School of Dentistry, National Yang-Ming University, Taipei, Taiwan.
J Dent. 2011 Apr;39(4):309-15. doi: 10.1016/j.jdent.2011.01.009. Epub 2011 Feb 1.
The influence of light transmitting ability of different fibre posts on the polymerization of a dual-cured resin cement, and the further microleakage of the post-restored endodontically treated teeth were examined.
An LED curing light was used as light source and the measurements of 470 nm irradiances were made at 1mm intervals along the posts (P-Lux, P-White, and P-Steel). The polymerization of a dual-cured resin cement surrounding the posts at five depths (0, 2, 5, 8, and 10mm) from the top was evaluated using micro-Raman spectra after 40s light-curing. Meanwhile, 36 human single-rooted endodontically treated teeth were randomly divided into three groups and restored with these posts and the cement according to the manufacturers' instructions. Microleakages of the post-restored teeth were compared using an electrochemical measurement system on three consecutive days, and statistically analysed using nonparametric tests.
Light transmission through fibre posts was exponentially reduced as the depth increased (p<0.05, R(2)>0.95), and the polymerization of the resin cement beyond the depth of 5mm significantly declined for all specimens (p<0.05). Fibre posts displayed higher value of light transmission, exhibited a higher polymerization rate of surrounding resin cement, and also demonstrated less microleakage; whilst P-Steel posts had the lowest polymerization rate and produced higher microleakage (p<0.017).
The effective radiance along the post was diminished exponentially, which features the insufficient polymerization of a dual-cured resin cement surrounding the posts at apical region and might therefore influence the microleakage of post-restored teeth.
研究不同纤维桩透光能力对双固化树脂水门汀聚合的影响，以及对根管治疗后牙桩修复后微渗漏的影响。
以 LED 光固化灯为光源，在纤维桩（P-Lux、P-White、P-Steel）上每隔 1mm 测量 470nm 辐照度。用光固化 40s 后，用微拉曼光谱仪测量从顶部到 5 个深度（0、2、5、8 和 10mm）的纤维桩周围双固化树脂水门汀的聚合情况。同时，将 36 颗人单根根管治疗后的牙齿随机分为三组，按照厂家的说明用这些桩和粘结剂进行修复。用电化学测量系统连续 3 天比较桩修复后牙齿的微渗漏，并进行非参数检验统计分析。
纤维桩的透光率随深度的增加呈指数下降（p<0.05，R²>0.95），所有样本在 5mm 深度以上的树脂水门汀聚合率明显下降（p<0.05）。纤维桩的透光率较高，周围树脂水门汀的聚合速率较高，微渗漏较少；而 P-Steel 桩的聚合速率较低，微渗漏较多（p<0.017）。
沿桩的有效辐射亮度呈指数衰减，这一特征导致桩周围双固化树脂水门汀在根尖区域聚合不足，可能影响桩修复后牙齿的微渗漏。
