Effect of experimental silane-based primers with various contents of 2-hydroxyethyl methacrylate on the bond strength of orthodontic adhesives

Authors

  • Ammar A. Mustafa,

    Corresponding author
    1. Faculty of Dentistry, Department of Dental Materials Science, International Islamic University Malaysia, Kuantan, Pahang, Malaysia
    • Correspondence

      Assistant Professor, Dr Ammar. A. Mustafa, Faculty of Dentistry, Department of Dental Biomaterials, International Islamic University Malaysia, Kuantan Campus, Bandar Indera Mahkota, Jalan Sultan Ahmad Shah, 25200 Kuantan, Pahang, Malaysia.

      Tel: +60199202975

      Emails: drammar@iium.edu.my; drammar71@gmail.com

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  • Jukka P. Matinlinna,

    1. Faculty of Dentistry, Department of Dental Materials Science, The University of Hong Kong, Hong Kong, China
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  • Aziz A. Razak,

    1. Faculty of Dentistry, Biomaterials and Technology Unit, University of Malaya, Kuala Lumpur, Malaysia
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  • Akbar S. Hussin

    1. Faculty of Dentistry, Department of Orthodontics, International Islamic University Malaysia, Kuantan, Malaysia
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Abstract

Aim

To evaluate in vitro the effect of different concentrations of 2-hydroxyethyl methacrylate (HEMA) in experimental silane-based primers on shear bond strength of orthodontic adhesives.

Methods

Different volume percentages of HEMA were tested in four experimental silane-based primer solutions (additions of HEMA: 0, 5.0 vol%, 25.0 vol% and 50.0 vol%). An experimental silane blend (primer) of 1.0 vol% 3-isocyanatopropyltrimethoxysilane (ICMS) + 0.5% bis-1,2-(triethoxysilyl) ethane (BTSE) was prepared and used. The experimental primers together with the control group were applied onto acid-etched premolars for attachment of orthodontic brackets. After artificial aging by thermocycling the shear-bond strength was measured. The fractured surfaces of all specimens were examined under scanning electron microscopy (SEM) to evaluate the failure mode on the enamel surface.

Results

The experimental primers showed the highest shear-bond strength of 21.15 MPa (SD ± 2.70 MPa) and with 25 vol% showed a highly significant increase (P < 0.05) in bond strength. The SEM images showed full penetration of adhesive agents when using silane-based primers. In addition, the SEM images suggested that the predominant failure type was not necessarily the same as for the failure propagation.

Conclusions

This preliminary study suggested that nonacidic silane-based primers with HEMA addition might be an alternative to for use as adhesion promoting primers.

Ancillary