Affiliation
Materials Science Unit, Division of Oral Biosciences, Dublin Dental School & Hospital, Trinity College Dublin, Lincoln Place, Dublin 2, Ireland. giuseppe.isgro@dental.tcd.ieIssue Date
2010-01MeSH
Analysis of VarianceCrowns
Dental Bonding
Dental Cements
Dental Marginal Adaptation
Dental Polishing
Dental Porcelain
Dental Restoration Failure
Dental Restoration, Permanent
Dental Stress Analysis
Elasticity
Humans
Materials Testing
Statistics, Nonparametric
Stress, Mechanical
Tensile Strength
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Deformation of a dental ceramic following adhesive cementation. 2010, 89 (1):87-90 J. Dent. Res.Journal
Journal of dental researchDOI
10.1177/0022034509354049PubMed ID
19948940Abstract
Stress-induced changes imparted in a 'dentin-bonded-crown' material during sintering, annealing, pre-cementation surface modification, and resin coating have been visualized by profilometry. The hypothesis tested was that operative techniques modify the stressing pattern throughout the material thickness. We polished the upper surfaces of 10 ceramic discs to remove surface imperfections before using a contact profilometer (40-nm resolution) to measure the 'flatness'. Discs were re-profiled after annealing and after alumina particle air-abrasion and resin-coating of the 'fit' surface. Polished surfaces were convex, with a mean deflection of 8.4 + or - 1.5 microm. Mean deflection was significantly reduced (P = 0.029) following alumina particle air-abrasion and increased (P < 0.001) on resin-coating. Polishing induced a tensile stress state, resulting in surface convexity. Alumina particle air-abrasion reduced the relative tensile stress state of the contralateral polished surface. Resin-polymerization generated compression within the resin-ceramic 'hybrid layer' and tension in the polished surface and is likely to contribute to the strengthening of ceramics by resin-based cements.Item Type
ArticleLanguage
enISSN
1544-0591ae974a485f413a2113503eed53cd6c53
10.1177/0022034509354049
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