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
Step #9 = Protrusive or retrusive
- Want a reflective surface
- Deflective surface is common with post ortho upper bi-ext
- Deflective teeth look smaller and DARKER
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Deflective on left and composite added to facial to make right side reflective |
Line angles of anterior teeth
The lateral has one distinction in it’s line angles.
The reflective surface, also known as the facial plane, is the area within the line angles.
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