cosmetic dentistry veneers: The Good, the Bad, and the Ugly
https://alpha-wiki.win/index.php?title=20_Gifts_You_Can_Give_Your_Boss_if_They_Love_extreme_makeover_cost
They are named based on the approximated wall surface coverage of the walls of the tooth; e.g. the 3/4 crown intends to cover three out of the 4 wall surface, with the buccal wall surface being typically spared,