关键词: 年轻恒牙, 牙外伤, 治疗, 预后

Abstract:

Traumatic dental injuries， the most serious dental public health are challenging among youth in many countries. The majority of accidents affect adolescents，often when root development of the injured teeth is not completed. Crown fractures and luxations of immature permanent teeth are the most commonly occurring of all dental injuries. The maturity of the tooth is of utmost importance in the choice of treatment. Treatment planning and followup are important for improving a favorable outcome. Crown fractures involving dentin result in exposure of dentinal tubules to the oral environment. Bacteria may penetrate the tubules and cause inflammation in the underlying pulp. When deeply exposed dentin is left unprotected over a longer period of time，the pulp may become necrotic and the crown discolored. The treatment of immature permanent teeth with calcium hydroxide may remove bacteria from the fracture surface and seal off the exposed dentinal tubules by deposition of reparative dentine.  The purpose of the endodontic procedure treatment with calcium hydroxide is to prevent development of inflammatory resorption and achieve healing of periradicular tissues.

Key words: immature permanent teeth, dental trauma, treatment, prognosis