This study has been focused on a comparison between the shear bond strength of a composite resin attached to dental enamel surface, after a 35% phosphoric acid etching and after a Nd:YAG laser irradiation with 165.8 J/cm2 of energy density per pulse. After etching and attaching resin to these surfaces, the specimens were thermocycled and then underwent the shearing bond strength tests at a speed of 5 mm/min. The results achieved, after statistical analysis with Student's t-test, showed that the adhesion was significantly greater in the 35% phosphoric acid treated group than in the group treated with the Nd:YAG laser, thus demonstrating the need for developing new studies to reach the ideal parameters for an effective enamel surface conditioning as well as specific adhesives and composite resins when Nd:YAG laser is used
The etching pattern for the enamel surface of human teeth was compared using 35% phosphoric acid and the use of the Nd: YAG laser with potency varying from 0.75w to 1.00w, and 15pps during 90 seconds. The formation of tags was also observed in two groups, one treated with 35% phosphoric acid and the other with Nd: YAG laser, and both received DELTON (J&J) pit and fissure sealant. The samples were examinated by scanning electron microscopy (SEM), which showed that the patterns obtained by the phosphoric acid etching were uniform presenting a great quantity of microporosities thus being considered superior to the pattern obtained by the Nd:YAG laser etching, either by 1.00w or 0.75w. The formation of tags showed better results in the group treated by the phosphoric scid than in that treated with Nd:YAG laser.
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