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. 2012 Dec;42(4):243-7.
doi: 10.5624/isd.2012.42.4.243. Epub 2012 Dec 23.

Measurements of simulated periodontal bone defects in inverted digital image and film-based radiograph: an in vitro study

Rafael Scaf de Molon  1 , Juliana Aparecida Najarro Dearo Morais-Camillo, Celso Eduardo Sakakura, Mauricio Goncalves Ferreira, Leonor Castro Monteiro Loffredo, Gulnara Scaf
Affiliations

Measurements of simulated periodontal bone defects in inverted digital image and film-based radiograph: an in vitro study

Rafael Scaf de Molon et al. Imaging Sci Dent. 2012 Dec.

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 (IC(95%):6.04-6.54) and 6.79 mm (IC(95%):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(IC(95%):6.40-6.89) and 6.79mm(IC(95%):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.

Keywords: Alveolar Bone Loss; Digital Radiography, Dental; Radiographic Image Enhancement.

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Figures

Fig. 1
Fig. 1
A. Film-based image shows the distance from the cementoenamel junction to the deepest region of the defect. B. Inverted digital image shows the distance from the cementoenamel junction to the deepest region of the defect.
Fig. 2
Fig. 2
Direct bone-defect measurement in a dry pig mandible.
Fig. 3
Fig. 3
Mean (m) and 95% confidence limits (LS: upper limit; LI: lower limit) of the bone defect depth (in mm) according to the method (M: direct visual measurements; D: inverted digital image).
Fig. 4
Fig. 4
Mean (m) and 95% confidence limits (LS: upper limit; LI: lower limit) of the bone defect depth (in mm) according to the method (M: direct visual measurements; C: film-based image).
See this image and copyright information in PMC

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