Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
EndodontologyComparative radiographic and histological analyses of periapical lesion development
Section snippets
Materials and Methods
The second, third, and fourth mandibular premolars and the second and third maxillary premolars of 4 approximately 1-year-old mongrel dogs were selected for treatment, totaling 64 roots that were randomly assigned to 4 groups. The experimental protocols were in accordance with the Institutional Animal Care and Use Committee.
The animals were anesthetized intravenously with 3% sodium thiopental (Thionembutal; Abbott Laboratórios do Brasil Ltda., Rio de Janeiro, RJ, Brazil) and periapical
Results
The mean values for the areas of radiographically and histologically detected periapical lesions at different periods of lesion formation are presented in Fig. 3, Fig. 4.
The results of ANOVA and Tukey's test showed no statistically significant difference (P > .05) between the sizes of the periapical lesions detected radiographically at the experimental periods of 7 and 15 days, and 15 and 30 days. At 60 days, the lesions were significantly larger (P < .05) than those detected at the earlier
Discussion
Periapical radiography is the most widely used method for visualization of periapical lesions, but it has some limitations.10, 11, 12 Several factors can affect the radiographic evaluation of bone lesions, such as variable thickness of the cortical layer, angle of incidence of the x-ray beam, composition of the mineralized tissues, lesion location, and mode of x-ray film processing.10 Periapical radiography is poor in detecting periapical bone resorption involving only medullar bone before it
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