The purpose of this study was to assess the efficacy of desocclusol, eucalyptol and d-limonene on removal of gutta-percha, their effect on microhardness of dentin, and the antibacterial properties against Enterococcus faecalis (E. faecalis) during root canal retreatment.
Forty single-canal roots, obturated with gutta-percha, were prepared and randomly divided into 4 groups (n=10). Group that free of any solvent was control group. Three of experimental groups were exposed to desocclusol, eucalyptol and d-limonene respectively during endodontic retreatment. Efficacy of each solvent was assessed by comparation of time duration, amount of apical extrusion and residual debris in the root canals. Vickers microhardness of each sample was recorded. Antibacterial activity on E. faecalis was also observed. The data were subjected to repeated statistical analysis.
All three organic solvents were found to be effective in the removal of root canal filling material compared with control group (p<0.05). D-limonene was more effective in significantly increasing the microhardness of dentin compared with desocclusol, which decreased the microhardness of root canal dentin (p<0.05). In the meantime, d-limonene had a stronger antibacterial activity than eucalyptol, while desocclusol had no obvious bacterial inhibition.
These three organic solvents are all effective in removing gutta-percha in endodontic retreatment. D-limonene can increase the microhardness of dentin and has a stronger inhibitory effect on E. faecalis than desocclusol and eucalyptol.
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