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.
In a tooth with gum recession, the gum tissue has pulled away from the tooth. This can leave the tooth root exposed. Since the root. surface does not have a hard enamel covering like the crown (top) of the tooth, the root may become. sensitive to hot and cold. Also, the exposed tooth root is more at risk for decay.