http://www.deardoctor.com/articles/dental-implant-options/index.php
http://www.deardoctor.com/articles/porcelain-crowns-and-veneers/index.php
https://www.sciencedaily.com/releases/2017/09/170907093610.htm
https://www.sciencedaily.com/releases/2016/11/161116101821.htm
http://www.deardoctor.com/articles/guide-to-dental-injuries/page4.php