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Imaging Sci Dent. 2012 Dec;42(4):243-247. English. In Vitro. https://doi.org/10.5624/isd.2012.42.4.243
de Molon RS , Morais-Camillo JA , Sakakura CE , Ferreira MG , Loffredo LC , Scaf G .
Department of Diagnosis and Surgery, Araraquara Dental School, Universidade Estadual Paulista, Sao Paulo, Brazil. molon.foar@yahoo.com.br
Barretos Dental School, Barretos Educational Fundation, Sao Paulo, Brazil.
Department of Social Dentistry, Araraquara Dental School, Universidade Estadual Paulista, Sao Paulo, Brazil.
Abstract

PURPOSE: This study was performed to compare the inverted digital images and film-based images of dry pig mandibles to measure the periodontal bone defect depth. MATERIALS AND METHODS: Forty 2-wall bone defects were made in the proximal region of the premolar in the dry pig mandibles. The digital and conventional radiographs were taken using a Schick sensor and Kodak F-speed intraoral film. Image manipulation (inversion) was performed using Adobe Photoshop 7.0 software. Four trained examiners made all of the radiographic measurements in millimeters a total of three times from the cementoenamel junction to the most apical extension of the bone loss with both types of images: inverted digital and film. The measurements were also made in dry mandibles using a periodontal probe and digital caliper. The Student's t-test was used to compare the depth measurements obtained from the two types of images and direct visual measurement in the dry mandibles. A significance level of 0.05 for a 95% confidence interval was used for each comparison. RESULTS: There was a significant difference between depth measurements in the inverted digital images and direct visual measurements (p>|t|=0.0039), with means of 6.29 mm (IC95%:6.04-6.54) and 6.79 mm (IC95%:6.45-7.11), respectively. There was a non-significant difference between the film-based radiographs and direct visual measurements (p>|t|=0.4950), with means of 6.64mm(IC95%:6.40-6.89) and 6.79mm(IC95%:6.45-7.11), respectively. CONCLUSION: The periodontal bone defect measurements in the inverted digital images were inferior to film-based radiographs, underestimating the amount of bone loss.

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