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.
The bulk of the tooth is composed of dentin. The dentin of the crown is covered. by enamel and the dentin of the root is covered by cementum. The cementoenamel junction marks the. transition from root to crown and is known as the cervix or cervical region. Inside the dentin of the root and. the crown is a hollow chamber filled with the soft tissue known as pulp.