Effects of different tapered gutta-percha cones with cold lateral condensation technique on apical seal

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A nickel-titanium instrument with big taper angle is gradually applied in clinic due to its excellent taper angle and appearance. However, it is poorly understood whether greater tapered gutta-percha cones has good effect on apical seal.


To verify the effect of gutta-percha cone with different tapered angles on apical area sealing.


A comparison observation experiment was performed at the Department of Stomatology and Center Laboratory of People's Hospital of Peking University from December 2008 to February 2009.


Thirty-one extracted the first maxillary premolars teeth with completed root formation were collected.


Thirty teeth were randomly divided into 0.02 tapered angle (n=10), 0.04 tapered (n=10) angle 0.06 tapered angle (n=10) groups after MTWO preparation, which was filled with three different master cones and obturated with cold lateral condensation. The remained tooth was served as control group.


The apical leakage was evaluated by the linear measurement combined with transparent specimen method, and the ability of apical seal was measured.


The dye penetration of positive control group was along the whole canals. The length of penetration were (1.655±0.426) mm, (1.210±0.367) mm and (1.100±0.462) mm in 0.02 tapered angle, 0.04 tapered angle and 0.06 tapered angle groups, respectively. The apical sealing ability of 0.04 tapered angle group and 0.04 tapered angle group had no significant difference (P > 0.05). While the length of penetration had statistical differences between 0.02 tapered angle group and 0.06 tapered angle group (P < 0.05) or 0.02 tapered angle group and 0.06 tapered angle group (P < 0.05).


Better apical seal can be obtained when using the big cones and obturated with cold lateral condensation after MTWO treatment.

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