Methods: A sample group was chosen of 85 individuals with normal occlusion, consisting of 42 females and 43 males between the age of 9 and 11. A series of cephalometric parameters (related to Mcnamara analysis such as SNA.Facial axis angle, mandibular plan angle) and lineal parameters (also related to Mcnamara analysis such as mandibular length, midfacial length, ANS to Me, U1 to Apoint, L1 to Apoint) were traced in computed programmed cephalometric analysis. Superimpositions of the initial and final cephalometries in the Ba-N plane and in the Nasion fixed point were carried out to measure growth. An analytic statistical analysis was applied using Mann-Whitney U for independent samples in order to evaluate the differences found according to sex. An analysis of variance followed by Wilcoxon signed ranks was done to study the evolution of each variable throughout the duration of the experiment.
Results: In parameters such as U1-Ap, mandibular length, midfacial length, sup/inf airway the P-value was 0.001, and in Ans-Me, Max/Mand diff the P-value was 0.0001 which were statistically significant. In assessment, the influence of sex just in Na-Pog the P-value was 0.34 which was significant in comparison with the girls.
Conclusions: In light of the results obtained, the following points were concluded: in samples there are significant increase in 9 to 11 years old in most of the parameters except for Na-Pog distance, SNA angle, and facial axis angle. In assessment of the effect of the sex there is only a significant difference in Na–Pog between two groups during growth, which was more significant in boys.
This abstract is based on research that was funded entirely or partially by an outside source: Shahid Beheshti Dental Research center.