Background: The present study compared glass fibre, zirconia and cast post with different length. Materials & Methods: The present study was conducted on 45 recently extracted permanent incisors. Teeth were divided into 3 groups. Group I comprised of cast post, group II had glass fibre post and group III had zirconia post. The teeth were loaded to fracture in the universal testing machine. Results: The mean failure load in group I at 6 mm was 270.4 N and at 8 mm was 300.8 N, in group I was 144.2 N and 180.4 N, in group III was 218.2 N and 305.1 N. The difference was significant (P< 0.05). The maximum fracture was 8 at 6 mm and 6 at 8 mm root length at apical third in group II. In group II, at cervical region at 6 mm was 10, at 8 mm was 7 and in group III, at cervical region at 6 mm was 8 and at 8 mm was 7. Conclusion: Authors found that there was no effect of increasing the length of posts in all groups on fracture resistance.
Key words: Post, glass fibre, zirconia