Some somatic pathologic muscular and neurologic conditions in stomatology are difficult to differentiate. For example, the myofascial pain dysfunction syndrome, trigger point muscle pains and a number of temporomandibular joint related pathoses often cause diagnostic difficulties. With the purpose to assist general clinicians and students to understand and differentiate more easily these difficult occasions, the authors try to offer a model simulating the decision-making process in some of the aforementioned pathoses. The model is based on the Generalized Nets Models which represent extensions of Petri's nets and their modifications.