Grattage. a method of drawing by scratching paper or cardboard that has been covered with india ink with a pen or a sharp instrument. The grattage process is reminiscent of scraping an oiled surface in lithography.rattage. a method of drawing by scratching paper or cardboard that has been covered with india ink with a pen or a sharp instrument. The grattage process is reminiscent of scraping an oiled surface in lithography.
3. (Zoology) of or relating to the surface of an animal, such as a jellyfish, on which the mouth is situated. 4. (Medicine) denoting a drug to be taken by mouth Compare parenteral: an oral contraceptive.
For the front teeth, the area closest to the lips is called the labial surface. For the back teeth (molars and premolars), the area that faces the cheeks is called the buccal surface, and the biting (chewing) area is called the occlusal surface. There are different types of permanent teeth, each of which performs a specific function. Central Incisors: The central incisors are the front teeth.