El estudio se hizo en una muestra de 73 niños peruanos, 37 del sexo masculino y 36 del sexo femenino entre las edades de 6 a 13 años, portadores de maloclusiones, que solicitaron atención en la Clínica de la Facultad de Odontología de la Universidad Nacional Mayor de San Marcos. Se hicieron radiografías cefalométricas laterales que fueron analizadas manualmente tomándose los valores angulares SNA, SNB y ANB de STEINER y FMA de DOWNS. Concluimos que las maloclusiones fueron más frecuentes entre los niños de 8-9 años de edad sin discriminación de sexo; el ángulo ANB disminuyó con la edad sin variación de sexo; hubo predominio de la clase II esquelética de las edades de 8-9 años en ambos sexos; los pacientes niños que solicitaron atención en la clínica son principalmente del tipo hiperdivergentes sin discriminación de sexo.

El estudio se hizo en una muestra de 73 niños peruanos, 37 del sexo masculino y 36 del sexo femenino entre las edades de 6 a 13 años, portadores de maloclusiones, que solicitaron atención en la Clínica de la Facultad de Odontología de la Universidad Nacional Mayor de San Marcos. Se hicieron radiografías cefalométricas laterales que fueron analizadas manualmente tomándose los valores angulares SNA, SNB y ANB de STEINER y FMA de DOWNS. Concluimos que las maloclusiones fueron más frecuentes entre los niños de 8-9 años de edad sin discriminación de sexo; el ángulo ANB disminuyó con la edad sin variación de sexo; hubo predominio de la clase II esquelética de las edades de 8-9 años en ambos sexos; los pacientes niños que solicitaron atención en la clínica son principalmente del tipo hiperdivergentes sin discriminación de sexo.

The present research to consist ¡n evaluate the prevalence of bacterial plaque, caries and maloclussions in 300 pupil school, of 6 to 14 years old. The results show wath the 14.9% present a average of index of plaque 0-0.09 (good), 31.9% a index of plaque was of 1-1.9 (medium) and in the 53.3% average of index of plaque was 2-3 (bad). The index average CPO was 3.18 and the ceo 2.91 mean 6 tooth affected with index for each pupil school. The average of maloclussions clase I was the 2.0%, the normo oclussions of 14.3%, the class II division I was the 2.0% not to see acopopated form case class III true.

The present research to consist ¡n evaluate the prevalence of bacterial plaque, caries and maloclussions in 300 pupil school, of 6 to 14 years old. The results show wath the 14.9% present a average of index of plaque 0-0.09 (good), 31.9% a index of plaque was of 1-1.9 (medium) and in the 53.3% average of index of plaque was 2-3 (bad). The index average CPO was 3.18 and the ceo 2.91 mean 6 tooth affected with index for each pupil school. The average of maloclussions clase I was the 2.0%, the normo oclussions of 14.3%, the class II division I was the 2.0% not to see acopopated form case class III true.

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 presents investigation shows the results of 480 cavities, trested with and without acid descalcification, during a control period of 18 months. The total of cavities were dividid acording its retention (microretention and without microretention observing marginal integrity in cavities with microretention specialy class III cavities), cavities class V with or without microretention show anfaurable results.

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 presents investigation shows the results of 480 cavities, trested with and without acid descalcification, during a control period of 18 months. The total of cavities were dividid acording its retention (microretention and without microretention observing marginal integrity in cavities with microretention specialy class III cavities), cavities class V with or without microretention show anfaurable results.