Adhesive cementation of zirconia posts to root dentin: evaluation of the mechanical cycling effect
Braz. oral res
;
22(3): 264-269, 2008. ilus, graf, tab
Article
in English
| LILACS
| ID: lil-495603
ABSTRACT
This study evaluated the effect of mechanical cycling on the bond strength of zirconia posts to root dentin. Thirty single-rooted human teeth were transversally sectioned to a length of 16 mm. The canal preparation was performed with zirconia post system drills (CosmoPost, Ivoclar) to a depth of 12 mm. For post cementation, the canals were treated with total-etch, 3-steps All-Bond 2 (Bisco), and the posts were cemented with Duolink dual resin cement (Bisco). Three groups were formed (n = 10) G1 - control, no mechanical cycling; G2 - 20,000 mechanical cycles; G3 - 2,000,000 mechanical cycles. A 1.6-mm-thick punch induced loads of 50 N, at a 45° angle to the long axis of the specimens and at a frequency of 8 Hz directly on the posts. To evaluate the bond strengths, the specimens were sectioned perpendicular to the long axis of the teeth, generating 2-mm-thick slices, approximately (5 sections per teeth), which were subjected to the push-out test in a universal testing machine at a 1 mm/min crosshead speed. The push-out bond strength was affected by the mechanical cycling (1-way ANOVA, p = .0001). The results of the control group (7.7 ± 1.3 MPa) were statistically higher than those of G2 (3.9 ± 2.2 MPa) and G3 (3.3 ± 2.3 MPa). It was concluded that the mechanical cycling damaged the bond strength of zirconia posts to root dentin.
Full text:
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Index:
LILACS (Americas)
Main subject:
Zirconium
/
Ceramics
/
Post and Core Technique
/
Dental Bonding
/
Resin Cements
/
Dentin
Limits:
Humans
Language:
English
Journal:
Braz. oral res
Journal subject:
Dentistry
Year:
2008
Type:
Article
Affiliation country:
Brazil
/
Italy
Institution/Affiliation country:
Federal University of Santa Maria/BR
/
São Paulo State University/BR
/
University of Bologna/IT
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