To evaluate the effect of different oral media (artificial saliva, carbonated orange juice and coffee) on the surface roughness and color stability of 3D printed temporary material. Methodology: twenty one discs samples were designed using additive manufacturing technique (SLA) were divided into 3 groups and stored in artificial saliva, coffee and carbonated orange juice at 37 ℃. Surface roughness was measured before and after immersion using non-contact USB Digital microscope. Color measurements were made before and after immersions using CIE L*a*b*. Data was analyzed by ANOVA followed by Tukey's pair-wise tests. Results: After two, three and twelve weeks of immersion period there was statistically significant difference between the three tested oral media groups regarding the surface roughness. The highest ΔE values were observed in the coffee (3.58, 4.40 and 10.35 ΔE) followed by Carbonated orange juice mean values (3.29, 3.84 and 7.18 ΔE) while the lowest color changes mean values were for A. Saliva immersed group (1.91, 2.29 and 2.98 ΔE) respectively.
Conclusions:1. All different oral media (except A.saliva) used in the present study affected the surface roughness and the color stability of Interim discs constructed using 3-D printing technique. 2. Manufacturing of interim crowns using 3-D printing technique could be used for short-term provisional restoration. 3. This study has shown a strong positive correlation between color change and surface roughness of provisional restorative material.
Statement of the problem:The final surface finish after sintering or after adjustment procedure of monolithic zirconia restorations is an important issue. Currently, there is lack of evidence based recommendations regarding the best surface finishing protocols for achieving optimal surface roughness and translucency of cubic multi layered ultra-translucent monolithic zirconia. Aim: The purpose of this in vitro study was to assess the effect of surface finish protocols (glazing versus polishing) on the surface roughness and translucency of cubic ultra-translucent multi-layered zirconia. Materials and Methods: CAD/CAM fabricated ultra-translucent multi-layer cubic zirconia cylinders were cut into disc-shaped samples and sintered to end up with ( 16) discs of uniform dimensions 11mm diameter and 0.6mm thickness. Disc samples were divided into two equal groups according to the surface finish protocols. Group G: glazing surface finish. Group P: polishing surface finish. Surface roughness (Ra) was assessed by a non-contact profilometer and translucent parameter (TP) was assessed by spectrophotometer. Results: Surface roughness of studied samples of group 1 recorded (0.253±0.0009 µm) and (0.251±0.0024 µm) before and after glazing respectively. While for group 2 revealed (0.2547±0.0002 µm) and (0.2545±0.001 µm) respectively. While for translucent parameter of group 1 revealed (16.0553±2.659) and (15.3714±9.773) before and after glazing respectively. While for group 2 revealed (16.0553±2.659) and (14.242±8.325) respectively. There was a significant difference between both groups showing that glazing gave a smoother surface and more translucency than a polishing surface finish protocol. Conclusions: Glazing of cubic ultra-translucent multi-layered zirconia is better than polished surface finishing protocol regarding surface roughness and translucency.
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