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KMID : 0361920100400030184
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Korean Journal of Orthodontics
2010 Volume.40 No. 3 p.184 ~ p.194
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Effect of tribochemical silica coating on the shear bond strength of rebonded monocrystalline ceramic brackets
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Jeon Young-Mi
Son Woo-Sung
Kang Sang-Wook
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Abstract
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Objective: The purpose of this study was to investigate the effect of tribochemical silica coating on the shear
bond strength (SBS) of rebonded ceramic brackets using nano-filled flowable composite resin.
Methods: A total of 60 premolars were prepared and divided into 4 equal groups as follows: Tribochemical silica coating (TC) + Transbond XT (XT), TC + Transbond supreme LV (LV), Sandblast treatment (SA) + XT, SA + LV. Treated ceramic brackets were rebonded on the premolars using each adhesive. All samples were tested in shear mode on a universal testing machine.
Results: SBS of silica coated groups were high enough for clinical usage (TCLV: 10.82 ± 1.82 MPa, TCXT: 11.50 ± 1.72 MPa). But, SBS of the sandblast treated groups had significantly lower values than the tribochemical silica coated groups (SALV, 1.23 ± 1.16 MPa; SAXT, 1.76 ± 1.39 MPa; p ＜ 0.05). There was no difference between the shear bond strength by type of adhesive. In the silica coated groups, 77% of the samples showed bonding failure in the adhesive. In the sandblast treated group, all bonding failures occurred at the bracket-adhesive interface.
Conclusions: The result of this study suggest that newly introduced nano-filled flowable composite resin and tribochemical silica coating application on debonded ceramic bracket bases can produce appropriate bond strengths for orthodontic bonding.
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KEYWORD
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Tribochemical silica coating, Ceramic bracket, Shear bond strength
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