Bond strength and candidal growth inhibition of the VLC soft liners in comparison to silicone and acrylic soft liners

The purpose of the present work was to compare bonding of the visible light-curved VLC soft liners to denture base resin with that of silicone and acrylic soft liners to denture base resin. Another purpose to study the effect of the studied soft lining materials on Candida albicans growth. Specimens were prepared from denture base resin bonded to the different denture soft liners. An Instron universal testing machine was used to measure the tensile failure of the different specimens. Other specimens from the different materials were prepared and were cultured with isolated Candida albicans. The percentage of growth inhibition of Candida albicans was compared. The results showed that the heat-cured silicone soft liner had the highest bonding values to denture base resin, followed by the two tested VLC soft liners. It was also shown that the self-cured acrylic soft liner had the highest inhibition values of Candida albicans growth while the silicone material had the lowest inhibition values of Candida albicans growth

Water sorption and diffusion kinetics of soft liners and denture base materials

The aim of this study was to characterize water sorption, desorption anddiffusion kinetics, at room temperature and at body temperature, for acrylic,and silicone soft lining materials and also, for comparative evaluation, ofacrylic [hard] denture base materials. The results showed that the watersorption and diffusion rate of the silicone soft lining materials werestatistically different from those of the hard acrylic denture base materials,while the rate of diffusion and those equilibration values for the acrylicsoft lining materials were close to that of the acrylic denture base materials

Residual monomer in acrylic soft lining materials

The purpose of this study was to estimate the extent of polymerization of heatand self cured acrylic soft lining materials. This objective was carried outby comparing the glass transition temperature Tg of heat cured and self curedsamples of specially prepared model systems to the expected glass transitiontemperature of their composition. The results showed that there was adifference in the Tg value according to the curing method. Also, thepercentage of residual monomer of the self cured soft lining model systems washigher than that of the hard acrylic model system. It was concluded that thepresence of plasticizers in high concentrations interfere with polymerization

Effect of complete denture on taste and temperature sense

Twenty-two recently edentulous patients were selected for the present study. Complete dentures were fabricated for each patient in the regular way. Different concentrations of four basic modalities of taste [sweet, salt, sour and bitter] were used at different temperatures. Forced three drop's technique was applied to the tongue with and without denture. It was found that all subjects with dentures, exhibited higher taste thresholds and lower temperature sense, for each taste modality, especially for bitter and sour. It was concluded that wearing complete denture affects taste and temperature sense for certain types of food more than other types

Occlusal splint therapy in the treatment of myofascial pain dysfunction syndrome, and associated muscles

Three different full coverage types of occlusal devices were used in the present study to evaluate their effects on patients with myofacial dysfunction syndrome [MPD]. It was found that the hard acrylic device had more significant therapeutic effect for relieving pain of TMJ and masticatory muscles compared with soft resilience and combination [hard and soft] devices. On the other hand, no one of these devices had a significant effect on the elimination of TMJ clicking at the end of final evaluation period