Journal of the Korean Academy of Pediatric Dentistry 2008;35(4):692-699.
Published online November 30, 2008.
EFFECT OF SURFACE TREATMENTS ON THE REPAIR BOND STRENGTH OF COMPOSITES
Jung-In Choi, Young-Jae Kim, Jung-Wook Kim, Sang-Hoon Lee, Chong-Chul Kim, Se-Hyun Hahn, Ki-Taek Jang
Department of Pediatric Dentistry, College of Dentistry and Dental Research Institute, Seoul National University 
Correspondence:  Ki-Taek Jang,  Tel: 02-2072-3819, Email: jangkt@snu.ac.kr
Received: 11 June 2008   • Accepted: 16 October 2008
Abstract
The purpose of this study was to evaluate the effect of surface treatment on the shear bond strength between new and old composite resin. The prepared resin specimens were separated 6 groups, and each group then received a different surface treatment. Then the repair material was added. Shear bond strengths for repair were measured after 7 days and the results were analyzed by using one way ANOVA. The results were as follows; 1. Group 3, 4(air abrasion) showed significantly higher shear bond strength than Group 1(phosphoric acid)(p<0.05). Group 5, 6(diamond bur) showed higher bond strength than Group 1(phosphoric acid) but not significantly different( p>0.05). 2. Group 2(self-etching adhesive) showed lower shear bond strength than Group 1(phosphoric acid) but not significantly different(p>0.05). 3. There was no statistically significant difference between Group 3(air abrasion) and Group 4(air abrasion+etching). 4. There was no statistically significant difference between Group 5(diamond bur) and Group 6(diamond bur+etching). In conclusion, the surface treatment with air abrasion resulted in higher repair bond strength than other methods. Repair bond strength was not significantly affected by acid etching.
Key Words: Composite resin, Repair, Surface treatment, Shear bond strength


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