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   Deformation of a dental ceramic following adhesive cementation  
   
نویسنده isgró g. ,addison o. ,fleming g.j.p.
منبع journal of dental research - 2010 - دوره : 89 - شماره : 1 - صفحه:87 -90
چکیده    Stress-induced changes imparted in a dentin-bondedcrowng 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 fitg surface. polished surfaces were convex,with a mean deflection of 8.4 ± 1.5 1/4m. 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 layerg and tension in the polished surface and is likely to contribute to the strengthening of ceramics by resin-based cements.
کلیدواژه Air abrasion; Ceramic discs; Deflection test; Dental; Residual stress; Resin.
آدرس division of oral biosciences,dublin dental school and hospital,trinity college dublin,lincoln place,dublin 2, Ireland, biomaterials unit,school of dentistry,university of birmingham,birmingham b4 6nn, United Kingdom, division of oral biosciences,dublin dental school and hospital,trinity college dublin,lincoln place,dublin 2, Ireland
 
     
   
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