Radix entomolaris in the mandibular molar teeth of an Iranian population

Kuzekanani, Maryam, Walsh, Laurence J., Haghani, Jahangir and Kermani, Ali Zeynali (2017) Radix entomolaris in the mandibular molar teeth of an Iranian population. International Journal of Dentistry, 2017 9364963. doi:10.1155/2017/9364963


Author Kuzekanani, Maryam
Walsh, Laurence J.
Haghani, Jahangir
Kermani, Ali Zeynali
Title Radix entomolaris in the mandibular molar teeth of an Iranian population
Journal name International Journal of Dentistry   Check publisher's open access policy
ISSN 1687-8736
1687-8728
Publication date 2017-03-01
Sub-type Article (original research)
DOI 10.1155/2017/9364963
Open Access Status DOI
Volume 2017
Start page 9364963
Total pages 5
Place of publication New York, NY, United States
Publisher Hindawi
Language eng
Subject 3500 Dentistry
Abstract Purpose. Supernumerary roots in permanent mandibular molar teeth make endodontic treatment more complicated. The aim of this study was to determine the prevalence of Radix Entomolaris (RE) in permanent mandibular first and second molars in the population of Kerman, in the southeast of Iran. Materials and Methods. From a collection of 500 mandibular first and second molar teeth extracted over 2015-2016 at dental clinics in Kerman, teeth were scored for an additional distolingual root, and the average root length and root morphology of this extra root were determined using the De Moor classification scheme. Results. In this population, RE occurred in 6% of mandibular first molars (4% with a straight apex (Type I) and 2% with buccal apical curvature (Type III)). In all cases, RE was the shortest root, with an average root length of 18.37 mm. RE occurred in only 0.8% of mandibular second molars, with an average root length of 18.0 mm. All mandibular second molars with RE were of Type III. Fisher's exact test showed that the difference in frequency between first and second molars was statistically significant (two-sided P=0.002). Conclusion. Radix Entomolaris occurs more frequently in mandibular first molars than in mandibular second molars in this sample of 500 mandibular molars. The reported rate of 6% in first molars is expected to be higher than reported rates in European or Caucasian populations where the prevalence is typically less than 2%.
Formatted abstract
Purpose: Supernumerary roots in permanent mandibular molar teeth make endodontic treatment more complicated. The aim of this study was to determine the prevalence of Radix Entomolaris (RE) in permanent mandibular first and second molars in the population of Kerman, in the southeast of Iran.

Materials and Methods: From a collection of 500 mandibular first and second molar teeth extracted over 2015-2016 at dental clinics in Kerman, teeth were scored for an additional distolingual root, and the average root length and root morphology of this extra root were determined using the De Moor classification scheme.

Results: In this population, RE occurred in 6% of mandibular first molars (4% with a straight apex (Type I) and 2% with buccal apical curvature (Type III)). In all cases, RE was the shortest root, with an average root length of 18.37 mm. RE occurred in only 0.8% of mandibular second molars, with an average root length of 18.0 mm. All mandibular second molars with RE were of Type III. Fisher's exact test showed that the difference in frequency between first and second molars was statistically significant (two-sided P=0.002).

Conclusion: Radix Entomolaris occurs more frequently in mandibular first molars than in mandibular second molars in this sample of 500 mandibular molars. The reported rate of 6% in first molars is expected to be higher than reported rates in European or Caucasian populations where the prevalence is typically less than 2%.
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Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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