Influence of root depth and the post type on Knoop hardness of a dualcured resin cement


  • Murilo de Sousa Menezes University of Uberlândia
  • Adeliana Garcia Veríssimo University of Uberlandia
  • Rodrigo Borges Fonseca University of Campinas
  • André Luís Faria Silva State University of Campinas
  • Luís Roberto Marcondes Martins State University of Campinas
  • Carlos José Soares Federal University of Uberlândia Uberlândia



Fiber post. Knoop hardness. Polymerization dept. Dual-cured resin cement


Fiber posts are usually luted to the root canal with dual-cured resin cements. However, some of these cements require light-activation in order to reach optimal degree of cure. The aim of this study was to evaluate the effect of the fiber post type on microhardness of a dualcured resin cement used for luting these posts. After endodontic treatment, four fiber post types were luted to the root canal of bovine incisors with RelyX ARC. The samples were sectioned in order to obtain four slices, representing different depths (0.0; 2.5; 5.0; 7.5 and 10.0mm). Knoop microhardness testing was performed in each slice. The data were submitted to split-plot ANOVA and Tukey post-hoc tests. An additional sample per fiber post type was used to analyze bonding interface by SEM. At the depths of 0 and 2.5 mm, the resin cement presented the highest hardness values. The lowest values were observed at the 10 mm depth, and the resin cement presented intermediary hardness means at the depths of 5 mm and 7.5 mm. By means of scanning electronic microscopy, it was possible to see the more homogeneous hybrid layer in the cervical region of the root.


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Author Biographies

Adeliana Garcia Veríssimo, University of Uberlandia

Dra. Adeliana Verissimo é Cirurgiã-Dentista em Natal, RN. Possui graduação em odontologia pela UNP - Universidade Potiguar, 2003. Atua como clínico geral. Faz parte do iDent desde Janeiro de 2013.

Rodrigo Borges Fonseca, University of Campinas

Professor Adjunto DE, Coordenador de Pesquisa da FO-UFG, Líder da Rede Goiana de Pesquisa em Biologia Oral, Biomateriais, Biomecânica e Ensaios Clínicos em Odontologia. Vice-coordenador do Programa de Mestrado em Odontologia da UFG (2012-2014)

Luís Roberto Marcondes Martins, State University of Campinas

Possui graduação em Odontologia pela Universidade de São Paulo (1982), especialização em dentística (1986) e implantodontia (1994). Mestre (1986) e doutor (1991) em Odontologia pela Universidade de São Paulo. Atualmente é professor titular da Universidade Estadual de Campinas / FOP e exerce o cargo de Coordenador da Clínica de Graduação. Tem experiência na área de Odontologia, com ênfase em Dentística, atuando principalmente nos seguintes temas: resina composta, biomecânica, análise por elementos finitos, restaurações indiretas, adesão, propriedades mecânicas.


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How to Cite

Menezes M de S, Veríssimo AG, Fonseca RB, Silva ALF, Martins LRM, Soares CJ. Influence of root depth and the post type on Knoop hardness of a dualcured resin cement. Braz. J. Oral Sci. [Internet]. 2016Jan.21 [cited 2021Dec.1];6(21):1337-43. Available from:




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