| 1155 Marginal adaptation of five flowable resin composites in the dentin cavity | ||
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Y. UTSUMI, T. HASEGAWA, K. ITOH, and H. HISAMITSU, Showa University, Tokyo, Japan Objectives: Marginal adaptation of five flowable composites was evaluated by measuring wall-to-wall contraction gap in a cylindrical dentin cavity. Methods: Five combinations of the conventional and flowable resin composites (Claerfil-APX [C] and Clearfil-ST [Cf], Estelite [E] and Estelite-LV [Ef], Filtek-A110 [F] and Filtek-Flow [Ff], Metafil-C [M] and Metafil-Fro [Mf], Unifil-S [U] and Unifil-Flow [Uf]) were employed. The cylindrical dentin cavities (3 mm x 1.5 mm) prepared in extracted human molars were restored with one of the composites after pretreatment according to the manufacturers' instructions. For the positive control, the cavity was conditioned with EDTA and primed with 35% glyceryl mono-methacrylate (GM); Clearfil Photo Bond was applied prior to the composite filling. Ten minutes after polymerization of composite, the gap width was measured under a light microscope and presented in percent to the cavity diameter. Ten specimens for each material, 200 in total, were examined. Results: In the positive control groups, the marginal adaptation was completed with one exceptional specimen of Unifil-S. With the commercial bonding systems, the gap was observed between two and eight specimens out of 10. The mean gap values (the number of gap-free specimens) were 0.018(8) [C]; 0.019(8) [Cf]; 0.027(5) [E]; 0.060(4) [Ef]; 0.115(2) [F]; 0.014(8) [Ff]; 0.011(7) [M]; 0.101(5) [Mf]; 0.083(4) [U]; 0.019(7) [Uf]. Mann-Whitney's U-test revealed that the difference was significant between [F] and [Ff] (p<0.05). Conclusions: Five flowable resin composites exhibited comparable marginal adaptation compared to the conventional high-viscous composite though complete marginal integrity could not be obtained when the cavity was pretreated with commercial dentin bonding systems. It was concluded that a flowable resin composite is clinically useful in combination with an experimental highly effective dentin bonding system composed of EDTA, GM and Cleafil Photo Bond. | ||
| Seq #116 - General Properties Related to Adhesive Materials 3:45 PM-5:00 PM, Thursday, 7 March 2002 San Diego Convention Center Exhibit Hall C | ||
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