Brackets change, wires evolve, diagnostic methods become more precise, but the LAWs that support Orthodontics are universal and immutable.
All appliances used in the past, and all appliances that will be developed in the future follow these fundamental laws. As an example, we cite the principle of the SIX GEOMETRIES, which explains the functioning of statically indeterminate systems. This knowledge is extremely useful for the activation of several orthodontic appliances, such as continuous and segmented arches, retraction loops, rectangular loops, root springs, transpalatal bars, and lingual arches.
In this video, we demonstrate an easy method to visualize the six classes of geometries.
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