Smile Evaluation

Facial analysis for smile evaluation

Facial midline and midline of centrals
Inter-pupillary lines to incisal edge
Full face analysis

Sagittal plane analysis

Ricketts E-Plane (4mm from upper lip and 2mm from lower lip)
Nasio-labial angle M=90-95 degree F=100-105 degree (can determine cervical thickness crowns or veneers if lip covers in smiling)

Smile evaluation and Dental analysis

Step #1 = Incisal edge and embrasures

Amount of tooth showing at rest (use M sound to determine)
Phonetically the F and V sound should but edge at wet/dry (vermillion) border of lower lip
Curvature follows lower lip
RULE of 42.2 4mm central show at rest and within 2mm lower lip 2mm most gingiva show at smile
Lips at rest canine is at “0” display
Fills 50-60% of distance from upper to lower lip @ rest

Step #2 = Midline symmetry

Kokich shows up to 4mm and layperson does not notice

Step #3 = Gingival margin

Step #4 = Mirror the centrals and cousin the rest

Step #5 = Golden Proportion

Centrals = 50% Laterals = 30% and viewable portion from facial of Canines = 20%
Width is 78% length 75-80 range
10.5mm is about average length central incisor and good starting point

Step #6 = Angles of teeth

All teeth incline towards belly button
Fill the buccal corridor

Step #7 = Hue, Chroma, Value and incisal translucnecy of teeth

Step #8 = Shape and texture of teeth

Papilla height as compared to contact length. Ideally the papilla tip should take up 45-50% of the total length of the tooth from the gingiva to the end of the contact, with the contact using up the remaining 50-55% of this distance. Tapered incisors are preferred for men and women. Del Monte 2017 JPD