Source:http://linkedlifedata.com/resource/umls/id/C0011350
MSH: A hard thin translucent layer of calcified substance which envelops and protects the dentin of the crown of the tooth. It is the hardest substance in the body and is almost entirely composed of calcium salts. Under the microscope, it is composed of thin rods (enamel prisms) held together by cementing substance, and surrounded by an enamel sheath. (From Jablonski, Dictionary of Dentistry, 1992, p286),CSP: hard, thin, translucent layer of calcified substance that envelops and protects the dentin of the crown of the tooth, almost entirely composed of calcium salts.,NCI: A hard, thin, translucent layer of calcified substance that envelops and protects the dentin of the crown of the tooth. It is the hardest substance in the body and is almost entirely composed of calcium salts.