ABSTRACT
The aim of this study was to compare the accuracy of conventional film radiographs, digitized radiographs, and RadioVisioGraphy (RVG) for the detection of dentinal caries in occlusal surfaces of noncavitated extracted teeth. Eighty-one fully erupted extracted third molars were assessed by four observers using five radiographic methods: conventional film radiographs, digitized radiographs with contrast enhancement and with a filtering procedure, and RVG with contrast enhancement and with x function. Scoring criteria were dichotomous. Histologic sections (500 to 600 microns thick) served as the validation criterion. The two digital methods with contrast enhancement tended to perform more accurately than, although not significantly different from, the other three methods (p greater than 0.05). Average likelihood ratios (true positive/false positive) were 4.3 (conventional film radiographs), 4.4 (RVG with contrast enhancement), 3.6 (RVG with x function), 4.9 (digitized radiographs with contrast enhancement), and 3.7 (digitized radiographs with filtering procedure). Observers 1 and 2 (oral radiologists) performed better than observers 3 and 4 with all five methods (p less than 0.005).
Subject(s)
Dental Caries/diagnostic imaging , Dentin/diagnostic imaging , Molar, Third/diagnostic imaging , Radiography, Dental/methods , Adolescent , Adult , Contrast Media , False Negative Reactions , False Positive Reactions , Humans , Likelihood Functions , Male , Observer Variation , Predictive Value of Tests , Radiographic Image Enhancement , Reproducibility of ResultsABSTRACT
A comparison of the physical properties of a new charge-coupled device-based direct digital intraoral radiographic system, its predecessor, and high-speed silver halide intraoral radiographic films is reported. The new system proved to have a higher dose dynamic than the former device. The resolving power of the new system is 11 line pairs/mm compared with a maximum of 14 line pairs/mm for intraoral film.
Subject(s)
Radiographic Image Enhancement/methods , Radiography, Dental/methods , X-Ray Film , Evaluation Studies as Topic , Humans , Radiographic Image Enhancement/instrumentation , Radiography, Dental/instrumentationABSTRACT
A comparison of physical properties has been made between conventional intraoral films and images made with the RadioVisioGraphy (RVG) system, a unit based on the charged coupled device. The RVG system uses considerably reduced levels of radiation to produce an image immediately after exposure. RVG resolution is slightly lower than that with silver halide emulsion films; however, radiographic information may be increased by electronic image treatment.
Subject(s)
Image Processing, Computer-Assisted , Radiographic Image Enhancement , Radiography, Dental , Densitometry , Humans , Image Processing, Computer-Assisted/instrumentation , Models, Structural , Radiation Dosage , Radiographic Image Enhancement/instrumentation , Radiography, Dental/instrumentation , X-Ray Film , X-Ray Intensifying ScreensABSTRACT
RadioVisioGraphie, an electronic system that allows taking intraoral radiographs without film and developing time, was evaluated in comparison to conventional dental films (Ultraspeed D, Kodak). The RVG-system proved to be much more sensitive and capable of displaying a wider object range than film.