In Volume 4 of the "Encyclopedia..." (Multivolume Manual of Dentistry...) the author continues to develop materials concerning topical problems of dentistry (in particular, dento-mandibular anomalies and deformities), focusing the readers' attention on the functional aspects of this problem. This direction is relevant not only for Ukraine (where events that may be accompanied by such clinical symptomatology are directly occurring), but also for the entire world community.