접착제의 다층적용이 복합레진의 전단결합강도에 미치는 영향

Abstract

The objective of this study was to evaluate the influence of multiple adhesive coatings on the thickness of hybrid and adhesive layer and shear bond strength (SBS) of self-etch adhesives and self-etch primer adhesives. The buccal or lingual crown dentin of extracted human molars was used. Two self-etch adhesives-AdporTM PromptTM L-PopTM (3M ESPE, Germany) and Xenoⓡ III (Dentsply, Germany), three self-etching primer adhesives- AdheSEⓡ (Ivoclar Vivadent, Liechtenstein), Unifilⓡ Bond (GC Corporation, Tokyo, Japan), and ClearfillTM SE Bond (Kuraray Medical Inc., Japan), a total etch system as control group-Scotchbond Multipurpose PlusTM (3M ESPE, Germany) were applied to 600-grit abraded dentin. Self-etch adhesives or self-etch primer adhesives were applied 1, 2, and 3 times on the dentin before light curing. In another group adhesives were re-applied after light curing first layer. Treated surfaces were prepared to measure the thickness of hybrid and adhesive layer with SEM, and shear bond strength to dentin using an Instron machine. The following results were obtained; 1. The adhesive layers increased with the number of coatings(p<0.05) with all adhesives. Adpor Prompt L-Pop and Xeno III were significantly thinner then self-etch primer adhesives (p<0.05). 2. The thickness of hybrid layers increased with the number of coatings (p<0.05) as 1.07㎛, 1.51㎛, and 2.05㎛ in Adpor Prompt L-Pop, 0.45㎛, 1.10㎛, and 1.32㎛ in Xeno III, but there was no change in self-etch primer adhesives. 3. The shear bonding strength of Unifil Bond and Clearfill SE Bond were higher than Scotchbond Multipurpose Plus and Adpor Prompt L-Pop(p<0.05), and similar with Xeno III. 4. The shear bond strength increased significantly with the number of coatings in Adpor Prompt L-Pop(p<0.05), increased no significantly in Xeno III and UniFil Bond and there was no change in Clearfill SE Bond, but decreased at 3times in AdheSE Bond. 5. In Adpor Prompt L-Pop and Xeno III, the shear bond strength decreased when adhesives were re-applied after curing the first adhesive layer.