[Progressively transformed germinal center in oral and maxillofacial region: report of 3 cases].

Purpose: To discuss the diagnosis and prognosis of progressively transformed germinal center and emphasize the necessity of long term follow-up after treatment.

Methods: Three patients were diagnosed as progressively transformed germinal center (PTGC) from 2010 to 2012. The clinical characteristics, histological features, differential diagnosis, prognosis were analyzed with review of literatures.

[Root canal therapy opportunity in replanted teeth due to injury.].

Purpose: To investigate the opportunity of different root canal therapies in replantation of tooth due to injury.

Methods: 49 cases with teeth luxation were randomly divided into three groups. In group A, the pulp was removed before replanted, and calcium hydroxide was filled in root canals and condensated routinely after half a year.

[Effect of tinidazole-dexamethasone-iodoform paste on controlling endodontic interappointment emergencies].

Purpose: To compare the clinical effect of tinidazole-dexamethasone-iodoform paste on intracanal dressing medication for teeth with chronic periapical periodontitis with that of formocresol.

Methods: 520 permanent teeth with chronic periapical periodontitis were selected and divided randomly into tinidazole-dexamethasone-iodoform paste group (A group) and formocresol group (B group). The periapical signs and symptoms were recorded, radiographs were taken.

[Use of cortical (lag) screws in internal fixation of mental fractures].

Purpose: To evaluate the clinical results of cortical (lag) screws in internal fixation of mental fractures.

Methods: 12 patients with single linear mental fracture underwent internal fixation using cortical screws. The patients were followed up for 6 to 9 months after fixation.