title: Influence of ageing on self-etch adhesives: one-step vs. two-step systems.
abstract: The aim of this study was to evaluate microtensile bond strength (μTBS) to dentine, interfacial nanoleakage expression, and stability after ageing, of two-step vs. one-step self-etch adhesives. Human molars were cut to expose middle/deep dentine, assigned to groups (n = 15), and treated with the following bonding systems: (i) Optibond XTR (a two-step self-etch adhesive; Kerr), (ii) Clearfil SE Bond (a two-step self-etch adhesive; Kuraray), (iii) Adper Easy Bond (a one-step self-etch adhesive; 3M ESPE), and (iv) Bond Force (a one-step self-etch adhesive; Tokuyama). Specimens were processed for μTBS testing after 24 h, 6 months, or 1 yr of storage in artificial saliva at 37°C. Nanoleakage expression was examined in similarly processed additional specimens. At baseline the μTBS results ranked in the following order: Adper Easy Bond = Optibond XTR ≥Clearfil SE = Bond Force, and interfacial nanoleakage analysis showed Clearfil SE Bond = Adper Easy Bond = Optibond XTR> Bond Force. After 1 yr of storage, Optibond XTR, Clearfil SE Bond, and Adper Easy Bond showed higher μTBS and lower interfacial nanoleakage expression compared with Bond Force. In conclusion, immediate bond strength, nanoleakage expression, and stability over time were not related to the number of steps of the bonding systems, but to their chemical formulations.
authors: Department of Medical Sciences, University of Trieste, Trieste, Italy.
authors: Giulio
authors: G
authors: Marchesi
authors: Andrea
authors: A
authors: Frassetto
authors: Erika
authors: E
authors: Visintini
authors: Marina
authors: M
authors: Diolosà
authors: Gianluca
authors: G
authors: Turco
authors: Stefano
authors: S
authors: Salgarello
authors: Roberto
authors: R
authors: Di Lenarda
authors: Milena
authors: M
authors: Cadenaro
authors: Lorenzo
authors: L
authors: Breschi
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000269:Adhesives / Q000737:chemistry*; D000704:Analysis of Variance; D003763:Dental Leakage; D003804:Dentin / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D008964:Molar, Third; D019279:Resin Cements / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000269:Adhesives; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C000212:ammoniacal silver; D012834:Silver