Effect of Thickness of High-Translucent and Super-Translucent Monolithic Zirconia Restorations on their Translucency Parameter, Color, Internal, Marginal, and Occlusal Adaptation

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Varzandeh Rambod; Foulad Armin; Kolivand Soodabeh; Zamanian Amirhosein

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Journal Paper

Paper Information

Journal: REGENERATION, RECONSTRUCTION & RESTORATION Year:2024 | Volume:9 | Issue:1 Page(s): 1-9

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Information Journal Paper

Title

Effect of Thickness of High-Translucent and Super-Translucent Monolithic Zirconia Restorations on their Translucency Parameter, Color, Internal, Marginal, and Occlusal Adaptation

Author(s)

Varzandeh Rambod | Foulad Armin | Kolivand Soodabeh | Zamanian Amirhosein | Issue Writer Certificate

Keywords

Zirconium Oxide

Color

Ceramics

Dental Marginal Adaptation

Abstract

Background and objectives: This study assessed the effect of thickness of high-translucent (HT) and super-translucent (ST) monolithic zirconia on its color, translucency, and marginal and internal adaptation. Materials and methods: Monolithic zirconia restorations were fabricated from HT and ST zirconia blanks (n=30) with 0. 5-, 1-and 1. 5-mm thicknesses (n=10). The color and translucency parameter (TP) was measured by a spectrophotometer, and marginal gap (MG), internal gap (IG), and occlusal gap (OG) were measured by the replica technique. Results: Zirconia type had no significant effect on TP (P=0. 362) but the effect of thickness was significant (P<0. 001),1. 5-mm thickness yielded the lowest and 0. 5-mm thickness yielded the highest TP. Zirconia type (P<0. 001) and thickness (P=0. 001) had significant effects on color difference (ΔE),ST yielded significantly higher ΔE, and 0. 5-mm thickness resulted in significantly lower ΔE than 1-mm (P=0. 047) and 1. 5-mm (P<0. 001). The MG of both HT and ST increased with thickness (P<0. 05). The IG of 0. 5 mm-thick restorations was significantly higher than 1 mm (P=0. 005) and 1. 5 mm (P=0. 003). In ST restorations, the difference in IG was not significant among different thicknesses (P>0. 05). OG was the highest in 0. 5 mm thickness. In ST restorations, minimum OG was found in 1 mm thickness. Zirconia type had no significant effect on adaptation (P>0. 05). Conclusion: Zirconia type had no significant effect on TP or adaptation. Increasing the thickness decreased TP. ΔE was lower in lower thicknesses, and ST zirconia yielded higher ΔE. Thickness had a direct correlation with MG and an inverse correlation with IG and OG.

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