122 J Meikai Dent Med 37 2, 122 128, 2008 5 2 L* a* b* E*ab Effect of Transparency of Experimental Cements on the Color of Indirect Resin Composite after Thermal Cycling Yoshiaki HASEGAWA, Yoko TAKAHASHI, Yasushi HIBINO, Yuko NAGASAWA, Jun OMATSU, Taniichiro YAMAGA, Satoru AWATA, Isokatsu SHIMANO and Hiroshi NAKAJIMA Division of Dental Biomaterials Science, Department of Restorative & Biomaterials Sciences, Meikai University School of Dentistry Abstract : This study examined the effect of transparency of experimental cements on the color of indirect resin composite after thermal cycling. Experimental UDMA-based resin cements with five different transparencies were fabricated by adding 0.05, 0.1, 0.15 and 0.2 mass TiO2 powder. Experimental cement without TiO2 powder 0was also prepared. Disk specimens 10 mm diameter and 1 mm thick were prepared from bilayered indirect resin composite CERAMAGE, Shofu, CM-59 incisal color, 0.8 mm thick and CM-A 3 B body color, 0.2 mm thick Disk-shaped abutment 10 mm diameter and 2 mm thick was made from resin abutment material Die Color Checker, Shofu, DC-1A layer of the set cement 100 µm thick was placed between the indirect resin composite and the abutment discs. Both the color differences E*ab, n 5 between the specimens with and without the cement layer and the TP value of disc specimens were determined using a spectrocolorimeter PR 650 Photo Research before control and after thermal cycling 555, 1,000, 5,000, 10,000 cyclesthe results were statistically compared using ANOVA/Scheffè s test. L* value of the specimen after thermal cycling was significantly decrease than the specimen before thermal cycling p 0.05 a* value of the specimen after thermal cycling was significantly increase than before thermal cycling p 0.05There were no significant differences in b* and E*ab values among all the specimens p 0.05Adding more 0.1 mass TiO2 powder in experimental cement was effect of constraining to change in color of indirect resin composite after thermal cycling. Key words : color difference, transparency, dental composite, TiO2 powder, thermal cycling
123 1, 2 ph 3 4 5 6, 7 8 9, 10 11, 12 2 13 14, 15 1 UDMA 5 0, 0.05, 0.10, 0.15, 0.20 mass CM-59 CM-A 3 B 2 DC-1 Table 1 Table 1 Materials used inthis study. Materials Manufacturer Lot No Resin cement Experimental cement Shofu EPR 7 TiO2 powder mass 0, 0.05, 0.10, 0.15, 0.20 Indirect resin composite Ceramage Shofu 120311 120307 Color CM-59 Incisal color CM-A 3 B Body color Abutment materials Die Color Checker Shofu 070416 Color DC-1 Light-curing modeling Liquid Modeling Liquid Shofu 110606 Silane coupling system Impava Porcelain Primer 350-0283 1-1 Shofu 060528
124 37, 2008 2 1 Translucency Parameter TP 1 10 mm 1.0 mm 0.3 mm 3 SiC 600 0.2 mm 10 mm 1.0 mm 3 SiC 600, 800, 1000, 1200 γ - Micro polish, BUEHLER, Lake Bluff, IL, USA 1.0 µm, 0.3 µm, 0.05 µm 1.0 0.05 mm Fig 1 Height 1.0mm Fig 1 Width 10mm Width 25mm Polished with alumina Polished with #600 SiC sanding paper Bilayerd indirect resin composite. Coating with polyurethane resin Height 20mm Butyl tape Incisal color (0.8mm) Body color (0.2mm) Bilayerd indirect resin composite Width 10mm Width 25mm Fig 2 Schematic diagram of thermal cycling mold. The mold was made with epoxy based resin Epofix Resin. Struers Fig 2 K 178 16, 1755 60 30 5 60 30 3 1 1000 TC 1000 5000 TC 5000 10000 TC 10000 5 2 TP TP 1, 18L* 22.6, a*0.2, b* 1.6L* 100.3, a*1.3, b* 1.2 D 55, 20 45 4nm 20 nm 19 PR 650, SpectraScan! Colorimeter, Photo Research, Chatswroth, CA, USA L*, a*, b* L*, a*, b* L*a*, b* a* b* TP TP! L 2 a 2 b 2 " 1/2 L Lb Lw, a ab aw, b bb bw b w ANOVA / Scheffè 5 2 1 10 mm 2.0 mm 3 SiC 600 0.5 mm 500 mw/cm 2 30
