The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim

Introduction: The recommended aesthetic criteria for obtaining excellent masking ability of monolithic zirconia restoration involves the influence of abutment substrates and the thickness of the restoration factors. However, the effect of this factors on masking ability of monolithic zirconia restor...

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Main Author:	Kassim, Mohd Zulkifli
Format:	Thesis
Language:	English
Published:	2021
Subjects:	Prosthetic dentistry Prosthodontics
Online Access:	https://ir.uitm.edu.my/id/eprint/66954/1/66954.pdf
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id	my-uitm-ir.66954
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spelling	my-uitm-ir.669542022-09-19T08:49:56Z The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim 2021 Kassim, Mohd Zulkifli Prosthetic dentistry. Prosthodontics Introduction: The recommended aesthetic criteria for obtaining excellent masking ability of monolithic zirconia restoration involves the influence of abutment substrates and the thickness of the restoration factors. However, the effect of this factors on masking ability of monolithic zirconia restorations remains unclear. Hence, this study was carried out to determine the minimum thickness of monolithic zirconia to achieved acceptable masking ability and to evaluate the effects of brands, thickness and types of different substrates on colour difference. Material and Methods: 72 square-shaped disk specimens from 3 commercially available A2 shade translucent monolithic zirconia brands; Group HTA (Nacera® Pearl 1), Group HTB (DD cubeX2) and Group HTC (XTCERA TT) were prepared into 3 different thicknesses (1.0, 1.5 and 2.0 mm) according to manufacturer’s instruction (n:8). The specimens were placed on a D4-shade resin composite (SB) and white acrylic (control) substrate, and their CIELab values were measured with a spectrophotometer. ΔE were calculated and compared with the established acceptable (ΔE = 5.5) and perceptible (ΔE = 2.6) tolerance thresholds. Brand specimens that showed greatest masking ability were further analysed on another 2 abutment substrates, D3 shade resin composite (SA) and precious gold alloy (SC). Two-way ANOVA was used to assess the interaction of brand, thickness and types of abutment substrates on ΔE. Results: Acceptable tolerance threshold was achieved with combination of brand and abutment substrates of specimen’s thickness; HTA-SA (1.5 mm), HTA-SB (1.5 mm), HTA-SC (1.0 mm), HTB-SB (2.0 mm) and HTC-SB (2.0 mm), while HTA-SA (2.0 mm), HTA-SB (2.0 mm) and HTA-SC (1.5 and 2.0 mm) achieved perceptible tolerance threshold. Zirconia brand, thickness and abutment substrates affects the ΔE (P<0.001). Conclusion: Within limitation of this study, acceptable masking ability of monolithic zirconia mostly could be achieved with 2.0 mm thickness. Types of abutment substrates, brands and thickness affects the masking ability of translucent monolithic zirconia. 2021 Thesis https://ir.uitm.edu.my/id/eprint/66954/ https://ir.uitm.edu.my/id/eprint/66954/1/66954.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) Faculty of Dentistry Mustafa, Nor Wati@Nur Atikah Ahmad, Rohana
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Mustafa, Nor Wati@Nur Atikah Ahmad, Rohana
topic	Prosthetic dentistry Prosthodontics
spellingShingle	Prosthetic dentistry Prosthodontics Kassim, Mohd Zulkifli The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim
description	Introduction: The recommended aesthetic criteria for obtaining excellent masking ability of monolithic zirconia restoration involves the influence of abutment substrates and the thickness of the restoration factors. However, the effect of this factors on masking ability of monolithic zirconia restorations remains unclear. Hence, this study was carried out to determine the minimum thickness of monolithic zirconia to achieved acceptable masking ability and to evaluate the effects of brands, thickness and types of different substrates on colour difference. Material and Methods: 72 square-shaped disk specimens from 3 commercially available A2 shade translucent monolithic zirconia brands; Group HTA (Nacera® Pearl 1), Group HTB (DD cubeX2) and Group HTC (XTCERA TT) were prepared into 3 different thicknesses (1.0, 1.5 and 2.0 mm) according to manufacturer’s instruction (n:8). The specimens were placed on a D4-shade resin composite (SB) and white acrylic (control) substrate, and their CIELab values were measured with a spectrophotometer. ΔE were calculated and compared with the established acceptable (ΔE = 5.5) and perceptible (ΔE = 2.6) tolerance thresholds. Brand specimens that showed greatest masking ability were further analysed on another 2 abutment substrates, D3 shade resin composite (SA) and precious gold alloy (SC). Two-way ANOVA was used to assess the interaction of brand, thickness and types of abutment substrates on ΔE. Results: Acceptable tolerance threshold was achieved with combination of brand and abutment substrates of specimen’s thickness; HTA-SA (1.5 mm), HTA-SB (1.5 mm), HTA-SC (1.0 mm), HTB-SB (2.0 mm) and HTC-SB (2.0 mm), while HTA-SA (2.0 mm), HTA-SB (2.0 mm) and HTA-SC (1.5 and 2.0 mm) achieved perceptible tolerance threshold. Zirconia brand, thickness and abutment substrates affects the ΔE (P<0.001). Conclusion: Within limitation of this study, acceptable masking ability of monolithic zirconia mostly could be achieved with 2.0 mm thickness. Types of abutment substrates, brands and thickness affects the masking ability of translucent monolithic zirconia.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Kassim, Mohd Zulkifli
author_facet	Kassim, Mohd Zulkifli
author_sort	Kassim, Mohd Zulkifli
title	The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim
title_short	The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim
title_full	The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim
title_fullStr	The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim
title_full_unstemmed	The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim
title_sort	effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / mohd zulkifli kassim
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Dentistry
publishDate	2021
url	https://ir.uitm.edu.my/id/eprint/66954/1/66954.pdf
_version_	1783735651071426560

The effect of thickness and abutment substrates on masking ability of translucent monolithic zirconia ceramics / Mohd Zulkifli Kassim

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