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制作固定义齿基牙预备时,由于切割器械摩擦产生热刺激作用,并形成釉质创面。关于基牙预备时对牙髓和造牙本质细胞的影响已经有些报道.作者研究基牙预备时产生的热对釉质结构的影响.用大鼠作实验,月龄4～6月,体重200～300g。用硫喷要钠麻醉,模拟基牙预备,使大鼠下切牙均匀地加热到60℃,持续30秒,60秒,2分和3分钟。24小时以后用钳子咬下牙冠,放在2%戊二醛缓冲液中2.5小时(4℃),2%四氧化饿液固定,蔗糖液洗净,酒精和丙酮脱水,空气
Preparation of fixed denture abutment preparation, as a result of thermal friction cutting device friction and the formation of enamel wounds. There are some reports on the effect of the preparation of the abutment on the pulp and the dentin cells.We studied the effect of heat generated by the preparation of the abutment on the structure of the enamel.Using the rats for experiment from April to June and weighing 200 ~ 300g. Sodium anesthesia was performed with sodium thiosulfate to mimic the abutment preparation and the rat incisors were evenly heated to 60 ° C for 30 seconds, 60 seconds, 2 minutes and 3 minutes. Twenty-four hours later, the crown was bitten with forceps and placed in 2% glutaraldehyde buffer for 2.5 hours (4 ° C), fixed with 2% tetra-oxide, washed with sucrose, dehydrated with acetone and acetone,