Journal
MICROSCOPY AND MICROANALYSIS
Volume 21, Issue 5, Pages 1264-1270Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927615014713
Keywords
SEM; external root resorption; permanent teeth; foramen morphology; granuloma
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The inflammatory resorption of dental root apex (i.e., the process of removal of cementum and/or dentine through the activity of resorbing cells) may show different configurations and damage the apical root structure. As knowing the morphology of resorption areas of human teeth is essential for the success of endodontic treatments, we investigated the apical resorption by scanning electron microscopy, focusing on roots with granulomas. A total of 30 teeth (with penetrating carious lesions and chronic periapical lesions) were examined, the apical third of the roots were removed and analyzed to estimate periforaminal and foraminal resorption, shape and morphology of foramen resorption, centering of the periforaminal resorption area, and diameters of each apical foramen. Periforaminal resorption was present in all samples, whereas foraminal resorption was present in 92% of cases (mainly funnel shaped). Lacunae were observed in the foraminal resorption area with an average diameter of 35 +/- 14 m. The major and minor diameters of the foramina in teeth with resorption were 443 and 313 m, respectively (higher than in healthy teeth). This result indicates an expansion of the apical diameters caused by the pathology, which could encourage a different clinical instrumentation for these teeth.
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