The use of laser for teeth etching has been recommended in some researches. This study was carried out to compare the bond strength of composite resin to dentin following laser and conventional acid etching.
Methods:
Dentinal sections of intact human third molar teeth were prepared and divided into two groups of 25 each. In group A, samples were etched by 1 watt. Er, Cr: YSGG laser (Biolase).The samples of the group B were etched using %37 phosphoric acid and were used as control. bonding agent was applied as manufacturer’s instruction (single bond-3M,USA ), composite rods (Z100-3M,USA) with dimensions of 0.7X1 mm were bonded to prepared tooth surface .Micro-shear bond strength was evaluated (Bisco Inc USA) and the data recorded as Mpa. Mean and standard deviation was calculated and data subjected to Student t-test for statistical analysis.
Results:
Micro-shear bond strength in group A was 22.44 ± 5.41Mpa, and 26.15± 4.77 Mpa in group B. Group B had significantly higher mean bond strength than group A (P<0.05).
Conclusions:
It can be concluded that laser etching is not capable of producing similar bond strength as the conventional method.