지르코니아 두께에 따른 광중합 레진 시멘트의 FT-IR을 이용한 중합도 비교

Abstract

The purpose of this study is to compare the degrees of conversion of light curing resin cement specimens cured by the light transmitted different thickness of zirconia specimens using Fourier Transform Infrared Resonance Spectroscopy. Zirconia specimens were milled with a diameter of 15mm, thickness of 0.5, 1.0, 1.5, and 2.0mm using Prettau zircon(Zirkonzhan, Italy) and Zirkonzhan CAD/CAM system. Five light curing resin cement films(RelyX™ veneer cement, 3M ESPE, USA) were fabricated for each groups and cured by LED curing light (Elipar™S10, 3M ESPE, Germany) for 20s under the zirconia specimens with different thickness. The cured resin cement disk was removed from a cover glass and grinded to make KBr pellet specimen. The quantity of carbon double bond, before and after light curing, were measured with FT-IR(Fourier Transform Infrared Resonance Spectrometer, Nicolet 6700, Thermo Electron Corporation, USA) and the degrees of conversion were calculated. The statistic analysis was performed with Kruskal-Wallis test. The average degrees of conversion were (1) Group 1: 35.61% (2) Group 2: 30.76% (3) Group 3: 28.51% (4) Group 4: 30.48% and (5) Total: 31.34%. There was no significant difference between groups(p>0.05). According to this study, there was no significantly difference in degree of conversion depending on the thickness of zirconia, and the conversion of light curing resin cement was not enough for setting the zirconia prosthesis. Further evaluation using dual cure resin cement is expected to be necessary.