Korean J Orthod.  2010 Jun;40(3):184-194. 10.4041/kjod.2010.40.3.184.

Effect of tribochemical silica coating on the shear bond strength of rebonded monocrystalline ceramic brackets

• Jeon YM
• Son WS
• Kang SW

• KMID: 1459572
• DOI: http://doi.org/10.4041/kjod.2010.40.3.184

Abstract

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.

Keyword

Tribochemical silica coating; Ceramic bracket; Shear bond strength

MeSH Terms

Adhesives
Bicuspid
Bisphenol A-Glycidyl Methacrylate
Ceramics
Collodion
Composite Resins
Resin Cements
Silicon Dioxide
Adhesives
Bisphenol A-Glycidyl Methacrylate
Ceramics
Collodion
Composite Resins
Resin Cements
Silicon Dioxide

Figure

• 

  Fig. 1 SEM photomicrograph of ceramic bracket base (magnification × 30). A, New bracket, silica powders uncoated; B, new bracket, silica powders can be seen; C, silica powders were removed from the bracket base after debonding (modified ARI score 1).

• 

  Fig. 2 Application of shear debonding force.

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  Fig. 3 SEM photomicrograph of re-treated ceramic bracket base. A, B, C, Silica coated ceramic bracket. Silica particles can be seen (arrow)(magnification × 30, × 250, × 10,000); D, E, F, sandblasted ceramic bracket (magnification × 30, × 250, × 10,000).

• 

  Fig. 4 Energy dispersive X-ray analysis. A, Silica coated bracket base surface; B, sandblasted bracket base surface.

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