摘要: Patient education has become an integral part of effective dental treatment.1 Prop erly educated patients are eager for and capable that cooperation which may make the .difference between success failure in treatment.2 Visual aids have long been known utilized by profession.3 The dynamic model combines both visual tactile sensation. By utilizing patient par ticipation with these sensory appeals, can ideal aid toward perception understanding complex procedures. “ effects be arrived at mathematically,” Bar rett4 stated, but actual illustrations conditions most readily under standable.” T o this end three models were constructed used to present many phases occlusal equilibration or adjustment also as presenting etiology, course, prognosis treatment5 peri odontal disease. Models elastic materials repre senting periodontal membrane heretofore study changes within a result stress applied teeth. Schwartz6 using rub ber bands represent membrane. author later rubber dam material. Sorrin (with author’s collaboration) model, sponge elastic, illustrating tension com pression, earlier lacked, order demonstrate perio dontal resulting from stress. Barrett* polarized light special photoelastic material representing visualize exact sites compression tension. All described, any ingenuity devise, value. described chosen their wide scope useful ness, simplicity, because they illustrate how use such rather than use. These easily out available every office pur chased readily. They all tooth teeth, cardboard balsa wood, attached staples is made its own alveolar socket.