title: Compressive stress-strain behaviour of cast dental restorations in relation to luting cement distribution.
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.
authors.affiliation: University of Edinburgh, Postgraduate Dental Institute, Edinburgh, UK. S0096711@sms.ed.ac.uk
authors.forename: S
authors.initials: S
authors.lastname: Asbia
authors.forename: R
authors.initials: R
authors.lastname: Ibbetson
authors.forename: R L
authors.initials: RL
authors.lastname: Reuben
mesh_terms: D001696:Biomechanical Phenomena; D019245:Compressive Strength; D003442:Crowns; D001840:Dental Bonding; D003763:Dental Leakage; D017267:Dental Prosthesis Design / Q000295:instrumentation*; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D003765:Models, Dental; D013314:Stress, Mechanical; D013718:Tensile Strength; D016474:Weight-Bearing; D015036:Zinc Phosphate Cement
chemical_list: D015036:Zinc Phosphate Cement