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Surface preparation for orthodontic bonding to porcelain
Y O Zachrisson1, B U Zachrisson, T Büyükyilmaz
1Department of Orthodontics, University of Oslo, Norway.
Summary
Silane application to sandblasted porcelain significantly improves orthodontic bracket bond strength. Adding an intermediate resin further enhances bond quality, while hydrofluoric acid etching is effective, but APF gel is less so.
Area of Science:
- Dental Materials Science
- Orthodontic Bonding
- Surface Treatments
Background:
- Orthodontic bracket debonding from porcelain restorations is a clinical concern.
- Effective bonding strategies are crucial for successful orthodontic treatment involving metal-ceramic restorations.
Purpose of the Study:
- To evaluate the impact of various porcelain surface treatments on the tensile bond strength of orthodontic brackets.
- To compare the efficacy of different bonding resins and surface preparation methods.
Main Methods:
- Feldspathic porcelain tabs were subjected to sandblasting, silane, intermediate resin, or etchants (hydrofluoric acid, APF gel).
- Orthodontic brackets were bonded using Bis-GMA or 4-META resins.
- Samples underwent water storage and thermocycling before tensile bond testing.
Main Results:
- Silane application to sandblasted porcelain significantly increased bond strength.
- An intermediate resin further improved bond quality.
- 9.6% hydrofluoric acid etching yielded comparable bond strengths to silane, while 4% APF gel was less effective.
Conclusions:
- Silane treatment is a highly effective method for enhancing orthodontic bracket bond strength to feldspathic porcelain.
- Hydrofluoric acid etching offers a viable alternative, but APF gel shows limited efficacy.
- Further clinical trials are needed to confirm the long-term efficacy of these laboratory findings.