[Clinical study of direct digital radiography in caries detection].
OBJECTIVE
Direct digital radiography is a computer-based image technique, the purpose of this paper is to investigate possible usage of direct digital radiography-radio visiography (RVG) in caries detection in clinic.


METHODS
A human head model with teeth was used to establish the operative exposure time for RVG in vitro, then RVG images for normal and carious tooth were obtained in vivo and were compared with conventional E-speed film in image quality and diagnostic accuracy.


RESULTS
The optimal exposure time for RVG image was obtained, and the exposure time was different in each tooth quarter. The acceptable rate of image quality and diagnostic accuracy of RVG was statistically equivalent to that of E-speed film (P > 0.05), however, the excellent rate of RVG was statistically superior to that of E-speed film (P < 0.05).


CONCLUSIONS
The conventional X-ray will be substituted by RVG in caries detection in clinic.
Hu
T
T
College of Stomatology, West China University of Medical Sciences.
Tan
H
H
Hong
L
L
Wang
H
H
D000293:Adolescent; D000328:Adult; D003731:Dental Caries / Q000000981:diagnostic imaging*; D006801:Humans; D066298:In Vitro Techniques; D008875:Middle Aged; D019252:Radiography, Dental, Digital / Q000379:methods*