微波对离体牙髓腔温度的影响

Effects of Microwave Power on Temperature Change in Dental Pulpal Chamber in vitro

目的研究不同功率、不同作用时间的微波直接作用和通过氟化钠甘油糊剂作用于磨损程度不同的离体牙面时髓腔内温度的变化,为临床使用微波加氟化钠治疗牙本质过敏症提供参考资料。方法将完整的离体人恒磨牙面制成轻、中、重度3种不同的磨损程度,用不同功率、不同作用时间的微波直接作用及通过氟化钠甘油糊剂作用于离体牙面,测量髓腔内温度变化值。结果微波作用时随作用时间延长、功率升高,髓腔内温度上升,牙齿磨损程度重者温度上升幅度大。相同时间、相同功率作用于相同磨损牙面,通过75%氟化钠甘油糊剂作用较直接作用髓腔温度上升幅度大(P<0.01)。结论微波功率和作用时间以及牙齿磨损程度对髓腔温度均有直接影响;临床应用时应根据牙磨损程度,谨慎选择微波能量和作用时间。

Objective To explore the effects of microwave powers on temperature changes of dental pulpal chamber in vitro.Methods 96 isolated teeth were prepared in three degrees of dental occlusal wear according to Smith BG′s report. Temperature change values in dental pulpal chamber were recorded by thermometer (DM 6801A) while the different affect time and microwave powers acted directly and with 75% sodium fluoride glycerine paste on face of isolated teeth separately in room temperature.Results The degree of temperature in dental pulpal chamber was going up follow the raising microwave power and prolonging time. The temperature in dental pulpal chamber with microwave acting sodium fluoride on dental occlusal was higher than acting directly dental occlusal.Conclusion The microwave power, time and degree of dental occlusal wear are very important factors on temperature change in dental pulpal chamber in our study.