1Belland B, French B, Ertmer PA.Validity and problem-based learning researeh:A review of the instruments used to assess intended learning outcomes [J]. Interdisciplinary Journal of Problem Based Learning, 2009,3 ( 1 ) : 59-89.
2Fincham AG, Shuler CF. The changing face of dental educa- tion:The impact of PBL[J].J Dent Edue, 2001, 65 (5):406-421.
3Barrows HS. Is it truly possible to have such a thing as PBL? [J].Distance Education,2002,23(1) :119-122.
4Huang C, Bian Z ,Tai B, et al. Dental education in Wuhan, China : Challenges and changes [J]. J Dent Educ, 2009,71 (2) : 304-311.
3McParland M, Noble LM, Livingston G.The effectiveness of problem based learning compared to traditional teaching in undergraduate psychiatry[J].Med Edu, 2004,38( 8 ) : 859-867.