Journal of Conservative Dentistry
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Year : 2014  |  Volume : 17  |  Issue : 4  |  Page : 320-324

Comparison of shear bond strength of composite resin to enamel surface with laser etching versus acid etching: An in vitro evaluation

1 Department of Conservative Dentistry and Endodontics, Vasantdada Patil Dental College and Hospital, Kavalapur, Sangli, Maharashtra, India
2 School of Dental Sciences, Krishna Institute of Medical Sciences Deemed University, Malakapur, Karad, Maharashtra, India

Correspondence Address:
Upendra A Hoshing
Department of Conservative Dentistry and Endodontics, Vasantdada Patil Dental College and Hospital, Kavalapur, Sangli - 416 306, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.136438

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Introduction: The aim of the study is in vitro evaluation of the shear bond strength of composite resin bonded to enamel which is pretreated using acid etchant and Er,Cr:Ysgg. Materials and Methods: 40 extracted human teeth were divided in two groups of 20 each (Groups A and B). In Group A, prepared surface of enamel was etched using 37% phosphoric acid (Scotchbond, 3M). In Group B, enamel was surface treated by a an Er, Cr: YSGG laser system (Waterlase MD, Biolase Technology Inc., San Clemente, CA, USA) operating at a wavelength of 2,780 nm and having a pulse duration of 140-200 microsecond with a repetition rate of 20 Hz and 40 Hz. Bonding agent ((Scotchbond Multipurpose, 3M) was applied over the test areas on 20 samples of Groups A and B each, and light cured. Composite resin (Ceram X duo Nanoceramic restorative, Densply) was applied onto the test areas as a 3 × 3 mm diameter bid, and light cured. The samples were tested for shear bond strength. Results: Mean shear bond strength for acid-etched enamel (26.41 ± 0.66MPa, range 25.155 to 27.150 MPa) was significantly higher (P < 0.01) than for laser-etched enamel (16.23 ± 0.71MPa, range 15.233 to 17.334 MPa). Conclusions: For enamel surface, mean shear bond strength of bonded composite obtained after laser etching were significantly lower than those obtained after acid etching.

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