[PPS-P-2] Title : Effects of ultraviolet weathering aging on the color stability and biocompatibility of various computer-aided design and computer-aided manufacturing glass–ceramic materials
Sub Title : Effects of aging on the color stability and biocompatibility of various CAD/CAM glass–ceramics
[Abstract]
[Objective]
This study assessed the changes in color stability and biocompatibility of computer-aided design and computer-aided manufacturing (CAD-CAM) glass–ceramics after ultraviolet weathering (UW) aging.
[Method]
A total of 300 plate-shaped specimens (12.0×14.0×1.5mm3) were prepared using a leucite-reinforced glass–ceramic (IPS Empress CAD; E), a lithium disilicate (IPS e.max CAD; M), and two zirconia-reinforced lithium silicate (Celtra Duo; C, Vita Suprinity; V) glass–ceramics. Specimens were divided into three groups (n = 25, each), subjected to water storage at 37oC for 24h (control group), or UW aging at 150kJ/m2 (first-aged group) or 300kJ/m2 (second-aged group).1) The color stability, mechanical and surface properties, and biocompatibility of the CAD-CAM glass-ceramics were investigated experimentally, followed by statistical analysis.2-4)
[Results and Discussion]
The brightness and redness or greenness were reduced in all groups after aging. After the first aging, V exhibited the largest color change and E exhibited the smallest color change. After the second aging, E exhibited the highest nanoindentation hardness and Young’s modulus. The surface roughness was the highest for V after the first aging. Furthermore, the hydrophilicity of the materials increased after aging process. The cell proliferation/viability of human gingival fibroblasts was the highest in E before and after aging. Almost all cells survived for all groups based on a live/dead assay. Leucite-reinforced glass–ceramic exhibit the highest color stability and biocompatibility after aging. The color stability and biocompatibility of CAD-CAM glass–ceramics depend on the aging process and material type.
[References]
1) Lee SM, Choi YS. Effect of ceramic material and resin cement systems on the color stability of laminate veneers after accelerated aging. J Prosthet Dent 2018;120:99–106.
2) Arocha MA, Basilio J, Llopis J, et al. Colour stainability of indirect CAD-CAM processed composites vs. conventionally laboratory processed composites after immersion in staining solutions. J Dent 2014;42:831–38.
3) Kim SH, Choi YS, Kang KH, et al. Effects of thermal and mechanical cycling on the mechanical strength and surface properties of dental CAD-CAM restorative materials. J Prosthet Dent 2022;128:79–88.
4) Sun T, Liu R, Liu X, et al. The biocompatibility of dental graded nano-glass-zirconia material after aging. Nanoscale Res Lett 2018;13:61.
[Objective]
This study assessed the changes in color stability and biocompatibility of computer-aided design and computer-aided manufacturing (CAD-CAM) glass–ceramics after ultraviolet weathering (UW) aging.
[Method]
A total of 300 plate-shaped specimens (12.0×14.0×1.5mm3) were prepared using a leucite-reinforced glass–ceramic (IPS Empress CAD; E), a lithium disilicate (IPS e.max CAD; M), and two zirconia-reinforced lithium silicate (Celtra Duo; C, Vita Suprinity; V) glass–ceramics. Specimens were divided into three groups (n = 25, each), subjected to water storage at 37oC for 24h (control group), or UW aging at 150kJ/m2 (first-aged group) or 300kJ/m2 (second-aged group).1) The color stability, mechanical and surface properties, and biocompatibility of the CAD-CAM glass-ceramics were investigated experimentally, followed by statistical analysis.2-4)
[Results and Discussion]
The brightness and redness or greenness were reduced in all groups after aging. After the first aging, V exhibited the largest color change and E exhibited the smallest color change. After the second aging, E exhibited the highest nanoindentation hardness and Young’s modulus. The surface roughness was the highest for V after the first aging. Furthermore, the hydrophilicity of the materials increased after aging process. The cell proliferation/viability of human gingival fibroblasts was the highest in E before and after aging. Almost all cells survived for all groups based on a live/dead assay. Leucite-reinforced glass–ceramic exhibit the highest color stability and biocompatibility after aging. The color stability and biocompatibility of CAD-CAM glass–ceramics depend on the aging process and material type.
[References]
1) Lee SM, Choi YS. Effect of ceramic material and resin cement systems on the color stability of laminate veneers after accelerated aging. J Prosthet Dent 2018;120:99–106.
2) Arocha MA, Basilio J, Llopis J, et al. Colour stainability of indirect CAD-CAM processed composites vs. conventionally laboratory processed composites after immersion in staining solutions. J Dent 2014;42:831–38.
3) Kim SH, Choi YS, Kang KH, et al. Effects of thermal and mechanical cycling on the mechanical strength and surface properties of dental CAD-CAM restorative materials. J Prosthet Dent 2022;128:79–88.
4) Sun T, Liu R, Liu X, et al. The biocompatibility of dental graded nano-glass-zirconia material after aging. Nanoscale Res Lett 2018;13:61.