Evaluation of the Developmental Age of Permanent Teeth by the Nolla Method

The developmental age of permanent teeth was evaluated in children and adolescents according to age and gender using the Nolla Method. A retrospective study was performed on panoramic radiographs of 1,200 subjects aged 4-15 years, including 50 children for each age/gender group. Three well-trained examiners estimated the developmental stage of upper and lower permanent teeth using the Nolla Method. The inter-examiner reliability was excellent (intra-class correlation coefficient value