S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
Incidence of three roots and/or four root canals in the permanent mandibular first molars in a Korean sub-population
- Jang, Ju-Kyong; Peters, Ove A.; Lee, WooCheol; Son, Sung-Ae; Park, Jeong-Kil; Kim, Hyeon-Cheol
- Issue Date
- CLINICAL ORAL INVESTIGATIONS Vol.17 No.1, pp. 105-111
- 의약학; CBCT; Distolingual canal; Distolingual root; Inter-orifice distance; Radix entomolaris; Three-rooted
- Objectives The purpose of this study was to evaluate the
prevalence of three-rooted permanent mandibular first
molars (PMFMs) with four canals and their morphological
characteristics among a Korean population from using conebeam
computed tomography scans (CBCTs).
Materials and methods Among the 705 CBCTs screened,
472 patient cases possessing at least one PMFM were identified.
A total of 780 PMFMs were evaluated in axial section
series to determine the number of roots and canals. The
incidences of three-rooted PMFMs were compared with
regard to gender and location. For distal root(s) with two
canals, inter-orifice distances (IOD) between distobuccal
and distolingual canals were measured at pulpal floor and
furcation levels. The difference of IOD between males and
females was also analyzed using chi-square tests.
Results Among the 472 CBCTs of 225 females and 247
males, 84 females and 107 males were found to have at
least one three-rooted PMFM. Among the 780 PMFMs, 191 PMFMs (24.5%, 89 of 397 left and 102 of 383 right) were
found to have three roots. The prevalence of distal root(s)
with two canals was 34.2% (267 of 780). From the molars
with two distal canals, the mean IOD between distobuccal
and distolingual canals at the pulpal floor level was 3.1 mm
in males and 2.9 mm in females (p00.0428).
Conclusions The occurrence of three-rooted PMFMs
among a Korean population was 24.5% and was higher than
other countries and ethnicities. Understanding the prevalence
of PMFMs with a distolingual root and/or canal in a
Korean population and the IOD between distobuccal and
distolingual canals may be useful for successful endodontic
Clinical relevance Acknowledgment of potential incidence
of three-rooted permanent mandibular first molars with four
canals and the distance between two distal canals may
increase the success rate of root canal treatment by reducing
the missing canal untreated.
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