Fracture load and marginal fit of shrinkage-free ZrSiO4 all-ceramic crowns after chewing simulation

Okutan, M., Heydecke, G., Butz, F. and Strub, J. R. (2006) Fracture load and marginal fit of shrinkage-free ZrSiO4 all-ceramic crowns after chewing simulation. Journal of Oral Rehabilitation, 33 11: 827-832. doi:10.1111/j.1365-2842.2006.01637.x

Author Okutan, M.
Heydecke, G.
Butz, F.
Strub, J. R.
Title Fracture load and marginal fit of shrinkage-free ZrSiO4 all-ceramic crowns after chewing simulation
Journal name Journal of Oral Rehabilitation   Check publisher's open access policy
ISSN 0305-182X
Publication date 2006-11-01
Sub-type Article (original research)
DOI 10.1111/j.1365-2842.2006.01637.x
Open Access Status DOI
Volume 33
Issue 11
Start page 827
End page 832
Total pages 6
Place of publication United Kingdom
Publisher Blackwell Publishing
Language eng
Subject C1
320899 Dentistry not elsewhere classified
730112 Oro-dental and disorders
1105 Dentistry
Abstract The aim of this in vitro study was to evaluate the fracture load and marginal accuracy of crowns made from a shrinkage-free ZrSiO4 ceramic cemented with glass-ionomer or composite cement after chewing simulation. Thirty-two human mandibular molars were randomly divided into two groups. All teeth were prepared for and restored with shrinkage-free ZrSiO4 ceramic crowns (Everest HPC (R), KaVo). The crowns of group A (N = 16) were luted to the teeth using KetacCem (R) and group B (N = 16) were adhesively cemented using Panavia (R) 21EX. Measurements of the marginal accuracy before and after cementation were made using replicas and an image analysis system. All specimens were exposed to 1.2 million cycles of thermo-mechanical fatigue in a chewing simulator. Surviving specimens were subsequently loaded until fracture in a static testing device. Fracture loads (N) were recorded. All specimens survived chewing simulation. The mean fracture loads (+/- s.d.) were Group A, 1622 N (+/- 433); group B, 1957 N (+/- 806). There was no significant difference between the two groups (P > 0.05). The marginal gap values before cementation were (mean +/- s.d.): Group A, 32.7 mu m (+/- 6.8); group B, 33.0 mu m (+/- 6.7).The mean marginal gap values after cementation were (+/- s.d.): Group A, 44.6 mu m (+/- 6.7); group B, 46.6 mu m (+/- 7.7). The marginal openings were significantly higher after cementation for both groups (P < 0.05). All test groups demonstrated fracture load and marginal accuracy values within the range of clinical acceptability.
Keyword Ceramic Crowns
Zrsio4 Ceramics
Fracture Load
Survival Rate
Marginal Fit
Dentistry, Oral Surgery & Medicine
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
2007 Higher Education Research Data Collection
School of Dentistry Publications
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Citation counts: TR Web of Science Citation Count  Cited 23 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 22 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 18:46:31 EST