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Paqué, F; Luder, H U; Sener, B; Zehnder, M (2006). Tubular sclerosis rather than the smear layer impedes dye penetration into the dentine of endodontically instrumented root canals. International Endodontic Journal, 39(1):18-25.

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Abstract

AIM: To evaluate the effect of different root canal irrigating regimes on dentine penetration of Patent Blue dye. METHODOLOGY: Eighty extracted single-rooted human mandibular premolar teeth with narrow root canals were prepared using ProFile instruments. After each instrument, canals were irrigated with 1% sodium hypochlorite. Subsequently, teeth were randomly assigned to receive a 10 mL rinse of aqueous 17% (w/v) ethylenediaminetetraacetic acid or tap water for 2 or 10 min, followed by a final rinse with a 2% Patent Blue dye solution for 2 or 10 min (eight groups, n = 10 teeth per group). Teeth were then horizontally sectioned 3, 6 and 9 mm from the apex. Sections were digitally photographed and dye penetration was calculated as percentage of total dentine area using NIH Image J. Values were compared using one-way anova and Bonferroni correction with the alpha-type error set at <0.05. Representative tooth sections from all groups were further analysed using scanning electron microscopy. RESULTS: No significant impact of irrigating protocols on dye penetration was found. Dye penetration was significantly (P < 0.001) greater in the coronal than middle, and in middle than in apical root thirds. When observed microscopically, irrigant penetration was independent of the presence of a smear layer, but was rather a function of tubular sclerosis. CONCLUSIONS: Tubular sclerosis, a physiological phenomenon that starts in the third decade of life in the apical root region and advances coronally with age, was the main factor influencing penetrability of root dentine.

Item Type:Journal Article, refereed
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Preventive Dentistry, Periodontology and Cariology
DDC:610 Medicine & health
Language:English
Date:1 January 2006
Deposited On:11 Feb 2008 12:24
Last Modified:23 Nov 2012 14:38
Publisher:Wiley-Blackwell
ISSN:0143-2885
Publisher DOI:10.1111/j.1365-2591.2005.01042.x
Related URLs:http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-2591.2005.01042.x
PubMed ID:16409324
Citations:Google Scholar™

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