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:: Volume 28, Issue 1 (Spring 2010) ::
J Dent Sch GYEAR__, 28(1): 12-21 Back to browse issues page
Fatigue resistance and failure mode of endodontically restored premolars with indirect composite resin restoration-In Vitro
Roya Aminian Dr., Hassan Torabzadeh Dr., Atefe Saffari Corresponding Author: Dr. * , Nasrin Mokhtari Dr., Alireza Akbarzadeh Bagheban Dr.
2Assistant Professor , atefe_saffari@yahoo.com
Abstract:   (10527 Views)

Background and Aim: The present study aimed at determination of the fatigue resistance and failure mode of cusp-replacing onlays in endodontically treated premolars using indirect composite resin restorations.

Materials and Method: In this experimental study, 84 human premolars were randomly divided into 7 groups of 12. These groups were prepared as follows: Intact teeth used in group1 as control, the second group covers the endodontically treated teeth, restored with indirect onlays using Z-250 composite resin, the next two groups (i.e. 3,4) were similar to the second group, but subjected to 1 and 2 million fatigue load cycles, respectively. Groups 5, 6, 7 were similar to groups 2, 3, 4, respectively, however, in these groups Tetric Ceram used as the restorative material. All specimens were loaded using a Universal Testing Machine until fracture occurred and the mode of failure observed with naked eye. Kruskal-Wallis and Chi-Square tests were used to analyze the data (α=.05).

Results: All specimens withstood the masticating simulation. The mean fracture strength for groups 1 to 7were: 1276.92, 1269.05, 1217.80, 1188.13, 1228.97, 1127.86, 1105.58, respectively. No statistically significant differences were found between the groups in fracture strength and failure mode.

Conclusion: Within the limitation of this study, no statistically significant differences in fracture strength were found between sound teeth and composite onlays that were subjected to 1 and 2 million fatigue load cycles.

J Dent Sch 2010 28(1): 3

Keywords: Cuspal coverage, Indirect resin composite, Fatigue, Failure mode
Full-Text [PDF 271 kb]   (1640 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2010/03/16
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Aminian R, Torabzadeh H, Saffari A, Mokhtari N, Akbarzadeh Bagheban A. Fatigue resistance and failure mode of endodontically restored premolars with indirect composite resin restoration-In Vitro. J Dent Sch. 2010; 28 (1) :12-21
URL: http://jds.sbmu.ac.ir/article-1-772-en.html


Volume 28, Issue 1 (Spring 2010) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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