Impact of thio-urethane additive and filler type on light-transmission and depth of polymerization of dental composites.
Impact of thio-urethane additive and filler type on light-transmission and depth of polymerization of dental composites.
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DOI：
10.1016/j.dental.2017.07.020
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发表时间：
2017-11
期刊：
影响因子：
--
通讯作者：
Pfeifer CS
中科院分区：
文献类型：
--
作者：
Faria-E-Silva AL;Pfeifer CS
研究了填料类型和硫氨基聚氨酯低聚物的加入对树脂复合材料透光性、聚合动力学和固化深度的影响。BisGMA:UDMA:TEGMA （5:3:2 wt%）与0（对照）或20 wt%的硫脲混合。包括不同尺寸和折射率的填料，并测量折射率。未填充树脂作为对照。测定了聚合前后材料的RIs。在聚合过程中测量了3 mm厚样品到达底部的辐照度。将转换程度映射到5毫米的深度。利用光学台架同时跟踪转换和光传输。硫氨基脲的加入提高了所有复合材料的RI。正如预期的那样，RI也随着所有材料的转化而增加。唯一的例外是填充了OX-50的材料，其中复合材料的RI随着转化而降低。在这种情况下，3mm样品底部的辐照度也是所有组中最低的。硫代氨基乙烷的加入对填料类型内的光透射只有很小的影响，但导致所有基团的深度转换增加。填料类型本身对透光性有较大的影响，且与转换度相关。添加硫脲对深度转化率的影响与填料类型有关。可以定制添加剂以改善与填料的RI匹配，以优化牙科复合材料中的光传输。
This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. BisGMA:UDMA:TEGMA (5:3:2 wt%) were mixed with 0 (control) or 20 wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization. The irradiance reaching the bottom of 3-mm thick specimens was measured during the polymerization. Degree of conversion to a depth of 5 mm was mapped. An optical bench was used to simultaneously follow conversion and light transmission. The addition of thio-urethane increased the RI for all composites. As expected, RI also increased with conversion for all materials. The one exception was for the material filled with OX-50, in which the RI of the composite decreased with conversion. In this case, the irradiance at the bottom of the 3 mm specimen was also the lowest among all groups. The addition of thio-utethanes had only minimal effect on light transmission within a filler type, but led to increased conversion in depth for all groups. The filler type itself had a greater effect on light transmission, and that correlated well with the degree of conversion. The effect of the Thio-urethane addition on degree of conversion in depth was dependent on filler type. The additive can be tailored to improve the RI match with the filler to optimize light transmission in dental composites.
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影响因子：
9.7
作者：
Howard, Benjamin;Wilson, Nicholas D.;Newman, Sheldon M.;Pfeifer, Carmem S.;Stansbury, Jeffrey W.
通讯作者：
Stansbury, Jeffrey W.
影响因子：
5
作者：
Bacchi, Atais;Pfeifer, Carmem S.
通讯作者：
Pfeifer, Carmem S.
影响因子：
5
作者：
Alshali, Ruwaida Z.;Salim, Nesreen A.;Silikas, Nick
通讯作者：
Silikas, Nick
影响因子：
5
作者：
dos Santos, G. B.;Alto, R. V. Monte;Fellows, C. E.
通讯作者：
Fellows, C. E.
DOI：
10.1016/j.dental.2015.02.008
发表时间：
2015-05
期刊：
Dental materials : official publication of the Academy of Dental Materials
影响因子：
--
作者：
Bacchi A;Consani RL;Martim GC;Pfeifer CS
通讯作者：
Pfeifer CS