Dental and Medical Problems

Dent Med Probl
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ISSN 1644-387X (print)
ISSN 2300-9020 (online)
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Dental and Medical Problems

2018, vol. 55, nr 1, January-March, p. 35–42

doi: 10.17219/dmp/85000

Publication type: original article

Language: English

Creative Commons BY-NC-ND 3.0 Open Access

Influence of crown design and material on chipping-resistance of all-ceramic molar crowns: An in vitro study

Wpływ kształtu i materiału pełnoceramicznych koron trzonowców na odporność na odpryskiwanie – badanie in vitro

Majed Alsarani1,2,A,B,C,D, Grace De Souza3,A,C,E, Amin Rizkalla4,A,C,E, Omar El-Mowafy3,A,C,E,F

1 Faculty of Dentistry, University of Toronto, Canada

2 Faculty of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia

3 Department of Restorative Dentistry, Faculty of Dentistry, University of Toronto, Canada

4 Faculty of Dentistry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Canada

Abstract

Background. All-ceramic restorations have become popular and the trend is ongoing. However, the incidence of chipping within the veneering layer has been a commonly reported failure in clinical practice.
Objectives. The aim of this in vitro study was to evaluate the effect of ceramic crown design (monolithic vs bi-layered) and material on the chipping resistance of molar crowns submitted to compressive cyclic loading.
Material and Methods. Fifty identical epoxy resin replicas of a mandibular first molar with crown preparation were divided into 5 groups (n = 10) as follows: the MLD group – monolithic CAD/CAM lithium-disilicate glass-ceramic (LDGC) crowns; 30 zirconia cores were veneered with either feldspathic porcelain by hand-layering technique (ZHL) or by heat-pressing technique (ZVP), or with milled LDGC veneers and subsequently fused to the cores (ZLD); 10 porcelain-fused-to-metal (PFM) crowns acted as a control group. All crowns were cemented using Panavia® F2.0 resin cement (Kuraray Dental, Tokyo, Japan). After storage in water at 37°C for 1 week, the specimens were subjected to compressive cyclic loading at the mesiobuccal cusp which was tilted at 30°. A load cycle of 50–450 N was used and specimens were maintained in an aqueous environment throughout 500,000 cycles in a universal testing machine (Instron, Norwood, USA). The data was statistically analyzed at 5% significant level with Fisher’s exact test and Kaplan-Meier survival analysis.
Results. Significant differences in survival rates of the specimens used in the groups (p < 0.001) were found. Specimens of the PFM, ZHL and ZVP groups underwent failures at different stages of the 500,000 fatigue cycles, while specimens of the MLD and ZLD groups survived the entire fatigue test. ZHL and ZVP crowns had the worst chipping-resistance, while PFM crowns performed slightly better. The Kaplan-Meier test revealed significantly higher survival rates for the MLD and ZLD specimens compared to the other 3 groups.
Conclusion. The use of LDGC as a monolithic molar crown and as a veneer over a zirconia core resulted in superior resistance to cuspal chipping.

Key words

fatigue, crown, chipping, monolithic, posterior

Słowa kluczowe

badanie zmęczeniowe, korona, odpryski, monolityczny, tylny

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