Shear bond strength of a single use self-etching primer used multiple times over 24 hours
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Date
2021
Authors
Williams, Nadine
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Abstract
Objectives: To determine whether single use Transbond Plus™ self-etching primer (SEP) (3M Unitek, Monrovia, Calif) in vitro shear bond strength (SBS) will be affected if used multiple times over a prolonged period, for cost-effectiveness.
Materials and Methods: Transbond ™ Plus SEP was used to bond brackets to 120 extracted human teeth at three different time points after opening the SEP package: immediately- (as recommended by manufacturer), 4 hours-, and 24 hours after opening. Samples were debonded with a universal testing machine after 24 hours to assess short term SBS, and after 2 months to assess bond maturation.
Results: No statistically significant difference in SBS was found in the 24-hour debond group between the different time points of package opening, but there was a significant statistical difference for the 2-month debond group (p<0.05), which also showed an increased coefficient of variation range. SBS matured from the 24-hour debond group to the 2-month debond group but decreased or stayed the same when manufacturer guidelines were not followed.
Conclusions: Short term SBS is not affected when using an opened SEP package multiple times after 24 hours, but more long term SBS is affected, and shows more variable and inconsistent values. However, no group’s minimum value decreased below the “clinically acceptable” standard of 6-8 MPa for in vitro SBS testing, suggesting a more cost-effective bonding protocol might be possible with Transbond ™ Plus SEP. It remains vital to pumice teeth before bonding with a SEP during the Covid-19 pandemic, even though pumicing is considered an aerosol generating procedure.
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Keywords
Self-etching primers, Single use, Shear bond strength, Transbond Plus