The Procera crown â Procera is a milled ceramic on the inside with a more traditional porcelain baked onto the outside. The advantage of Procera is its exceptional strength. However, the milled ceramic core is opaque white, so many cosmetic dentists feel that it isnât as natural-looking as the more translucent materials.
1 February: On February 15 the Romans celebrated the festival of forgiveness for sins; (februare, Latin to purify), 2  March: Mars, the Roman god of war,  April: Roman month Aprilis, perhaps derived from aperire, (Latin to open, as in opening buds and blossoms) or perhaps from Aphrodite, original Greek name of Venus,
The origins of Black History Month can be traced back to a man named Carter G. Woodson (1875-1950). 1  Woodson, the son of former slaves, was an amazing man in his own right. Since his family was too poor to send him to school as a child, he taught himself the basics of a school education.