TY - JOUR
T1 - Micro-computed tomography evaluation of root canal filling quality with apical negative pressure
AU - Li, Jinxia
AU - Bergeron, Brian E.
AU - Chao, Jing
AU - Xu, Ting
AU - Tay, Franklin R.
AU - Fan, Bing
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China [grant number 81771067 ]. The authors graciously acknowledged Guilin Woodpecker Medical Instrument Co. Ltd., Guilin, China for preparing the prototype of the negative pressure root canal filling device used in this work.
Publisher Copyright:
© 2020
PY - 2020/9
Y1 - 2020/9
N2 - Objectives: The objective of the present study was to compare, using micro-computed tomography (micro-CT), the location and volume percentage of voids in root canals that were obturated with a premixed tricalcium silicate sealer and a single gutta-percha master cone, in the presence or absence of apical negative pressure. Methods: Twenty extracted human mandibular premolars were cleaned and shaped. The teeth were assigned to 2 groups (n = 10) according to the filling technique: apical negative pressure sealer application combined with the single-cone technique (NPS) or syringe-assisted sealer application combined with the single-cone technique (SS). Each specimen was scanned using micro-CT at 10 μm resolution. The percentages of voids were calculated from segmental regions of interest. Data were analysed using nonparametric statistical methods, with statistical significance pre-set at α = 0.05. Results: Significant difference was identified (p < 0.05) in the overall percentage of voids between the NPS group (0.33 %; interquartile range 0.25 %) and the SS group (6.29 %; interquartile range 5.57 %). In the NPS group, the percentages of voids in the coronal-third or middle-third of the canal space were statistically lower than that in apical-third (p < 0.0167, Bonferroni adjustment), with no significant difference between the former two groups. In the SS group, no significant difference in the percentages of voids was identified among the coronal-third, middle-third and apical-third of the canal space. Conclusions: Apical negative pressure sealer application combined with the single-cone technique produces fewer voids in root canal fillings than the conventional single-cone technique. Clinical significance: The apical negative pressure sealer application technique combined with single-cone filling constitutes a novel root canal obturation technique that improves the quality of root canal filling by minimising the volume of voids within the three-dimensional canal space.
AB - Objectives: The objective of the present study was to compare, using micro-computed tomography (micro-CT), the location and volume percentage of voids in root canals that were obturated with a premixed tricalcium silicate sealer and a single gutta-percha master cone, in the presence or absence of apical negative pressure. Methods: Twenty extracted human mandibular premolars were cleaned and shaped. The teeth were assigned to 2 groups (n = 10) according to the filling technique: apical negative pressure sealer application combined with the single-cone technique (NPS) or syringe-assisted sealer application combined with the single-cone technique (SS). Each specimen was scanned using micro-CT at 10 μm resolution. The percentages of voids were calculated from segmental regions of interest. Data were analysed using nonparametric statistical methods, with statistical significance pre-set at α = 0.05. Results: Significant difference was identified (p < 0.05) in the overall percentage of voids between the NPS group (0.33 %; interquartile range 0.25 %) and the SS group (6.29 %; interquartile range 5.57 %). In the NPS group, the percentages of voids in the coronal-third or middle-third of the canal space were statistically lower than that in apical-third (p < 0.0167, Bonferroni adjustment), with no significant difference between the former two groups. In the SS group, no significant difference in the percentages of voids was identified among the coronal-third, middle-third and apical-third of the canal space. Conclusions: Apical negative pressure sealer application combined with the single-cone technique produces fewer voids in root canal fillings than the conventional single-cone technique. Clinical significance: The apical negative pressure sealer application technique combined with single-cone filling constitutes a novel root canal obturation technique that improves the quality of root canal filling by minimising the volume of voids within the three-dimensional canal space.
KW - Apical negative pressure
KW - Micro-CT
KW - Root canal filling
KW - Single-cone technique
KW - Tricalcium silicate sealer
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U2 - 10.1016/j.jdent.2020.103431
DO - 10.1016/j.jdent.2020.103431
M3 - Article
C2 - 32682921
AN - SCOPUS:85088866308
SN - 0300-5712
VL - 100
JO - Journal of Dentistry
JF - Journal of Dentistry
M1 - 103431
ER -