Objectives: The purpose of the present study was to examine the efficacy of high purity glyceryl mono-methacrylate as a dentin primer. Methods: The experimental dentin primers were prepared by diluting one of 90.0%(GM), 96.0%(P-GM96) or 99.9%(P-GM99) purity guaranteed glyceryl mono-methacrylate in the distilled water at the concentration of 35vol%. The efficacy of experimental dentin primers were evaluated by measuring the polymerization contraction gap width of the resin composite (Silux Plus; 3M, USA) restored in a cylindrical dentin cavity and by measuring tensile bond strength to the flat dentin surface. The dentin substrates in the extracted human molar was conditioned with 0.5 mol/L EDTA for 60 sec. The dentin was then primed with one of three experimental dentin primers for 60 sec and the cavity was dried completely. The commercial dentin bonding agent (Clearfil Photo Bond; Kuraray, Japan) was applied in the cavity and irradiated for 10 sec followed by Silux Plus filling. The tensile bond strength of the dentin adhesives was measured 24h after polymerization of composite(Cross-head speed; 0.5mm/min). For the control group, the resin composite was filled into the cavity without the dentin priming. The results were analyzed statistically with Student's t-test(p<0.05). Results: The contraction gap formation was completely prevented in all of the specimens regardless of purity of GM. The tensile bond strength was not significantly affected by the purity of the GM. Conclusions: It was possible to conclude that the clinical use of the high purity glyceryl mono-methacrylate was desirable to avoid the side effect by the impurities.

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