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Comparison of Shear Bond Strength of Composite Resin to Enamel Surface With Laser Etching Versus Acid Etching: An in Vitro Evaluation

Comparison of Shear Bond Strength of Composite Resin to Enamel Surface With Laser Etching Versus Acid Etching: An in Vitro Evaluation

Upendra A Hoshing, Suvarna Patil, Ashish Medha, Siddhesh Dattatray Bandekar

J Conserv Dent. 2014 Jul;17(4):320-4.

PMID: 25125842

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS75125	Chromium etchant			Price

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