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首页> 外文期刊>Operative dentistry >Volumetric polymerization shrinkage of resin composites under simulated intraoral temperature and humidity conditions.
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Volumetric polymerization shrinkage of resin composites under simulated intraoral temperature and humidity conditions.

机译：在模拟的口腔温度和湿度条件下，树脂复合材料的体积聚合收缩率。

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This study measured the volumetric shrinkage of resin composites polymerized under temperature and humidity conditions simulating the oral cavity and compared them to those occurring under ambient room conditions. Small, semispherical specimens of a microhybrid (Z100), microfill (Filtek A110) and flowable microhybrid (4 Seasons Flow) resin composite were manually formed and light activated for 40 seconds using a halogen light-curing unit (Spectrum Curing Light). The volumetric polymerization shrinkage of 10 specimens of each brand of resin composite was measured using a drop shape analysis unit (Drop Shape Analysis System, model DSA10 Mk2) under each of two temperature/relative humidity conditions: room conditions (22 +/- 2 degrees C and 60 +/- 5%) and those simulating intraoral conditions (35 degrees C and 92 +/- 5%). Mean volumetric shrinkage values were calculated for each resin composite and the data were analyzed using two-way analysis of variance and t-test (a=0.05) to determine if significant differences existed between the amount of volumetric polymerization shrinkage that occurred under ambient room conditions and that which occurred under simulated intraoral conditions. Mean volumetric shrinkage values measured for the resin composites were: 2.26 +/- 0.04% (ambient) and 2.61 +/- 0.04% (intraoral) for Z100; 1.96 +/- 0.04% (ambient) and 2.28 +/- 0.04% (intraoral) for Filtek A110 and 4.53 +/- 0.06% (ambient) and 5.34 +/- 0.05% (intraoral) for 4 Seasons Flow. For each resin composite, statistical analysis indicated that the amount of volumetric shrinkage measured under simulated intraoral conditions was significantly greater than what was measured under ambient room conditions (p<0.0001).
机译：这项研究测量了在模拟口腔的温度和湿度条件下聚合的树脂复合材料的体积收缩率，并将其与在室温条件下发生的收缩率进行了比较。手动形成微混合体（Z100），微填充物（Filtek A110）和可流动微混合体（4 Seasons Flow）树脂复合物的小半球形样品，并使用卤素光固化单元（Spectrum Curing Light）将其光活化40秒。使用液滴形状分析装置（Drop Shape Analysis System，型号DSA10 Mk2）在两个温度/相对湿度条件下（室温）（22 +/- 2度）中的每一个，测量每个品牌的树脂复合材料的10个样品的体积聚合收缩率C和60 +/- 5％）和模拟口内疾病的条件（35摄氏度和92 +/- 5％）。计算每种树脂复合材料的平均体积收缩值，并使用方差和t检验的双向分析（a = 0.05）分析数据，以确定在室温条件下发生的体积聚合收缩量之间是否存在显着差异以及在模拟口内条件下发生的情况。对树脂复合材料测得的平均体积收缩值为：Z100为2.26 +/- 0.04％（环境）和2.61 +/- 0.04％（口内）; Filtek A110为1.96 +/- 0.04％（环境）和2.28 +/- 0.04％（口腔），4季节流量为4.53 +/- 0.06％（环境）和5.34 +/- 0.05％（口腔）。对于每种树脂复合材料，统计分析表明，在模拟口内条件下测得的体积收缩量明显大于在室温条件下测得的体积收缩量（p <0.0001）。

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