Influence of fatigue testing and cementation mode on the load-bearing capability of bovine incisors restored with crowns and zirconium dioxide posts.
The aim of the study was to evaluate the influence of fatigue and cementation mode on the fracture behavior of endodontically treated bovine incisors restored with zirconium dioxide posts and crowns. Forty-eight endodontically treated bovine primary incisors were restored with zirconium dioxide posts (Cerapost, Brasseler), composite build-ups, and crowns cast from a chromium cobalt alloy. In 16 teeth, each of the posts was cemented conventionally with KetacCem (3M ESPE) or adhesively with Panavia F (Kuraray) or RelyX UniCem (3M ESPE). One-half of the specimens in each group were subjected to thermocycling with 10,000 cycles at 5-55 degrees C and mechanical aging, loading the specimens at an angle of 45 degrees in 1,200,000 cycles with 50 N. Fracture resistance was determined by loading the specimens until fracture at an angle of 45 degrees to the long axis of the teeth. The loading test showed that neither cementation mode nor fatigue testing had an influence on the load bearing capability. Most specimens fractured in a favorable way, independent from the type of cementation.
Department of Prosthetic Dentistry and Dental Materials Sciences, Dental School and Clinics, Saarland University, Homburg Campus, Bldg. 71.2, 66421, Homburg/Saar, Germany. zmkfnot@uniklinikum-saarland.de
F P
FP
Nothdurft
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T
Schmitt
P J
PJ
Motter
P R
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Pospiech
D000818:Animals; D002417:Cattle; D002484:Cementation / Q000379:methods*; D002858:Chromium Alloys; D003188:Composite Resins; D003442:Crowns; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D007180:Incisor / Q000502:physiology; D008277:Magnesium Oxide; D011076:Polycarboxylate Cement; D011176:Post and Core Technique; D019279:Resin Cements; D014082:Tooth Fractures / Q000517:prevention & control*; D015034:Zinc Oxide; D015040:Zirconium
D002858:Chromium Alloys; D003188:Composite Resins; D005899:Glass Ionomer Cements; C438843:Panavia-Fluoro; D011076:Polycarboxylate Cement; C483701:Rely X Unicem; D019279:Resin Cements; D003776:Dental Porcelain; D008277:Magnesium Oxide; C040235:Ketac-cem; D015040:Zirconium; C028541:zirconium oxide; D015034:Zinc Oxide