Microtensile bond strength of composite resin to human enamel prepared using erbium: Yttrium aluminum garnet laser.
The Erbium: Yttrium Aluminum Garnet (YAG) laser used for preparation of cavity can alter the substrate and it could influence the bond strength of enamel. The aim of this in vitro study was to evaluate the influence of Er:YAG laser's energy using microtensile bond test. Three groups were obtained (cavity preparation) and each group was divided into two subgroups (adhesive system). After that the adhesive protocol was performed, sections with a cross-sectional area of 0.8 mm2 (+/-0.2 mm2) were obtained. The specimens were mounted in a universal testing machine (0.5 mm/min). Statistical analysis showed a decrease in bond strength for lased groups (p < 0.01) and when the total-etching adhesive system was used the laser 300 mJ subgroup showed higher bond strength compared to the laser 250 mJ (p < 0.01). It was concluded that the cavities prepared using laser appear less receptive to adhesive procedures than conventional bur-cut cavities.
Delfino
Carina Sinclér
CS
Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil. carinadelfino@usp.br
Souza-Zaroni
Wanessa Christine
WC
Corona
Silmara Aparecida Milori
SA
Palma-Dibb
Regina Guenka
RG
D000269:Adhesives; D000535:Aluminum; D001696:Biomechanical Phenomena; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements; D003743:Dental Enamel / Q000737:chemistry*; D006801:Humans; D007834:Lasers; D015019:Yttrium
D000269:Adhesives; D003188:Composite Resins; D003738:Dental Cements; C503779:yttrium-aluminum-garnet; D015019:Yttrium; D000535:Aluminum