| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
RESEARCH |
1 Centre of Dental Medicine, Department of Operative Dentistry and Periodontology, University of Cologne, Köln, Germany; 2 Department of Medical Statistics, Informatics and Epidemiology, University of Cologne, Germany
*Correspondence to: Rainer Haak, University of Cologne, Centre of Dental Medicine, Department of Operative Dentistry and Periodontology, Kerpener Str. 32, D-50937 Köln, Germany; E-mail: rainer.haak{at}medizin.uni-koeln.de
Received 4 November 2002; revised 20 May 2003; accepted 5 June 2003
Objectives: To evaluate the validity of approximal caries detection on digital bitewing radiographs displayed at different image sizes on either a cathode ray tube (CRT) monitor or a thin film transistor (TFT) monitor.
Methods: Five observers assessed digital radiographs of a charge-coupled device (CCD)-based sensor system (Sidexis®) of 160 unrestored premolars and molars for approximal caries using a six category caries rating scale. Images were displayed at ratios of 1:1, 1:2 and 1:7 on a CRT monitor (Nokia 446 XS) and a TFT display (Panasonic LC 50S). Histological assessments of serial sections were used as the validation standard. Diagnostic accuracy was expressed as area under the receiver operating characteristic (ROC) curve (AUC) and was calculated at two levels of caries penetration: presence of caries (I) and presence of a lesion in the dentine (II). The influence of the factors "monitor type", "image size" and "validation threshold" were analysed with repeated measures analysis of variance.
Results: The ROC curve areas for approximal caries detection at both histological penetration levels were not influenced by the type of monitor display, whereas image size had a significant impact (P<0.01). AUCs for image size 1:7 (I, 0.62; II, 0.65) were smaller compared with ratios of 1:1 and 1:2 (P<0.01). No differences were observed between image size ratios 1:1 (I, 0.69; II, 0.74) and 1:2 (I, 0.68; II, 0.73).
Conclusions: In this study, the type of monitor did not influence approximal caries detection on digital radiographs. Image sizes with a display ratio of 1:1 and 1:2 resulted in better diagnostic validity than those with a ratio of 1:7.
Keywords: digital radiography, dental; image processing; data display; dental caries
This article has been cited by other articles:
 |
|
 |
|
  V Seneadza, A Koob, J Kaltschmitt, H J Staehle, J Duwenhoegger, and P Eickholz Digital enhancement of radiographs for assessment of interproximal dental caries Dentomaxillofac. Radiol., March 1, 2008; 37(3): 142 - 148. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. Berkhout, J. Verheij, K Syriopoulos, G Li, G. Sanderink, and P. van der Stelt Detection of proximal caries with high-resolution and standard resolution digital radiographic systems Dentomaxillofac. Radiol., May 1, 2007; 36(4): 204 - 210. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A Wenzel A review of dentists' use of digital radiography and caries diagnosis with digital systems. Dentomaxillofac. Radiol., September 1, 2006; 35(5): 307 - 314. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S Prapayasatok, A Janhom, K Verochana, and S Pramojanee Digital camera resolution and proximal caries detection. Dentomaxillofac. Radiol., July 1, 2006; 35(4): 253 - 257. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S Kositbowornchai, M Basiw, Y Promwang, H Moragorn, and N Sooksuntisakoonchai Accuracy of diagnosing occlusal caries using enhanced digital images Dentomaxillofac. Radiol., July 1, 2004; 33(4): 236 - 240. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| BJR | DMFR | IMAGING | ALL BIR JOURNALS |
