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Influence of ageing on self‐etch adhesives: one‐step vs. two‐step systems
Author(s) -
Marchesi Giulio,
Frassetto Andrea,
Visintini Erika,
Diolosà Marina,
Turco Gianluca,
Salgarello Stefano,
Di Lenarda Roberto,
Cadenaro Milena,
Breschi Lorenzo
Publication year - 2013
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12009
Subject(s) - adhesive , bond strength , materials science , single bond , molar , one step , composite material , dentistry , chemistry , medicine , chemical engineering , group (periodic table) , organic chemistry , layer (electronics) , engineering
The aim of this study was to evaluate microtensile bond strength ( μ TBS ) 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 μ TBS 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 μ TBS 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 μ TBS 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.