The effect of extending the head length of carbide fissure bur on it's effectiveness in cutting dentin

الملخص EN

Extending the head length of carbide fissure bur is one of the major trends in bur design.

The Aim of study was to evaluate the effectiveness of one of the major trends in bur design which is the extended head length carbide fissure bur, in cutting dentin.

Materials and methods: The cutting of extended head length (EHL) and non extended head length (NEHL) carbide fissure burs were evaluated on dentin specimens mounted in acrylic blocks.

The specimens were divided into two groups: Group I Cutting performed with NEHL carbide fissure bur (10 burs), Group II Cutting performed with EHL carbide fissure bur (10 burs).

Ten cuts were performed with each bur and a total of 200 cutting rates or CRs (mm/sec) were recorded.

The CRs were statistically analyzed using analysis of variance (ANOVA) test, least significant difference (LSD) test, and student t-test.

Results: A significant difference (P< 0.5) appeared between CRs of group I after cut 7 and in group II after cut 2.

Conclusion: Although, extending the head length of carbide fissure bur enhances it's cutting effectiveness, but such a bur is readily dulled during cutting procedure