Maxillary central incisors width/height ratio and assymetry
|
-the esthetic ratio width/height of the central maxillary incisor varies
between 75 and 85% (26).
-a smile is considered as unesthetic if the central incisors have
assymetrical incisal edges (4).
|
Midline and tooth angulation
|
-a midline deviation greater than 2mm is considered as unesthetic (46)
-an angulation greater than 3,5° is notable to laypeople (47)
|
Gingival exposure |
-according to various studies, a smile is considered
as unesthetic if the gingival margin exposure exceeds 2 to 3 mm
(39,48). |
Gingival margin
|
-gingival margin difference between the central incisors and the
maxillary canines varies between 0 and 1mm(49).
-lateral incisors have a gingival margin of 0.5mm below the central
incisor (50).
|
Smile arc
|
-depends on the vertical positioning of the maxillary incisors.
-a smile is considered as esthetic if the incisal edges of the maxillary
incisors are below the cuspid tip of the canines (41,51).
|
Lips and teeth positionning
|
-voluminous lips are considered as most esthetic (26)
-maxillary incisal edges must touch the lower vermilion of the lip
(52).
|
Tooth color and anatomical shape |
(see text above) |
Anterosuperior teeth ratio |
(see text above) |
Diastema |
(see text above) |