title: Immediate and 24-hour evaluation of the interfacial strengths of fiber posts.
abstract: This study examined the contribution of testing time on the interfacial strengths of fiber posts to radicular dentin. Twenty-five fiber posts were luted to root segments with resin cements and a zinc phosphate cement. Immediately upon setting of the materials, the roots were sectioned into slices and randomly divided into two subgroups, depending on testing time (immediate vs. 24-hours), for push-out test. The results showed an improvement on the interfacial strength after 24 hours of storage. When data were pooled for each cement, the interfacial strengths (MPa) were: Optibond Solo Plus/Nexus: 10.3+/-3.8a; zinc phosphate cement: 10.1+/-2.7a; Multilink: 9.6+/-3.8ab; RelyX Unicem: 7.1+/-4.9bc; AllBond 2/Duolink: 6.7+/-3.5c (groups with same superscript letter were not statistically significant). It is concluded that bond strength can increase during the first 24 hours and that the interfacial strength is predominantly contributed by frictional retention.
authors.affiliation: Department of Dental Materials, School of Dentistry, University of Siena, Italy. fernandasadek@gmail.com
authors.forename: Fernanda Tranchesi
authors.initials: FT
authors.lastname: Sadek
authors.forename: Cecilia
authors.initials: C
authors.lastname: Goracci
authors.forename: Francesca
authors.initials: F
authors.lastname: Monticelli
authors.forename: Simone
authors.initials: S
authors.lastname: Grandini
authors.forename: Alvaro Hafiz
authors.initials: AH
authors.lastname: Cury
authors.forename: Franklin
authors.initials: F
authors.lastname: Tay
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D017276:Friction; D005898:Glass; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013997:Time Factors; D015036:Zinc Phosphate Cement
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements; C009753:fiberglass; D015036:Zinc Phosphate Cement