Imaging Sci Dent.  2012 Dec;42(4):243-247. 10.5624/isd.2012.42.4.243.

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

• de Molon R
• Morais-Camillo JAND
• Sakakura C
• Ferreira M
• Loffredo L
• Scaf G

• KMID: 1806791
• DOI: http://doi.org/10.5624/isd.2012.42.4.243

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.

Keyword

Digital Radiography, Dental; Radiographic Image Enhancement; Alveolar Bone Loss

MeSH Terms

Alveolar Bone Loss
Bicuspid
Mandible
Radiographic Image Enhancement
Radiography, Dental, Digital
Tooth Cervix