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Introduction: Molar–incisor malformation is a condition described in 2014, with few reports in the literature and characterized by atypical root formation in incisors and first permanent molars. Case Report: We report a case of an 8-year-old patient with central incisors and upper and lower first permanent molars with short roots and open apexes, situation not compatible with the chronological age. The patient was evaluated clinically, radiographically, and by blood tests. Anatomopathological analyses of a primary tooth were performed. Computed tomography (CT) was used to evaluate root development of first permanent molars and incisors and compare, by superimposition, the radicular aspect of affected with unaffected teeth of a control patient of the same sex and age. Clinically, the patient presented tongue-thrust habit, central incisors with premature contact and abnormal mobility, and enamel hypoplasia at teeth #8 and #24. Imaging exams showed teeth #3, #8, #9, #14, #19, #24, #25, and #30 with short roots and open apexes. One year follow-up CT images evidenced absence of root development of these teeth and thin roots walls, especially at the incisors. Interceptive orthodontic treatment with fixed palatal crib was performed. Conclusion: This report showed the importance of early diagnosis and treatment of molar–incisor malformation patients.

Differential diagnosis, three-dimensional imaging aspects and interceptive orthodontic management of molar–incisor malformation