate materials since their inherently brittle nature. In recent years, basic research in ceramic science has led to the recognition or several approaches to strengthen and to enhance esthetics of ceramics. Several all ceramic systems use ceramic core and porcelain build up structures . Ceramic cores influence to strength of all ceramic crowns . So the strength of ceramic cores is important to all ceramic crowns. Purpose : The purpose of this study is to estimate the flexural strength of ceramic cores in some all ceramic systems. Material and method : A biaxial flexure test was conducted on three groups(Cergo, Empress 2, In-Ceram). Each group consisted of 30 discs of nearly identical dimension with a 0.5mm, 1.0mm, 1.5mm thickness and 12mm in diameter. The fracture load was recorded by Instron. Analysis of valiance(ANOVA) and Tukey's tests were performed using SAS statistical software. Results : 1.5mm thickness of specimens were significantly stronger than 0.5mm and 1.0mm thickness of specimens in Cergo and In-Ceram. But each sepecimen group of Empress 2 was no significantly strength by thickness. In order of In-Ceram, Empress 2 and Cergo has significantly stronger strength in the same thickness. Conclusion : In-Ceram is the strongest ceramic material in 3 materials. All the materials can be used according to the required characters.
Keywords
All ceramic; Flexural strength; Thickness; Empress2; In-Ceram; Cergo;
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  • Reference
1 McLean JW. High strength ceramics . Quintessence lnt 1987:18(2):97-106
2 Bae JS. Yang MS. Comparison of color and opacity of copy-milled In-Ceram alumina core and spinell core. J Korean Acad Prosthodont 1999: 37: 756-766
3 Cattell MJ, Knowles JC, Clarke RL, Lynch E, The biaxial flexural strength of tow pressable ceramic system. J Dent 1999:27:183-196
4 Seghi RR, Daher T, Relative flexural strength of dental restorative ceramics. Dental Matr 1990:6:181-184
5 Lee SK, Wilson PR, Fracture strength of all-ceramic crowns with varying core elastic moduli. Aust Dent J 2000:45(2):103-107
6 Oh SC, Dong JK, Luthy H. Scharer P, Flexure strength and microstructure of IPS Empress 2 glass-ceramic on heat-pressing and heat treatments. J Korean Acad Prosthodont 2000;38(5):575-582
7 Zeng K, Oden A, Rowcliffe D, Flexure test on dental ceramics. lnt J Prosthodont 1996;9:434-439
8 Hwang JW. Yang JH. Lee SH. Chung HY. A Study on fracture strength of conventional and copy-milled In-Ceam crowns. J Korean Acad Prosthodont 1997: 35(2):417-430
9 Stephen F, Michael A, William M, A comparison of glazed and polished dental porcelain. In J Prosthodont 1989:2:524-529
10 Kelly J. Nishimura I. Campbell S. Ceramics in dentistry : Historical root and perspective. J Prosthet Dent 1996;75:1832
11 Koh JW, Yang JH. Lee SH, Influence of thickness of Empress 2 ceramic on fracture strength. J Korean Acad Prosthodont 2000:38:446-460
12 Sobrinho LC, Cattell MJ, Glover RH. Cknowles JC, Investigation of the dry and wet fatigue properties of three all-ceramic crown systems. Int J Prosthodont 1998;11:255-262   PUBMED
13 Nuttal EB. Factors influencing success of porcelain jacket restoration. J Prosthet Dent 1961;11:743-248   DOI
14 Jager N, Feilzer AJ, Davidson CL, The influence of surface roughness on porcelain strength. Dental Materials 2000;16:381-388
15 Fairhurst CW, Lockwood PE, Ringle RD, Thompson WO, The effect of glaze on porcelain strength. Dent Mater 1992;8:203-207
16 Baharav H. Laufer B, Pilo R. Cardash HS, Effect of glaze thickness on the fracture toughness and hardness of alumina-reinforced porcelain. J Prosthet Dent 1999;81:515-519   DOI   ScienceOn
17 Kern M, Fechtig T, Strub J, Influence of water storage and thermal cycling on the fracture strength of all-porcelain, resin-bonded fixed partial dentures. J Prosthet Dent 1994:71:251-256
18 Friedlander LD, Munoz CA, Doodacre DJ, The effect of tooth preparation design on the breaking strength of Dicor crowns. Part1. Int J Prosthodont 1990;3:159-167   PUBMED
19 Kelly JR. Perspective on strength. Dent Mater 1995;11:103-110   DOI   ScienceOn
20 Sozio RB. Riley EJ. The shrink-free ceramic crown. J Prosthet Dent 1983;49:182187
21 Campbell SD. A comparative strength study of metal-ceramic and all ceramic materials: modulus of rupture. J Prosthet Dent 1989;62:476-469   DOI   ScienceOn
22 Doyle MG. Goodacre CJ. Munoz CA. Andres CJ. The effect of tooth preparation design on the breaking strength of Dicor crowns. Part3. lnt J Prosthodont 1990: 3:327-340
23 Coffey JP, Anusavice KJ, Dehoff PH, Lee RB, Influence of contraction mismatch and cooling rate on flexural failure of PFM system. J Dent Res 1988:67:61-65
24 Dong JK, Oh SC, Kim SD, Fracture strength of theIPS Empress crown : The effect of occlusal depth and axial inclination on upper first premolar crowns. J Korean Acad Prosthodont 1999:37(1):127-133
25 Cho BW. New ceramic restoration. Jeesung 1998
26 Ju TH. Oh SC. Dong JK. A Study on the fitness of the IPS Empress ceramic crown according to margin type. J Korean Acad Prosthodont 1998: 36: 846-857
27 Machert JR Jr. Russel C. Leucite crystallization of a heat-pressed dental ceramic. Int J Prosthodont 1996:9:261-265
28 Zeng K, Oden A, Rowcliffe D, Flexure test on dental ceramics. Int J Prosthodont 1996:9:434-439
29 Rinke S. Huls A. Marginal accuracy and fracture strength and conventional and copy millid all-ceramic crowns. lnt J Prosthet 1995;8:303-310
30 Bryant R W, Mahler DB, Modulus of elasticity in bending of composites and amalgams. J Prosthet Dent 1986:56:243-248
31 Probster L. Survival rate of In-Ceram restoration. Int J Prosthodont 1993:259-263
32 Russel A. Giordano II, Pelletier L, Campbell S, Pober R. Flexural strength of an infused ceramic, glass ceramic, and feldspathic porcelain. J Prosthet Dent 1995:73:411-418
33 Bailey LF. Bennett RJ. Dicor surface treatments for enhanced bonding. J Dent Res 1988;67:925-931   DOI   PUBMED   ScienceOn
34 Russel AG, Giordano II, Campbell S, Pober R. Flexural strength of feldspathic porcelain treated with ion exchange, overglaze, and polishing. J Prosthet Dent 1994:71:468-472
35 Doyle MG. Goodacre CJ. Munoz CA. Friedlander LD. The effect of tooth preparation design on the breaking strength of Dicor crowns. Part2. lnt J Prosthodont 1990;3:241-248