This study recognized the possible etiological factors of malocclusions in children treated at the Orthodontic department of the Universidad Nacional Mayor de San marcos. Lims - Perú. 50 patients where taken at ramdom presenting Class I or Class II skelletal malocclusion 29 male and 21 female. The etiological factors with greater prevalence where the herital factor 30%, big teeth 20% thumb suck 14% bucal respiratory factor 12%

This is a study of 57 researches ¡n maloclusión prevalence ¡n different locations ¡n Perú, from Lima, Ica und Arequipa. From a universe of 25,036 people most of them male and female children, we obtain, that the 19.2% of peruvian people presents a normal oclussion and the 80.8% presents maloclussion. Joined all researches by natural environment, we have 21.5% of normal oclussion in the jungle, brrn this the greater average of normal oclussion. Using Angle classification we obtain Class 174.6%, Class II 15% and Class III 10.4%.

This study recognized the possible etiological factors of malocclusions in children treated at the Orthodontic department of the Universidad Nacional Mayor de San marcos. Lims - Perú. 50 patients where taken at ramdom presenting Class I or Class II skelletal malocclusion 29 male and 21 female. The etiological factors with greater prevalence where the herital factor 30%, big teeth 20% thumb suck 14% bucal respiratory factor 12%

This is a study of 57 researches ¡n maloclusión prevalence ¡n different locations ¡n Perú, from Lima, Ica und Arequipa. From a universe of 25,036 people most of them male and female children, we obtain, that the 19.2% of peruvian people presents a normal oclussion and the 80.8% presents maloclussion. Joined all researches by natural environment, we have 21.5% of normal oclussion in the jungle, brrn this the greater average of normal oclussion. Using Angle classification we obtain Class 174.6%, Class II 15% and Class III 10.4%.

The purpose of this study consisted in determining the stages of bony maturation according to the classification of Helm and Björk, in 80 children patients who went for orthodontic treatment to the clinic of the Faculty of Odontology of UNMSM. Of the total of children, 38 were females and 42 were males. The ages oscillated between 7 and 13 years of age. The results indicated that in the children, the stage MP3 cap that correspond to the growth tip found at the age of 10.29 years whereas in males the same phase occurred at the age of 12.12 years. These results demostrate that the Peruvian population matures early in relation to other population like the European.

The purpose of this study consisted in determining the stages of bony maturation according to the classification of Helm and Björk, in 80 children patients who went for orthodontic treatment to the clinic of the Faculty of Odontology of UNMSM. Of the total of children, 38 were females and 42 were males. The ages oscillated between 7 and 13 years of age. The results indicated that in the children, the stage MP3 cap that correspond to the growth tip found at the age of 10.29 years whereas in males the same phase occurred at the age of 12.12 years. These results demostrate that the Peruvian population matures early in relation to other population like the European.