Abstract
Objectives
This study aims to correlate patient-reported reactions with in vitro analyses of the pH, abrasive quality, and cytotoxicity of four toothpastes.
Materials and Methods
One hundred twenty-one patients received non-identified samples of toothpaste to be used for 6 days and answered a questionnaire about their sensations. In vitro analysis: the pH of toothpastes was measured with a pH meter. The abrasivity of toothpastes was evaluated against composite resin specimens (n = 10). A toothbrushing machine was used to simulate wear, which was indirectly measured by mass loss using a scale. Cell culture media conditioned with toothpaste were used to assess the cytotoxicity. Confluent cells were kept in contact with the conditioned media or control for 24 h. The cell viability was measured using the 3-(bromide, 4,5-dimethylthiazol-2yl)-2,5-diphenyltetrazolium (MTT)-reduction assay. The obtained data on the pH, weight loss, and cell viability were compared by ANOVA/Tukey’s tests (p < 0.05).
Results
With the exception of the bleaching effect paste, the Oral B® paste produced the highest frequencies of irritation reports, tooth sensitivity, taste discomfort, and texture discomfort in the clinical study; patients also reported rougher teeth, soft tissue peeling, dry mouth, thrush, tingling, and taste changes in response to this paste. The in vitro analysis demonstrated that Oral B® had the lowest pH, the highest abrasivity, and produced the lowest cell viability (p < 0.01).
Conclusion
Results suggest that low pH toothpastes that are highly abrasive and cytotoxic may cause undesirable reactions in patients.
Clinical relevance
Toothpaste’s properties should be well known for indication to patient therefore minimizing discomfort reports.
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Acknowledgments
The authors would like to thank Colgate-Palmolive for the toothpastes donation. This study was supported by the authors and received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. Also, this study did not have any perceived and the authors declare that they have no conflict of interest.
Ethical standards
This study was approved by the Ethical Committee in Research of the Ibirapuera University (protocol 367 763). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Bruno, M., Taddeo, F., Medeiros, I.S. et al. Relationship between toothpastes properties and patient-reported discomfort: crossover study. Clin Oral Invest 20, 485–494 (2016). https://doi.org/10.1007/s00784-015-1539-8
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DOI: https://doi.org/10.1007/s00784-015-1539-8