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- Title
Compressive stress-strain behaviour of cast dental restorations in relation to luting cement distribution.
- Authors
Asbia, S.; Ibbetson, R.; Reuben, R. L.
- Abstract
This work is concerned with the performance, under dynamic compression, of the adhesives used to simulate cementation of gold crowns onto nickel chromium dies. A measurement system, based on the mounting of strain gauges onto the outer surface of the crowns, has been developed, which allows a semi-quantitative estimate of the state of adhesion. A preliminary study was carried out where miniature gauges were bonded onto the buccal, lingual, mesial and distal surfaces of gold crowns cast to fit onto a chromium-cobalt die, as a precursor to the final design of the instrumented crown. The crowns were then loaded in compression periodically measuring the strain at all four gauges. The results showed the load-strain relationship in fully, partially and uncemented crowns, along with repeated load-unload behaviour to close to the ultimate strength of the bond. The load-strain relationship is linear and repeatable and the slope varies over a factor of about 30 between the un-cemented and fully cemented crown, demonstrating that there is significant sensitivity to bond integrity. These results were used to determine the parameters for a systematic study of S-N relationships in restorative dentistry crowns.
- Subjects
OPERATIVE dentistry; ADHESIVES in surgery; PROSTHODONTICS; PHYSIOLOGIC strain; STRAIN gages; NICKEL-chromium alloys; SURFACE area
- Publication
Technology & Health Care, 2006, Vol 14, Issue 4/5, p439
- ISSN
0928-7329
- Publication type
Article
- DOI
10.3233/thc-2006-144-524