暂时冠桥修复材料聚合过程中髓腔内温度变化的体外研究

In vitro intrapulpal temperature changes during the polymerization of provisional crown and bridge materials

目的:体外测量6种暂时冠桥修复材料直接法制作暂时修复体时牙髓腔内温度的变化。方法:选取1个健康的人离体下颌第三磨牙,标准全冠预备后,将一热电偶置入髓腔,另一端与一电子温度计相连,将4种Bis-acryl复合树脂(Protemp3Garant、Luxatemp、ProtempⅡ和Fast-Temp)和2种聚甲基丙烯酸甲酯树脂(Quick Resin和Curefast)分别按照使用说明混合后,填入预先准备的硅橡胶印模中,在基牙上复位,记录实验材料聚合过程中髓腔内的温度变化。结果:ProtempⅡ组髓腔最大升温值(3.8℃)低于Protemp3Garant组(4.6℃)、Luxatemp组(4.8℃)和Fast-Temp组(4.8℃),有显著性差异(P<0.05),后三组之间无显著性差异(P>0.05)。4种Bis-acryl复合树脂最大升温值又显著低于QuickResin组(9.1℃)和Curefast组(8.7℃)(P<0.05),QuickResin和Curefast之间无显著性差异(P>0.05)。结论:4种Bis-acryl复合树脂聚合过程中髓腔升温低于两种聚甲基丙烯酸甲酯树脂,适合直接法制作暂时修复体。

AIM：To compare the temperatures changes in the pulpal chamber during fabrication of provisional restoration by direct method with six provisional crown and bridge materials.METHODS：An extracted human mandibular molar was prepared for a complete crown restoration.The tip of a thermocouple connected to a digital thermometer was positioned into the pulp chamber.Four bis-acryl composites（Protemp 3 Garant,Luxatemp,Protemp II and Fast-Temp） and two polymethyl methacrylates（QuickResin and Curefast） were mixed seperalely according to manufacturer＇s instructions.After the resin mixture was placed into a polyvinyl siloxane impression template and then positioned on the prepared molar tooth.The temperature change in the pulpal chamber during the polymerization of provisional resinous materials was recorded.RESULTS：The maximum intrapulpal temperature increase of Protemp II（3.8℃） was lower than those of the Protemp 3 Garant（4.6℃）,Luxatemp（4.8℃） and Fast-Temp（4.8℃）（P〈0.05）.The four bis-acryl composites had lower temperature increases than the QuickResin（9.1℃） and Curefast（8.7℃）（P〈0.05）.However,no significant difference was observed among Protemp 3 Garant,Luxatemp and Fast-Temp（P〉0.05）.So did between QuickResin and Curefast（P〉0.05）.CONCLUSIONS：The four bis-acryl composites cause lower intrapulpal temperature increases than the two polymethyl methacrylates,which made them preferable for fabrication of provisional restoration by a direct method.