1Professor,
2Assisstant Professor,
3Professor and Head of the Department
4Private Practice,
*Corresponding Author: Dr. Jeevarathan J, Professor,
In vitro evaluation of shear bond strength of composite resin bonded to primary enamel which is pretreated using acid etching and E, Cr: YSGG Laser. Qualitative morphological changes in enamel surfaces were observed under a scanning electron microscope.
Sixty extracted human teeth were divided into two groups of 30 each (Groups A and B). In Group A, prepared surface of enamel was etched using 35% phosphoric acid (Scotchbond Multipurpose 3M ESPE). In Group b, enamel surface was etched using Er, Cr: YSGG Laser beam (Waterlase MD, biolase, San Clemente, USA). bonding agent (Adper, single bond 2, 3M ESPE) was applied over the test areas on 20 samples of Groups A and Groups b each light cured. Composite resin core (Filtek z350 XT, 3M ESPE) was made in increments and light cured. The samples were tested for shear bond strength. Remaining 10 samples from each Group were observed under SEM.
The mean shear bond strength with standard deviation values of Group A (18.39 ± 4.75 MPa) and Group B (6.37 ± 2.71 MPa) respectively.
Mean shear bond strength of Group A (Acid etching) was significantly higher than the mean shear bond strength of Group b (Laser etching). SEM observations of laser pretreatment showed microretentive surface with the presence of elevations and depressions not adequate to improve the bond strength as compared to Acid etching
Primary teeth, Acid Etching, Er, CrYSGG, Shear Bond Strength, Laser
