Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods.

When the association between the degree of root resorption and age was analyzed using the numerical method, for the mesial root, highly significant differences were found between the means of the group aged 6–9 years and the group over 15 years old, with a value of 0.218 (95% CI 0.061–0.374; p value = 0.002).

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