الفهرس 
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Abstract
Aim: To Determine the combined mesio-distal width of the permanent mandibular incisors and the
width of the maxillary and mandibular canines, as well as, premolars in a group of Egyptian children
in PortSaid governorate. In addition to finding the correct relationship of the total mesiodistal width
of the teeth under study.
Materials and Methods: This study was conducted on 384 patients between the ages of 12-15 years
in PortSaid Governorate. Subjects were chosen to be free of any systemic disease and their teeth were
neither carious nor crowded. Impressions were made for the upper and lower arches. Each impression
was instantly poured into the stone plaster. The mesiodistal widths of mandibular incisors and
maxillary and mandibular canines, as well as, premolars were measured from the study models using
digital caliper.
Results: No significant difference was reported between the mean mesiodistal width of all teeth
between males (209) and females (175), there was statistically significant difference in the mean of
the mesiodistal tooth between the right and left sides for almost all teeth under study, there is a
positive correlation existed between the sum of the mesiodistal width of upper right canine and
premolars and the sum of the mesiodistal width the lower incisors among both genders combined,
there is a positive correlation between the sum of the mesiodistal width of the upper left canine and
premolars, and the sum of the mesiodistal width of the lower incisors between both genders combined.
A positive correlation observed between the sum of the mesiodistal width of the lower left canine and
premolars, and the sum of the mesiodistal width of the lower incisors between both genders combined,
A positive correlation exists between the sum of the mesiodistal width of the upper right canine and
premolars, and the sum of the mesiodistal width of the lower incisors between both genders combined.
Conclusion: The mesiodistal width of the upper and lower canines, as well as, the premolars can be
predicted by measuring the mesiodistal width of the lower incisors due to the positive correlation
between them.