Deformation of a dental ceramic following adhesive cementation

Journal of Dental Research
Giuseppe IsgròG J P Fleming

Abstract

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.

References

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Citations

May 23, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Gergo MitovPeter Pospiech
May 19, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Liliana G MayThomas Hill
Nov 9, 2010·Journal of Dentistry·G IsgróG J P Fleming
May 9, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Garry J P FlemingOwen Addison
Jan 3, 2015·Journal of Dentistry·Anna Karina F CostaOwen Addison
Nov 21, 2018·Dental Materials : Official Publication of the Academy of Dental Materials·Dan L RomanykOwen Addison
Aug 14, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Saori KimuraTakatsugu Yamamoto

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