Data for: Relationship between Canal Morphology and Isthmus in Mesio-buccal Roots of Maxillary First Molars in 9- to 12-year-old Children: an in-vivo Cone-beam Computed Tomography Analysis
Frequencies and percentages were used to describe categorical variables. The 95% confidence interval of the frequency was calculated. Differences in canal morphology and the frequency of RCIs were analyzed by Fisher exact test or Chi square test according to gender and sides. Statistical Package for Social Sciences 20.0 ( IBM Co, New York, NY) was used for statistical analysis. The significance level was set at p < 0.05.