IADR Abstract Archives
Ten Zirconia Strengths and Translucencies With Respect to Puck Height
Objectives: To examine how strength and translucency changes as a function of puck height using contrast ratio and biaxial strength
Methods: Ten cylinders with a post-fire 14.0 mm diameter (expanded for the shrinkage) from each of ten multi-layered zirconia materials: Priti Multi Translucency Plus, Zolid Bion, UpCERA Explore, Luxor Z True Nature, Nacera Pearl Natural, Priti Multi Translucent, Copra Supreme Hyperion, DDcube ONE, IPS e.max ZirCAD Prime, and ZirCAD Prime Esthetic. Multi were milled using PrograMill PM7 milling unit. Pre-fired cylinders were cut in a Buehler IsoMet 1000 saw to produce the top five layers of 1.6 mm thick specimens to produce 1.0 ± 0.1 mm fired specimens. The un-sintered discs were polished through 1200 grit SiC. Each material sintered at the same time according to their manufacturer's schedule in the manufacturer’s recommended furnace.
Ten specimens from each material/layer were analyzed for color and translucency. CIE L*a*b* and Yxy values were measured against white (WB) and black backgrounds (BB) with glycerin against the background (UltraScan VIS spectrophotometer). Five measurements were made per specimen. Using the Y value from the black background and the white background the CR (contrast ratio) was calculated by:
CR = Yblack/Ywhite
The disc specimens were loaded in a piston-on-three ball testing fixture detailed in ISO 6872. The specimens were loaded at a loading rate of 1.0 mm/minute.
The biaxial flexure strength values were calculated by:
σ = -0.2387 P(X-Y)/b2
where σ is maximum strength (MPa); P is fracture load (N), X and Y are loading constants derived from loading configuration and Poison’s ratio and b is thickness of specimen.
Results: The means and standard deviations at each thickness/direction for the Translucency parameter and contrast ratios for Ceramic Crown (Table 1) and OnX Tough 2 (Table 2) were analyzed with ANOVA (α≤0.05) and are presented for each material below:
Conclusions: Within the bounds of this study, IPS e.max ZirCAD Prime, IPS e.max ZirCAD Prime Esthetic, Priti Multi Translucent, Priti Multi Translucent Plus, and Copra Supreme Hyperion had statistical significant increases for both contrast ratio and strength as a function of height within the zirconia puck. The other materials did not show a change in strength or translucency.
Methods: Ten cylinders with a post-fire 14.0 mm diameter (expanded for the shrinkage) from each of ten multi-layered zirconia materials: Priti Multi Translucency Plus, Zolid Bion, UpCERA Explore, Luxor Z True Nature, Nacera Pearl Natural, Priti Multi Translucent, Copra Supreme Hyperion, DDcube ONE, IPS e.max ZirCAD Prime, and ZirCAD Prime Esthetic. Multi were milled using PrograMill PM7 milling unit. Pre-fired cylinders were cut in a Buehler IsoMet 1000 saw to produce the top five layers of 1.6 mm thick specimens to produce 1.0 ± 0.1 mm fired specimens. The un-sintered discs were polished through 1200 grit SiC. Each material sintered at the same time according to their manufacturer's schedule in the manufacturer’s recommended furnace.
Ten specimens from each material/layer were analyzed for color and translucency. CIE L*a*b* and Yxy values were measured against white (WB) and black backgrounds (BB) with glycerin against the background (UltraScan VIS spectrophotometer). Five measurements were made per specimen. Using the Y value from the black background and the white background the CR (contrast ratio) was calculated by:
CR = Yblack/Ywhite
The disc specimens were loaded in a piston-on-three ball testing fixture detailed in ISO 6872. The specimens were loaded at a loading rate of 1.0 mm/minute.
The biaxial flexure strength values were calculated by:
σ = -0.2387 P(X-Y)/b2
where σ is maximum strength (MPa); P is fracture load (N), X and Y are loading constants derived from loading configuration and Poison’s ratio and b is thickness of specimen.
Results: The means and standard deviations at each thickness/direction for the Translucency parameter and contrast ratios for Ceramic Crown (Table 1) and OnX Tough 2 (Table 2) were analyzed with ANOVA (α≤0.05) and are presented for each material below:
Conclusions: Within the bounds of this study, IPS e.max ZirCAD Prime, IPS e.max ZirCAD Prime Esthetic, Priti Multi Translucent, Priti Multi Translucent Plus, and Copra Supreme Hyperion had statistical significant increases for both contrast ratio and strength as a function of height within the zirconia puck. The other materials did not show a change in strength or translucency.
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