Opaque shade 복합레진의 opacity와 배경 색상 차단 능력의 평가박수정황윤찬오원만황인남*전남대학교 치의학전문대학원 보존학교실, 치의학 연구소, 2단계 BK21 사업단OPACITY AND MASKING EFFECT OF THE OPAQUE SHADE COMPOSITE RESINSSu Jung Park, Yun-Chan Hwang, Wonmann Oh, In-Nam Hwang*Dept. of Conservative Dentistry, School of Dentistry, DSRI, 2nd stage of BK21, Chonnam National UniversityThe purpose of this study was to assess the background color-in terceptive ability and opacity ofopaque shade composites (Universal composite, Filtek Z350, Char Estelite, Esthet-X, and Metafil Flo). Twenty four background specimens (diameter 5.5 ㎜, thickness 3.0 ㎜) with Root dentin Mustard(Bisco, Schaumburg, IL, USA) were made. The CIE L*a*b* value of background specimens was mea-sured by a spectrophotometer (Spectrolino, GretagMacbeth, Regen mens in every group were filled on the background specimens. Th e surface color of samples was mea-sured by a spectrophotometer in 3.0 ㎜ and every thickness to 0.5 ㎜ while grinding. The color differ-ence in the background color al