Jorge N R Martins1, Moataz-Bellah A M Alkhawas2, Zaher Altaki3, Gianmarco Bellardini4, Luiza Berti5, Carlos Boveda6, Antonis Chaniotis7, Daniel Flynn8, Jose Antonio Gonzalez9, Jojo Kottoor10, Miguel Seruca Marques11, Adam Monroe12, Hani F Ounsi13, Peter Parashos14, Gianluca Plotino15, Magnús F Ragnarsson16, Ruben Rosas Aguilar17, Fábio Santiago18, Hussein C Seedat19, Walter Vargas20, Murilo von Zuben21, Yuerong Zhang22, Yongchun Gu23, António Ginjeira24. 1. Department of Endodontics, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal; Instituto de Implantologia, Lisbon, Portugal. Electronic address: jnr_martins@yahoo.com.br. 2. Department of Endodontics, Al-Azhar University Faculty of Dental Medicine, Cairo, Egypt. 3. Department of Endodontics, Damascus University, Damascus, Syria. 4. Private Practice, Latina, Italy. 5. Department of Radiology, Faculdade de Odontologia São Leopoldo Mandic, Campinas, Brazil. 6. Department of Endodontics, Faculty of Dentistry, Universidad Central de Venezuela, Caracas, Venezuela. 7. Private Practice, Athens, Greece. 8. Private Practice, London, England. 9. Departamento de Endodoncia y Conservadora, Facultad de Odontología, Universitat Internacional de Catalunya, Barcelona, Spain. 10. Department of Conservative Dentistry and Endodontics, Indira Gandhi Institute of Dental Science, Kothamangalam, Kerala, India. 11. Private Practice, Amsterdam, The Netherlands. 12. Private Practice, San Diego, California. 13. Department of Restorative Dentistry and Endodontics, Lebanese University, Beirut, Lebanon; Department of Endodontics and Restorative Dentistry, Siena University, Siena, Italy. 14. Melbourne Dental School, University of Melbourne, Melbourne, Australia. 15. Private Practice, Rome, Italy. 16. Private Practice, Hafnarfjördur, Iceland. 17. Department of Endodontics, Escuela Nacional de Estudios Superiores Universidad Nacional Autónoma de México, León, México. 18. Private Practice, Paris, France. 19. Private Practice, Durban, South Africa. 20. Private Practice, San Jose, Costa Rica. 21. Private Practice, Brussels, Belgium. 22. Department of Conservative Dentistry and Endodontics, School of Stomatology, Nanjing Medical University, Nanjing, China. 23. Department of Dentistry and Central Lab, The First People's Hospital of Wujiang District, Nantong University, Suzhou, China. 24. Department of Endodontics, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal.
Abstract
INTRODUCTION: Maxillary first molar second mesiobuccal (MB2) root canal prevalence may change among different populations. The aim of this study was to analyze the worldwide prevalence of the MB2 root canal and understand its possible relation with sex, age, side, and root configuration using in vivo cone-beam computed tomographic (CBCT) assessment. METHODS: Observers from 21 regions were calibrated to achieve a similar CBCT assessment methodology and instructed to collect data from 250 maxillary first molars in previously existing examinations. Intra- and interrater reliability tests were performed. The sample size included 5250 molars and was defined by way of a preliminary trial. Data collected included MB2 presence, sex, age, side, number of roots per tooth, and mesiobuccal root configuration. The z test for proportions in independent groups was used to analyze the differences among subgroups. P < .05 was considered significant. RESULTS: The worldwide CBCT-assessed MB2 prevalence was 73.8%, ranging from 48.0% in Venezuela to 97.6% in Belgium. The prevalence in males and females was 76.3% and 71.8%, respectively (P < .05). Significantly higher MB2 proportions were found in younger patients and 3-rooted molar configurations. The group intraclass correlation coefficient and the percentage of agreement for the MB2 presence were 0.95 and 0.91, respectively. The intrarater Cohen kappa value was above 0.61 for all observers. CONCLUSIONS: MB2 prevalence in the analyzed regions varied widely. The differences may be associated with specificities within each region but also patient demographics. Males, younger patients, and 3-rooted configurations were associated with higher MB2 proportions.
INTRODUCTION: Maxillary first molar second mesiobuccal (MB2) root canal prevalence may change among different populations. The aim of this study was to analyze the worldwide prevalence of the MB2 root canal and understand its possible relation with sex, age, side, and root configuration using in vivo cone-beam computed tomographic (CBCT) assessment. METHODS: Observers from 21 regions were calibrated to achieve a similar CBCT assessment methodology and instructed to collect data from 250 maxillary first molars in previously existing examinations. Intra- and interrater reliability tests were performed. The sample size included 5250 molars and was defined by way of a preliminary trial. Data collected included MB2 presence, sex, age, side, number of roots per tooth, and mesiobuccal root configuration. The z test for proportions in independent groups was used to analyze the differences among subgroups. P < .05 was considered significant. RESULTS: The worldwide CBCT-assessed MB2 prevalence was 73.8%, ranging from 48.0% in Venezuela to 97.6% in Belgium. The prevalence in males and females was 76.3% and 71.8%, respectively (P < .05). Significantly higher MB2 proportions were found in younger patients and 3-rooted molar configurations. The group intraclass correlation coefficient and the percentage of agreement for the MB2 presence were 0.95 and 0.91, respectively. The intrarater Cohen kappa value was above 0.61 for all observers. CONCLUSIONS: MB2 prevalence in the analyzed regions varied widely. The differences may be associated with specificities within each region but also patient demographics. Males, younger patients, and 3-rooted configurations were associated with higher MB2 proportions.
Authors: Ronald Ordinola-Zapata; Jorge N R Martins; Hugo Plascencia; Marco A Versiani; Clovis M Bramante Journal: Clin Oral Investig Date: 2020-05-07 Impact factor: 3.573
Authors: Michael Solomonov; Hyeon-Cheol Kim; Avi Hadad; Dan Henry Levy; Joe Ben Itzhak; Oleg Levinson; Hadas Azizi Journal: Restor Dent Endod Date: 2020-03-04
Authors: Eman Al Mheiri; Jahanzeb Chaudhry; Salma Abdo; Rashid El Abed; Amar Hasan Khamis; Mohamed Jamal Journal: BMC Oral Health Date: 2020-10-07 Impact factor: 2.757