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BIBTEX RIS

Worldwide Assessment of the Mandibular First Molar Second Distal Root and Root Canal: A Cross-sectional Study with Meta-analysis

2021; Elsevier BV; Volume: 48; Issue: 2 Linguagem: Inglês

10.1016/j.joen.2021.11.009

1878-3554

Jorge Martins, Christian Nole, Hani Ounsi, Peter Parashos, Gianluca Plotino, Magnús F. Ragnarsson, Rubén Rosas Aguilar, Fábio Santiago, Hussein C. Seedat, Walter Vargas, Murilo von Zuben, Yuerong Zhang, Hussam Alfawaz, Moataz-Bellah A.M. Alkhawas, Zaher Altaki, Luiza Berti, Carlos Bóveda, Imran Cassim, A. Chaniotis, Daniel Flynn, José Antonio González, Jojo Kottoor, Adam Monroe, Emmanuel João Nogueira Leal Silva, Marco A. Versiani,

Oral microbiology and periodontitis research

This study assessed the prevalence of radix entomolaris and 2 canals at the distal aspect of mandibular first molars among different geographic regions by means of cone-beam computed tomographic imaging.Precalibrated observers from 23 worldwide geographic locations followed a standardized screening protocol to assess 5750 cone-beam computed tomographic images of mandibular first molars (250 per region), gathering demographic data and recording the presence of radix entomolaris and a second canal at the distal aspect of teeth. Intra- and interrater reliability tests were conducted and comparisons among groups were performed using proportions and odds ratio forest plots. The significance level was set at 5%.The results of intra- and interrater tests were above 0.79. The prevalence of radix entomolaris varied from 0.9% in Venezuela (95% confidence interval [CI], 0%-1.9%) to 22.4% in China (95% CI, 17.2%-27.6%). Regarding the proportion of a second distal canal, it ranged from 16.4% in Venezuela (95% CI, 11.8%-21.0%) to 60.0% in Egypt (95% CI, 53.9%-66.1%). The East Asia subgroup was associated with a significantly higher prevalence of an extra distolingual root, whereas the American subgroup, the American native ethnic group, and elderly patients were linked to significantly lower percentages of a second canal at the distal aspect of teeth. No significant differences were noted between male or female patients.The overall worldwide prevalence rates of radix entomolaris and a second canal at the distal aspect of the mandibular first molar were 5.6% and 36.9%, respectively. The East Asia geographic region and Asian ethnic group had a higher prevalence of a second distal root.