Optical Surface Roughness and Selective Etching of Interdendritic Rexillium III Phases(s),
Abstract
Reflection of light from electrolytically etched casting alloys is empirically related to the incident light angle, viewing and solid cone angles, absorption and the root mean square surface and solid cone angles, absorption and the root mean square surface roughness. These factors were evaluated for the further development of a fiber optic photometer to quantitate base metal etching, Dental laboratory etching variables studied include: current density, sulfuric acid and methanol concentrations, temperature, etch time and aging of the etch solution. Resin tensile bond strengths and reflection values were correlated by regression analysis. Peak light intensity occurs above the angle of incidence. Increasing the viewing solid cone angle enhanced reflection sensitivity. Reflection measurements showed current density, acid concentration, etch time and temperature to be critical in controlling the selective removal of interdendritic phase(s), Bond strength values tended to be related to reflection values for some sets of castings. Bond strength values, however, were much lower overall than expected. A significant relationship between clinically meaningful bond strengths and reflection values remains to be determined. Keywords: Resin bonding; Prostheses; Dental materials; Casting alloys; Electrolytic etching.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1985
- Accession Number
- ADA159949
Entities
People
- J. R. Kelly
- V. P. Thompson