Failure probability of implant-supported restorations using highly filled all-composite crowns.
OBJECTIVE
To evaluate the effect of the surface preparation of a gold cylinder on the failure probability of highly filled all-composite restorations used as implant-supported prostheses, and to determine the effect of the location of load application.


METHODS
Gold cylinders (Nobel Biocare) were prepared with 1 of 4 different surface preparations (n = 20 per surface treatment), and then an indirect resin composite (Targis, Ivoclar Vivadent) was applied. The 4 surface treatment conditions were (1) untreated (prep 1); (2) airborne-particle abraded with 50-Microm alumina (prep 2); (3) airborne-particle abraded with 50-Microm alumina followed by application of a metal conditioner (Alloy Primer, J. Morita) (prep 3); and (4) airborne-particle abraded with 50-Mum alumina followed by application of the bonding primer for the indirect resin system (Targis Link) (prep 4). A compressive load was applied vertically at 1 mm and 2 mm from the access cavity on the occlusal surface until the restorations failed.


RESULTS
The prep 4 specimens had the highest fracture resistance. The fracture resistance at the 1-mm location was significantly higher than that at the 2-mm location. The failure load of the all-composite restorations with any of the surface preparations was lower than that of the resin-veneered restorations used as controls.


CONCLUSIONS
The prep 4 conditions decreased the probability of fracture of the highly filled all-indirect resin composite restorations. Eccentric loading of the all-composite restorations should be minimized in light of the higher probability of failure associated with such a loading condition.
Shimizu
Hiroshi
H
Division of Removable Prosthodontics, Department of Oral Rehabilitation, Fukuoka Dental College, Fukuoka, Japan. simizuh1@college.fdcnet.ac.jp <simizuh1@college.fdcnet.ac.jp>
Hisama
Kazuhiro
K
Kurtz
Kenneth S
KS
Takahashi
Yutaka
Y
Sato
Hironobu
H
D020906:Air Abrasion, Dental; D003188:Composite Resins; D019245:Compressive Strength; D003442:Crowns; D045662:Dental Etching / Q000379:methods; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006047:Gold Alloys; D008422:Materials Testing; D019279:Resin Cements; D013499:Surface Properties
D003188:Composite Resins; D006047:Gold Alloys; D019279:Resin Cements