Among all the factors responsible for dental crowding, previously only the relationship of the arch dimension to crowding has been investigated in Pakistan.
Pre-treatment dental casts were used to calculate crowding. Mandibular and maxillary crowding were calculated as the difference between arch perimeter and the sum of the mesio-distal dimensions of the teeth, in millimetres, from the second premolar on one side of the arch to the second premolar on the other side.
The maxillary and mandibular crowding
was resolved; positive overjet and overbite were achieved.
Thus the objective of the study is to determine the cause of crowding in Class I malocclusion in both genders by measuring and comparing mesio-distal width of teeth in crowded and non-crowded arches and comparing arch widths in crowded and non-crowded arches.
First category the non-crowded one included Class I molar canine and incisor relationship with crowding spacing and/or midline discrepancy not exceeding 1mm.
The crowding may affect the whole arch or be localized to the anterior segment, though crowding in the anterior segment is reported to be the more common than in the posterior segment of the lower arch.3
Premature loss of deciduous teeth, morphology of the mandibular incisors and size of dental arch are also deemed to be contributing factors to lower incisor crowding. 7-12 This research was done on Northwest Europeans and selected American races with little or no corroboration from data obtained on patients of Asian ethnicities.
Recognizing permanent incisor crowding at an early stage is very important for interceptive treat- ment planning.1 An increasing number of parents are concerned about the possibility of future dental crowdprimary canines, maxillary and mandibular dental arch length as factors in the early mixed dentition that could possibly be indicators for crowding.
When the permanent lateral incisors erupt,reasons.2 Dental crowding is defined as a disparity in the relationship between tooth size and jaw size that an average 1.6 mm of additional space is required for the perfect alignment of the four permanent inciresults in imbrications and rotation of teeth.3 Anterior sors.
The accurate assessment of dental crowding
and the space required to alleviate this malocclusion is critical for correct orthodontic diagnosis and treat-ment planning.