RESUMEN
Ten patients with skeletal Class III malocclusion in the early mixed dentition who were treated with maxillary expansion appliance and protraction headgear were compared with reasonably matched controls. Significant orthopedic effects were found after as little as 6 months of treatment. Cephalometric analysis revealed that the correction of Class III malocclusion was primarily a result of forward and downward movement of the maxilla and backward rotation of the mandible. The clinical result of one patient treated with this appliance is used to demonstrate the importance of force magnitudes and directions, as well as the design of the appliance, to the success of the treatment.
Asunto(s)
Aparatos de Tracción Extraoral , Maloclusión de Angle Clase III/terapia , Técnica de Expansión Palatina , Cefalometría , Niño , Dentición Mixta , Femenino , Humanos , Masculino , Desarrollo Maxilofacial , Diseño de Aparato Ortodóncico , Ortodoncia Correctiva/métodos , Estudios Prospectivos , Valores de ReferenciaRESUMEN
In the epidemiological area of South Lower Saxony the prevalence of multiple sclerosis increased from 51/100,000 in 1969 to 99 in 1986. The mean annual incidence increased from 2.6 for the period from 1964-1974 to 4.6 for 1975-1985. This trend is significant (p = 0.0068). Diagnostic criteria, methods of case finding and analysis of the data remained stable. Minor necessary changes as for example due to new data protection laws and new handling of early cases by practising physicians can hardly explain this significant increase. In consideration of similar reports from all over the world biological exogenous factors are suspected but remain to be identified.