Effect of Er: YAG Laser on Cavity Preparation and Surface Treatment in Terms of Microleakage ZC42-ZC46
Dr. Yeliz Guven,
Istanbul University, Faculty of Dentistry, Deprtment of Pedodontics Capa 34093, Istanbul, Istanbul, Turkey.
Introduction: Er:YAG laser is one of the most preferred laser types used in preparation of dental hard tissues. Since lased dentin surfaces have significantly different characteristics when compared to bur-prepared surfaces, adhesion performance of adhesive systems may differ, too. Microleakage is an important determinant in assessing the success of restorative materials and cavity preparation methods.
Aim: The aim of this study was to assess the microleakage of three different adhesive systems in Er:YAG laser and bur prepared cavities.
Materials and Methods: Cavities prepared either with Er:YAG laser or diamond bur were randomly assigned to eight groups (n=10): Group 1: Laser preparation+Clearfil Tri-S (C3S) Bond; Group 2: Laser preparation+Adper SE Plus (SE) Bond; Group 3: Laser preparation+ laser etching+ Adper Single Bond 2 (SB2); Group 4: Laser preparation+ acid etching+ SB2; Group 5: Laser preparation+SB2 (no etching); Group 6: Bur+acid etching+SB2; Group 7: Bur+C3S; Group 8: Bur+SE. The groups prepared conventionally (Groups 6-8) served as control groups. The teeth/restoration interfaces were assessed for dye penetration by a stereomicroscope and an image analysis program. The data was analysed by Kruskal Wallis and Mann-Whitney U tests.
Results: The highest microleakage was observed in the gingival interface of Group 5 and the lowest microleakage was seen in the occlusal interface of Group 3 and Group 6. When the effects of laser and bur preparation methods on occlusal and gingival microleakage levels were compared, the statistically significant difference was found between the SE Bond-applied groups (Groups 2 and 8). SE Bond has demonstrated significantly less microleakage in Er:YAG laser prepared cavities than bur prepared cavities.
Conclusion: Interaction pattern of the adhesive systems with the lased substrate can differ from those with the conventional ones and particular characteristics of the adhesive systems have a strong influence on the success of the resinâ€“dentin bond.