Biomedical subjects

R Guggenberger

Publications and source records attributed to R Guggenberger.

3 recordsLinked to original sources

PubMed2000

Exploring beyond methacrylates.

PURPOSE: This article focuses on the polymerization shrinkage of current dental composites as their major disadvantage and to find new routes for a solution. MATERIALS AND METHODS: A brief introduction describes selected methods for the shrinkage determination as well as some principal solutions to overcome the shrinkage problem. RESULTS: Siloranes, a new class of ring opening monomers, are presented as a promising resin matrix for dental composites. The synthesis of these monomers, and further consequences of the new chemistry for the formulation are discussed. Two selected silorane composites are presented with their mechanical data and their volume shrinkage.

Bisphenol A-Glycidyl Methacrylate↗

PubMed1998

New trends in glass-ionomer chemistry.

This paper surveys the different routes to develop glass-ionomer cements (GICs) (glass polyalkenoate cements). Using a new commercially available material, Ketac-Molar, the particular ways of improving conventional GICs are described (mainly optimizing the concentration and molecular weight of the polyacid as well as the particle size distribution of the glass). High cross-linkage in the GIC matrix is the key issue to achieve superior physical properties (three- body wear resistance, compressive and flexural strength, surface hardness and solubility). This is proven by differential scanning calorimetry and infrared spectroscopy.

Biocompatible Materials↗

PubMed1989

[Rocatec system--adhesion by tribochemical coating].

The Rocatec procedure as a novel acrylic/metal bonding system is presented. This procedure is based on the tribochemical application of a layer of a ceramic bonding agent by sand blasting, followed by the application of a silane solution. Its particular advantages are the speed and accuracy of coating, the fact that the adhesive layer can be visually checked, and that thermal stresses to the metallic framework are avoided. Shear/compression and tensile tests reveal increased bonding strength values with the Rocatec bonding system than with mechanical bead retention, even after thermocycling and storage in water for one year.

Acrylic Resins↗