Li Jin-hua, Ma Chang-bai, Zhang Xiong, Zhu Guo-qing, Chen Jian-ping, Tang Xiu-chun
Department of Prosthodontics, Hangzhou First People's Hospital, Hangzhou 310006, China.
Shanghai Kou Qiang Yi Xue. 2009 Dec;18(6):639-42.
To evaluate the effect of post space preparation on the sealability of canals filled with 3 filling methods.
The crowns of 24 human anterior teeth extracted for periodontal disease were removed and the working length of canal was unified to be 16 mm. The teeth were divided into 3 groups at random: group A (normal temperature flow gutta-percha single-corn technique with GuttaFlow), group B (lateral compaction technique with AH Plus) and group C (warm vertical condensation technique with AH Plus+ BeeFill thermoplastics system). The root canals were prepared and filled according to different system. Microleakage of root canals of pre-post space preparation was measured with a fluid transport study one week after filling. Then the post space was prepared using 1#- 6# G drill step by step, by leaving 4 mm of root canal filling material apically. Microleakage of root canals of post-dowel space preparation was measured again. SPSS13.0 software package was used for statistical analysis.
No difference was found between pre-post space preparation and post-dowel space preparation in each experimental group (P>0.05). In pre-post space preparation, significant difference was found between group A and group B, group B and group C (P<0.05). In post-dowel space preparation, difference was found between group A and group B.Group A had the lowest microleakage (4.328+/-2.020)x10(-3)microl x kPa(-1) x min(-1).
The post space preparation do not effect the sealability of three root canal sealers. The sealability of canals filled with AH Plus are different when filled with different filling methods. Normal temperature flow gutta-percha single-corn technique with GuttaFlow gains the best sealability.
评估桩道预备对采用三种充填方法充填根管封闭性的影响。
选取24颗因牙周病拔除的人前牙，截除冠部，将根管工作长度统一为16mm。随机分为3组：A组（GuttaFlow常温流动牙胶单尖法）、B组（AH Plus侧方加压法）和C组（AH Plus+BeeFill热塑系统热垂直加压法）。根据不同系统预备并充填根管。充填1周后，采用液体渗透法测量桩道预备前后根管的微渗漏。然后用1#-6#G钻逐步预备桩道，根尖保留4mm根管充填材料，再次测量桩道预备后根管的微渗漏。采用SPSS13.0软件包进行统计学分析。
各试验组桩道预备前后与桩道预备后微渗漏差异无统计学意义（P>0.05）。桩道预备前，A组与B组、B组与C组差异有统计学意义（P<0.05）。桩道预备后，A组与B组差异有统计学意义。A组微渗漏最低，为(4.328±2.020)x10(-3)微升x千帕(-1)x分钟(-1)。
桩道预备不影响三种根管封闭剂的封闭性。采用不同充填方法时，AH Plus充填的根管封闭性不同。GuttaFlow常温流动牙胶单尖法封闭性最佳。
