| Autor: |
Takahashi, Akiko, Inoue, Satoshi, Kawamoto, Chiharu, Ominato, Rika, Tanaka, Toru, Sato, Yasuyo, Pereira, Patricia N. R., Sano, Hidehiko |
| Předmět: |
|
| Zdroj: |
Journal of Adhesive Dentistry; 2002, Vol. 4 Issue 2, p151-159, 9p, 11 Black and White Photographs, 4 Charts |
| Abstrakt: |
Purpose: The objective of this work was to evaluate the in vivo long-term durability of bond strength and morphological appearance of interfaces between dentin and two adhesive systems. Materials and Methods: Class V cavities were prepared on the facial surfaces of 6 intact teeth of a monkey, and restored with Unifil Bond/Unifil F and Fuji Bond LC/Clearfil AP-X. One year later, 10 other teeth were restored with the same materials and the monkey was sacrificed after 24 hours. For in vitro examination, 6 more teeth were extracted from the monkey, restored in a similar manner with the two materials, and stored in 37°C water for 1 day. All specimens were subjected to the microtensile bond strength (μTBS) test. The debonded surfaces of specimens were morphologically observed with the FE-SEM. Results: There were no statistically significant differences among the mean μTBS obtained for Unifil Bond/Unifil F under the three conditions (1 day and 1 year in vivo, and 1 day in vitro), and most specimens showed cohesive failure within resin composite (Unifil F). However, FE-SEM observations showed that resinous material within the hybrid layer made by Unifil Bond seemed to increase in porosity after 1 year. For Fuji Bond LC/Clearfil AP-X, μTBS at 1 day in vitro was significantly higher than that at 1 year in vivo, and bond strengths in vivo tended to decrease over time, although a statistically significant difference was not observed. From FE-SEM observations, most specimens showed cohesive failure within the adhesive (Fuji Bond LC). Conclusion: Bond strengths of the two adhesive systems tended to decrease for 1 year in vivo. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
