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Is whitening toothpaste safe for dental health?: RDA-PE method
Jae-Heon Kim1, Soyeon Kim1, Van Mai Truong1
1Department of Oral Anatomy and Dental Research Institute, School of Dentistry, Seoul National University.
Dental Materials Journal
|July 6, 2022
Summary
Whitening toothpastes with hydrogen peroxide showed comparable or lower relative dentin abrasion-profilometry equivalent (RDA-PE) values than regular toothpastes. Toothpaste abrasivity can vary based on whitening agent ingredients and formulation.
Area of Science:
- Dental Materials Science
- Tribology
- Oral Hygiene Research
Background:
- Toothpaste abrasivity is a critical factor influencing dental wear.
- Whitening toothpastes often contain active ingredients that may affect their abrasive properties.
- Understanding the relative dentin abrasion-profilometry equivalent (RDA-PE) is crucial for product safety and efficacy.
Purpose of the Study:
- To compare the relative dentin abrasivity-profilometry equivalent (RDA-PE) values of regular and whitening toothpastes.
- To analyze the pH and abrasive constituents of the tested toothpastes.
- To investigate the relationship between toothpaste composition and dentin abrasivity.
Main Methods:
- Non-contact profilometry was used to determine RDA-PE values after 10,000 brushing cycles on bovine dentin.
- Six toothpaste groups were tested: three regular, two whitening (with sodium bicarbonate and 35% hydrogen peroxide), and a reference slurry.
- Toothpaste pH was measured, and abrasive constituents were analyzed using Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive X-ray Spectroscopy (EDS).
Main Results:
- RDA-PE values ranged from 26 to 166.
- The pH levels of the toothpastes varied between 4.928 and 9.153.
- Whitening toothpastes containing hydrogen peroxide did not exhibit significantly higher RDA-PE values compared to regular toothpastes.
Conclusions:
- The RDA-PE of whitening toothpastes can vary based on the specific whitening agents and their ingredients.
- Hydrogen peroxide-containing whitening toothpastes demonstrate a comparable or lower potential for dentin abrasion than some regular toothpastes.
- Further research into the formulation-abrasivity relationship of whitening toothpastes is warranted.
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