Effect of low-temperature degradation treatment on hardness, color, and translucency of single layers of multilayered zirconia

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry Pub Date : 2025-01-01 DOI:10.1016/j.prosdent.2023.01.023

Mi-Gyoung Park MS, PhD

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引用次数: 0

Abstract

Statement of problem

Evaluating the effect of low-temperature degradation (LTD) on multilayered zirconia blocks is important for the long-term life of zirconia restorations.

Purpose

The purpose of this in vitro study was to analyze the changes in color, translucency, and hardness of a single layer of multilayered zirconia after an LTD treatment.

Material and methods

Ninety multilayered 10×10×1.0-mm zirconia specimens (3M Lava Esthetic) were designed using Auto CAD 2006 (Autodesk) and divided into 6 groups (n=15) based on LTD (no treatment, LTD treatment) and the inherent layer type (incisal, transition, and body). The hardness of each specimen was measured using a microVickers hardness tester. The CIELab color coordinates were measured using a spectrophotometer, and the data were used to calculate the color difference and translucency (TP). Data were analyzed using 2-way ANOVA and the Scheffé test (α=.05).

Results

LTD treatment did not alter the hardness of multilayered zirconia (P=.572). A significant difference was found in the hardness between the layers of multilayered zirconia (P<.001). LTD treatment did not alter the b∗ or L∗ values (P=.773, P=.701) but did change the a∗ values (P<.001). On LTD treatment, the a∗ value was found to decrease. The L∗, a∗, and b∗ values differed based on the respective layer within the material (P<.001). As layers progress from the incisal to the body, the L∗ value decreased and the a∗ and b∗ values increased. In all groups, the color difference values were highest in the following order: the incisal and transition layers < the transition and body layers < the incisal and body layers. On LTD treatment, the color difference between the layers decreased. The LTD treatment did not affect the TP value (P=.208), but the TP value for each layer showed a significant difference (P<.001).

Conclusions

LTD treatment did not affect the optical properties or hardness of the multilayered zirconia. The hardness of the multilayered zirconia increased from the incisal to the body layer. In multilayered zirconia, the brightness decreased from the incisal to the body layer, and red and yellow color changes were observed. The TP of multilayered zirconia increased from the incisal to the body layer.

查看原文本刊更多论文

低温降解处理对多层氧化锆单层硬度、颜色和透光度的影响。

问题陈述：评估低温降解（LTD）对多层氧化锆块的影响对氧化锆修复体的长期寿命非常重要。目的：本体外研究的目的是分析单层多层氧化锆经LTD处理后颜色、半透明度和硬度的变化：使用 Auto CAD 2006 (Autodesk) 设计了 90 个 10×10×1.0 毫米的多层氧化锆试样（3M Lava Esthetic），并根据 LTD（无治疗、LTD 治疗）和固有层类型（切缘、过渡层和主体）将其分为 6 组（n=15）。使用显微维氏硬度计测量每个试样的硬度。使用分光光度计测量 CIELab 色坐标，数据用于计算色差和半透明度（TP）。数据分析采用双向方差分析和谢菲检验（α=.05）：结果：LTD 处理没有改变多层氧化锆的硬度（P=.572）。多层氧化锆各层之间的硬度存在明显差异（PConclusions）：LTD处理并未影响多层氧化锆的光学特性和硬度。从切口层到主体层，多层氧化锆的硬度不断增加。在多层氧化锆中，从切口层到主体层亮度降低，并观察到红色和黄色的颜色变化。多层氧化锆的 TP 从切口层到主体层均有所增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Prosthetic Dentistry 医学-牙科与口腔外科

CiteScore

7.00

自引率

13.00%

发文量

599

审稿时长

69 days

期刊介绍： The Journal of Prosthetic Dentistry is the leading professional journal devoted exclusively to prosthetic and restorative dentistry. The Journal is the official publication for 24 leading U.S. international prosthodontic organizations. The monthly publication features timely, original peer-reviewed articles on the newest techniques, dental materials, and research findings. The Journal serves prosthodontists and dentists in advanced practice, and features color photos that illustrate many step-by-step procedures. The Journal of Prosthetic Dentistry is included in Index Medicus and CINAHL.