Bahari Mahmoud, Savadi Oskoee Siavash, Kimyai Soodabeh, Mohammadi Narmin, Saati Khosroshahi Elmira
Dental and Periodontal Research Center, Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran.
Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran.
J Dent (Tehran). 2014 May;11(3):248-55. Epub 2014 May 31.
To evaluate the effect of different light intensities on the degree of conversion (DC) of dual-cured resin cement at different depths of translucent fiber posts.
Thirty translucent fiber posts were randomly assigned into three (n=10) groups. They were cemented in the simulated canal spaces using Duo-Link dual-cured resin cement. The cement was light-cured under 600, 800 and 1100 mW/cm(2) light intensities for 40 seconds. DC of the resin cement was calculated at cervical, middle and apical thirds using the spectra of FT-Raman spectrometer. Data were analyzed by repeated measurement ANOVA and Tukey's post hoc tests (α=0.05).
In all the groups, the least DC was obtained at the apical region. There were no significant differences in the DC with different light intensities between the cervical and middle regions (p>0.05). However, in the apical region, the DC in both 800 and 1100 mw/cm(2) was similar (p>0.05), but greater with 600 mW/cm(2) light intensity (p=0.02 and p<0.001, respectively).
In comparison with the light intensity of 600 mW/cm(2), the light intensity of 800 mW/cm(2) significantly increased the DC of dual-cured resin cement in the apical region. However, DC was not significantly different between 800 and 1100 mw/cm(2) light intensities. If the resin cement, especially in the apical areas is not sufficiently cured, microleakage might increase and post retention might be jeopardized. In comparison with 600 mW/cm(2) light intensity, 800 mW/cm(2) significantly increases DC at the apical third that might be clinically beneficial.
评估不同光强度对不同深度半透明纤维桩处双固化树脂水门汀固化转化率（DC）的影响。
将30根半透明纤维桩随机分为三组（n = 10）。使用Duo-Link双固化树脂水门汀将它们粘结在模拟根管空间中。水门汀分别在600、800和1100 mW/cm²的光强度下光固化40秒。使用傅里叶变换拉曼光谱仪的光谱计算树脂水门汀在颈部、中部和根尖三分之一处的DC。数据通过重复测量方差分析和Tukey事后检验进行分析（α = 0.05）。
在所有组中，根尖区域的DC最低。颈部和中部区域不同光强度下的DC无显著差异（p>0.05）。然而，在根尖区域，800和1100 mw/cm²的DC相似（p>0.05），但600 mW/cm²光强度下的DC更大（分别为p = 0.02和p<0.001）。
与600 mW/cm²的光强度相比，800 mW/cm²的光强度显著提高了根尖区域双固化树脂水门汀的DC。然而，800和1100 mw/cm²光强度之间的DC无显著差异。如果树脂水门汀，尤其是在根尖区域未充分固化，可能会增加微渗漏并危及桩的固位。与600 mW/cm²光强度相比，800 mW/cm²显著增加根尖三分之一处的DC，这在临床上可能是有益的。
