Investigation into the bond strength of four ceramo alloy systems related to two different cooling methods
Date
1981
DOI
Authors
Spielmann, Hans-Peter
Version
OA Version
Citation
Abstract
Treatments and preparations of ceramo-alloy systems prior to porcelain bonding has been a conflicting controversy among technologists, researchers and manufacturers. The literature is replete with theories about the natures of the bond between porcelain and ceramo-alloys. The role of specific elements in the bonding is still unknown. The purpose of this investigation was to gain additional insight into a specific aspect of cooling and subsequent bonding.
This study was conducted to investigate as to whether quenching of a ceramo-alloy after casting does effect the bonding at the ceramo-metal interface. It was speculated that the specific cooling method prior to the metal surface preparation and porcelain application would affect the micro- structure will special reference to the elements at the surface which, in turn, affects the bonding of porcelain to the alloy.
Four ceramo-alloys, a Gold-Platinum, Gold Palladium, Palladium-Cobalt-Indium, and a Nickel-Chromium alloy, were divided into two groups, totaling 80 specimens. One group was subjected to immediate quenching after casting of the specimens in the ceramo-alloy. The second group was left to bench cool at room temperature, served as a control group. Porcelain was applied to the thus-treated specimens. Each alloy received its appropriate porcelain as recommended by the manufacturer, to provide maximum bond strength.
After the porcelain was applied and fired, the specimens were subjected to a shear test. They were loaded under compression using a crosshead speed of 0.05 inch per minute. The load at failure (peak load in pounds) was recorded.
Analysis of the data demonstrated the following:
1. No significant trend, indicating that either quenching or bench cooling, affect the bonding for the alloys Jelenko "O", Olympia and Chemodent.
2. For the alloy Biobond, a significant difference was observed (p[less than] 0.02).
3. There is a direct relationship of the quenching treatment itself. A significant variation exists between the bond strength among the four alloy systems in Group I.
4. The variation in the results in the bond strength was due to porcelain opaque porosity.
During the course of this investigation, valuable information was also collected with respect to testing and specimens fabrication and variables affecting the results.
The reader is encouraged to critically study these findings, and to either accept, reject or dispute the results. Only this approach will be beneficial to the dental profession.
Description
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Colored photographs included.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1981 (Dental Public Health)
Bibliography : leaves 61-64.
Colored photographs included.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1981 (Dental Public Health)
Bibliography : leaves 61-64.
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.