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Updated: Jul 16, 2026
A Standardized Approach to Extra-Oral and Intra-Oral Digital Photography
Published on: July 22, 2022
Evaluation of chronic periapical lesions by digital subtraction radiography by using Adobe Photoshop CS: a technical
Fabiola B Carvalho1, Marcelo Gonçalves, Mário Tanomaru-Filho
1Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, CEP 14801-903 Araraquara, SP, Brazil.
Abstract:
The purpose of this study was to describe a new technique by using Adobe Photoshop CS (San Jose, CA) image-analysis software to evaluate the radiographic changes of chronic periapical lesions after root canal treatment by digital subtraction radiography. Thirteen upper anterior human teeth with pulp necrosis and radiographic image of chronic periapical lesion were endodontically treated and radiographed 0, 2, 4, and 6 months after root canal treatment by using a film holder. The radiographic films were automatically developed and digitized. The radiographic images taken 0, 2, 4, and 6 months after root canal therapy were submitted to digital subtraction in pairs (0 and 2 months, 2 and 4 months, and 4 and 6 months) choosing "image," "calculation," "subtract," and "new document" tools from Adobe Photoshop CS image-analysis software toolbar. The resulting images showed areas of periapical healing in all cases. According to this methodology, the healing or expansion of periapical lesions can be evaluated by means of digital subtraction radiography by using Adobe Photoshop CS software.
