Orthodontic bracket bonding to glazed full-contour zirconia.
10.5395/rde.2016.41.2.106
- Author:
Ji Young KWAK
1
;
Hyo Kyung JUNG
;
Il Kyung CHOI
;
Tae Yub KWON
Author Information
1. Department of Medical and Biological Engineering, Graduate School, Kyungpook National University, Daegu, Korea.
- Publication Type:Original Article
- Keywords:
Adhesive;
Bonding;
Orthodontic brackets;
Zirconia
- MeSH:
Adhesives;
Aluminum Oxide;
Hydrofluoric Acid;
Microscopy, Electron, Scanning;
Orthodontic Brackets*;
Spectrum Analysis;
Water
- From:Restorative Dentistry & Endodontics
2016;41(2):106-113
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVES: This study evaluated the effects of different surface conditioning methods on the bond strength of orthodontic brackets to glazed full-zirconia surfaces. MATERIALS AND METHODS: Glazed zirconia (except for the control, Zirkonzahn Prettau) disc surfaces were pre-treated: PO (control), polishing; BR, bur roughening; PP, cleaning with a prophy cup and pumice; HF, hydrofluoric acid etching; AA, air abrasion with aluminum oxide; CJ, CoJet-Sand. The surfaces were examined using profilometry, scanning electron microscopy, and electron dispersive spectroscopy. A zirconia primer (Z-Prime Plus, Z) or a silane primer (Monobond-S, S) was then applied to the surfaces, yielding 7 groups (PO-Z, BR-Z, PP-S, HF-S, AA-S, AA-Z, and CJ-S). Metal bracket-bonded specimens were stored in water for 24 hr at 37℃, and thermocycled for 1,000 cycles. Their bond strengths were measured using the wire loop method (n = 10). RESULTS: Except for BR, the surface pre-treatments failed to expose the zirconia substructure. A significant difference in bond strengths was found between AA-Z (4.60 ± 1.08 MPa) and all other groups (13.38 ± 2.57 - 15.78 ± 2.39 MPa, p < 0.05). For AA-Z, most of the adhesive remained on the bracket. CONCLUSIONS: For bracket bonding to glazed zirconia, a simple application of silane to the cleaned surface is recommended. A zirconia primer should be used only when the zirconia substructure is definitely exposed.
