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本研究的目的是用一种新的方法比较各种热塑牙胶充填技术根管壁与牙胶之间的密合情况。 材料和方法 选用159颗单根上颌离体牙,截去牙冠,确立工作长度为根尖孔内1mm处。所有根管用K-Hex锉以传统的逐步后退法进行根管预备,根管口用2~#或3~#的Largo钻扩大,根尖预备至比初尖锉大三号,并达工作长度,根管预备过程中用2.5％次氯酸钠和3％过氧化氢冲洗,经预备的根管随机分为9组,每
The purpose of this study was to compare the fit between the root canal wall and the gutta percha with a variety of thermoplastic gutta-percha filling techniques using a new method. Materials and Methods 159 single root maxillary teeth were selected, the crown was cut off, and the working length was set to 1mm at the apical foramen. All root canal preparation was performed with the traditional step-down method using a K-Hex file. The root orifice was expanded with Largo drills 2 ~ # or 3 ~ #, and the root tip was prepared to be larger than the first file Length, root canal preparation process with 2.5% sodium hypochlorite and 3% hydrogen peroxide rinse, the prepared root canal were randomly divided into 9 groups, each