MLD is usually caused by the lack of an important enzyme called arylsulfatase A. Because this enzyme is missing, chemicals called sulfatides build up in and damage the nervous system, kidneys, gallbladder, and other organs. In particular, the chemicals damage the protective sheaths that surround nerve cells.
What is a dental crown? The anatomy of a tooth can be divided into two basic parts -- the root and the crown. In a person with healthy gums and bone, the root of the tooth is covered by the gums and bone. The part of the tooth that is visible in the mouth, above the gum line on lower teeth and below the gum line on upper teeth, is called the clinical crown. A cemented restoration that partially or completely covers the outside of the clinical crown is referred to as a dental crown or cap.
Gold crowns are one of the classic types of dental crowns used in dentistry. There are two types of gold crowns used to restore a tooth. The full gold crown is made entirely from gold or gold alloy. A porcelain fused to metal crown (PFM) is made from a combination of gold and porcelain. In regards to the gold, there are three types of alloy used for fabricating gold crowns: High Noble Alloy - Precious Metal - Made from, at a minimum, 60% high noble alloy. This includes gold, platinum and palladium.