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不同核厚度的二硅酸锂陶瓷对金属基底上间接修复体颜色匹配的遮色能力比较评估：一项研究

Comparative Evaluation of the Masking Ability of Lithium Disilicate Ceramic with Different Core Thickness on the Shade Match of Indirect Restorations over Metallic Substrate: An Study.

作者信息

Thilagar Priyadarshini, Sampathkumar Jayakrishnakumar, Krishnan Chitra Shankar, Ramakrishnan Hariharan, Ramasubramanian Hariharan, Azhagarasan N S

机构信息

Affliated to the Tamil Nadu Dr. M.G.R Medical University, Ragas Dental College and Hospital, Uthandi, Chennai, Tamil Nadu, India.

Department of Prosthodontics and Implantology, Ragas Dental College and Hospital, Uthandi, Chennai, Tamil Nadu, India.

出版信息

Contemp Clin Dent. 2019 Jan-Mar;10(1):56-63. doi: 10.4103/ccd.ccd_301_18.

DOI:10.4103/ccd.ccd_301_18
PMID:32015643
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6974991/
Abstract

PURPOSE

The purpose of this study was to comparatively evaluate the masking ability of lithium disilicate ceramic with different core thickness on the shade match of indirect restorations over metallic substrate.

MATERIALS AND METHODS

A total of 30 heat pressed lithium disilicate ceramic discs of low translucency were fabricated with diameter 10mm and thickness of 1 mm, 1.3 mm and 1.6mm with each thickness consisting of 10 samples to be used in the study. Thirty Ni-Cr metal discs of diameter 10mm were used to simulate metallic substrates .The colour difference of the lithium disilicate ceramic disc before and after cementation were measured using CIE LAB system.

RESULTS

The mean colour difference (ΔE) of Group I,Group II, Group III before cementation with the Ni-Cr metal discs was 17.32,13.01 and 11.73 respectively. The mean colour difference (ΔE) of Group I,Group II, Group III after cementation with the Ni-Cr metal discs was 16.32,12.10, 11.05 respectively.

CONCLUSION

The mean colour difference of the three groups were found to be more than the clinically acceptable perceptibility threshold (ΔE < 3.3) indicative of reduced masking ability of all the three groups of ceramic discs over metallic substrate used in this study.

摘要

目的

本研究旨在比较评估不同核厚度的二硅酸锂陶瓷对金属基底上间接修复体颜色匹配的遮色能力。

材料与方法

共制作30个低透明度的热压二硅酸锂陶瓷圆盘，直径10mm，厚度分别为1mm、1.3mm和1.6mm，每种厚度10个样本用于本研究。使用30个直径10mm的镍铬金属圆盘模拟金属基底。采用CIE LAB系统测量二硅酸锂陶瓷圆盘粘结前后的色差。

结果

I组、II组、III组在与镍铬金属圆盘粘结前的平均色差（ΔE）分别为17.32、13.01和11.73。I组、II组、III组在与镍铬金属圆盘粘结后的平均色差（ΔE）分别为16.32、12.10和11.05。

结论

发现三组的平均色差均超过临床可接受的感知阈值（ΔE < 3.3），表明本研究中所有三组陶瓷圆盘对所用金属基底的遮色能力降低。

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