Marginal Micro-infiltration in Class V Restorations Prepared with Er:YAG Laser and High Speed Rotation

Abstract

SUMMARY Objective: to evaluate the marginal micro-infiltration in Class V restorations prepared with Er:YAG laser and high-speed rotation due to the use of re-moisturized substances (primer or distilled water) using conditioning with phosphoric acid at 37%. Thirty, third lower molars were selected and divided into six groups, of which three were prepared with high-speed rotation (I, II, III) and three with Er:YAG laser (IV,V,VI). After preparation, the specimens were conditioned with 37% phosphoric acid and immediately restored according to the protocol established for each group. Groups II and V were re-moisturized with primer before the application of the adhesive system. Groups III and VI were re-moisturized with distilled water and Groups I and IV were not re-moisturized, the adhesive system being applied right after the acid etching. All groups were restored with photopolymerizable composite resin and subjected to the methodology micro-infiltration using 50% silver nitrate. Results: The results showed that the use of re-moisturized substances such as primer and distilled water in cavities prepared with Er:YAG laser may improve the levels of marginal micro-infiltration especially in the dentin. Conclusion: The results suggest that the dentinal surface treatment with distilled water or substances, whose bases are HEMA, before the application of the adhesive system, can provide better humidity conditions for the dentin after irradiation. DESCRITORS Er:YAG laser, microleakage, re-moisture