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首页> 外文期刊>Quintessence international >Effect of delayed light polymerization of a dual-cured composite base on microleakage of Class 2 posterior composite open-sandwich restorations.
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Effect of delayed light polymerization of a dual-cured composite base on microleakage of Class 2 posterior composite open-sandwich restorations.

机译：双重固化复合材料基体的延迟光聚合对2类后复合开放夹层修复体微渗漏的影响。

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OBJECTIVE: To determine the effect of delayed start of light polymerization of a dual-cured composite base on the microleakage of Class 2 open-sandwich composite restorations. METHOD AND MATERIALS: Fifty extracted human molars were used to prepare Class 2 mesio-occlusal and disto-occlusal slot preparations. Teeth were randomly divided into 2 groups and restored with a base of dual-cured composite in the proximal box and a top layer of light-cured composite. Group I was restored with a 1-step dual-cured bonding agent; group II was restored with a 2-step dual-cured bonding agent. Five subgroups were created according to the method of polymerization of the dual-cured composite: (A) self-cured, (B) light-cured immediately, (C) light-cured 30 seconds after placement, (D) light-cured 60 seconds after placement, and (E) light-cured 120 seconds after placement. Restorations were stored for 1 week at 37 degrees C and 100% relative humidity, thermocycled (2,000 times, 5 degrees C to 55 degrees C, 15-second dwell), and immersed in a 1% aqueous solution of methylene blue for 24 hours at 37 degrees C. Samples were sectioned mesiodistally, and dye penetration at enamel, dentin, and cementum margins was scored under a stereomicroscope using an ordinal scoring system. RESULTS: Statistical analysis using analysis of variance (ANOVA) on ranks showed that the dual-cured composite light polymerized 1 minute after placement exhibited the lowest microleakage (P < .05) in both bonding agent groups. CONCLUSION: Delayed, rather than immediate, light polymerization of the dual-cured composite base reduced microleakage in Class 2 open-sandwich restorations.
机译：目的：确定双固化复合材料基体光聚合延迟启动对2类开放式夹心复合材料修复体微渗漏的影响。方法和材料：用五十颗提取的人类磨牙制备2类近牙合和二牙合缝准备。牙齿被随机分为2组，并在近端盒子中用双固化复合材料的基体和光固化复合材料的顶层修复。 I组用1步双固化粘合剂恢复;第二组用两步双固化粘合剂恢复。根据双固化复合材料的聚合方法创建了五个亚组：（A）自固化，（B）立即光固化，（C）放置后30秒光固化，（D）光固化60放置后30秒内（E）放置120秒后光固化。将修复物在37°C和100％相对湿度下存储1周，进行热循环（2,000次，5°C至55°C，15秒驻留），并在1％的亚甲基蓝水溶液中浸泡24小时。 37摄氏度。近距离切开样品，并使用立体评分系统在立体显微镜下对牙釉质，牙本质和牙骨质边缘的染料渗透进行评分。结果：使用等级差异分析（ANOVA）进行的统计分析表明，放置后1分钟聚合的双固化复合轻质材料在两个粘合剂组中均表现出最低的微渗漏（P <.05）。结论：双重固化复合材料基体的延迟聚合而不是立即聚合可以减少2类夹心修复体的微渗漏。

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