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.
'+' + (voteCount + 1) : (voteCount + 1) }}. Dark gums are usually due to Porcelain fused to metal crowns, where the metal margin of the crown shows through the gums. An all porcelain crown will not cause the gums to darken, especially if the margin of the crown is tucked slightly under the gums. However, if the tooth under the crown is dark or stained due to a root canal treatment, then it needs to be bleached internally before the crown is fabricated and cemented.