The Effect of Cutting Efficacy of Diamond Burs on Microleakage of Class V Resin Composite Restorations Using Total Etch and Self Etch Adhesive Systems

Abstract

Objective: In this study, the effect of bur cutting efficacy was evaluated on microleakage
of class V composite restorations with two adhesive systems.
Materials and Methods: Class V cavities were produced on sound extracted human teeth,
which had been assigned randomly to one of six groups (N=15) as follows: Groups 1 and
6 were prepared using used rough diamond bur; Group 2 and 5 were prepared using new
rough diamond bur; Group 3 and 4 were prepared using soft diamond bur. After application
of Single Bond (3M Dental Product, USA) in groups 4,5 and 6 and Clearfil SE Bond [
Kurary Medical Inc. Japan] in groups 1,2 and 3, all cavities were restored with composite
resin. The teeth were thermocycled and microleakage was evaluated by dye penetration.
Kruskal-Wallis and Mann-Whitney tests with Bonferroni's correction were used for statistical
analysis.
Results: The results showed that gingival margins significantly leaked more than occlusal
margins for all bur types and bonding systems. Using the same adhesive system in gingival
margins, significant difference was seen between bur types and using the same bur
type in occlusal margins, there was a significant difference between the two types of adhesive
systems.
Conclusion: Cutting efficiency of bur had a great effect on microleakage of resin composite
restorations. So long term use of burs may result in an increase in microleakage of
composite resin restorations.