| 1507 The Effect of Mineralizing Liquid on the Bond Strength | ||
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C. HUANG, J. CHEN, G. ZHANG, S. WANG, and Y. YANG, Wuhan University, China Objectives: To investigate the effects of mineralizing liquid on dentine bonding. Methods: 40 intact human premolars extracted for orthodontic reasons were used. The superficial occlusal flat dentin were exposed and finished with wet 600-grit silicon carbide paper. The teeth were then separated into 4 groups (A, B,C and D group). The first three groups were etched and restored by the dentin adhesive system Prime & Bond NT (Dentsply DeTrey, German) and composite resin Spectrum TPH (Dentsply DeTrey, German) according to the manufacturer's instructions. The teeth in the last group were immerged in 0.5mol/L NaCl liquid for 48 hours to remove the dentin phosphoprotein, and then were restored. All teeth were sectioned parallel to the long axis of the teeth to obtain the slices with the thickness of 0.9mm. Then the slices in the first three groups were immerged in silicone liquid, artificial saliva and mineralizing liquid respectively, the last group was immerged in the mineralizing liquid. 12 weeks later, the slices in each group were sectioned again to obtain sticks with a cross-sectional area of 0.81mm2. The microtensile bonding strength of the sticks in each group were measured with microtenesile tester. (Biso.co, USA). All data were collected and analyzed by one-way ANOVA. The Ca/P in hybrid layer was evaluated by energy dispersive X-ray spectroscopy microanalyses (S570, Hitachi, Japan). Results: There was a significant difference in microtensile bond strength among 4 groups (P<0.05). The Ca/P in hybrid layer was different when immerged in the mineralizing liquid, but the 0.5mol/L NaCl liquid had no influence on the Ca/P in hybrid layer. Conclusion: The demineralizing dentine in hybrid layer may be remineralized relatively by mineralizing liquid and the microtensile bond strength in dentine-composite bonding system was also increased. The remineralizing capability of hybrid layer might not be increased by 0.5mol/L NaCl liquid. | ||
| Seq #180 - Bond Strength of Composites to Enamel and Dentin - Application, Technique 2:00 PM-3:15 PM, Friday, March 23, 2007 Ernest N. Morial Convention Center Exhibit Hall I2-J | ||
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