TY - JOUR
TI - Effect of silane reaction time on the repair of a nanofilled composite using tribochemical treatment
AU - Pilo, R.
AU - Brosh, T.
AU - Geron, V.
AU - Levartovsky, S.
AU - Eliades, G.
JO - Journal of Adhesive Dentistry
PY - 2016
VL - 18
TODO - 2
SP - 125-134
PB - Quintessence Publishing Co, Inc
SN - 1461-5185
TODO - 10.3290/j.jad.a35907
TODO - aluminum;  bisphenol A bis(2 hydroxypropyl) ether dimethacrylate;  dental material;  Filtek Supreme;  nanocomposite;  resin;  resin cement;  silane derivative;  silicon;  Visio-Bond;  water, chemistry;  dental bonding;  dental etching;  human;  infrared spectroscopy;  materials testing;  mechanical stress;  procedures;  scanning electron microscopy;  shear strength;  spectrometry;  surface property;  temperature;  time factor, Aluminum;  Bisphenol A-Glycidyl Methacrylate;  Composite Resins;  Dental Bonding;  Dental Etching;  Dental Materials;  Humans;  Materials Testing;  Microscopy, Electron, Scanning;  Nanocomposites;  Resin Cements;  Shear Strength;  Silanes;  Silicon;  Spectrometry, X-Ray Emission;  Spectroscopy, Fourier Transform Infrared;  Stress, Mechanical;  Surface Properties;  Temperature;  Time Factors;  Water
TODO - Purpose: To investigate the influence of silane reaction time on the repair strength of an aged nanofilled composite and to characterize the bonding mechanism. Materials and Methods: Nanofilled composite disks (n = 110, Filtek Supreme XT) were aged for 90 days in water. After tribochemical treatment (CoJet-Sand), the specimens were assigned to 5 groups (n = 22), primed with silane (Espe-Sil), and left to react for 1, 2, 3, 4, and 5 min. A thin layer of adhesive (Visio-Bond) was applied and a new composite with the same dimension was placed and cured. Non-aged specimens immediately layered and cured using the incremental technique served as controls. After aging (30 days in water plus 5000 thermal cycles), the interface was subjected to a shearing force until failure. Failure mode was evaluated under a stereomicroscope and scanning electron microscopy (SEM). Additional aged and treated surfaces were evaluated for morphology as well as elemental and molecular composition using SEM/EDX and ATR-FTIR. Results: The mean shear bond strength (SBS) of the repaired specimens was 53.9 ± 8.6 MPa, with no significant difference among the various reaction times, but significantly lower compared to the control (88.1 ± 12.5 MPa). Tribochemical treatment created an irregular surface morphology with particles imbedded in the aged surface. Interfacial SEM/EDX analysis showed a 5-μm non-uniform high atomic number zone rich in Al and Si. Conclusion: Tribochemical treatments for repairing composite using a short silane reaction period (1 min) are equally effective as the prolonged reaction periods (2 to 5 min), yielding interfacial shear strength of ~60% of unrepaired material.
ER -