[The importance of the choice of materials and their design for the efficacy of orthodontic appliances].

The aim of this study is to stress the importance of correct selection of materials for orthodontic appliances, and thereby emphasize the functional relationship between choice and use of material. The outlined state of the art is the result of carefully-conducted research, the development of which has been briefly mentioned; however, the type of problem resulted from critical observations by orthodontic practitioners who apply the research results for the benefit of their patients.