Abstract
Background: Frequently, new types of burs are developed. The purpose of this study was to evaluate the cutting rates of a new diamond and carbide fissure bures on amalgam and composite materials. Materials and Methods: The cutting study was performed on composite and amalgam an specimens the specimens were divided into groups and subgroups according to the types of bur and material of the specimens: Group I subgroup 1, composite specimens (10 diamond fissure burs), Subgroup 2, amalgam specimens (10 diamond fissure burs), Group II subgroup 1, composite specimens (10 carbide fissure burs), Subgroup 2, amalgam specimens (10 carbide fissure burs). Ten cuts were performed with each bar and a total of 400 cutting rates or CRs (mm/sec) were recorded. The CRs were statistically analyzed using analysis of variance test, least significant difference test and student t-test. Results: There was no significant difference (P< 0.5) between CRs of group I for the 10 cuts, while a significant difference (P < 0.5) began to appear between CRs of group II subgroup 1 after cut 7 and in subgroup 2 after cut 8 Conclusion: Both diamond and carbide fissure burs are effective in cutting amalgam and composite materials, but still carbide fissure bure dulls readily.
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