| Title |
Worldwide Prevalence of a Lingual Canal in Mandibular Premolars: A Multicenter Cross-sectional Study with Meta-analysis |
| Authors |
Martins, J.N.R., Department of Endodontics, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal, Instituto de Implantologia, Lisbon, Portugal; Zhang, Y., Department of Conservative Dentistry and Endodontics, School of Stomatology, Nanjing Medical University, Nanjing, China; von Zuben, M., Private Practice, Brussels, Belgium; Vargas, W., Instituto de Estudios Avanzados en Odontología Dr. Yury Kuttler, Mexico City, Mexico; Seedat, H.C., Private Practice, Durban, South Africa; Santiago, F., Private Practice, Paris, France; Aguilar, R.R., Department of Endodontics, Escuela Nacional de Estudios Superiores Universidade Nacional Autônoma do México, León, Mexico; Ragnarsson, M.F., Private Practice, Hafnarfjördur, Iceland; Plotino, G., Private Practice, Rome, Italy; Parashos, P., Melbourne Dental School, University of Melbourne, Melbourne, Australia; Ounsi, H.F., Department of Restorative Dentistry and Endodontics, Lebanese University, Beirut, Lebanon, Department of Endodontics and Restorative Dentistry, Siena University, Siena, Italy; Nole, C., Private Practice, Lima, Peru; Monroe, A., Private Practice, San Diego, California, United States; Kottoor, J., Department of Conservative Dentistry and Endodontics, Royal Dental CollegeKerala, India; Gonzalez, J.A., Departamento de Endodoncia y Conservadora, Facultad de Odontología, Universitat Internacional de Catalunya, Barcelona, Spain; Flynn, D., Private Practice, London, United Kingdom; Chaniotis, A., Private Practice, Athens, Greece; Cassim, I., Private Practice, Tauranga, New Zealand; Boveda, C., Department of Endodontics, Faculty of Dentistry, Universidad Central de Venezuela, Caracas, Venezuela; Berti, L., Department of Radiology, Faculdade de Odontologia São Leopoldo Mandic, Campinas, Brazil; Altaki, Z., Department of Endodontics, Damascus University, Damascus, Syrian Arab Republic; Alkhawas, M.-B.A.M., Department of Endodontics, Al-Azhar University Faculty of Dental Medicine, Cairo, Egypt; Alfawaz, H., King Saud University, College of Dentistry, Riyadh, Saudi Arabia; Silva, E.J.N.L., Department of Endodontics, School of Dentistry, Grande Rio University, Rio de Janeiro, Rio de Janeiro, Brazil, Department of Endodontics, Fluminense Federal University, Niteroi, Rio de Janeiro, Brazil; Versiani, M.A., Dental Specialty Center, Brazilian Military Police, Minas Gerais, Brazil |
| Source title |
Journal of Endodontics |
| ISSN |
992399 |
| Q |
Q1 |
| Link |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85107049865&doi=10.1016%2fj.joen.2021.04.021&partnerID=40&md5=edfe5f882a997acfeeebac01ca214a4d |
| Abstract |
Introduction
The presence of multiple root canals is an important morphologic aspect of mandibular premolars. This study aimed to perform a worldwide analysis on the prevalence of a lingual canal in mandibular premolars and to evaluate its influence on patients’ demographics in 23 countries using cone-beam computed tomographic images.
Methods
Observers from 23 countries were instructed to evaluate cone-beam computed tomographic images of 300 first and 300 second premolars (13,800 teeth) regarding the presence of a lingual canal, canal configuration, and data related to patients’ ethnicity, age, and sex following a standardized screening methodology. Intra- and interrater evaluations were performed using the Cohen kappa test and intraclass correlation coefficient. Proportion and odds ratio forest plots were calculated in order to compare groups. Statistical significance was set at 5%.
Results
Both kappa and intraclass correlation coefficient values were above 0.60, and the percentage of agreement was 94.9% (first premolar) and 97.8% (second premolar). A significant statistical difference was observed between the worldwide proportion of a lingual canal in mandibular first (23.8%; range, 12.0%–32.7%) and second (5.3%; range, 1.0%–15.3%) premolars (P < .05). Asians and patients over 60 years old were associated with the lowest proportions of a lingual canal (P < .05), whereas Africans and younger groups were associated with the highest proportions (P < .05). The prevalence of a lingual canal in males (27.9%) was higher than females (20.0%) for the first premolar only (P < .05). Males were associated with 1.533 and 1.597 higher odds of presenting a lingual root canal in the first and second premolars, respectively.
Conclusions
The worldwide proportion of a lingual root canal was 23.6% and 5.3% for the first and second premolars, respectively. Ethnicity, geographic region, age, and sex had an influence on the outcomes. |
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