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,
Origin of the names of the months. Only a few names of the month were derived from Roman deities. Most simply came from the numbers of the months or -- in two cases -- in honor of Roman emperors. January. Named after the Roman god of beginnings and endings Janus (the month Januarius). February.