Received: 11 March 2019
Accepted: 20 May 2019
First Online: 6 June 2019
Ethics approval and consent to participate
: No patient data was used here, and no patients did contribute in any way to the present in vitro study: therefore, not Ethics Committee approval nor consent to participate was requested for this research.
: Not applicable.
: The authors declare that they have no competing interests in relation to the present study. Francesco Mangano is a Section Editor for BMC Oral Health.