Beginners guide to smile design 3shape part 1b

Incisal edge position evaluated during maximum smile using exaggerated 'e' sound.
- Helps in retracting muscles and raising lips, revealing important aspects of the smile.
- Useful for diagnosing hypermobile lips (>8 mm movement).
- Hypermobile lips may indicate an issue with lip display and smile aesthetics.
- Surgical options or frenectomy may be necessary for correction.
Ideal position of the incisal edge is between 30% to 70% relative to the midline between the lips.

Midline must be carefully assessed:
- Should be perpendicular to the incisal edges.
- Should align parallel to the midline of the face, contributing to symmetrical appearance.
- Adjustments can be made, with up to 4 mm shifts undetectable by many.
- Important to avoid tilting midline angles; professionals easily discern even slight angles.

Shift can occur without noticeable change in position.
- Avoid significant angular shifts (1-2 degrees) as these will be noticeable.
- Best practice to center the midline above papillae for aesthetic purposes.

Smile line should follow the contour of the lower lip:
- Ideally, maintain a slight positive curvature relative to the lip line.
- Negative or concave smile lines are to be avoided.
Dentition setup examples:
- Longer central teeth and shorter canine/lateral teeth ratio provides a natural look.

Teeth alignment should be slightly inclined vertically toward the center.
- Avoid canted teeth to maintain a natural aesthetic.
Proper inclination ensures the lines appear coherent down to the teeth, affecting overall look.

Focus on aesthetic proportions rather than strict measurements.
- Central teeth height-to-width ratio: 76% to 83%.
- Example: Central tooth at 10mm height, width should range from 7.6mm to 8.3mm.