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[The suprahyoid muscles and functional appliances].

Once it is reviewed orthodontic literature about functional appliances ways of acting, there is exposed another factor that could influence mandibular growth, that is suprahyoidic muscles. Depending on their balance or unbalance they will increase or decrease growth. This is an hypothesis because experimental evidence is difficult. Physiology of the muscles is commented. There are also described their functions and their undoubtable relationship with the tongue. The conclusion is that from the therapeutic point of view this muscles can be adjusted with tongue re-education or using functional appliances with advanced jaw position in the constructive bite. Finally, three cases are exposed, studying what has happened to hyoidic bone once the treatment has been performed.