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Dentomaxillofacial Radiology (2008) 37, 325-329
© 2008 British Institute of Radiology
doi: 10.1259/dmfr/62591340

RESEARCH

Detection of in vitro proximal caries in storage phosphor plate radiographs scanned with different resolutions

G Li*,1, W E R Berkhout2, G C H Sanderink2, M Martins3 and P F van der Stelt2

1Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology, Beijing China; 2Department of Oral and Maxillofacial Radiology, Academic Center for Dentistry, Amsterdam, The Netherlands; 3Department of Dental Radiology, Piracicaba Dentistry School, University of Campinas, Brazil

*Correspondence to: Gang Li, Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology: #22 Zhong Guancun Nandajie, Hai Dian District, Beijing 10008, PR China. E-mail: gangvanli{at}yahoo.com

Received 2 May 2007; revised 9 October 2007; accepted 18 October 2007

Objectives: To investigate the effect of the scanning resolution of storage phosphor plate (SPP) radiographs on the detection of proximal caries lesions.

Methods: 10 dentists evaluated 72 proximal surfaces of premolars with respect to caries from SPP radiographs scanned with theoretical spatial resolutions of: (1) the Digora FMX at 7.8 lp mm–1; (2) the Digora Optime at both 7.8 lp mm–1 and 12.5 lp mm–1; and (3) the Dürr VistaScan at 10 lp mm–1 and 20 lp mm–1, respectively. The lesions were validated by histological examination. Receiver operating characteristic (ROC) analysis was employed.

Results: The Az value for the radiographs scanned with the Dürr VistaScan at 10 lp mm–1 is significantly lower than those for the other series of radiographs (P = 0.000).

Conclusions: For SPP radiographs, an increased theoretical spatial resolution per se is not related to an improved detection of proximal caries.

Keywords: radiology, dental, digital; caries; approximal caries; image processing; image resolution; computer assisted






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