Fukase Y, Saitoh M, Kaketani M, Ohashi M, Nishiyama M
Department of Dental Materials, Nihon University, School of Dentistry, Tokyo, Japan.
Dent Mater J. 1992 Dec;11(2):189-96. doi: 10.4012/dmj.11.189.
Thermal coefficients of four kinds of commercially available paste-paste type pulp capping cements were examined. Control reference samples were made of dentin. A thermal coefficient analyzer was used, heating specimens for a few nanoseconds by a xenon flash bulb and measuring thermal changes by using a thermocouple. Thermal coefficients were examined by this non-steady state method. Thermal conductivities of all cements were almost the same or lower than that of dentin. Therefore, when each cement was heated, the penetrating energy was almost the same or lower than that of dentin. The thickness of the cements was converted into that of the dentin by using the obtained thermal conductivity. The 1-mm thickness of the examined cements were equal to between 0.97-mm and 2.10-mm thicknesses of lost dentin. The use of a pulp capping cement provided better pulp protection from thermal stimuli than did the same thickness of dentin.
对四种市售膏体-膏体型牙髓盖髓水门汀的热系数进行了检测。对照参考样本由牙本质制成。使用热系数分析仪，通过氙闪光灯对样本加热几纳秒，并使用热电偶测量热变化。通过这种非稳态方法检测热系数。所有水门汀的热导率几乎与牙本质相同或低于牙本质。因此，当每种水门汀受热时，穿透能量几乎与牙本质相同或低于牙本质。利用所获得的热导率将水门汀的厚度换算为牙本质的厚度。所检测水门汀1毫米的厚度相当于牙本质缺失厚度在0.97毫米至2.10毫米之间。与相同厚度的牙本质相比，使用牙髓盖髓水门汀能更好地保护牙髓免受热刺激。
