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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of three bleaching agents on the surface properties of three different esthetic restorative materials.
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Effect of three bleaching agents on the surface properties of three different esthetic restorative materials.

机译：三种漂白剂对三种不同美学修复材料的表面性能的影响。

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STATEMENT OF PROBLEM: Information related to the effect of night-guard vital bleaching procedure on the surface properties of esthetic dental restorative materials is incomplete. PURPOSE: The aim of this study was to examine the effects of 3 proprietary carbamide peroxide bleaching agents on the surface properties of 3 dental esthetic restorative materials. MATERIAL AND METHODS: Three bleaching products (Nite White, Opalescence, and Rembrandt Lighten Gel) and 3 restorative materials (Duceram, Fuji II LC, and Silux Plus) were studied. A stainless steel mold and a 6-mm-thick polytetrafluoroethylene plate with a 1-cm-diameter hole were used to prepare 30 standardized specimens for each of the 3 restorative materials tested. Each group was divided into 3 subgroups (n=10). Two specimens from each subgroup were selected to form a control group. Three different carbamide peroxide bleaching agents were applied to each restorative material group for 8 hours per day for 30 days, respectively. Initial roughness measurements (Ra measured in microm) were made by use of a profilometer, at repeated intervals of 24 hours, 48 hours, 1, 2, 3, and 4 weeks (30 days). Surface topography of the specimens was assessed by scanning electron microscopy, and results were compared with the control group graphically. Surface structure and alterations of atomic weight percentages of element were made by use of energy-dispersive x-ray microanalysis. One-way analysis of variance was used to evaluate the surface roughness measurements. Significant results were evaluated with Fisher and Duncan's multiple range test (P<.005) RESULT: Surface roughness values for all restorative materials increased during the bleaching procedure. The only significant increase was found with the effect of Rembrandt bleaching gel on modified glass ionomer cement (mean Ra was 0.48 microm initially, 0.5 microm at 24 hours, 0.75 microm at 2 weeks, and 0.83 microm at 30 days). Surface roughness values increased significantly during the first 2 weeks (P<.005) for all bleaching groups of each restorative material, and no significant changes were seen in the following periods. SEM micrographs of the feldspathic porcelain specimens for each bleaching agent appeared to be similar to the control group. All of the modified glass ionomer specimens revealed serious cracking areas, whereas microfilled composite specimens showed increased surface porosity and cracks in certain areas when compared with control specimens. Surface spectral analyses results indicated a decrease in the SiO(2) content in the feldspathic porcelain and the microfilled composite groups for all bleaching agents. Modified glass ionomer specimens bleached with Nite White and Rembrandt showed an increase in mass percentage of SiO(2), whereas Opalescence specimens showed a decrease. However, there were no significant differences between the groups. CONCLUSION: Within the limitations of this study, no significant difference was found between bleaching agents. Most changes occurred in the first 2 weeks; the products tested were relatively stable in the following test periods. No significant change in the surface roughness of feldspathic porcelain was observed. On the other hand, the microfilled composite tested showed slight changes in the surface roughness. Significant changes were found for the modified glass ionomer cement (P>.005).
机译：问题陈述：有关夜间护理至关重要的漂白程序对美观的牙科修复材料表面性质的影响的信息不完整。目的：这项研究的目的是检查三种专有的过氧化脲酰胺漂白剂对三种牙科修复材料的表面性能的影响。材料和方法：研究了三种漂白产品（Nite White，乳光和伦勃朗减光凝胶）和3种修复材料（Duceram，Fuji II LC和Silux Plus）。使用不锈钢模具和具有1厘米直径孔的6毫米厚的聚四氟乙烯板为每种3种修复材料准备30个标准化样品。每组分为3个亚组（n = 10）。从每个亚组中选择两个标本组成一个对照组。将三种不同的过氧化脲漂白剂分别应用于每个修复材料组，每天8小时，共30天。初始粗糙度测量（Ra以微米为单位）是使用轮廓仪进行的，重复间隔为24小时，48小时，1、2、3和4周（30天）。通过扫描电子显微镜评估样品的表面形貌，并将结果与​​对照组进行图形比较。利用能量色散x射线显微分析法进行了表面结构和元素原子百分数的改变。使用单向方差分析来评估表面粗糙度测量值。通过Fisher和Duncan多范围测试（P <.005）评估了显着结果。结果：在漂白过程中，所有修复材料的表面粗糙度值都增加了。伦勃朗漂白凝胶对改性玻璃离子交联水泥的影响唯一显着增加（平均Ra最初为0.48微米，24小时为0.5微米，2周为0.75微米，30天为0.83微米）。在每种修复材料的所有漂白组的最初2周内，表面粗糙度值均显着增加（P <.005），并且在随后的时间段内未见明显变化。每种漂白剂的长石瓷标本的SEM显微照片似乎与对照组相似。与对照样品相比，所有改性玻璃离聚物样品均显示出严重的开裂区域，而微填充复合材料样品则显示出某些区域的表面孔隙率增加和出现裂纹。表面光谱分析结果表明，对于所有漂白剂，长石瓷和微填充复合材料组中的SiO（2）含量均降低。用Nite White和Rembrandt漂白的改性玻璃离聚物样品显示SiO（2）的质量百分比增加，而乳白样品显示减少。但是，两组之间没有显着差异。结论：在本研究的范围内，漂白剂之间没有发现显着差异。大多数变化发生在前2周;在接下来的测试期间，测试的产品相对稳定。未观察到长石瓷的表面粗糙度有明显变化。另一方面，测试的微填充复合材料的表面粗糙度略有变化。发现改性玻璃离聚物水泥的显着变化（P> .005）。

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