Biomedical subjects
Publications and source records attributed to O W Rogers.
The use of gold electroforms provides (1) a porcelain jacket crown and adaptable gold margin; (2) a matrix for porcelain inlays; (3) an adaptable margin for cast ceramic bonded to metal crowns or abutments. Further, by the application of electrodeposited tin to the gold, excellent bonding of porcelain occurs. This system can be used advantageously as a substrate for bonding porcelain to metals.
A technique has been developed and described for the examination of the interface between dissimilar metals, utilizing electrolytic etching and gold electro-deposition procedures. This procedure permitted etching of both the constituents of the silver solder-stainless steel interface without differential leveling. The grain boundaries at the surface of the stainless steel interface were accentuated by the chemical action of the flux during the joining procedure and the notched grain boundaries influenced the nucleation of the silver solder. No evidence of alloying was found within the resolution of the instruments used.
The results obtained using single impulse and multiple impulse welds for joining orthodontic band and wire material showed that the single impulse produced an autogenous nugget of fused parent material and several nuggets were formed with the multiple impulse weld. Excessive current was deleterious.
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The information obtained from the metallographic procedure used in this paper, as compared with techniques of the past, indicates that certain subgroups such as pinhole porosity, microporosity and subsurface porosity require re-evaluation.
With soldering the physical properties of the basis metal must be maintained and a minimum of molten metal is used. An examination of joints in 17 gauge platinized gold wire is made with 18 k gold solder following quenching immediately after flow and cooling in air; there is a widening of grain boundaries and intergranulation penetration in the latter method. A comparison with the cast gold joint is made. Some inclusions were noted.
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A comparison is made of several types of treatment of the surface of gold which will promote greater bonding with polycarboxylate cement.
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