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Progress in Orthodontics

Table 1 Characteristics of the smiles used in this study

From: Perception of smile esthetics by laypeople of different ages

Adjusted vertical positions of the maxillary central incisors

Gingival margins of the maxillary central incisors

Central to lateral incisor edge level

(1) 0.5 mm intruded

0.5 mm above the canines

0 mm

(2) 0 mm unaltered

Equal with the canines

0.5 mm

(3) 0.5 mm extruded

0.5 mm below the canines

1.0 mm

(4) 1.0 mm extruded

1.0 mm below the canines

1.5 mm

(5) 1.5 mm extruded

1.5 mm below the canines

2.0 mm

(6) 2.0 mm extruded

2.0 mm below the canines

2.5 mm

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