2004
DOI: 10.1097/01.don.0000129964.50505.b2
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Evaluation of Periapical Lesion Healing by Correction of Gray Values

Abstract: The purpose of this study was to compare two methods for evaluating periapical healing in humans: the periapical index (PAI) and a gray value correction method. Fifty human teeth with a periapical lesion were endodontically treated. Radiographs, with a special aluminum device, were taken postoperatively, after 3 months and after 6 months. The PAI was recorded at each period of time, and a Kruskall and Wallis test was performed to compare the three groups. After scanning, the size of the lesion and its gray val… Show more

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Cited by 32 publications
(36 citation statements)
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“…A 0.1% copper should create a 1.25% systematic error 18) . Digital radiology does not involve film development, a process that introduces variation in the final radiograph 9,11,12) . The absorbance of the aluminum alloy 1100 step wedge changes very little between digital radiographs taken at the same exposure time and target distance.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…A 0.1% copper should create a 1.25% systematic error 18) . Digital radiology does not involve film development, a process that introduces variation in the final radiograph 9,11,12) . The absorbance of the aluminum alloy 1100 step wedge changes very little between digital radiographs taken at the same exposure time and target distance.…”
Section: Discussionmentioning
confidence: 99%
“…In digital imaging, the gray scale is inverted in comparison with optical density such that white is allotted a value of 255 (for an 8-bit image) and black is 0. Traditional film development, unless preformed carefully, can produce significant variations in the final radiograph and digital method should provide more consistent results 9,11) . Only few studies investigated the radiopacity of dental composite resins in recent ten years and since that many new dental composite materials have been introduced to dental market 5,12,13) .…”
Section: Introductionmentioning
confidence: 99%
“…16,30,31 Digital image analysis is considered to have the same accuracy as transmission densitometry and can produce measurements equivalent to those obtained with film with reduced noise, providing precise and trustworthy numerical values for comparative radiodensity studies. 19,22,[31][32][33][34] Transmission densitometry measures optical density, a logarithmic measure of the ratio of transmitted to incident light through the film image.…”
Section: Discussionmentioning
confidence: 99%
“…It is also important in assessing treatment results and for epidemiological studies. Most of the times it is also difficult to properly evaluate healing of periapical lesions because the recall radiographs are taken at long intervals and are developed differently (13).…”
Section: Discussionmentioning
confidence: 99%