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Results for “ACRYLIC RESINS”

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At least 1,027 records · Page 57Linked to original sources
PubMed1996

Effect of powder-to-liquid ratio on the distortion of repaired denture acrylic resin.

The aim of this study was to determine the distortion of repaired autopolymerising poly(methylmethacrylate) (PMMA) resin. Eighteen rectangular test specimens with a 45-degree edge profile repair surface were repaired with autopolymerising PMMA using different powder-to-liquid (PL) ratios. None of the test specimens distorted during repair, although microscopical examination showed porosities which may have been due to polymerisation shrinkage. The results suggest that autopolymerising PMMA with various PL ratios can be used to repair fractured pieces of PMMA without affecting the distortion of the specimen.

Denture Repair↗
PubMedDate not supplied

The effects of polymerization temperature on the acrylic resin denture base-tooth bond.

The effect of different polymerization temperatures on the bond strength and the type of bond failure between denture base polymers and polymer teeth were investigated using two autopolymerized and one heat-polymerized denture base material. For this purpose, a peel test and a shear test were used. The strongest bond strengths occurred between the heat-polymerized denture base polymer and the polymer teeth. Autopolymerized denture base polymers showed lower bond strengths. With increasing temperatures, the bond strength of the autopolymerized systems increased and the bonding characteristics changed from adhesive to cohesive failure, particularly at temperatures above 50 degrees C.

Analysis of Variance↗
PubMedDate not supplied

A key factor in modern protection of historic buildings: the assessment of penetration of water-repellent polymers into porous stone-materials.

From the 1960s on, the conservation of monuments and stone masonry has witnessed an increasing use of polymeric products during restoration interventions. Actual penetration depths reached by different polymers within the porous stone matrix are supposed to be key factors in determining the efficacy of the treatments themselves (besides, of course, the chemical-mineralogical nature of the stone and the chemical-physical characteristics of the various polymers). This work presents some preliminary results obtained on specimens of Noto calcarenite treated with various polymeric protective products. Samples were investigated with direct analytical methods (micro-ATR spectroscopy, SEM) in order to assess penetration depths reached by polymers inside the stone while reducing to a minimum the necessary manipulation of specimens. The obtained results highlighted the following trend in penetration depths for the various products tested: siloxane product > partially fluorinated acrylic resin > acrylic resin. Moreover, data obtained allowed to establish direct correlation between long term efficacy of products and relative penetration depths.

Acrylates↗