[The application of problem-based learning and case-based study in the practice teaching of clinical prosthodontics courses].

Purpose: To study the effect of problem-based learning(PBL) and case-based study(CBS) for knowledge acquisition and clinical performance in the practice teaching of clinical prosthodontics courses.

Methods: Consecutive cohorts of year 2 clinical students taught using a traditional prosthodontics curriculum (students who practiced in Xuzhou Stomatological Hospital from June 2007 to June 2008, n=30) and a PBL and CBS curriculum (who practiced in Xuzhou Stomatology hospital from June 2008 to June 2009, n=30) were compared.Students completed an end-of-attachment examination and a questionnaire in which students were requested to rate themselves on 7 competencies.

[Foreign stone retaining in right post-maxillary molar area for 10 years causing limitation of mouth opening: report of one case].

It is common to see a foreign body retained in the soft tissues of oral and maxillofacial region. However, a foreign body retaining in oral and maxillofacial region for more than 10 years and resulting in limitation of mouth opening is rare. This paper reported a 52-year-old man, who had limitation of mouth opening for more than 1 year caused by a stone retaining in right post-maxillary molar area for 10 years.

[Clinical study of cancellous iliac bone graft in cleft alveolar repair].

Purpose: To analyze the factors affecting the effect of cleft alveolar repair.

Methods: 21 patients with alveolar cleft who were treated in our hospital between 2003-2007 were included in this study. The factors that affected the cleft alveolar repair such as patient's age, cleft type, surgical method, source of bone were analyzed accordingly.

[Clinical observation of the height of the alveolar after bone grafting in cleft alveolar repair in various ages.].

Purpose: To evaluate the changes of transplanted bones after cancellous iliac bone grafting in cleft alveolar repair in various ages.

Methods: The patients were divided into A and B groups according to their canine eruption. The changes of alveolar height in grafting regions were examined by clinical follow up and radiographs after the cancellous iliac bone grafting in cleft alveolar repair.