Funding for this research was provided by:
Received: 27 November 2019
Accepted: 2 September 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: The study was approved by the ethics local committee of the faculty of dentistry of the university of chile (approval number 15/001). All Participants signed an informed consent form approved by the Ethics Committee of the Faculty of Dentistry of the University of Chile.
: Not Applicable.
: The authors declare that they have no conflicts of interests and the authors do not have any financial interest in the companies or products used in this study.