Influence of apical preparation size and irrigation technique on root canal debridement: a histological analysis of round and oval root canals

Aim To examine the debridement of round and oval root canals prepared to two apical sizes with and without ultrasonically activated irrigation. Methodology Mandibular premolars with round (n = 48) and oval (n = 48) root canals were pair‐matched after microCT scanning and randomly divided into two ex...

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Bibliographic Details
Published in:International endodontic journal 2019-09, Vol.52 (9), p.1366-1376
Main Authors: Lee, O. Y. S., Khan, K., Li, K. Y., Shetty, H., Abiad, R. S., Cheung, G. S. P., Neelakantan, P.
Format: Article
Language:English
Subjects:
apical size
Computed tomography
Cross-Sectional Studies
Debridement
Dental pulp
Dental Pulp Cavity
Endodontics
Humans
Lavage
Mandible
nickel titanium
Premolars
pulp tissue
Root Canal Irrigants
Root Canal Preparation
Root canals
rotary
ultrasonic
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Summary:Aim To examine the debridement of round and oval root canals prepared to two apical sizes with and without ultrasonically activated irrigation. Methodology Mandibular premolars with round (n = 48) and oval (n = 48) root canals were pair‐matched after microCT scanning and randomly divided into two experimental groups (n = 20): group 1, rotary NiTi to size 20, .04 taper; group 2, rotary NiTi to size 40, .04 taper. Specimens were subdivided into two subgroups (n = 10): subgroup A, syringe and needle (SNI); subgroup B, ultrasonically activated irrigation (UAI). Untreated canals (eight oval and eight round) served as controls. Specimens were processed for histological evaluation for measurement of the remaining pulp tissue and debris (RPT), and the perimeter percentage of root canal area untouched by the instruments (PRAU). Following assessment of normality, multiple‐way anova models were used to study the effects of preparation size, irrigation technique and canal cross‐sectional shape, and their interactions on the RPT and PRAU (α = 0.05). Results All experimental groups had significantly less RPT than the control (P 
ISSN:0143-2885
1365-2591
DOI:10.1111/iej.13127