Influence of Filler Content on the Marginal Sealing of Light-Cured Composite Resin Restorations
填料含量对光固化复合树脂修复体边缘封闭的影响
基本信息
- 批准号:62570855
- 负责人:
- 金额:$ 1.47万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1987
- 资助国家:日本
- 起止时间:1987 至 1988
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This study investigated the role of the filler content in the marginal adaptation of light-cured composite resin restorations. silanized quartz powder was incorporated in Bis-GMA and TEGDMA resin. The filler content levels were 0, 22.4, 39.5, 50.3, 63.5, 69.5, and 71.1 vo1%.Polymerization shrinkage, hygroscopic expansion, and thermal expansion decreased linearly with increased filler content. The shear bond strength to the bovine enamel increased when the filler content increased up to 63.5 vo1%, but thereafter no significant differences were detected. The stress relaxation rate decreased at the filler content increased. That was about 20-50% after 5 minutes and about 45-70% after 24 houres. Independently of filler content, the marginal sealing in class V restorations was poor when the restorations were polished or/and thermal cycled immediately after irradiation, and it was excellent when the restorations were only polished after a one-day immersion in water. Microleakage and enamel cracks increased in the below 39.5 vo1% and 50.3 vo1%-filled resin restorations, respectively, when the restorations were polished and thermal cycled after a one-day immersion in water. The immersion of restorations in water for 3 months before thermal cycling improved the marginal sealing at lower filler levels as compared with one-day immersion in water.It was suggested that the factor affecting the marginal sealing the most immediately after irradiation was polymerization shrinkage stress, and that additional stresses caused by polishing or thermal cycling can destroy the marginal sealing. However, after a one-day immersion in water, shrinkage stress was almost eliminated and the factor with the greatest influence was the difference in thermal expansion between the resin and the tooth structure. Hygroscopic expansion caused by threemonths immersion in water can eliminate the influence of thermal expansion even at lower filler levels.
本研究探讨了填料含量对光固化复合树脂修复体边缘适应性的影响。硅化石英粉掺入Bis-GMA和TEGDMA树脂中。填料含量分别为0、22.4、39.5、50.3、63.5、69.5、71.1 vo1%。聚合收缩、吸湿膨胀和热膨胀随填料含量的增加而线性降低。当填料含量增加到63.5 vo1%时,与牛牙釉质的剪切结合强度有所增加,但此后无显著差异。随着填料含量的增加,应力松弛率减小。5分钟后是20-50%,24小时后是45-70%。与填料含量无关,当修复体在照射后立即抛光或/和热循环时,V类修复体的边缘密封性较差,而当修复体在水中浸泡一天后仅抛光时,其边缘密封性很好。在39.5 vo1%以下的树脂修复体和50.3 vo1%以下的树脂修复体浸泡1天后进行抛光和热循环,微渗漏和牙釉质裂纹分别增加。在热循环之前,修复体在水中浸泡3个月,与在水中浸泡1天相比,在较低填充水平下,修复体的边缘密封性得到了改善。结果表明,辐照后最直接影响边缘密封的因素是聚合收缩应力,抛光或热循环产生的附加应力会破坏边缘密封。然而,在水中浸泡一天后,收缩应力几乎消除,影响最大的因素是树脂与牙齿结构之间的热膨胀差异。在水中浸泡三个月引起的吸湿膨胀可以消除热膨胀的影响,即使在较低的填料水平。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Miki Iga: "Influence of Filler Content on the Marginal Sealing of Light-Cured Composite Resin Restorations" The Japanese Journal of Conservative Dentistry. 32. (1989)
Miki Iga:“填料含量对光固化复合树脂修复体边缘密封的影响”《日本保守牙科杂志》。
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- 影响因子:0
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IGA Miki其他文献
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{{ truncateString('IGA Miki', 18)}}的其他基金
Effect of Fluoride-releasing Resin Fissure Sealant on the Decalcification Layer of Root Dentin
释氟树脂窝沟封闭剂对牙根牙本质脱钙层的影响
- 批准号:
63570889 - 财政年份:1988
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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