125 DC-1 Bilayerd indirect resin composite (1.0mm) Cement layer (0.1mm) Abutment (2.0mm) White plate Fig 3 Schematic diagram of test specimen for E*ab measurement. TP value 30.0 25.0 20.0 15.0 10.0 * * Thermal cycling 5.0 SiC 600 2.1 mm 2.0 mm 2 a 1 0.02 g TP 1 JIS Z 8722 20JIS Z 8729 21 L*, a*, b* 1 3 5 Fig 3 b L*, a*, b* E*ab 1, 18 21 E*ab! L* 2 a* 2 b* 2 " 1/2 L* L*n L*c, a* a*n a*c, b* b*n b*c n c ANOVA/Scheffè 5 1 TP TP Fig 4 TC 5000 TP p 0.05 E*ab 0.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 TC1000 TC5000 TC10000 Thermal cycling Fig 4 TP value of the specimens after thermal cycling. *Significant difference p 0.05 * * TC1000 TC5000 TC10000 0 0.05 0.1 0.15 0.2 TiO 2 powder content (mass%) Fig 5 E*ab values of specimen after thermal cycling. *Significant difference p 0.05 2 E*ab Fig 5 L*, a*, b* Table 2 1 L* 0, 0.15, 0.2 mass p 0.05 0.05 mass p 0.05 0.1 masstc 1,000 TC 10,000 p 0.05 2 a* 0mass 0.05 mass
126 37, 2008 Table 2 L*, a*, b* values of specimens after thermal cycling. TiO2 powder content mass 0 0.05 0.1 0.15 0.2 Thermal cycling Mean SD Mean SD Mean SD Mean SD Mean SD L* TC 1000 TC 5000 TC 10000 0.0 0.3 0.7 0.3 0.6 0.2 1.0 0.4 0.1 0.3 0.9 0.9 0.2 0.4 0.2 0.3 0.5 0.3 0.7 0.5 0.0 0.5 0.5 0.2 0.7 0.2 0.7 0.5 0.0 0.3 0.4 0.3 0.9 0.3 0.6 0.5 0.1 0.2 0.5 0.4 a* TC 1000 TC 5000 TC 10000 0.1 0.2 0.2 0.0 0.1 0.0 0.3 0.1 0.2 0.2 0.1 0.0 0.2 0.2 0.6 0.2 0.7 0.2 0.8 0.1 b* TC 1000 TC 5000 TC 10000 0.0 0.3 0.6 0.1 0.4 0.1 0.6 0.2 0.3 0.2 0.7 0.5 0.3 0.2 0.7 0.4 0.7 0.3 0.5 0.7 0.3 0.1 0.5 0.5 0.8 0.3 0.6 0.4 0.5 0.2 0.6 0.4 1.0 0.2 0.8 0.5 0.7 0.1 0.9 0.3 p 0.05 0.1 mass p 0.05 3 b* 0mass p 0.05 0.05 mass p 0.05 4 E*ab 0massTC 10,000 p 0.05 0.05 masstc 1,000 p 0.05 0.1 mass p 0.05 22 ph 23 1 16, 17, 24 5 55 1 10000 10 1 10 3 16 4 5, 24 TP TC 5000 TP TP 4, 5, 24
127 10, 25, 26 L*, a*, b*, E*ab L* L* L* a* 0.1 mass 1mm 27, 28 TP a* 0.1 mass 0.1 mass b* b* E*ab E* ab TP 0.1 mass 1
128 37, 2008 TP 2 0.1 mass L*, a* b*, E*ab 0.1 mass 26, 375 381, 2007 42, 326 333, 1998 29, 504, 1986 5, 129 133, 1987 Lee YK, Lu H and Powers JM : Optical properties of four esthetic restorative materials after accelerated aging. Am J Dent 19, 155 158, 2006 Loeys K, Lambrechts P, Vanherle G and Davidson CL : Material development and clinical performance of composite resins. J Prosthet Dent 48, 664 672, 1982 1 26, 26 32, 2005 Paravia RD, Westland S, Imai FH, Kimura M and Powers JM : Evaluation of blending effect of composites related to restoration size. Dent Mater 22, 299 307, 2006 24, 15 22, 2005 18 Special Issue 34, 186, 1999 Arikawa H, Fujii K, Kanie T and Inoue K : Light transmittance characteristics of light-cured composite resins. Dent Mater 14, 405 411, 1998 Miyagawa Y, Powers JM and O Brien WJ : Optical properties of direct restorative materials. J Dent Res 60, 890 894, 1981 11 4 The Quintessence 25, 89 103, 2006 40, 843 852, 1996 Hata U, Kawauchi D, Yamamura O and Fujiwara S : Chromatic study of all-ceramic restorations influence of the color of the abutment tooth and cement on the color tone of copings 32, 13 20, 2006 5, 187 195, 1986 5, 644 652, 1986 Paravina RD, Kimura M and Powers JM : Evaluation of polymerization-dependent changes in color and translucency of resin composites using two formulae. Odontology 93, 46 51, 2005 40, 336 351, 1997 JIS Z8722 2000 JIS Z8729 1994 24, 117 120, 2003 1 12, 29 33, 1993 2 SEM 13, 116 121, 1994 9, 53 64, 1990 11, 647 655, 1992 TM 46, 332 342, 2003 Powers JM, Dennison JB and Lepeak PJ : Parameters that affect the color of direct restorative resins. J Dent Res 57, 876 880, 1978 2008 5 31 2008 6 19