Vallittu P K, Ruyter I E, Buykuilmaz S
Department of Prosthetic Dentistry, Institute of Dentistry, University of Turku, Finland.
Eur J Oral Sci. 1998 Feb;106(1):588-93. doi: 10.1046/j.0909-8836.1998.eos106109.x.
The aim of this study was to investigate the effect of polymerization time and polymerization temperature on the residual methyl methacrylate (MMA) content of two heat-cured and two autopolymerized denture base polymers. Gas chromatography was used to determine the residual MMA content of three test specimens of each type of polymer. Increasing the polymerization temperature for the autopolymerized denture base resins from 30 degrees C to 60 degrees C decreased the residual MMA content of the polymer from an average of 4.6 wt% to 3.3 wt%. With the heat-cured denture base resins, a curing cycle at a polymerization temperature of 70 degrees C followed by a period at 100 degrees C significantly reduced the residual monomer content of the polymer when compared with a resin cured at 70 degrees C only. Polymerizing the heat-cured denture base resin at 100 degrees C only for various lengths of time significantly affected the residual MMA content of the polymer. The lowest residual MMA content (0.07 wt%) was obtained by polymerizing the heat-cured denture base resin at 100 degrees C for 12 h. The results of this study suggest that the polymerization temperature and polymerization time considerably affect the residual MMA content of denture base polymers.
本研究的目的是调查聚合时间和聚合温度对两种热固化型和两种自凝型义齿基托聚合物中残留甲基丙烯酸甲酯（MMA）含量的影响。采用气相色谱法测定每种类型聚合物的三个测试样本的残留MMA含量。将自凝型义齿基托树脂的聚合温度从30℃提高到60℃，聚合物的残留MMA含量从平均4.6 wt%降至3.3 wt%。对于热固化型义齿基托树脂，与仅在70℃固化的树脂相比，在70℃的聚合温度下进行固化循环，随后在100℃保持一段时间，可显著降低聚合物的残留单体含量。仅在100℃将热固化型义齿基托树脂聚合不同时长，会显著影响聚合物的残留MMA含量。通过在100℃将热固化型义齿基托树脂聚合12小时，可获得最低的残留MMA含量（0.07 wt%）。本研究结果表明，聚合温度和聚合时间会显著影响义齿基托聚合物的残留MMA含量。
