The influence of different cementation modes on the fracture resistance of feldspathic ceramic crowns.
One hundred twenty pressed feldspathic ceramic crowns were luted to 20 steel dies using six different cementation modes. Fracture resistance was tested under an angle of 45 degrees and was determined as the maximal fracture load. Crowns were tested with luting agent only (groups A and C) and after etching with hydrofluoric acid, silanating, and the application of a bonding agent (groups B, D, E, and F). The resulting means were: phosphate cement 294.3 (A) and 282.2 (B); glass-ionomer cement 217.2 (C) and 255.4 (D); resin composite 382.2 (E) and 687.6 (F). Statistical analysis revealed significantly greater fracture resistance (P < .01) of resin luted crowns. Bonding to the die almost doubled the fracture resistance. Conditioning of the inner surfaces of the crowns did not improve the fracture resistance of crowns luted using zinc phosphate or glass-ionomer cements.
Groten
M
M
Department of Prosthodontics, University of Tübingen Dental Clinic, Germany.
Pröbster
L
L
D000179:Acrylates; D000538:Aluminum Silicates; D002484:Cementation / Q000379:methods*; D003442:Crowns; D003738:Dental Cements / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D008277:Magnesium Oxide; D008422:Materials Testing; D011076:Polycarboxylate Cement; D012821:Silanes; D018709:Statistics, Nonparametric; D015034:Zinc Oxide; D015036:Zinc Phosphate Cement
D000179:Acrylates; D000538:Aluminum Silicates; D003738:Dental Cements; C075815:IPS-Empress ceramic; D011076:Polycarboxylate Cement; C076811:Rocatec; D012821:Silanes; D003776:Dental Porcelain; C069103:Dual Cement; D008277:Magnesium Oxide; D015036:Zinc Phosphate Cement; C040415:heliobond; C040235:Ketac-cem; C086629:Phosphacap; D015034:Zinc Oxide