自粘结树脂水门汀的吸附和解离特性。

Sorption and solubility characteristics of self-adhesive resin cements.

机构信息

Conservative Dental Science (CDS) Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.

出版信息

Dent Mater. 2012 Oct;28(10):e187-98. doi: 10.1016/j.dental.2012.04.037. Epub 2012 May 17.

DOI:10.1016/j.dental.2012.04.037

PMID:22607764

Abstract

OBJECTIVE

The aim of this in vitro study was to evaluate some sorption characteristics [sorption (S), solubility (SL) and the percentages of mass change (M(g)%), solubility (SL%) as well as sorbed liquid (S%)] of self-adhesive resin cements when immersed in distilled water and lactic acid.

METHODS

A disc-shaped specimen of each self-adhesive resin cements [G-Cem (GC), SmartCem™ 2 (SC2), RelyX™ U100 (R1), RelyX™ Unicem 2 (RU2)] were prepared in a split-Teflon mold and irradiated by an Optilux 501 light cure at 580mW/cm(2) for 40s in eight overlapping sections each side. The volume of each specimen was calculated and placed inside a desiccator containing anhydrous calcium chloride, then weighed on an analytical electronic balance. Two independent groups were established according to the immersion media or liquids (distilled water and 0.01M lactic acid) maintained at 37°C for the time intervals: 1, 6, 12, 24, 48 and 168h, where the sorption (S) property (μg/mm(3)) was calculated. However, the SL, M(g)%, SL% and S% were measured after 168h of immersion. The data were statistically analyzed by repeated measures ANOVA, one-way ANOVA and post hoc Tukey's test (p<0.05).

RESULTS

Analysis of variance revealed highly significant differences between the materials for the sorption and solubility values examined with some exceptions (p<0.05). However, independent samples T-test expressed significant differences of all the sorption values between both water and lactic acid media for the resin cements with some border significances (p>0.05). The highest liquid's sorption was exhibited by GC material after immersion in lactic acid for 168h period followed by SC2 (37.83 and 34.15μg/mm(3), respectively), while the lowest sorption was presented by RU2 cement after 1h immersion period in water (3.89μg/mm(3)). Stereomicroscope showed homogenous surface topography in RU2 and R1 samples, while some striated cracks and microvoids were observed in GC and SC2 materials, respectively. The SL values followed this order: RU2<R1<SC2<GC.

SIGNIFICANCE

Knowing the best self-adhesive cement that can provide less sorption and solubility values will help the dentist to choose the most suitable luting material for indirect restorations.

摘要

目的

本体外研究的目的是评估自粘结树脂水门汀在蒸馏水和乳酸中的一些吸附特性[吸附（S）、溶解度（SL）和质量变化百分比（M(g)%)、溶解度（SL%）以及吸附液体（S%）]。

方法

采用分体式聚四氟乙烯模具制备各自粘结树脂水门汀[GC（G-Cem）、SC2（SmartCem™ 2）、R1（RelyX™ U100）、RU2（RelyX™ Unicem 2）]的圆盘状试件，在每侧 8 个重叠部分以 580mW/cm(2)的光强进行 40s 的光照固化。计算每个试件的体积，并将其放置在一个含有无水氯化钙的干燥器中，然后在分析电子天平上称重。根据浸液介质或液体（蒸馏水和 0.01M 乳酸）将两组独立样本维持在 37°C 下的时间间隔为 1、6、12、24、48 和 168h，其中计算吸附（S）特性（μg/mm(3))。然而，在浸泡 168h 后测量 SL、M(g)％、SL％和 S％。采用重复测量方差分析、单因素方差分析和事后 Tukey 检验对数据进行统计学分析（p<0.05）。

结果

方差分析显示，在所检查的吸附和溶解度值方面，各材料之间存在高度显著差异，但存在一些例外（p<0.05）。然而，独立样本 T 检验表示，对于在水和乳酸介质中浸泡的树脂水门汀，所有吸附值之间存在显著差异，只有一些边缘显著性（p>0.05）。GC 材料在乳酸中浸泡 168h 后表现出最高的液体吸附，其次是 SC2（分别为 37.83 和 34.15μg/mm(3))，而 RU2 水门汀在水中浸泡 1h 后表现出最低的吸附（3.89μg/mm(3))。立体显微镜显示 RU2 和 R1 样品具有均匀的表面形貌，而 GC 和 SC2 材料分别显示出一些条纹状裂纹和微空隙。SL 值依次为 RU2<R1<SC2<GC。