Biomedical Engineering Reference
In-Depth Information
These results suggest that the acid etching of lased dentin can reinforce the hybrid layer and
formation of resin tags, but the acidic monomer of SE bonds cannot function at its best due
to the obstruction of dentinal tubules and denatured collagen fibrils network and the
absence of smear layer. These results were not the same as expected. A self etching adhesive
system and two steps adhesive system showed a similar SBS because the resin tags only
contribute to the bond strength in small portions (15%) and the poorer quality of the hybrid
layer appears to be the main reason for the lower bond strength.
5. Conclusion
An Er,Cr:YSGG laser was used to determine if the laser can increase the shear bond strength
between the composite resin and surface treated dentine surfaces. On the other hand, the
pretreatment of dentin with an Er,Cr:YSGG laser does not affect the shear bond strength of
the two different adhesive systems under these experimental conditions. In addition, the
shear bond strength of two different adhesive systems in dentin treated with a 1.4W laser
intensity was higher than that treated with 2.25W but the difference was not significant.
6. Acknowledgment
This study was supported in part by a grant from Kyung Hee University in 2006 (KHU-
20060930) and by the Basic Science Research Program through the National Research
Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology
(NRF-20100023448).
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