2010 Volume 53 Issue 3 Pages 304-308
A cotton pellet soaked with a disinfectant solution under hydraulic sealing cement is expected to maintain aseptic conditions in the pulp chamber during root canal treatment. However, a disinfectant solution might hinder the setting of the hydraulic sealing cement. A soft cement is likely to be worn and consequently collapse, and leakage will cause contamination of the pulp chamber. The aim of this study was to examine the effect of disinfectant solutions on the setting of hydraulic sealing cement. One hundred pulp chamber models were made with polyethylene terephthalate tubing. Fifty of them were filled with hydraulic sealing cement (Caviton®, GC). The remainder were divided into five groups and each model was filled with a cotton pellet soaked with one of the following; Group A: 6% sodium hypochlorite (Jiaen 6% "Yoshida", Yoshida Pharmaceutical), Group B: 83% ethanol and 3.7% isopropanol (Medialcotto ME-S, Hakujuji), Group C: Calcium hydroxide (Calcipex® II, Nippon Shika Yakuhin Kogyo), Group D: Distilled water, and Group E: no solution as the control. For Group C, calcium hydroxide was sealed without a cotton pellet. Each was joined to a tube filled with Caviton® and covered with utility wax except for the surface of Caviton®. They were kept in 37℃ water for 3 days. The surfaces of Caviton® were polished with water-resident paper #2,000. The penetration depth of the measurement needle from the surface to the test material was measured by a texture analyzer (EZ-TEST, Shimadzu). Statistical analysis was performed using a one-way ANOVA and Tukey-Kramer test with 0.05 confidence. The penetration depth of Groups C and E were significantly longer than Group D. There were no statistically significant differences among A, B and D. The results suggested that a cotton pellet soaked with 6% sodium hypochlorite, 83% ethanol or distilled water in the pulp chamber may increase the setting of Caviton® in the deep layer compared with a dry one.
