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mohammadsadegh ahmadakhondi

Assessment of Bond Strength between Metal Brackets and Non-Glazed Ceramic in Different Surface Treatment Methods.


Authors: Ahmad Akhoundi M, Rahmati Kamel M, Hooshmand T, Harririan I, Kharazi Fard M, Noroozi H.
Keywords: Dental Porcelain, Orthodontic Brackets, Shear Strength
(J Dent (Tehran, Vol.7, No.2, 2010,Page:64-70

OBJECTIVE:

The aim of this study was to evaluate the bond strength between metal brackets and non-glazed ceramic with three different surface treatment methods.

MATERIALS AND METHODS:

Forty-two non-glazed ceramic disks were assigned into three groups. Group I and II specimens were etched with 9.5% hydrofluoric acid. Subsequently in group I, silane and adhesive were applied and in group II, bonding agent was used only. In group III, specimens were treated with 35% phosphoric acid and then silane and adhesive were applied. Brackets were bonded with light-cured composites. The specimens were stored in water in room temperature for 24 hours and then thermocycled 500 times between 5°C and 55°C.

RESULTS:

The difference of tensile bond strength between groups I and III was not significant (P=0.999). However, the tensile bond strength of group II was significantly lower than groups I, and III (P<0.001). The adhesive remnant index scores between the three groups had statistically significant differences (P<0.001).

CONCLUSION:

With the application of scotch bond multi-purpose plus adhesive, we can use phosphoric acid instead of hydrofluoric acid for bonding brackets to non-glazed ceramic restorations.