Introduction:

treatment of immature teeth with incomplete apexes is challenging for dentistry professionals.

Case Report:

a seven and half-year-old boy who came to the dentist office with antecedents of dental trauma (non-complicated crown fracture), having not treatment in the adequate moment. He was received with a camera abscess for presenting an acute abscess six months after the accident approximately. After the radiological study a necro-pulpectomy was performed with apexogenesis and laser therapy. After a 24-month-treatment and with a very reserved prognosis for having only a third of the root-formation, the treatment was successful, demonstrating the high regenerative power of laser irradiation and calcium hydroxide.

Conclusions:

it is an exceptional case that demonstrates the effectiveness of laser therapy and the placing of calcium hydroxide considering the size of the root at initial treatment, the history of an acute abscess, the reinfection during treatment and the periapical bone lysis with radiographic characteristics of a granuloma.

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