2). It should be noted that the forces may have different directions, and the reaction is only one. To determine the total (total) force on the part of all the forces of reaction have move three arrows (Rn1, Rn2, Rn3) at one point 'c' center of resistance to the axis of the root, but with a moment of force (Fig. 3). Connecting the beginning and end of a straight shooter, get the total force R (the fourth parameter of mechanical phenomena).

It is known that the stability of each tooth depends on the translational motion along the hole and the rotation - around the center of the axis of the root. The progressive offset by the strength of R, the position of which we have identified and determined by the sum of rotational torques with by 3 points (Fig. 4). Torque (M = RL) - this is the fifth most important parameter of mechanical phenomena, receipt of which is possible only after the determination of the previously described forces. At a ratio of 1:1, central protuberance ramps are located in side from the middle (Fig. 5A, B, AB, AD), and swallowing food fulcrum appearing on them, also located in the side (Fig. 5B), which is unfavorable, since this appears a lot of pressure (data Motsch, and in 3-3,5 times greater than for fragmentation as poor), which causes the zone of compression and tension, loosening the tooth. Despite this, the young and healthy patients forces supporting tissues are much higher than the value of stress arising from the act of eating.