Year : 2016

Volume : Volume 6

Issue : Issue 1s

Address for correspondence :
Dr. Anil Kumar P
anilkumar@gmail.com

Abstract

Aim:  This in vitro study compares and evaluate the fracture resistance and fracture patterns of endodontically treated anterior teeth restored with two different esthetic posts namely the glass fibre and zirconia posts. Material and method: Twenty freshly extracted maxillary central incisors free of cracks, caries, fractures, and restorations were selected for the study. The anatomic crowns of all teeth were removed perpendicular to the long axis of the tooth, from the most incisal point to 2mm above the  proximal cementoenamel junction (CEJ), with the use of a water cooled flat end tapered diamond abrasive (Diabur, Mani, India) to simulate grossly destroyed tooth. All the teeth were prepared with a torpedo diamond abrasive to establish a chamfer finish line at the level of cement enamel junction. The standardization followed for post space preparation in teeth are the post length of 13mm length to be prepared in the root. Cementation of fibre post and zirconia post are done. Core was built for all the samples. Ni-Cr crowns are cemented on the samples. All the teeth with post core and coping were embedded in acrylic block for testing purpose. The samples were tested for fracture resistance under static load by using Universal testing machine. Results: Statistical analysis was made with independent student’s T test and P value less than 0.05 was considered significant. Samples with zirconia posts exhibited greater fracture resistance than those with glass fibre posts. However, the differences in the mean values between the two Groups were not statistically significant. This study indicates that both the esthetic posts, namely glass fibre and zirconia posts exhibited similar fracture resistance statistically. Visual inspection of the fracture patterns of the endodontically treated anterior teeth restored with glass fibre and zirconia posts have revealed that use of zirconia posts exhibited 60% of the root fracture while glass fibre posts exhibited 60% of crown fractures. Conclusion: The mean maximum load value for fracture resistance for test samples with zirconia posts was higher than that for the test samples with glass fibre posts.

Keywords: Glass fibre post,  Zirconia posts, Universal testing machine, Fracture resistance.