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KMID : 0361919830130020209
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Korean Journal of Orthodontics
1983 Volume.13 No. 2 p.209 ~ p.222
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Case Reports of Angle´s Class Ⅱ, Division 1 malocclusions treated by Bioprogressive Therapy
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Abstract
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Widths between the first permanent molars and the mesio-distal widths of the four anterior
teeth were measured on 32 lower and 33 upper dental casts of young adults aged 18-25 yerars. The casts were, grouped in five categories-two where no anterior crowding existed, and three
in which varying degrees of crowding were present.
Subjects with a difference between arch width and anterior tooth widths greater than 4mm
in the upper arch, or 10mm in the lower arch, rarely had crowding.
As arch width changes very little from age 7 onwards, measurements at this age maybe used
as a screening mechansim for future arch crowding.
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