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Ugly Duckling Stage
(Broadbent phenomenon)
Inter-transitional Period
Second Transitional Period
It is characterized by the replacement of the primary molars & canines by the premolars & permanent canines respectively.
The combined mesiodistal width of the permanent canines & premolars is usually less than that of the primary canines & molars. This surplus space is called LEEWAY SPACE.
It is – 1.8 mm in Maxilla (0.9 mm each side)
– 3.4 mm in Mandible (1.7 mm each side)
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Teeth Arranged in the oral cavity in two arches called the dental arches one upper (Maxilla) and one lower (Mandible). Each dental arch has a midline, an imaginary…