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광중합 복합레진의 색안정성 및 투명도변화에 관한 가속시험
황인남,오원만,류선열 전남대학교 치과대학 1992 전남치대논문집 Vol.4 No.1
Color stability of tooth colored restorative resins is an important factor, particularly in anterior teeth restoration. The purpose of this study was to evaluate the color stability and opacity change of several light curing composite resins. Specimens of eight composite resins(Prisma AP.H, Brilliant Enamel, Charisma, Durafil, Helio Progress, Herculite XR, P-50 and Silux Plus) were divided into two groups : In Group 1, the specimens were polymerized by visible light curing unit for 60 seconds on both sides and in Group 2, the post-cured specimens were heat tempered by light/heat curing unit for 45 units(about 18 min.). All specimens were stored in distilled water at 60℃ for 30 days. The color characteristics(L^*, a^*, b^*) and opacity of the specimens before and after immersion were measured by spectrocolorimetry and the total color difference(ΔE^*) and opacity change(ΔY%) were computed. The results obtained were as follows: 1. SP and APH in both groups, DF, HP and HXR in Group Ⅰ showed ΔE^*-value above 2.0. 2. DF, HP, SP and HXR in Group Ⅰ showed higher ΔE^*-value than in Group 2, but the others had no significant difference. 3. The opacity of CH and HXR in Group Ⅰ, and of CH and BE in Group 2 decreased after immersion, while that of the others increased. 4. Opacity change of BE, P50 and HXR was significantly different between Group Ⅰ and 2. These results suggest that color change in the post-cure heat tempered specimens by light/heat curing unit was smaller than that of the specimens polymerized by visible light curing unit. No clinically detectable opacity changes were noted for any materials in either group.
광중합 복합레진의 색안정성 및 투명도 변화에 관한 가속시험
황인남,오원만 大韓齒科保存學會 1993 Restorative Dentistry & Endodontics Vol.18 No.1
AbstractColor stability of tooth colored restorative resins is an important factor, particularly in anterior teeth restoration.The purpose of this study was to evaluate the color stability and opacity change of several light curing composite resins. Specimens of eight composite resins(Prisma AP. H., Brilliant Enamel, Charisma, Durafil, Helio Progress, Herculite XR, P-50 and Silux Plus) were divided into two groups '?In Group 1, the specimens were polymerized by visible light curing unit for 60 seconds on both sides and in Group 2, the post-cured specimens were heat tempered by light/heat curing unit for 45 units(about 18 min.). All specimens were stored in distilled water at 60? for 30 days.The color characteristics(L*, a*, b*) and opacity of the specimens before and after immersion were measured by spectrocolorimetry and the total color difference (AE*) and opacity change (AY%) were computed.The results obtained were as follows : 1. SP and APH in both groups, DF, HP and HXR in Group 1 showed AE*-value above 2.0. 2. DF, HP, SP and HXR in Group 1 showed higher AE*-value than in Group 2, but the others had no significant difference. 3. The opacity of CH and HXR in Group 1, and of CH and BE in Group 2 decreased after immersion, while that of the others increased. 4. Opacity change of BE, P50 and HXR was significantly different between Group 1 and 2. These results suggest that color change in the post-cure heat tempered specimens by li- ght/heat curing unit was smaller than that of the specimens polymerized by visible light curing unit. No clinically detectable opacity changes were noted for any materials in either goup.
발거된 자연치와 5종 Shade Guide의 색채 계측기를 이용한 색상 비교
황인남,오원만 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2
The tristimulus values of 180 extracted maxillary and mandibular anterior teeth were measured by colorimeter. And it were colnverted to Munsell color order system(Hue, Value, Chroma) and CIE L^*a^*b^* color coordinates. The commonly used Vita, and Bioform shade guides, 2 composite resin shade guides(Prisma APH and Z-100), and a glass-ionomer shade guide(Fuji II) were compared with these teeth. At the middle facial surface, color distributions of teeth were Hue(0.56YR to 9.77Y), Value(2.46 to 7.9), and Chroma(0.14 to 2.20), And the aberaged values and standard deviations for L^*a^*b^* were 63.18±10.44, 1.11±1.66, and 5.79±2.36. The shade guide did not match well with the color space of the human teeth. Especially, the lacks of the Yellow-red Hues and higher values were prominent. Compare with other measurements, the Hues of the teeth measured in this study were broadly distributed(most of ranges in Y and YR were included), while the Value and chroma were shown to the lower.
황인남(In-Nam Hwang),장지현(Ji-Hyun Jang) 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.7
The demand for tooth-colored restorations has grown considerably during the last decade. Posterior composite restorations have risen in popularity as a result of the development of improved resin composites, bonding systems and operating techniques. A major limitation of direct composite restoration is the difficulty of controlling the polymerization shrinkage. To overcome this limitation, the indirect fabrication of a composite restoration and cementation with resin cement has been advocated. Unfortunately, the current available resin cements with indirect restorations do not always bond to dentin as strongly as dentin adhesive systems bond with direct resin composite restorations. Several procedural strategies have been proposed for indirect composite restoration. In this regard, the rationale for the indication, characteristics and clinical application is described in this paper. As a result, we will try to suggest the evidence-based guidelines for indirect composite restorations by reviewing each available indirect composite products, technical procedure and pronosis.