Dentin bond strength of an adhesive system irradiated with an Nd:YAG laser

作者：Ruschel V C^*; Malta D A M P; Monteiro S Jr

来源：Laser Physics, 2016, 26(11): 116101.

DOI：10.1088/1054-660X/26/11/116101

• lasers
• adhesive
• dentin

The objective of this study was to evaluate the microtensile bond strength of an adhesive system applied to dentin, followed by Nd:YAG laser irradiation. Twenty-two recently extracted third molars were divided into four groups (n = 5). In the G1 and G2 groups, the adhesive system was applied conventionally, and in groups G3 and G4, the adhesive system was irradiated with an Nd: YAG laser (100 J cm(-2)). The specimens were stored in distilled water at 37 degrees C, those in groups G1 and G3 for 24 h, and those in groups G2 and G4 for 3 months. Two teeth from groups G1 and G3 were used for observation of the hybrid layer, using a confocal microscope (n = 1). The teeth were submitted to a microtensile bond strength test. Analysis of the type of fracture was performed using a stereoscope (40x). The results for microtensile bond strength (MPa) and standard deviation (+/- SD) were: G1-31.68 (5.14); G2-37.88 (+/- 5.04); G3-35.32 (+/- 8.79); G4-31.53 (+/- 9.01). There were no significant differences among the groups (p > 0.05). Adhesive failure was predominant in all the groups. The Nd: YAG laser irradiation of the adhesives did not influence dentin bond strength during the periods of 24 h or 3 months of storage in distilled water.

• 出版日期2016-11