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Water sorption and solubility of polyamide denture base materials
Long G Nguyen1, Hilde M Kopperud2, Marit Øilo1
1Department of Clinical Dentistry, Faculty of Medicine and Dentistry, University of BergenBergenNorway.
Acta Biomaterialia Odontologica Scandinavica
|June 24, 2017
Summary
Polyamide (PA) denture materials exhibit varying water sorption and solubility compared to poly(methyl methacrylate) (PMMA), with PA showing lower solubility. One PA material released a compound, but both remained within standard requirements.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials Science
Background:
- Poly(methyl methacrylate) (PMMA) based dentures can cause adverse reactions in some patients.
- Polyamide (PA) is a potential alternative, but its water sorption and solubility are not well-documented.
Purpose of the Study:
- To compare water sorption and solubility of two PA denture materials against PMMA.
- To identify substances released from PA materials and assess their impact on material hardness.
Main Methods:
- Ten discs of two PA (Valplast, Breflex) and one PMMA material were prepared.
- Water sorption and solubility were measured following a modified ISO 20795-1:2008 standard.
- Gas chromatography/mass spectrometry (GC/MS) analyzed released substances.
Main Results:
- Significant differences in water sorption and solubility were observed among the materials.
- Breflex showed the highest water sorption (30.4 μg/mm³), followed by PMMA (25.8 μg/mm³) and Valplast (13.6 μg/mm³).
- Both PA materials had lower water solubility than PMMA, with a net weight increase. Valplast released 12-aminododecanolactam; Breflex did not.
Conclusions:
- PA denture materials demonstrate varied water sorption and solubility, yet meet standard requirements.
- PA materials exhibited a net weight gain after prolonged water exposure.
- Clinical implications of these findings require further investigation.
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