The Publisher regrets that this article is an accidental duplication of an article that has already been published in Journal of Dentistry, 102 (2020) article number 103479, https://doi.org/10.1016/j.jdent.2020.103479. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal