The MOBEX was conducted to rehearse this operation procedure. Commander Song Hwan Yun, 32nd KSC Company, KSC, said, Although these are annual exercises and we perform them every year, the exercises this year, especially the MOBEX, were executed with a contingency or wartime situation in mind.
It is very unfortunate when there are black rims around porcelain crowns and porcelain veneers. This should NOT happen! The black stain around the rim of the crown or porcelain veneers is contamination. The bonding technique was a failure as there was something that was not completed thoroughly. In all fairness to the dentist, it is very difficult to bond porcelain crowns and porcelain veneers at the gum line.
While many people are fortunate enough to have cavity resistant tooth enamel, few people have cavity resistant root surface. When gums recede below the enamel line of the tooth or pull away from the tooth, root surface is exposed. The root surface does not have a hard protective enamel covering like the crown of the tooth. This unprotected surface is very vulnerable to decay. Root caries do not occur unless the root of the tooth is exposed or there is loss of attachment of the gum to the tooth.