Resumen

ESSOP, R; GHABRIAL, E  y  BECKER, PJ. In-vitro comparison of bonding time and strength of adhesive pre-coated and standard metal orthodontic brackets. S. Afr. dent. j. [online]. 2022, vol.77, n.10, pp.587-591. ISSN 0375-1562.  http://dx.doi.org/10.17159/2519-0105/2022/v77no10a1.

OBJECTIVE: To compare the shear bond strength and bond time of 3M Unitek's APC (Adehesive Pre-Coated) Flash-Free™ system applied to metal brackets. Materials and Methods: An in vitro study was performed on 40 extracted sound human premolar teeth randomly divided into two groups (20 per group) bonded either with Adhesive Pre-Coated Flash-Free metal brackets or metal brackets coated manually with Transbond XT™ light-cure adhesive. Bonding time was measured using a stopwatch. Thermoycling was performed on the samples (500 cycles) to simulate the oral environment between baths of 5°C and 55°C distilled water. Debonding shear bond strength measurements were performed in an Instron universal testing machine. RESULTS: The APC Flash-Free group bonded in significantly (p<0.001) less time (mean 34.06s/tooth) than the manually coated group (mean 55.14s/tooth). Shear bond strength of the manually coated group was significantly (p<0.001) higher (mean 13.32 MPa) than the APC Flash-Free group (mean 10.95 MPa). CONCLUSION: The APC Flash-Free free system is efficient and allows for reduced chair time during the bonding appointment while attaining a mean shear bond strength of 10.95MPa, which is higher than the minimum shear bond strength of between 4MPa and 7MPa^1.

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