不同厚度硅酸锂基陶瓷下层的树脂水门汀的硬度。

Hardness of resin cement cured under different thickness of lithium disilicate-based ceramic.

机构信息

Medical Office, Chinese People's Liberation Army General Hospital, Beijing 100853, China.

出版信息

Chin Med J (Engl). 2011 Nov;124(22):3762-7.

Abstract

BACKGROUND

The lithium disilicate-based ceramic is a newly developed all-ceramic material, which is lithium disilicate-based and could be used for fabricating almost all kinds of restorations. The extent of light attenuation by ceramic material was material-dependent. Ceramic materials with different crystal composition or crystalline content would exhibit distinct light-absorbing characteristics. The aim of this study was to analyze the influence of ceramic thickness and light-curing time on the polymerization of a dual-curing resin luting material with a lithium disilicate-based ceramic.

METHODS

A lithium disilicate-based ceramic was used in this study. The light attenuation caused by ceramic with different thickness was determined using a spectral radiometer. The commercial dual-cured resin cement was light-cured directly or through ceramic discs with different thickness (1, 2 and 3 mm, respectively) for different times (10, 20, 30, 40, 50 and 60 seconds, respectively). The polymerization efficiency of resin cement was expressed in terms as Vickers hardness (VHN) measured after 24 hours storage. Two-way analysis of variance (ANOVA) and Tukey's HSD tests were used to determine differences.

RESULTS

Intensity of polymerizing light transmitted through ceramic discs was reduced from 584 mW/cm(2) to about 216 mW/cm(2)2, 80 mW/cm(2) and 52 mW/cm(2) at thicknesses of 1 mm, 2 mm and 3 mm, respectively. Resin cement specimens self-cured alone showed significantly lower hardness values. When resin cement was light-cured through ceramic discs with a thickness of 1 mm, 2 mm and 3 mm, no further increasing in hardness values was observed when light-curing time was more than 30 seconds, 40 seconds and 60 seconds, respectively.

CONCLUSIONS

Within the limitation of the present study, ceramic thickness and light-curing time had remarkable influence on the polymerization of dual-cured resin cement. When resin cement is light-cured beneath a lithium disilicate ceramic with different thickness, prolonging light-curing time accordingly may still be necessary to insure complete polymerization.

摘要

背景

锂硅基陶瓷是一种新开发的全陶瓷材料，它以锂硅为基础，可以用于制作几乎所有类型的修复体。陶瓷材料对光的衰减程度取决于材料。具有不同晶体组成或结晶含量的陶瓷材料会表现出明显的吸光特性。本研究的目的是分析陶瓷厚度和光固化时间对具有锂硅基陶瓷的双固化树脂水门汀聚合的影响。

方法

本研究使用了一种锂硅基陶瓷。使用光谱辐射计测定不同厚度陶瓷引起的光衰减。直接将商用双固化树脂水泥光固化，或通过分别具有 1、2 和 3 毫米厚度的陶瓷片进行光固化，时间分别为 10、20、30、40、50 和 60 秒。树脂水泥的聚合效率以 24 小时储存后的维氏硬度（VHN）表示。采用双向方差分析（ANOVA）和 Tukey 的 HSD 检验来确定差异。

结果

透过陶瓷片的聚合光强度从 584 mW/cm(2)降至约 216 mW/cm(2)、80 mW/cm(2)和 52 mW/cm(2)，分别在厚度为 1 毫米、2 毫米和 3 毫米时。单独自固化的树脂水泥试件显示出明显较低的硬度值。当树脂水泥通过厚度为 1 毫米、2 毫米和 3 毫米的陶瓷片光固化时，当光固化时间超过 30 秒、40 秒和 60 秒时，硬度值没有进一步增加。