Influence of thermal effect on filling effect of bioceramic paste in different parts of root canal / 国际生物医学工程杂志

ABSTRACT

Objective:To study the effect of thermal effect on the filling effect of bioceramic paste combined with thermal gel gutta-percha vertical obturation method in different parts of root canal.Methods:Forty single-root canal teeth samples were randomly and randomized divided into the control group, the iRoot SP group, the 10 s group and the 20 s group. All tooth samples were root canal prepared to 0.04 taper after crown removal. The control group received AH-plus paste combined with thermal gel gutta-percha vertical obturation. The iRoot SP group received iRoot SP single-point filling. The 10 s group and 20 s group received iRoot SP single-point filling combined with thermal gel gutta-percha vertical obturation, in which the root canal of the two groups were heated at 180 °C for 10 s and 20 s, respectively, before using the thermosetting gutta-percha. Methylene blue staining, scanning electron microscope (SEM) observation and dental microscope observation were used to analyze the occurrence of gaps in the middle and upper segment of the root canal and the apical 1/3 of the root canal after filling.Results:For the filling in the apical 1/3 of the root canal, no obvious gap appeared in the 10 s group and the 20 s group, and there was no significant difference between the dye infection depth and the control group (all P>0.05). For the filling of the middle and upper segment of the root canal, the probability of porosity is higher when using iRoot SP combined with single-point filling. Conclusions:Short-term high temperature heating will not affect the sealing effect of iRoot SP on the apical 1/3 of the root canal. For the middle and upper segment of the root canal, the filling effect of iRoot SP single-point filling combined with thermal gel gutta-percha vertical obturation method is better than that of iRoot SP single-point filling.