The aim of the present study was to compare the dentoskeletal features of subjects with normal occlusion
in the mixed dentition and different facial patterns by means of a geometric morphometric analysis (TPS analysis) applied to PA cephalograms.
Dimensions and form of dental arches in subjects with normal occlusions
Dental arch in normal occlusion
part I: Size of teeth and percentage ratio between lower and upper teeth.
In addition, subjects' plaster models had to present normal occlusion
with full dentition (except third molars), absence of crossbite, absence of open bite and at least 4 of the 6 Andrews' normal occlusion
keys (ANDREWS, 1972).
The relation of maxillary structures to cranium in malocclusion and normal occlusion
15[degrees]) substantially differed from the values that have been found for the normal occlusion
sample (1) and from bracket prescriptions that have been suggested by different techniques and authors.
22 Andrews8 also suggested that one of the six keys to normal occlusion
is the existence of a leveled occlusal plane or a mild curve of Spee, which was observed in the present study, with a mean value of 1.
, with Full complement of teeth, inter digitating in class one occlusion.
13,15,16 A study done by stately et al found that the arch width in normal occlusion
was larger than class II and concluded that maxillary arch is narrower in class II compared to the other malocclusion groups in accordance with the present study.
Gupta DS et al7 using one hundred dental models of normal occlusion
evaluated the reliability of Pont's Index on a North Indian population.
While it would be impractical to describe these landmarks and angles for every clinical case, establishing mean values for normal occlusion
samples and malocclusion samples would allow the creation of a more accurately torqued straight wire appliance, customizable even to the patient's individual occlusal needs.
11 Despite the sub- stantial prevalence of Class II malocclusion as an orthodontic problem, review of the related literature showed no agreement for growth changes of the man- dible in untreated subjects with Class II malocclusion, when compared with subjects with normal occlusion