Abstract
Introduction
The purpose of this study was to examine the frequency and bilateral consistency of
distolingual roots (DLRs) in permanent mandibular first molars (PMFMs) and root canal
configurations in PMFPs (permanent mandibular first premolars) and to determine the
correlation between the root canal configurations of PMFPs with the appearance of
DLRs in PMFMs.
Methods
A total of 932 cone-beam computed tomographic images of PMFMs and PMFPs were collected
from 233 patients. The frequency and bilateral consistency of DLRs in PMFMs along
with root canal configurations (root number and canal number) of PMFPs were recorded
and evaluated ipsilaterally and contralaterally. Multivariable logistic regression
analysis was used to evaluate the correlation between the root canal configurations
of PMFPs with the appearance of DLRs in PMFMs.
Results
The prevalence of PMFMs with DLRs was 24.7%, and the incidence of complicated root
canal configurations of PMFPs was 26.6%. The incidence of complicated root canal configurations
of PMFPs was 19.6% in the non-DLR group, 37.2% in the unilateral DLR group, and 44.7%
in the bilateral DLR group. After adjusting for categoric variables including sex,
age, and side, the odds ratios for the frequency of complicated root canal configurations
of PMFPs in the unilateral DLR and bilateral DLR groups compared with the non-DLR
group were 2.472 (95% confidence interval, 1.434–4.263; P = .001) and 3.392 (95% confidence interval, 1.976–5.823; P < .001), respectively.
Conclusions
An increasing and corresponding trend between the presence of DLRs in PMFMs and complicated
root canal configurations in PMFPs was noted in Taiwanese individuals. These results
suggest that the clinicians should familiarize themselves with the anatomic variants
of PMFMs and PMFPs before endodontic treatment.
Key Words
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Publication history
Published online: April 14, 2017
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- CorrigendumJournal of EndodonticsVol. 44Issue 3
