[Effect of pH on the surface roughness of heat cured denture base acrylic resins].

Autor:	Constantinescu IR; Facultatea de Medicină Dentară, Disciplina de Diagnostic oro-dentar si Gerontostomatologie, Universitatea de Medicină si Farmacie 'Gr.T. Popa' Iaşi., Ursache M, Mardarez D
Jazyk:	Romanian; Moldavian; Moldovan
Zdroj:	Revista medico-chirurgicala a Societatii de Medici si Naturalisti din Iasi [Rev Med Chir Soc Med Nat Iasi] 2007 Apr-Jun; Vol. 111 (2), pp. 477-81.
Abstrakt:	Unlabelled: Atomic force microscopy can be used to observe the surface changes of dental acrylic resins, providing valid information about the degradation and performance in time of these materials. Aim: To investigate the influence of pH on the surface roughness of heat cured denture base acrylic resins using atomic force microscopy. Material and Method: Two commercially available heat cured denture base acrylic resins were used to fabricate 18 test samples (2,5x1 cm2). The surfaces were polished and the samples were stored in artificial saliva Afnor, with a pH value of 5.5 and 6.8. Three samples from every type of acrylic resins were considered reference samples. Roughness measurements were made using atomic force microscopy. Results: The denture base acrylic resins showed a higher roughness when the pH was more acid. Conclusions: The atomic force microscopy is a non-invasive method which allows to record high-resolution images of the surface topography of acrylic resins. The salivary acidity affects the surface features of the acrylic resins, increasing the roughness.
Databáze:	MEDLINE
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