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Silver diamine fluoride and bond strength to enamel in vitro: A pilot study
Katie J Camacho1, Jeryl D English2, Helder B Jacob2
1Private practice limited to Orthodontics, Midland, Texas, USA.
Purpose:
To evaluate if pre-treatment with silver diamine fluoride (SDF) adversely affects the bond strength of orthodontic brackets to enamel.
Methods:
30 extracted non-carious permanent molar teeth were embedded in acrylic resin cylinders with buccal surfaces exposed and randomly divided equally into two groups. The experimental enamel surfaces were treated with 38% SDF applied for 1 minute between phosphoric acid etch and metal orthodontic bracket bonding with Transbond XT Light Cure Adhesive. Control groups were treated with 37% phosphoric acid etch followed by bonding. All samples were subjected to 500 thermocycles between 5°C and 55°C prior to shear load testing. Mean values and standard deviations of shear bond strengths for each group were analyzed using a general linear model at P< 0.05. Characteristics of bond failure were also recorded via Adhesive Remnant Index (ARI) and analyzed using an ordinal logistic regression at P< 0.05.
Results:
No significant difference in shear bond strength to enamel was observed between the control and experimental groups (P= 0.65). Comparison of ARI did demonstrate a significant difference between the groups (P= 0.013); SDF significantly altered the characteristic of bond failure, resulting in more adhesive remaining bonded to enamel after failure. No silver staining of treated surfaces was observed.
Clinical Significance:
The application of SDF to etched non-carious enamel in vitro prior to orthodontic bracket bonding does not adversely affect bond strength.
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