固化速率对树脂复合材料在乙醇中的软化、转化率及磨损的影响。

Influence of curing rate on softening in ethanol, degree of conversion, and wear of resin composite.

作者信息

Benetti Ana Raquel, Peutzfeldt Anne, Asmussen Erik, Pallesen Ulla, Franco Eduardo Batista

机构信息

University North of Parani (UNOPAR) Center of Biological and Health Sciences, Av. Paris 675, Jd. Piza, 86041-140, Caixa Postal 401, Londrina PR, Brazil.

出版信息

Am J Dent. 2011 Apr;24(2):115-8.

PMID:21698992

Abstract

PURPOSE

To investigate the effect of curing rate on softening in ethanol, degree of conversion, and wear of resin composites.

METHOD

With a given energy density and for each of two different light-curing units (QTH or LED), the curing rate was reduced by modulating the curing mode. Thus, the irradiation of resin composite specimens (Filtek Z250, Tetric Ceram, Esthet-X) was performed in a continuous curing mode and in a pulse-delay curing mode. Wallace hardness was used to determine the softening of resin composite after storage in ethanol. Degree of conversion was determined by infrared spectroscopy (FTIR). Wear was assessed by a three-body test. Data were submitted to Levene's test, one and three-way ANOVA, and Tukey HSD test (alpha = 0.05).

RESULTS

Immersion in ethanol, curing mode, and material all had significant effects on Wallace hardness. After ethanol storage, resin composites exposed to the pulse-delay curing mode were softer than resin composites exposed to continuous cure (P< 0.0001). Tetric Ceram was the softest material followed by Esthet-X and Filtek Z250 (P< 0.001). Only the restorative material had a significant effect on degree of conversion (P< 0.001): Esthet-X had the lowest degree of conversion followed by Filtek Z250 and Tetric Ceram. Curing mode (P= 0.007) and material (P< 0.001) had significant effect on wear. Higher wear resulted from the pulse-delay curing mode when compared to continuous curing, and Filtek Z250 showed the lowest wear followed by Esthet-X and Tetric Ceram.

摘要

目的

研究固化速率对树脂复合材料在乙醇中软化、转化率及磨损的影响。

方法

在给定能量密度下，针对两种不同的光固化设备（石英卤钨灯或发光二极管），通过调整固化模式降低固化速率。因此，树脂复合材料试件（Filtek Z250、Tetric Ceram、Esthet-X）的照射分别采用连续固化模式和脉冲延迟固化模式。使用华莱士硬度来测定树脂复合材料在乙醇中储存后的软化情况。通过红外光谱（傅里叶变换红外光谱法）测定转化率。通过三体试验评估磨损情况。数据进行了Levene检验、单因素和三因素方差分析以及Tukey HSD检验（α = 0.05）。

结果

浸泡在乙醇中、固化模式和材料对华莱士硬度均有显著影响。在乙醇储存后，采用脉冲延迟固化模式的树脂复合材料比采用连续固化的树脂复合材料更软（P < 0.0001）。Tetric Ceram是最软的材料，其次是Esthet-X和Filtek Z250（P < 0.001）。只有修复材料对转化率有显著影响（P < 0.001）：Esthet-X的转化率最低，其次是Filtek Z250和Tetric Ceram。固化模式（P = 0.007）和材料（P < 0.001）对磨损有显著影响。与连续固化相比，脉冲延迟固化模式导致更高的磨损，Filtek Z250的磨损最低，其次是Esthet-X和Tetric Ceram。