[Effect of post space preparation on the sealability of root canal filled with 3 filling methods].
OBJECTIVE
To evaluate the effect of post space preparation on the sealability of canals filled with 3 filling methods.


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.


RESULTS
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).


CONCLUSIONS
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.
Li
Jin-hua
JH
Department of Prosthodontics, Hangzhou First People's Hospital, Hangzhou 310006, China. jinhuali@tom.com
Ma
Chang-bai
CB
Zhang
Xiong
X
Zhu
Guo-qing
GQ
Chen
Jian-ping
JP
Tang
Xiu-chun
XC
D003763:Dental Leakage; D003786:Dental Pulp Cavity; D004129:Dimethylpolysiloxanes; D004338:Drug Combinations; D004853:Epoxy Resins; D006171:Gutta-Percha; D006801:Humans; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation; D018915:Root Canal Preparation; D012390:Root Canal Therapy; D015035:Zinc Oxide-Eugenol Cement
D004129:Dimethylpolysiloxanes; D004338:Drug Combinations; D004853:Epoxy Resins; C515718:GuttaFlow; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C112894:canals sealer; D006171:Gutta-Percha