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Apically extruded debris and irrigant with two N i‐ T i systems and hand files when removing root fillings: a laboratory study
Author(s) -
Lu Y.,
Wang R.,
Zhang L.,
Li H. L.,
Zheng Q. H.,
Zhou X. D.,
Huang D. M.
Publication year - 2013
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12104
Subject(s) - root canal , dentistry , debris , agar gel , materials science , gutta percha , orthodontics , medicine , physics , biology , microbiology and biotechnology , meteorology
Abstract Aim To compare the amount of apically extruded debris and irrigant produced by two N i‐ T i instruments and hand files when removing root fillings, and to compare two experimental models. Methodology Sixty single straight root canals in human mandibular premolars were prepared with K ‐files and filled with gutta‐percha and AH Plus sealer. The teeth were randomly divided into three groups of 20 for removal of the root filling material with Reciproc files (Group 1, RP ), Mtwo retreatment files (Group 2, MR ) or hand files (Group 3, H). Each group was then equally divided into experimental subgroups: A, with 1.5% agar gel model ( AG ); B, with empty tube model ( ET ). Apically extruded debris and irrigant was quantified by subtracting the initial weight of the test apparatus without a tooth from its weight after the root canal retreatment. Comparative analysis of the amount of apically extruded debris and irrigant for each of the instruments and the experimental models was performed. Time for gutta‐percha removal was recorded. Data were statistically analysed using one‐way analysis of variance. Results Removal of root fillings with two N i‐ T i instruments produced less apically extruded debris and irrigant than hand files in both experimental models ( P < 0.05). More apically extruded debris and irrigant was produced with Reciproc files than Mtwo retreatment files using the 1.5% agar gel model ( P > 0.05). Significantly more apically extruded debris and irrigant was produced with R eciproc files than Mtwo retreatment files using the empty tube model ( P < 0.05). The time required to remove the root fillings followed R eciproc