Abstract
ObjectiveThis study evaluated experimentally-induced periapical bone loss sites using digital radiographic and histopathologic parameters. Material and MethodsTwenty-seven Wistar rats were submitted to coronal opening of their mandibular right first molars. They were radiographed at 2, 15 and 30 days after the operative procedure by two digital radiographic storage phosphor plates (Digora®). The images were analyzed by creating a region of interest at the periapical region of each tooth (ImageJ) and registering the corresponding pixel values. After the sacrifice, the specimens were submitted to microscopic analysis in order to confirm the pulpal and periapical status of the tooth. ResultsThere was significant statistically difference between the control and test sides in all the experimental periods regarding the pixel values (two-way ANOVA; p<0.05). ConclusionsThe microscopic analysis proved that a periapical disease development occurred during the experimental periods with an evolution from pulpal necrosis to periapical bone resorption.
Highlights
Digital intraoral radiographic systems have several advantages compared with conventional film-based radiography
Radiographic analysis The radiographic analysis showed that the pixel values in the three experimental periods increased on the test side in comparison with the control side, indicating bone loss in a similar manner both PSPs plates used
The periapical inflammation was induced by coronal opening of the mandibular right first molar and confirmed that only coronal opening and pulp contact with the oral cavity were sufficient for inducing periapical disease
Summary
Digital intraoral radiographic systems have several advantages compared with conventional film-based radiography. These advantages, in Endodontics, include the potential of a lower radiation exposure to the patient and faster image display. These advantages, in Endodontics, include the potential of a lower radiation exposure to the patient and faster image display25 It was introduced the opportunity of evaluating the progression of periapical bone loss by digital tools as the pixel values. Periapical lesions confined to cancellous bone could be detected radiographically using pixel values using one of the tools of the digital image, the histogram. The aim of this study was to induce periapical disease in rats to assess the pixel values in different experimental periods to evaluate the bone loss progression
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