Determination of enamel and coronal dentin microhardness

Authors

  • Fabiano Ribeiro Cirano Department of Stomatology/Periodontics division University of São Paulo
  • Giuseppe Alexandre Romito Department of Stomatology/Periodontics division University of São Paulo
  • José Hildebrando Todescan Department of Stomatology, Periodontics division University of São Paulo

DOI:

https://doi.org/10.20396/bjos.v2i6.8641702

Keywords:

Microhardness. Enamel. Coronal dentin

Abstract

The Vickers microhardness of enamel and coronal dentin of 30 canines was evaluated. The incisal portion of the crown was discarded by means of a transverse section made 5mm, coronally, from the cemento-enamel junction located on the buccal surface obtaining, thus, the coronal specimen, on which measurements on 3 regions of each dental tissue was carried out. The mean value of microhardness at the E1 region (0.05 to 0.1 mm from the external surface) was of 395.92 VHN and at the E2 region (0.3 to 0.5 mm from the external surface) was of 339.41 VHN, E1 and E2 being, statistically different. The mean microhardness at the E3 region (0.05 to 0.1 mm from the dentinoenamel junction), for the free surfaces, was of 255.02 VHN, and for the proximal surfaces, was of 269.72 VHN. Following statistical analysis (Variance Analysis Test, p < 0.05), we concluded that enamel microhardness decreased from the external surface towards the dentinoenamel junction. The mean microhardness of coronal dentin was obtained in 3 regions: the DC1 region (0.05 to 0.1 mm from the dentinoenamel junction) - with a mean of 38.68 VHN; the DC2 region (0.3 to 0.5 mm from the dentinoenamel junction) - with a mean of 56.42 VHN; and the DC3 region (0.8 to 1.0 mm from the dentinoenamel junction) - with a mean of 36.49 VHN. Microhardness at DC2 was statistically greater than that of DC1, which, in turn was greater than that at DC3.

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Author Biographies

Fabiano Ribeiro Cirano, Department of Stomatology/Periodontics division University of São Paulo

Graduate at Odontologia from Universidade de São Paulo (1996), master's at Periodontology from Universidade de São Paulo (2002) and ph.d. at Periodontology from Universidade de São Paulo (2007). Has experience in Odontology, focusing on Clinical Odontology, acting on the following subjects: periodontia, dentina - microdureza, esmalte dentário - microdureza, titanium and osseointegration.

Giuseppe Alexandre Romito, Department of Stomatology/Periodontics division University of São Paulo

Graduate at Dentistry from Universidade de São Paulo (1992), master's at Periodontology from Universidade de São Paulo (1996) and ph.d. at Periodontology from Universidade de São Paulo (2000). Has experience in Odontology, focusing on Periodontology, acting on the following subjects: periodontiacs - periodontal disease, periodontal medicine and implants. Chairman of Peiodontic Division at Dental School of University of São Paulo. President of the IADR Brazilian Division (2011-2012). President of the Brazilian Society of Periodontology (2008-2010).

José Hildebrando Todescan, Department of Stomatology, Periodontics division University of São Paulo

Graduado em Odontologia pela Universidade de São Paulo (1954), fez Doutorado em Odontologia (Periodontia) pela Universidade de São Paulo (1971), com Especialização em Prótese Dental pelo Conselho Regional de Odontologia (1974), Especialização em Periodontia pelo Conselho Regional de Odontologia (1975), Livre Docente pela Universidade de São Paulo (1983), Professor Adjunto pela Universidade de São Paulo ( 1986 por concurso), Professor Associado pela Universidade de São Paulo (1990), Professor Titular de Periodontia no Departamento de Estomatologia, da Universidade de São Paulo, (1992).

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Published

2015-11-12

How to Cite

1.
Cirano FR, Romito GA, Todescan JH. Determination of enamel and coronal dentin microhardness. Braz. J. Oral Sci. [Internet]. 2015 Nov. 12 [cited 2022 Oct. 1];2(6):258-63. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8641702

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