| ORIGINAL ARTICLE |
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| Year : 2011 | Volume
: 29
| Issue : 2 | Page : 140-143 |
Comparative evaluation of shear bond strength of composite resin bonded to acid etched or Nd:Yag lased enamel
Mridula Goswami, Asha Singh
Department of Pediatric Dentistry, Govt. Dental College and Hospital, Mumbai, India
Correspondence Address:
Mridula Goswami
Department of Pediatric Dentistry, Maulana Azad Institute of Dental Sciences, MAMC Complex, BS Zafar Marg, New Delhi-110 002
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0970-4388.84687
Aims: In vitro evaluation of the shear bond strength of composite resin bonded to enamel which is pretreated using acid etchant or pulsed Nd:YAG. Qualitative morphological changes in enamel surfaces were observed under a scanning electron microscope (SEM). Materials and Methods: 60 extracted human teeth were divided in two groups of 30 each (Groups A and B). In Group A, prepared surface of enamel was etched using 35% phosphoric acid (Scotchbond, 3M). In Group B, enamel was surface treated by a surgical Nd:YAG laser beam (Medilas 4060 Fibertom) at 0.8 W, 10 Hz, for 10 s with 80 mJ/pulse power. Bonding agent (single bond dental adhesive, 3M) was applied over the test areas on 20 samples of Groups A and B each, and light cured. Composite resin (Z 100, 3M) was applied onto the test areas as a 3 mm diameter cylinder, and light cured. The samples were tested for shear bond strength. Remaining 10 samples from each group were observed under SEM for morphological changes. Results: The mean shear bond strength was 20.00 MPa ( 1.93) and 13.28 MPa (1.97) for Group A and B, respectively. The difference in mean values was statistically significant between Groups A and B (P<0.001). Under SEM, Group A showed typical honeycomb appearance and Group B showed bubble-like cavities. Conclusions: In enamel, acid etch technique showed higher shear bond strength.
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