Korean J Orthod.  2014 May;44(3):105-112. 10.4041/kjod.2014.44.3.105.

Effect of silica coating on bond strength between a gold alloy and metal bracket bonded with chemically cured resin

Affiliations
  • 1Department of Orthodontics, School of Dentistry, Chosun University, Gwangju, Korea. 022bracket@gmail.com

Abstract


OBJECTIVE
The purpose of this study was to evaluate the effects of three different surface conditioning methods on the shear bond strength (SBS) of metal brackets bonded directly to gold alloy with chemically cured resin.
METHODS
Two hundred ten type III gold alloy specimens were randomly divided into six groups according to the combination of three different surface conditioning methods (aluminum oxide sandblasting only, application of a metal primer after aluminum oxide sandblasting, silica coating and silanation) and thermocycling (with thermocycling, without thermocycling). After performing surface conditioning of specimens in accordance with each experimental condition, metal brackets were bonded to all specimens using a chemically cured resin. The SBS was measured at the moment of bracket debonding, and the resin remnants on the specimen surface were evaluated using the adhesive remnant index.
RESULTS
Application of metal primer after aluminum oxide sandblasting yielded a higher bond strength than that with aluminum oxide sandblasting alone (p < 0.001), and silica coating and silanation yielded a higher bond strength than that with metal primer after aluminum oxide sandblasting (p < 0.001). There was no significant change in SBS after thermocycling in all groups.
CONCLUSIONS
With silica coating and silanation, clinically satisfactory bond strength can be attained when metal brackets are directly bonded to gold alloys using a chemically cured resin.

Keyword

Bonding; Biomaterial science; Silicoating; Chemically cured resin

MeSH Terms

Adhesives
Alloys*
Aluminum Oxide
Gold Alloys
Silicon Dioxide*
Adhesives
Alloys
Aluminum Oxide
Gold Alloys
Silicon Dioxide

Figure

  • Figure 1 Schematic diagram of specimen used in experiment, and crosshead position for shear bond strength measurement.

  • Figure 2 Adhesion surface of gold alloy in the aluminum oxide sandblasting (AS) group. A, AS group; B, AS with thermocycling (AST) group. An adhesive remnant index of 0 was most frequently observed in AS and AST groups.

  • Figure 3 Adhesion surface of gold alloy in the aluminum oxide sandblasting plus metal primer (MP) group. A, MP group; B, MP with thermocycling (MPT) group. An adhesive remnant index of 1 was most frequently observed in MP and MPT groups.

  • Figure 4 Adhesion surface of gold alloy in the silicoating (SC) group. A, SC group; B, SC with thermocycling (SCT) group. An adhesive remnant index of 2 was most frequently observed in SC and SCT groups.


Cited by  1 articles

Comparison of shear bond strength of orthodontic brackets using various zirconia primers
Ji-Yeon Lee, Jin-Seok Kim, Chung-Ju Hwang
Korean J Orthod. 2015;45(4):164-170.    doi: 10.4041/kjod.2015.45.4.164.


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