Incisal Edge Position

Phonetics help determine the incisal edge position. The incisal edges should lightly touch the vermilion border (wet/dry line) of the lower lip when making F and V sounds. This location, along with the principles of proportion, helps to verify the length of each tooth. The pitch of each anterior tooth is determined by the combination of correct lip support and the linguo-labial position of the incisal edge. The incisal edge position not only serves an esthetic function but is essential to proper function as well.