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KMID : 0358920070340040569
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Journal of the Korean Academy of Pedodontics
2007 Volume.34 No. 4 p.569 ~ p.578
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A STUDY OF SHEAR BOND STRENGTH OF ER:YAG LASER-IRRADIATED PRIMARY DENTIN
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Lee Jin-Hwa
Yoo Seung-Hoon
Kim Jong-Soo
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Abstract
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This study was performed to compare the shear bond strength of self etching system and two bottle bonding system with or without laser preparation. Group I was prepared with high speed rotary instrument and L-, group II with Er:YAG laser and L-, group III with Er:YAG laser, 37% phosphoric acid and Single bond, group IV with Er:YAG laser and Single bond and group V with high speed, etching and Single bond. And also observation of the prepared and etched dentin surface were performed under scanning electro-microscope. The possibility of clinical application of laser preparation which might have an advantage to reduce pain for children with less unfavorable noise were evaluated. The results obtained are as follows; 1. Group V showed significantly higher bond strength than other groups. And group IV showed significantly lower bond strength than other groups. 2. There was no significant difference between group I and group III. 3. Group II showed significantly lower bond strength than group I, III, V, but showed significantly higher bond strength than group IV. 4. Under scanning electro-microscope, laser-preparated dentin surface showed high irregularity and no smear layer. The surface showed less irregularities and more exposed dentinal tubules with etching. Laser preparation has many advantages over conventional tooth preparation. But this method showed lower resin bonding strength. Laser preparated tooth surface differed from the conventionally preparated tooth surface. More researches are needed on suitable methods for laser preparated dentin surface.
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KEYWORD
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Shear bond strength, Er:YAG laser, Primary teeth dentin, Dentin bonding system
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