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[Periapical microleakage of root canals filled with four kinds of sealers using two obturation techniques]
1Department of Special Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Objective:
To study the periapical microleakage of the root canals filled with four kinds of sealers using two obturation techniques.
Methods:
Sixty-four extracted first maxillary premolars were randomly divided into four groups. All the root canals were prepared with Protaper rotary instruments and filled with two obturation techniques: warm vertical condensation and cold lateral condensation. Four kinds of sealers included: Cortisomol, nano-zinc oxide, Apexit and calcium hydroxide which were individually used for four groups. After the teeth were dyed for 7 days with Indian ink, dyeing lines were measured with digital camera under steromicroscope to reflect the microleakage.
Results:
In cold lateral condensation groups, dyeing lines of calcium hydroxide group had an average length of (1.75+/-0.22) mm, which was significantly longer than that of Cortisomol group (1.40+/-0.15 mm) and nano-zinc oxide group [(1.56+/-0.25) mm, P<0.05], while that of Apexit group showed to be the shortest one [(1.26+/-0.21) mm, P<0.05]. Dyeing lines of each warm vertical condensation group showed similar length [(0.97+/-0.13) mm to (1.07+/-0.15) mm, P > 0.05], which were significantly shorter than that of cold lateral condensation groups (P<0.05).
Conclusion:
The gradients and dosage of sealers showed significant influences on periapical microleakage of root canals filled using cold lateral condensation technique. Warm vertical condensation technique could dramatically eliminate periapical micro-leakage of root canals, irrespective of the sealers used.
