Shadman Niloofar, Atai Mohammad, Ghavam Maryam, Kermanshah Hamid, Ebrahimi Shahram Farzin
Iran Polymer and Petrochemical Institute, Tehran, Iran.
J Can Dent Assoc. 2012;78:c53.
To evaluate the degree of conversion of dual-cured resin cements applied for luting of translucent and opaque fibre posts.
Two dual-cured resin cements, RelyX ARC and Nexus 2, were used to cement 2 types of tooth-coloured fibre posts, D.T. Light-Post (translucent) and D.T. White-Post (opaque). The degree of conversion for each resin cement was measured. Post-curing polymerization and chemical curing of the cements were also measured. The degree of conversion was measured at various distances (4, 6 and 8 mm) from the tip of the light-curing unit by Fourier transform infrared spectroscopy. The data were analyzed with analysis of variance and post hoc tests (α = 0.05).
The degree of conversion of the dual-cure cements was significantly higher with the D.T. Light-Posts than with the D.T. White-Posts (p < 0.05). No significant difference was observed in the degree of conversion at different depths for the RelyX ARC resin cement in conjunction with the D.T. Light-Posts (p > 0.05). The overall degree of conversion decreased linearly with increasing distance from the light-curing tip. Monitoring of post-curing polymerization and chemical curing revealed no further increase in degree of conversion after 5 minutes (p > 0.05).
The translucent fibre posts (D.T. Light-Posts) allowed a significantly higher degree of conversion with dual-cure resin cements than the opaque fibre posts (D.T. White-Posts) because of the light-transmitting property of their optical fibres.
评估用于粘结半透明和不透明纤维桩的双重固化树脂水门汀的固化程度。
使用两种双重固化树脂水门汀，RelyX ARC和Nexus 2，粘结两种牙色纤维桩，D.T. Light-Post（半透明）和D.T. White-Post（不透明）。测量每种树脂水门汀的固化程度。还测量了水门汀的后固化聚合和化学固化情况。通过傅里叶变换红外光谱法在距光固化装置尖端不同距离（4、6和8毫米）处测量固化程度。数据采用方差分析和事后检验进行分析（α = 0.05）。
使用D.T. Light-Post时，双重固化水门汀的固化程度显著高于使用D.T. White-Post时（p < 0.05）。对于RelyX ARC树脂水门汀与D.T. Light-Post结合使用时，在不同深度处的固化程度未观察到显著差异（p > 0.05）。随着距光固化尖端距离的增加，总体固化程度呈线性下降。后固化聚合和化学固化的监测显示，5分钟后固化程度没有进一步增加（p > 0.05）。
由于半透明纤维桩（D.T. Light-Post）的光纤具有透光特性，与不透明纤维桩（D.T. White-Post）相比，双重固化树脂水门汀在其上面的固化程度显著更高。
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