3Rantavuori K, Zerman N, Ferro R, et al. Realationship between children's first dental visit and their dental anxiety in the veneto region of italy[J]. Acta odontol Scand, 2002,60 (5) 297 - 300.
6Humphfis GM, Freeman R, Campbell J, et al. Fuaher evidence for the reliability and validity of the Modified Dental Anxiety Scale [ J ]. Int Dent J,2000,50(6) :367- 370.