Sorption and solubility of 12 soft denture liners

Abstract

The long-term stability of a soft denture liner depends to a large extent on the sorption and solubility of the liner. Because sorption and solubility are accompanied by a volumetric change, bacterial infestation, hardening, and color change, it is a physical property of importance. The purpose of this investigation was to determine the sorption and solubility of 12 soft denture liners (Verno-Soft, Super Soft, ProTech, Soft-Pak, Flexor, Novus, Molloplast-B, Durosoft, Justi Soft, Velvesoft, VinaSoft and Prolastic). They include nine copolymers, two silicones and one polyphosphazene fluoroelastomer. The sorption and solubility test was performed as outlined in American Dental Association (ADA) specification 12 for denture base polymers. Five specimens of each material were tested and data were collected at 1 week, 1 month, 3 months, 6 months, and 1 year. Sorption data varied from 0.2 to 5.6 mg/cm2 at 1 week; 0.3 to 12.5 mg/cm2 at 1 month; 0.1 to 22.0 mg/cm2 at 3 months; 0.1 to 13.6 mg/cm2 at 6 months; and 0.1 to 35.7 mg/cm2 at 12 months. Solubility data varied from 0.0 to 0.4 mg/cm2 at 1 week; 0.1 to 0.8 mg/cm2 at 1 month; +0.1 to 1.2 mg/cm2 at 3 months; 0.0 to 1.9 mg/cm2 at 6 months; and +0.2 to 2.3 mg/cm2 at 1 year. A statistical analysis of the data by two-way ANOVA and calculated Tukey intervals showed significant differences between materials at all time intervals. The results of this study have clinical implications because the sorption and solubility may affect the long-term life expectancy of the soft denture liner.

The Adhesion of Modern Soft Relining Materials to Acrylic Dentures

“…In the oral cavity environment, silicone liners are more resistant to distortion, hardening and debonding from the denture base than acrylic liners [11][12][13]. However, the most common reason for the failure of silicone elastomers under clinical conditions is a loss of adhesion to acrylic resin.…”

Influence of cleansers and a phytotherapic against Candida albicans on the properties of denture liners

“…No differences among groups were observed considering sorption and solubility tests, suggesting that the materials tested appear to have the same performance before and after the treatments, as observed in other studies 11 . These properties have been tested to predict clinical behavior and the longevity of the prosthetic materials 18 since these materials can absorb water or lose soluble components, depending on their composition and the solution in which they are immersed.…”

Efeito da incorporação de agentes antimicrobianos sobre propriedades físicas de materiais resilientes temporários para base de prótese

“…A remoção do contato do biofilme das bases acrílicas com os tecidos de suporte das próteses por meio de reembasamento tem sido relatada como eficaz para romper o ciclo de reinfecção por Candida e reduzir o trauma causado por essa superfície contaminada, auxiliando o tratamento da estomatite protética (HOLMBERG, 1980;MARIN ZULUAGA;GOMEZ VELANDIA;RUEDA CLAUIJO, 2011;MEDEIROS;PACHECO, 2000). Se realizado com materiais resilientes, o reembasamento ainda favorece a recuperação dos tecidos injuriados e promove conforto ao paciente (BROWN, 1988;FARRELL, 1975 WATKINSON, 1988;LEITE et al, 2010;PAVAN et al, 2007;PISANI et al, 2010;POLYZOIS et al, 2013 SAHIN, 1999;HAYAKAWA et al, 1997;KAWANO et al, 1994;MANCUSO et al, 2009;PARKER;BRADEN, 1989;PISANI et al, 2010 VAN NOORT, 1985;MARK SALTZMAN et al, 1993). Todos esses mecanismos possivelmente contribuíram para o aumento da solubilidade com a adição de cetoconazol ao Trusoft e Softone.…”

“…Sorção refere-se à ação simultânea da absorção de líquidos do meio circundante para o interior do material por difusão, preenchendo os espaços vazios entre as cadeias polímeras e da adsorção, representada por sua vez, pela adesão física ou ligação de íons e moléculas na superfície do mesmo (KAWANO et al, 1994;LEÓN;RODRIGUES GARCIA, 2005). Já o mecanismo de solubilidade nos materiais resilientes envolve a perda simultânea do agente plastificante e outros componentes solúveis como álcool etílico para o meio circundante (GRAHAM; JONES; SUTOW, 1991;KAZANJI;WATKINSON, 1988;PARKER;BRADEN, 1989;WRIGHT;CLARK;HARDIE, 1985).…”

“…O meio aquoso torna esses materiais susceptíveis aos processos de sorção e solubilidade, o que interfere com suas propriedades físico-químicas, resultando em alterações dimensionais, aumento na dureza e rugosidade e degradação superficial (KAWANO et al, 1994). Assim, tais processos comprometem a longevidade dos materiais em detrimento da perda de sua resiliência e capacidade de absorção de impactos, o que reduz o conforto proporcionado pelos mesmos (GRONET; DRISCOLL; HONDRUM, 1997; QUDAH;…”