Degree of conversion of dual-cured resin cement light-cured through three fibre posts within human root canals: an ex vivo study
Degree of conversion of dual-cured resin cement light-cured through three fibre posts within human root canals: an ex vivo study
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DOI：
10.1111/j.1365-2591.2009.01565.x
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发表时间：
2009-08-01
影响因子：
5
通讯作者：
Kwon, T. Y.
中科院分区：
文献类型：
--
作者：
Kim, Y. K.;Kim, S. K.;Kwon, T. Y.
目的评价三根纤维桩光固化双固化树脂水泥在人拔牙内的转化程度。方法对15颗下颌前磨牙进行牙根充填，并分为3组。Variolink II通过根管内柱（LP， D.T. Light-Post； PP, FRC Postec Plus； SP, Snowpost）进行光固化。利用光学显微镜连接FTIR分光光度计（n = 10），在9mm深的纵向切根管内每隔1mm测量一次转化度。每个测试桩的透光性也用紫外-可见光谱进行了检测。数据分析采用方差分析和Tukey检验（α = 0.05）。结果LP和PP的透光率分别为10.2%和7.7%，而SP的透光率较低，为0.5%。根据岗位深度和岗位类型的不同，转换程度平均值在32.78% ~ 69.73%之间。各组中椎体的转换度值均显著低于颈椎区（P < 0.05）。除1 mm深度外，SP组的转化度值均显著低于其他各组（P < 0.05）。线性回归分析结果显示，每组柱子的透光率与整体转换度值有较强的相关性（R-2 = 0.9888）。结论Variolink II相对于深度的转换程度的降低取决于所测桩的透光能力。
P>AimTo evaluate the degree of conversion of one dual-cured resin cement light-cured through three fibre posts within extracted human teeth.MethodologyFifteen mandibular premolars were root filled and then divided into three groups. Variolink II was light-cured through the posts (LP, D.T. Light-Post; PP, FRC Postec Plus; SP, Snowpost) within the root canal. The degree of conversion was obtained at 1 mm intervals in 9 mm-deep longitudinally sectioned root canals using an optical microscope connected to an FTIR spectrophotometer (n = 10). The light transmission of each post tested was also examined using UV-Vis spectroscopy. Data were analysed using anova and Tukey's test (alpha = 0.05).ResultsThe LP and PP posts revealed a light transmission of 10.2% and 7.7%, respectively, whereas the SP post exhibited a significantly lower value of 0.5%. The degree of conversion mean value ranged from 32.78% to 69.73% depending on the depth and type of post. For all the groups, there were significant decreases in the degree of conversion values for the middle region when compared with those for the cervical region (P < 0.05). Except at a depth of 1 mm, the SP group consistently exhibited significantly lower degree of conversion values than the other groups (P < 0.05). The linear regression analysis revealed a strong correlation between the light transmission of the posts and the overall degree of conversion value for each group (R-2 = 0.9888).ConclusionsThe decrease in the degree of conversion for Variolink II relative to the depth was dependent on the light transmission capacity of the posts tested.