Micro push-out bond strengths of 2 fiber post types luted using different adhesive strategies.
OBJECTIVE
The objective of this study was to evaluate the push-out bond strengths of carbon and glass fiber posts adhesively luted with Panavia F 2.0 and RelyX Unicem luting cements, as well as a modified application procedure using RelyX Unicem cement in combination with a single-bottle total-etch adhesive in 3 segments of teeth.


METHODS
Sixty single-rooted human maxillary central incisors and canines were sectioned below the cementoenamel junction, and the roots were endodontically treated. The roots were divided into 2 fiber-post groups, and then divided into 3 subgroups of 10 specimens each to test different luting strategies. Bonded specimens were cut (1-mm-thick sections) and push-out tests were performed (crosshead-speed, 0.5 mm/min). Failure modes were evaluated using a stereomicroscope at original magnification ×40.


RESULTS
Micro push-out bond strengths were significantly affected by the type of luting agent and the type of post (P < .05). In all root sections, the push-out bond strength values of glass fiber posts were significantly higher than that of carbon fiber posts (P < .05). Moreover, the highest push-out bond strengths were measured for Panavia F 2.0 and RelyX Unicem cements. These values were significantly higher than that of modified application procedure in the medium section for both glass- and carbon-fiber posts, and in the apical root sections only for glass-fiber post (P < .05). In each region, the modified application procedure showed the lowest bond strength values. Adhesive failure between dentin and cement was the most frequent type of failure.


CONCLUSIONS
In all root segments, the glass fiber post provided significantly increased post retention compared with the carbon fiber post, regardless of the luting strategy used.
Erdemir
Ugur
U
Department of Operative Dentistry, Faculty of Dentistry, Istanbul University (34300) Capa, Istanbul, Turkey. uerdemir@hotmail.com
Mumcu
Emre
E
Topcu
Fulya Toksoy
FT
Yildiz
Esra
E
Yamanel
Kivanc
K
Akyol
Mesut
M
D002244:Carbon; D000077482:Carbon Fiber; D003188:Composite Resins; D003481:Cuspid; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D005898:Glass; D006801:Humans; D007180:Incisor; D015999:Multivariate Analysis; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements; D018709:Statistics, Nonparametric
D000077482:Carbon Fiber; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C009753:fiberglass; D002244:Carbon