Comparing the reliability and accuracy of clinical measurements using plaster model and the digital model system based on crowding severity.

Background: This study aims to clarify whether 3Shape™ digital model system could be applied in orthodontic diagnostic analysis with certainty, especially under different crowding condition. Reliability, accuracy and efficiency of 3Shape™ digital model system were assessed by comparing them with traditional plaster cast.

Methods: 29 plaster casts with permanent dentition were transformed into digital models by 3Shape™ D800 scanner.

A multicenter study of oral lichen planus in Thai patients.

Aim: Oral lichen planus is an oral mucosal disease that affects middle-aged patients. The characteristics of oral lichen planus in Thai patients from a multicenter were studied.

Methods: Data of 533 patients from the oral medicine clinics at Chulalongkorn and Mahidol (central Thailand), Chiang Mai (northern Thailand), and Khon Kaen (northeastern Thailand) universities during 2002-2007 were analyzed.