Purpose: To evaluate the degree of conversion (DoC) of self-adhesive resin luting cements when irradiated through different fiber post lengths.

Methods: A total of 60 teeth were sectioned to achieve lengths of 4 mm, 7 mm, and 10 mm, while 60 fiber posts were trimmed to give 3 mm, 6 mm, and 9 mm lengths. Post space was created to accommodate the fiber post and 1 mm of luting cement apically. Two self-adhesive resin luting cements (Multilink Speed and RelyX U200) were used. A total of four cycles of 20 s irradiation was done with an attenuated total reflectance Fourier transform infrared spectroscopy reading between each cycle.

Results: The mean ± standard deviation DoC achieved with a light-emitting diode and quartz tungsten halogen for Multilink Speed was 67.4 ± 2.7% and 72.4 ± 4.0%, respectively, while for RelyX U200, the corresponding values were 56.5 ± 2.7% and 62.0 ± 3.8%, respectively. For Multilink Speed, there was no significant difference between the control and the 3 mm group, while for RelyX U200, no significant difference was found between the 6 mm and 9 mm groups. All the other groups showed significant differences.

Conclusion: The DoC reduced as the post length increased.

目的：评估通过不同纤维柱长度辐照的自粘树脂胶结水泥的转化度（DoC）。

方法：将总共​​60颗牙齿切成4mm，7mm和10mm的长度，同时修剪60根纤维桩以得到3mm，6mm和9mm的长度。创建了接杆空间，以容纳纤维接杆和顶部1 mm的粘固水泥。使用了两种自粘型树脂胶泥（Multilink Speed和RelyX U200）。在每个循环之间用衰减的全反射傅里叶变换红外光谱法进行总共20个辐照的四个循环。

结果：对于多链路速度，使用发光二极管和石英钨卤素灯可实现的平均±标准偏差DoC分别为67.4±2.7％和72.4±4.0％，而对于RelyX U200，相应的值分别为56.5±2.7％和62.0分别为±3.8％。对于Multilink Speed，对照组和3 mm组之间没有显着差异，而对于RelyX U200，在6 mm和9 mm组之间没有显着差异。其他所有组均显示出显着差异。

结论： DoC随着帖子长度的增加而减少。