Influence of four kinds of temporary fillings on coronal microleakage of endodontically treated teeth

Zhang Run-zhen; Xia Rong; Ji Zhang-zhang

doi:10.3969/j.issn.2095-4344

Abstract：BACKGROUND:The teeth that need to do the root canal treatment mostly have large dental defects which are even residual crown and residual root, but it takes a long time for completing the permanent restoration after treatment. So the temporary filings are important for sealing coronal microleakage after root canal treatment. <br> OBJECTIVE:To evaluate the influence of temporary filing materials on coronal microleakage of endodonticaly treated teeth and to discuss the influence of time on the sealing ability of coronal temporary filings. <br> METHODS: Totaly 126 extracted teeth were colected, and divided into experimental group (n=120), positive control group (n=3) and negative control group (n=3). Root canal treatment was done in the experimental and positive control groups, and then the experimental group was subdivided into four groups in which, Coltosol, Caviton, ZOE, Ceivitron were used as temporary filing materials, respectively. In the positive control group, there was no filing material. The teeth in the negative control group maintained intact. The microleakage of samples was observed at 1, 2, 4 weeks after temporary sealing. <br> RESULTS AND CONCLUSION: There was no dye in the root canal of the negative control group, but the whole root canal in the positive control group was stained. At 1 week after sealing, the microleakage lengths of the Coltosol and Caviton groups were significantly shorter than those of the ZOE and Ceivitron groups (P < 0.05). At 2 weeks after sealing, the microleakage length of the Coltosol group was significantly shorter than that of the Ceivitron group (P < 0.05). At 4 weeks after sealing, the microleakage lengths of the Coltosol, Caviton and ZOE were significantly shorter than that of the Ceivitron group (P < 0.05). with the extension of sealing time, the microleakage lengths of the four subgroups were al increased, and there were significant differences in each group at different time points (P < 0.05). These findings indicate that Coltosol and Caviton are the best as the temporary filing materials, folowed by ZOE, and Ceivitron is the worst. The optimum time of temporary sealing is 1-2 weeks for Coltosol and Caviton, and 1 week for ZOE and Ceivitron.