Evaluation of the Actual and Labeled Concentrations of 5% Sodium Hypochlorite in Different Commercial Brands in Chile and Their Pulp Tissue Dissolution Capacity

Authors

  • Rita Toloza Espinoza Universidad Andrés Bello, Santiago (Chile)
  • Pilar Araya Cumsille Universidad Andrés Bello, Santiago (Chile)
  • Constanza Díaz Riquelme Universidad Andrés Bello, Santiago (Chile)
  • Dominique Cofré Aguilera Universidad Andrés Bello, Santiago (Chile)
  • Víctor Díaz-Narváez Universidad Andrés Bello, Santiago (Chile)

DOI:

https://doi.org/10.14482/sun.42.02.587.261

Keywords:

Pulp tissue dissolution, Sodium hypochlorite, Root canal irrigant.

Abstract

Sodium hypochlorite (NaOCl) is essential in endodontics for cleaning and disinfecting the root canal
system, facilitating treatment success by eliminating pathogenic microorganisms and promoting
periapical health. The efficacy of NaOCl primarily depends on its concentration; however, although
various commercial formulations are available, the actual concentration may deviate from
the labeled value.
Objectives: To evaluate the concentration of three commercial brands of 5% NaOCl available in
Chile, analyze the total chlorine percentage in each product, and assess their pulp tissue dissolution
capacity by measuring the required time.
Materials and methods: An in vitro experimental study was conducted using pulp tissue from sixty
healthy permanent teeth. The samples were divided into six groups and immersed in 5% NaOCl solutions from the brands Hertz, Prime, and Aval Clor. The concentration of NaOCl was determined
by spectrophotometry, measuring total chlorine content, and the time required for pulp tissue dissolution
was documented.
Results: The average detected chlorine concentrations were 4.91% (Hertz), 4.70% (Aval Clor), and
4.36% (Prime). Statistical analyses using Shapiro-Wilk and Levene tests revealed significant differences
(p < 0.05). Hertz exhibited the closest concentration to the labeled 5%, while Prime displayed
the lowest concentration and the longest pulp dissolution time.
Conclusions: The pulp tissue dissolution capacity is proportional to the concentration of NaOCl.
Longer exposure times to sodium hypochlorite increase tissue dissolution. Significant differences
were identified between the labeled and actual concentrations of the tested products.

Author Biographies

  • Rita Toloza Espinoza, Universidad Andrés Bello, Santiago (Chile)

    Profesora asistente, Especialidad de Endodoncia, Universidad Andrés Bello, Santiago (Chile). rita.toloza@unab.cl. https://orcid.org/0000-0003-2401-7117

  • Pilar Araya Cumsille, Universidad Andrés Bello, Santiago (Chile)

    Profesor asociado, Especialidad de Endodoncia, Universidad Andrés Bello, Santiago (Chile). pilar.araya@unab.cl. https://orcid.org/ 0000-0001-8993-1191

  • Constanza Díaz Riquelme, Universidad Andrés Bello, Santiago (Chile)

    Cirujana dentista, Universidad Andrés Bello, Santiago (Chile). nstnzdz@gmail.com.
    https://orcid.org/00009-0003-7769-9382

  • Dominique Cofré Aguilera, Universidad Andrés Bello, Santiago (Chile)

    Cirujana dentista, Universidad Andrés Bello, Santiago (Chile). dominiquecofre@gmail.com. https://orcid.org/0009-0000-1610-3811

  • Víctor Díaz-Narváez, Universidad Andrés Bello, Santiago (Chile)

    Profesor investigador, Universidad Andrés Bello, Santiago (Chile).
    victor.diaz@unab.cl.
    https://orcid.org/0000-0002-5486-0415

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Published

2026-07-09

Issue

Section

ORIGINAL ARTICLE

How to Cite

Evaluation of the Actual and Labeled Concentrations of 5% Sodium Hypochlorite in Different Commercial Brands in Chile and Their Pulp Tissue Dissolution Capacity. (2026). SCIENTIFIC JOURNAL SALUD UNINORTE, 42(2), 286-302. https://doi.org/10.14482/sun.42.02.587.261

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