Journal of the Korean Academy of Pediatric Dentistry 2009;36(3):348-357.
Published online August 31, 2009.
MICRO-TENSILE BONDING STRENGTH OF REGIONAL PRIMARY MOLAR DENTIN
Jung-Eun You2, Yeong-Chul Choi1, Sung-Chul Chio1, Jae-Hong Park1
1Department of Pediatric Dentistry, College of Dentistry, Kyung-Hee University
2Seoul Adventist Dental Hospital 
Correspondence:  Yeong-Chul Choi,  Tel: 02-958-9373, Email: choiyc@khu.ac.kr
Received: 16 January 2009   • Accepted: 16 June 2009
Abstract
The purpose of this study was to evaluate the micro-tensile bond strength (μTBS) of four luting resin to regional dentin of human primary teeth. Dentin from non-carious primary molars were prepared from different regions (s, superficial dentin; d, deep dentin; c, cervical dentin), and divided into groups based on anatomical locations and types of luting resins (Scotchbond Multi-purpose : SB ; One-Step : OS ; AdheSE Bond : ASE ; G-Bond : GB) : SB-s, SB-d, SB-c; OS-s, OS-d, OS-c; ASE-s, ASE-d, ASE-c ; GB-s, GB-d, GB-c. Luting resins were used according to the manufacturers' instructions, to bond Light-CoreTM Core Build-Up Composite) to the exposed dentin specimens in the light-curing mode. After storage for 1 day, μTBS was tested at a cross-head speed of 1 mm/min. Data were analyzed with T-test and two-way ANOVA. The bonding interface and fractography analyses were performed with SEM. The results were as follows : 1. μTBS to superficial dentin was significantly higher than to deep dentin for SB(p<0.05). But there were no significant differences in regional μTBS among OS, ASE, GB(p>0.05). 2. There were no significant differences in μTBS to superficial dentin among each groups. But, in deep dentin, μTBS of SB-d was significantly lower than those of OS-d, ASE-d, and GB-d(p<0.05). μTBS of OS-d was significantly higher than those of GB-d(p<0.05), but there were no significant differences in μTBS of ASEd. There were no significant differences among μTBS of ASE-d, OS-d, and GB-d.
Key Words: Micro-tensile bonding strength, primary tooth, composite resin, dentin adhesives


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