| Autor: |
Elkassas, Dina W., Elhoshy, Ahmad Z., Abdalla, Ali I. |
| Předmět: |
|
| Zdroj: |
International Journal of Clinical Dentistry; 2011, Vol. 4 Issue 1, p11-20, 10p, 3 Black and White Photographs, 2 Charts |
| Abstrakt: |
Purpose: This study evaluated the effect of caries removal using carbide and ceramic burs on the microtensile bond strength and ultramorphology of the resin-dentin interface of both etch and rinse and self etch adhesive systems. Methods: Twenty extracted human molars with coronal dentin caries were used in this study. The occlusal enamel was removed, exposing a flat surface of dentin with carious lesion surrounded by sound dentin. In half of the teeth, the carious lesions were excavated with round tungsten carbide bur. In the other half caries was removed using round ceramic bur. For each group, two adhesives were used; Prime and Bond-NT (PBNT) and Xeno V (XV). A core of resin composite (Quixx, Dentsply) was build up to form a crown segment. Bonded teeth were sectioned to obtain sticks for microtensile testing. Testing was conducted using a universal testing machine at a crosshead speed of 1mm/min. Microtensile bond strengths means and SDs were calculated and data was statistically-analyzed using two-way ANOVA. Representative specimens were examined using SEM to assess the ultra-morphological characterization of the resin-dentin interface. Results: There was no statistically significant difference between both PBNT (18.97±3.865 Mpa) and XV (20.76±8.329 Mpa) when carious dentin was removed using tungsten carbide bur, while with the ceramic bur the XV(25.3±5.423 Mpa)) showed statistically significant higher bond strength compared to PBNT(14.48±5.857 Mpa)). SEM results revealed difference in the hybrid layer thickness and resin impregnation in both adhesives systems using the two methods of caries removal. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
