Comparison of two observational methods, scanning electron and confocal laser scanning microscopies, in the adhesive interface analysis of endodontic sealers to root dentine
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To compare the accuracy of confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) during the analysis of the adhesive interface integrity and intratubular penetration of root canal sealers to radicular dentine.
Materials and methods
Twenty roots of human maxillary incisors were prepared and distributed into two groups (n = 10), followed by filling with gutta-percha and Endofill (G1) or AH Plus (G2). After 7 days, roots were sectioned and analyzed under CLSM and SEM. Score systems were used to evaluate the adhesive interface integrity (0–4) and sealer intratubular penetration (0–3). Data were submitted to Wilcoxon-Mann-Whitney and Kendall correlation statistical tests (α = 5%).
In the adhesive interface analysis, CLSM was similar (P = 0.157) to SEM for Endofill; however, the results were different for AH Plus (P = 0.029). Intratubular penetration had significant difference between observational methods for both sealers (P < 0.0001). Correlation analysis between SEM and CLSM for adhesive interface was moderate for Endofill and low for AH Plus. Intratubular penetration was low for both sealers.
SEM and CLSM analysis had similar results when sealers were compared, with a more homogeneous adhesive interface, and greater intratubular penetration for AH Plus. Comparison between observational methods demonstrated low positive correlation for adhesive interface and intratubular penetration analysis.
A proper interface formed between sealer and dentine is very important for final quality of root canal filling. Observational methods which allow an accurate analysis of this interface must be selected to assess such features.
KeywordsAdhesive interface CLSM Root canal sealer Intratubular penetration SEM
The authors would like to thank the Biocel group (Federal University of Paraná), which kindly performed the CLSM analysis, and the Central Laboratory of Microscopy (LCME, Federal University of Santa Catarina) for SEM Analysis.
This study was financially supported by the “Fundação de Amparo à Pesquisa e Inovação do Estado de Santa Catarina - FAPESC” (grant # TO-10027/2012-7).
Compliance with ethical standards
The Human Research Ethics Committee of the Federal University of Santa Catarina has approved this study (Protocol No 42929015.0.0000.0121).
Conflict of interest
The authors declare that they have no conflict of interest.
For this type of study, formal consent is not required.
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