Comparison of dentinal hydraulic conductance according to the application time of oxalate-based desensitizers


  • Eduardo Fernández Universidad de Chile
  • María de los Ángeles Romero Universidad de Chile
  • Cristian Bersezio Universidad de Chile
  • Patricio| Vildósola Universidad de Chile
  • Claudia Letelier Universidad de Chile
  • Osmil Batista Oliveira-Junior Universidade Estadual Paulista
  • Javier Martín Universidad de Chile



Dentin, Conductance, Diffusion, Oxalic acid, Permeability, Dentin tubule occlusion


Introduction: an in vitro model was used to measure the hydraulic conductance in human dentin discs treated with oxalic acid for 15, 30 or 60 s maintaining the occlusive effect and measuring 7 and 14 days after application. Methods: 45 dentin discs measuring 1 mm thick were obtained from human third molars which were free of caries and in no occlusion; the samples were obtained from patients aged 16 to 30 years. Discs were sorted out into three study groups (n = 15) depending on the time of application of a commercial solution of oxalate-based dentin desensitizer (DD) (BisBlock®) which contains ˂ 5% oxalic acid of 1.5-1.8 pH: in group A the agent was applied for 15 s, in group B it was applied for 30 s, and in group C for 60 s. The hydraulic conductance of each disc was calculated after acid etching, which corresponds to the maximum permeability of discs (100%) after immediate application of oxalic acid, as well as seven and fourteen days of storage in saline solution. The statistical analysis was done with ANOVA test and post-hoc Games-Howell test. Results: 35,46 ± 23.41% in Group A, 36.34 ± 15.88% in Group B and 24.99 ± 14.99% in Group C, showing that the use of DD for 15, 30 or 60 s decreased permeability in a statistically significant manner (p <0.05). Conclusions: DD was effective in reducing hydraulic conductance regardless of application time, but this reduction was temporary only, since after seven days permeability returns to values close to those of baseline.

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Author Biographies

Eduardo Fernández, Universidad de Chile

ssistant Professors, Department of Restorative Dentistry, Universidad de Chile

María de los Ángeles Romero, Universidad de Chile

Dental Surgeon, Universidad de Chile

Cristian Bersezio, Universidad de Chile

Scholar, Department of Restorative Dentistry, Universidad de Chil

Patricio| Vildósola, Universidad de Chile

Assistant Professor, Department of Restorative Dentistry, Universidad de Chile.

Claudia Letelier, Universidad de Chile

Assistant Professor, Department of Restorative Dentistry, Universidad de Chile.

Osmil Batista Oliveira-Junior, Universidade Estadual Paulista

Livre-docência Professor, Department of Restorative Dentistry, Dental Area, Universidade Estadual Paulista, São Paulo, Brazil.

Javier Martín, Universidad de Chile

Assistant Professors, Department of Restorative Dentistry, Universidad de Chile


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How to Cite

Fernández, E., Romero, M. de los Ángeles, Bersezio, C., Vildósola, P., Letelier, C., Oliveira-Junior, O. B., & Martín, J. (2015). Comparison of dentinal hydraulic conductance according to the application time of oxalate-based desensitizers. Revista Facultad De Odontología Universidad De Antioquia, 26(2), 336–357.