Abstract | PURPOSE: To develop a laboratory model aimed at duplicating the failure process of post and core restorations. The load pattern applied was to be repetitive ( fatigue) and multivectorial. To determine and compare the resistance under fatigue loading of seven endodontic post/natural root combinations: stainless steel-, titanium-, ceramic-, composite-fiber/epoxy-, two glass-fiber/epoxy- and glass-fiber/acrylic posts. MATERIALS AND METHODS: The repetitive, alternating and multivectorial intraoral force pattern was reproduced by subjecting the specimens to the rotating cantilever beam test. To this end, the samples were designed as rotation-symmetric structures comprising a root, a post, periodontal ligament- and bone analogs and a restoration analog. The following posts were tested: Unimetric-Ti, Unimetric-SS, Biopost, Composipost, Easypost, DT Lightpost, Everstickpost. The samples were spun around their long axes while being clamped into a revolving collet on one end and loaded normal to their long axis on the other end. The aim was to determine the load level at which 50% of the specimens survived- and 50% fractured before 10E6 cycles. The 50% means were determined using the staircase procedure. RESULTS: In increasing order of magnitude, the resistances to fatigue loading were as follows: Biopost, Unimetric-Ti, Unimetric-SS, Composipost, Easypost, Everstickpost, DT Lightpost. SIGNIFICANCE: The fatigue resistance of the two fibrous posts with the highest fatigue resistance was twice that of any of the ceramic or metal posts.
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Authors | H W Anselm Wiskott, Malika Meyer, Jean Perriard, Susanne S Scherrer |
Journal | Dental materials : official publication of the Academy of Dental Materials
(Dent Mater)
Vol. 23
Issue 11
Pg. 1412-9
(Nov 2007)
ISSN: 0109-5641 [Print] England |
PMID | 17267029
(Publication Type: Comparative Study, Journal Article)
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Chemical References |
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Topics |
- Ceramics
- Composite Resins
- Dental Restoration Failure
- Dental Stress Analysis
- Metals
- Models, Dental
- Post and Core Technique
- Rotation
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