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PubMedDate not supplied

In vivo registration of force development with ceramic and acrylic resin occlusal materials on implant-supported prostheses.

PURPOSE: It has been hypothesized that the shock generation on implant-supported prostheses during chewing should generate higher implant loads if the veneering material is porcelain rather than acrylic resin. MATERIALS AND METHODS: The present study uses strain-gauged abutments to measure the force transferred to the implant after a shock has been applied. This was measured in vitro and in vivo in 5 patients. RESULTS: The different occlusal materials did not lead to different forces generated to the implants of the patients. DISCUSSION: From a practical point of view, the choice of occlusal material has no bearing per se on force generation to the implants. CONCLUSIONS: The present study demonstrated that there: (a) is a difference in resilience between acrylic resin and ceramic veneering materials, but (b) this difference is only measurable in in vitro where the force is generated by a shock only and the implant is rigidly anchored.

Adult↗
PubMed1989

Complete denture retention. Part II: Wettability studies on various acrylic resin denture base materials.

The objective of this study was to characterize in vitro selected acrylic resin denture base materials by water-contact angle measurements. The sessile drop method and the underwater-bubble method were used. The results obtained from these measurements are discussed in terms of contact angle and polymer-water work of adhesion hysteresis. On polished heat-polymerized samples this hysteresis results from the reorientation of superficial polymer chains. The combined effect of increased sample roughness and of the entrapment of water droplets in the pores of material gives rise to the highest contact-angle hysteresis observed on sand-abraded samples. On the basis of physical analysis of the mechanism involved in complete denture retention, developed in Part I of this work, it is believed that the sand-abraded material is the most convenient for the retention of the complete denture.

Acrylic Resins↗
PubMed1999

A method of predicting color stability of autopolymerizing acrylic resins using electron spin resonance.

Synopsis. Long periods can be required to determine the color stability of acrylic resins. The concentration of propagating radicals with unpigmented experimental resins (UER) and initiator solution (IS) of two initiator systems (binary and ternary) and five products were measured using electron spin resonance (ESR). The radical concentration was estimated from the area under the integrated ESR spectrum. The discoloration was measured using a color computer. Higher content of benzoylperoxide led to higher radical concentrations. The radical concentration for the ternary system increased slightly with time, but were lower than those of the binary system. Significant positive correlations were found between the radical concentration and delta E*ab for UER (r = 0.900, p < 0.01), IS (r = 0.953, p < 0.001) and the products (r = 0.808, p < 0.05). It was suggested that the color stability of these resins was predictable by measuring the radical concentration using ESR.

Acrylic Resins↗
PubMed1996

The effect of modification of acrylic resins on controlled release and bioadhesion.

The effect of various treatments on the properties of an acrylic matrix was studied, in terms of its swelling properties in buffer solution. The release of two types of drugs from those matrices and their bioadhesive character were also considered. Calcium stearate and sodium lauryl sulfate were used as additives for the matrix treatment. 2-Hydroxyethyl methacrylate was also used as a reactive agent for the acrylic resin treatment. The main function of the above chemicals is the modification of the hydrophilic/hydrophobic character of the matrix. This investigation showed that controlled release systems can be designed by adjusting the matrix properties via additives or chemical reaction.

Acrylic Resins↗