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:: Volume 27, Issue 2 (4-2015) ::
J Iran Dent Assoc 2015, 27(2): 64-69 Back to browse issues page
Effect of marginal design on fracture resistance of IPS e.maxall ceramic restorations: Chamfer versus shoulder finish lines
Asadollah Ahmadzadeh1, Farnoosh Golmohammadi *2, Najmeh Mousavi3
1- Assistant Professor, Department of Prosthodontics, School of Dentistry, Ahwaz University of Medical Sciences. Ahwaz, Iran
2- Assistant Professor, Department of Prosthodontics, School of Dentistry, Kermanshah University of Medical Sciences. Kermanshah, Iran , farnoosh.gol@gmail.com
3- Assistant Professor, Department of Prosthodontics, School of Dentistry, Ghazvin University of Medical Sciences. Ghazvin, Iran
Abstract:   (4136 Views)

Background and Aim: One of the problems of all ceramic restorations is their risk of fracture due to occlusal loads. The aim of the present study was to compare the effect of two marginal designs (shoulder and chamfer) on the fracture resistance of IPS-emax all ceramic restorations.

Materials and Methods: One extracted maxillary first premolar received chamfer 50' marginal preparation (0.8 mm). Twenty impressions were made using poly vinyl siloxane. Then, chamfer was converted to shoulder 90'(1mm). After impression, epoxy resin dies were fabricated. Impressions of each epoxy resin die were made and poured with die stone. Twenty Press crowns and twenty ZirCAD crowns were made on stone dies and ce-mented on resin dies. Then, samples underwent a fracture test in a universal testing ma-chine. Data were analyzed by one-way ANOVA.

Results: The mean fracture resistance was 1426N for the chamfer ZirCAD samples, 1361.3N for the shoulder ZirCAD samples, 1059.9N for the chamfer Press samples and 1295.8N for the shoulder Press samples. One-way ANOVA revealed no difference among groups. (p=0.095).

Conclusion: After porcelain application, marginal design does not affect fracture resis-tance of single IPS-emax posterior crowns. Fracture resistance was approximately the same in Press and ZirPress groups probably due to porcelain application, because in Zir-CAD group fractures occurred in the porcelain prior to the core

Keywords: Chamfer, Shoulder, Fracture resistance, All ceramic, IPS emax
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Type of Study: Orginal | Subject: Porosthodontics
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Ahmadzadeh A, Golmohammadi F, Mousavi N. Effect of marginal design on fracture resistance of IPS e.maxall ceramic restorations: Chamfer versus shoulder finish lines. J Iran Dent Assoc 2015; 27 (2) :64-69
URL: http://jida.ir/article-1-1739-en.html


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Volume 27, Issue 2 (4-2015) Back to browse issues page
Journal of Iranian Dental Association

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