In vitro fracture strength of endodontically treated premolars.
The recent introduction of new bonding agents has led some authors to suggest that certain endodontically treated posterior teeth could be restored with a bonded restoration instead of a full-coverage crown or onlay. To test the fracture resistance of endodontically treated premolars restored with and without bonding agents, we randomly divided 56 intact and caries-free maxillary premolars into seven groups as follows: unaltered teeth; access only; MOD prep and RCT; MOD prep, RCT, and amalgam restoration; MOD prep, RCT, and amalgam with 4-META bonding agent; MOD prep, RCT, and composite resin restoration; and MOD prep, RCT, and composite resin with 4-META bonding agent. The teeth were subjected to compressive fracture tests in a Zwick 1435 Universal Testing Machine. Unaltered teeth and those with access only demonstrated similar fracture strengths. Under the conditions of this study, there was no significant difference in fracture strength between the experimental groups.
Steele
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A
Department of Endodontics (M/C 642), College of Dentistry, University of Illinois at Chicago 60612, USA.
Johnson
B R
BR
D000180:Acrylic Resins; D000704:Analysis of Variance; D001641:Bicuspid / Q000502:physiology*; D003188:Composite Resins; D019245:Compressive Strength; D003723:Dental Amalgam; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D008437:Maxilla; D011897:Random Allocation; D019279:Resin Cements; D012390:Root Canal Therapy; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital / Q000503:physiopathology*
D000180:Acrylic Resins; D003188:Composite Resins; D019279:Resin Cements; D003723:Dental Amalgam; C031172:4-META resin