Aims: To determine whether the accuracy of the prediction of the summed widths of unerupted permanent canines and premolars depend on the patient's gender and to examine whether there are differences between sexes in the best combination of independent variables for predicting and to developing new predicting equations for crowding patient for both jaws and both sexes. Materials and methods: The sample consisted of eighty dental casts (40 males and 40 females). The age ranged between (14-22) years and all patients have anterior crowding. The mesiodistal crown diameters of the central incisors, the lateral incisors, the canines, the first premolar, the second premolar, and the first molars in the maxillary and mandibular arch were measured on dental casts. Basal arch lengths and intermolar distances for the upper arch and for the lower arch were also recorded. Predicted sum widths of permanent canines and premolars in both dental arches were calculated using backward multiple regression analysis by using statistical package for social science (SPSS). Results: In the male subject group, there were statistically significant correlations between central incisor and lateral incisor widths in the maxilla (r=0.456) and in the mandible between lower central and lateral incisor widths and lower basal arch length (r=0.682), and in the female subject group, there were statistically significant correlations between the central incisor and the lateral incisor widths, upper first molar, upper basal arch length and upper inter molar distance (r=0.742). For the mandible, lower central and lateral incisor and lower first molar widths (r=724). Also the correlation coefficients (r) and determination coefficients (R 2 ) for female group are greater when compared with those for the male subject group. Conclusions: Four regression equations for crowding patients for both gender are establish and the best combination of independent variables for prediction was found to differ between sexes.
To determine the face type of young Iraqi adults in Mosul city and to find out the possible relationship of the face form in frontal and lateral planes.The sample subjects were normal class I molar and canine relationship, all subjects were following special criteria. The sample included: 60 Iraqi young adults (30 males and 30 females), aged (18-25) years. All subjects were radiographic with lateral and frontal cephalometric and the films were traced. The tracing is done including the external and internal contour of cranium, pituitary fossa, nasomaxillary complex and the mandible and it's out lie. The result was subjected to the descriptive statistics, to T-student test and to chi-square test to investigate the sex difference of facial type and means between the two sexes.All the linear measurements are significantly differ with the males having the large value. From the lateral view, the majority of the sample (60,9%) having mesofacial type with no significant difference between the two sexes, followed by dolichofacial type (34,4%) with the females having significantly large value than males, and the least brachyfacial type (4,7%) with the females having significantly large value.From the frontal view, the majority of the sample (84, 4%) having leptoprosopic type with no significant difference, followed by mesoprosopic type (15, 6%) with the females having significantly large value than males.The most frequent facial pattern, of this present sample in lateral view is mesofacial followed by dolichofacial and the least is brachyfacial, while in frontal view is leptoprosopic followed by mesoprosopic type. There is good correlation between facial type in frontal and lateral planes.
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