Resumo

LACERDA, Mariane FLS et al. Radiographic Diagnosis of Simulated External Root Resorption in Multi-Rooted Teeth: The Influence of Spatial Resolution. Acta odontol. latinoam. [online]. 2020, vol.33, n.1, pp.14-21.  Epub 01-Jun-2020. ISSN 0326-4815.

The aim of this study was to evaluate the influence of spatial resolution (line pairs per millimetre – lp/mm) on the diagnosis of simulated external root resorption (ERR) in multirooted teeth by using digital periapical radiography. Forty human mandibular molars (80 roots) were used. The roots were divided into the following groups (n = 10): control without root filling (WORF), control with root filling (WRF), small ERRWORF, small ERRWRF, moderate ERRWORF, moderate ERRWRF, extensive ERRWORF and extensive ERRWRF. Four digital radiographs (phosphor storage plates – PSP system) were taken of each tooth in three angulations. The PSPs were scanned with 10, 20, 25 and 40 lp/mm. All images were assessed by three endodontists who used a fivepoint scale for presence and absence of ERR and classified its location (cervical, middle or apical third). ROC curves and oneway ANOVA were performed (p < 0.01). Diagnosis of ERR in nonrootfilled teeth showed higher values of sensitivity for 20 lp/mm and higher values of both specificity and accuracy for 40 lp/mm. In rootfilled teeth, sensitivity and accuracy were higher for 25 lp/mm and spatial resolution had no influence on specificity. The best resolution for diagnosis of small and extensive ERR was 25 lp/mm, whereas for moderate ERR, it was 40 lp/mm. Cervical ERR was the most difficult to diagnose, regardless of the spatial resolution. Higher spatial resolutions have improved the radiographic diagnosis of simulated ERR in multirooted teeth and this should be considered when performing digital radiographs.

Palavras-chave : Digital dental radiography; Root resorption; Diagnostic imaging; Eendodontics.

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