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KMID : 0352119970130030279
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Journal of Kyung Hee University
1997 Volume.13 No. 3 p.279 ~ p.288
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A STUDY OF ADHESION OF RESTORATIVE RESIN TO TOOTH DENTIN
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Abstract
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The purpose of this study was to evalutate the effects of dentin adhesives of the tensile bond strengths to bovine dentin surfaces.
One hundred and twenty lower anterior bovine teeth stored at freezer under -30℃ before experiments were used in this study.
The teeth embeded in chemically cured resin before experiment were ground horizontally to reveal the dentin, and grounded(polished) with wet #180~600 silicone carbide papers.
Two commercially available dentin adhesives(Clearfil Liner Bond Ⅱ; LB Group, and Scotchbond multipurpose; SM Group) were included in this study(Table 1).
Bonding of a light cured composite(Z-100, 3M) to prepared bovine dentins using two dentin adhesives was investigatd utilizing a tensile test with Intesco Universal testing machine(Intesco IM-20, Japan). A crosshead speed of 0.3㎜/min at a full scale loads of 20㎏ was used.
To identify unltrastructure features of the interfacial surfaces between dentin adhesives and bovine dentin resulting from de-bond after measring the tensile bond strengths, microscopic investigatin were also perfomed under scanning electron microscope(SEM, JEOL-JSM 820, Japan).
Statistical differences forthe tested parameters were calculated using Students T-test(Table 2).
The results were as follows;
1) The tensile bond strength of the composite resin(Z-100) to dentin were higher when the bovine dentin surface treated with Clearfil Liner Bond Ⅱ(111.87±26.62㎏/㎝^(2)) than Scotch bond Multipurpose(71.26±16.74㎏/㎝^(2)).
2) A number of resin tags were observed and no gap was seen at the resin-dentin interface in two group.
3) A thick hybrid layer and lateral branchesof resin tags could be seen in SM group.
The results indicated that the relation between tensile strengths of the dentin adhesives to bovine dentin and resin tags fromed into the dentin could not affected.
The main reason of decreasing the tensile bond strength to bovine dentin in group SM compared with in group LB seemed to be a difference of the penetration effect of the primers into the dentin treated with the two dentin adhesives.
For the permenence of the adhsiveness, the development of the agents for treating the dentin collagen and more complete permeable effect of the resin primer into the decalcified dentin should be needed.
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