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Impact of cross‐sectional root canal shape on filled canal volume and remaining root filling material after retreatment
Author(s) -
Rechenberg D.K.,
Paqué F.
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.12027
Subject(s) - molar , root canal , dentistry , orthodontics , gutta percha , mandibular second molar , medicine
Aim To assess the impact of cross‐sectional root canal shape ( CSRCS ) on the canal volume that can be filled and the root filling material that remains following a subsequent retreatment procedure. Methodology A total of 15 extracted two‐rooted human maxillary premolars and 15 mandibular first molars were used. Both root canals in the premolars ( N = 30) and the distal root canal in the molars ( N = 15) were prepared using P ro F ile instruments and filled by lateral compaction using gutta‐percha and AH Plus sealer. Canals were later retreated using the last P ro F ile used for instrumentation followed by two P ro F iles of increasing size. Teeth were viewed in a μ CT scanner before and after each treatment step. Defined and validated threshold levels were used to differentiate empty root canal volumes, root dentine and root filling materials from each other. CSRCS was defined as the averaged ratio between bucco‐lingual and mesio‐distal canal diameter (round ≤ 1, oval 1–2, long oval 2–4 and flattened ≥ 4), determined for each 1 mm over the total root length. Data were averaged between the two canals in premolars, only the distal canals were assessed in molars. Parametric and non‐parametric tests were used to statistically compare the data, alpha = 0.01. Results Canals in premolars had a round CSRCS after preparation (1.0 ± 0.0), whereas distal counterparts in molars were oval (1.6 ± 0.5). Significantly ( P < 0.01) more canal volume could be filled, and significantly less filling material remained after retreatment in premolars compared with mandibular molar distal canals. There was a high correlation between CSRCS , filled canal volume and remaining filling material. Conclusions The endodontic procedures under investigation were significantly influenced by the cross‐sectional root canal shape.