ARTÍCULOS CIENTÍFICOS

ORTOPEDIA MAXILAR

PROF. DR. DIETMAR SEGNER
Orthopedics
Ex-Director Department of Maxilary Orthopedics,University of Hamburg
Frankfurt, Germany.

A12.) The Bimaxillary Hansa-Appliance- A highly efficient functional appliance

Functional appliances are many and varied. Probably no other orthodontic appliance shows a greater diversity in form and philosophy. While there seems to be some redundancy among the different appliances the complex situation of forces, force directions, soft tissue pressure, and neuromuscular function makes some modern improvements and modifications sensible.

The Hansa-Appliance was introduced by Prof. Asbjorn Hasund as one of the most effective and versatile of the modern functional appliances. In addition to the effect of classic functional jaw orthopedics the appliance utilizes lower lip pressure, eliminates dysfunctions of the mentalis muscle, controls the vertical position and inclination of the maxilla, adjusts the transverse width of the maxilla, controls incisor inclination, and also can be made to work especially fast. All this can be accomplished with an appliance that is robust, can be activate, and shows good patient comfort.

The fabrication and usage of the appliance is explained as is the timing of the treatment. Because of its high effectiveness the appliance can be used at an age where the compliance of the patient is optimal, which is often before the pubertal growth spurt. Long term evaluations of its treatment effect as compared to a control group of non-treated control children with a Class II malocclusion are shown.

November 27, 1998 AMOM A.C

Individualized Cephalometrics

Cephalometrics analyses are widely used in orthodontics. Nevertheless, they often display shortcomings. Either they are conventionally oriented on population standards such as means and standard deviations or the more advanced methods such as mesh grid or tensor analysis are rather awkward in the clinical application, It is the aim of the present study to present an easily applicable method that is based on the fact that it is more important for a patient's cephalometric variables to harmonize with each other intra-individually rather than to fit some population mean.

Based on a trans-European sample of 275 young adult patients with and ideal occlusion 20 cephalometric variables were measured and used to describe the skeletal morphology.

The results showed good reproducibility of the measurements. It could be shown that many of the subjects under investigation were not even close to the population mean although aff of them had excellent occlusion. Thereby the necessity of individual norms as opposed to population means could be proven. It was then possible to prove highly significant correlations between the skeletal variables,. Combinations of values for these variabes that harmonized optimally could be given and used as a patient's own intra-individual standard.

The method allows for inter-individual variability but nevertheless gives accurate indications of a skefetal abnormality and thus enhances the diagnostic value of roentgen cephafograms. Thereby cephalometrics finally becomes an all important aid in successful treatment planning.

November 28,1998 AMOM.A.C.

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