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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effects of occlusal loading and thermocycling on the marginal gaps of light-polymerized and autopolymerized resin provisional crowns.
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Effects of occlusal loading and thermocycling on the marginal gaps of light-polymerized and autopolymerized resin provisional crowns.

机译：咬合负荷和热循环对轻聚合和自聚合树脂临时牙冠的边缘间隙的影响。

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摘要

STATEMENT OF PROBLEM: Resin crowns appear to be increasingly at risk for increases in marginal gap size as a result of thermocycling and occlusal loading. PURPOSE: This in vitro study compared the effects of occlusal loading and thermocycling on the margins of provisional crowns made from a conventional autopolymerized provisional acrylic resin (Jet) to those made from a light-polymerized resin (Unifast LC). METHODS AND MATERIAL: Crowns made from the 2 materials were thermocycled and loaded on custom dies to simulate 6 to 8 weeks of oral function. Gap sizes were measured before and after thermocycling and occlusal loading. RESULTS: Provisional crowns made from light-polymerized resin exhibited smaller changes in marginal gap size than did those made from conventional autopolymerized resin. CONCLUSIONS: The improved characteristics of the light-polymerized material may prove useful for provisional crowns that must remain for long periods in the oral environment.
机译：问题陈述：由于热循环和咬合负荷的影响，树脂牙冠的边缘间隙尺寸增大的风险似乎越来越大。目的：这项体外研究比较了咬合负荷和热循环对由常规自聚合临时丙烯酸树脂（Jet）制成的临时牙冠与由轻聚合树脂（Unifast LC）制成的临时牙冠的边缘的影响。方法和材料：将由两种材料制成的牙冠进行热循环，并加载到定制模具上，以模拟6至8周的口腔功能。在热循环和咬合负荷之前和之后测量间隙大小。结果：与传统的自聚合树脂相比，由轻聚树脂制成的临时牙冠在边缘间隙尺寸上的变化较小。结论：光聚合材料的改进特性可能被证明对于必须在口腔环境中长期保留的临时牙冠很有用。

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