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Information Journal Paper

Title

FATIGUE RESISTANCE AND FAILURE MODE OF ENDODONTICALLY RESTORED PREMOLARS WITH INDIRECT COMPOSITE RESIN RESTORATION-IN VITRO

Pages

  12-21

Abstract

 Background and Aim: The present study aimed at determination of the FATIGUE resistance and FAILURE MODE of cuspreplacing 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 groupl 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 (a=.05). Results: 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. Conclusion: 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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    Cite

    APA: Copy

    AMINIAN, R., TORABZADEH, H., SAFARI, ATEFEH, MOKHTARI, N., & AKBARZADEH BAGHBAN, A.R.. (2010). FATIGUE RESISTANCE AND FAILURE MODE OF ENDODONTICALLY RESTORED PREMOLARS WITH INDIRECT COMPOSITE RESIN RESTORATION-IN VITRO. JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE, 28(1 (83)), 12-21. SID. https://sid.ir/paper/21796/en

    Vancouver: Copy

    AMINIAN R., TORABZADEH H., SAFARI ATEFEH, MOKHTARI N., AKBARZADEH BAGHBAN A.R.. FATIGUE RESISTANCE AND FAILURE MODE OF ENDODONTICALLY RESTORED PREMOLARS WITH INDIRECT COMPOSITE RESIN RESTORATION-IN VITRO. JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE[Internet]. 2010;28(1 (83)):12-21. Available from: https://sid.ir/paper/21796/en

    IEEE: Copy

    R. AMINIAN, H. TORABZADEH, ATEFEH SAFARI, N. MOKHTARI, and A.R. AKBARZADEH BAGHBAN, “FATIGUE RESISTANCE AND FAILURE MODE OF ENDODONTICALLY RESTORED PREMOLARS WITH INDIRECT COMPOSITE RESIN RESTORATION-IN VITRO,” JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE, vol. 28, no. 1 (83), pp. 12–21, 2010, [Online]. Available: https://sid.ir/paper/21796/en

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