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[Fatigue resistance and failure mode of endodontically restored premolars with indirect composite resin restoration-in vitro]
Journal of Dental School-Shahid Beheshti Medical Sciences University. 2010; 28 (1): 12-21
in Persian | IMEMR | ID: emr-105523
ABSTRACT
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. 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 [alpha=.05]. All specimens withstood the masticating simulation. The mean fracture strength for groups 1 to 7 were 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. There was no statistically significant difference between two types of resin composite [P=0.203] and load cycles [P=0.298] after zero, 4 and 8 years aging. Within the limitation of this study, restored premolars with indirect composite onlays show fatigue resistance equal to natural tooth up to 8 years after restoration. Furthermore, no statistically significant differences were found between 4 and 8 years of load cycles. Tetric Ceram Z-250 restoration agent showed no effect on the tooth fracture resistance with the most observed fractures to be occur under CEJ with no capability to be restored
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Index: IMEMR (Eastern Mediterranean) Main subject: Bicuspid / Chi-Square Distribution / Composite Resins / Dental Materials / Fatigue / Inlays Language: Persian Journal: J. Dent. Sch.-Shahid Beheshti Med. Sci. Univ. Year: 2010

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Index: IMEMR (Eastern Mediterranean) Main subject: Bicuspid / Chi-Square Distribution / Composite Resins / Dental Materials / Fatigue / Inlays Language: Persian Journal: J. Dent. Sch.-Shahid Beheshti Med. Sci. Univ. Year: 2010