Geostatics Principles In Minimally Invasive Exodontias

This study aims to develop a mechanical principle for reducing the crush injury of bone in tooth extraction.[Geostatics in minimally invasive surgical exodontias. West China J of Stomatology, 2017, 35(2):119 10.7518/hxkq.2017.02.002] This study was verified by IRB of West China Hospital of Stomatology (WCHSIRB-D-2020-323). The tooth and alveolar socket were considered as rigid body with definite shapes and sizes. The principles of geostatics were employed to analyze the retention of tooth roots following the theory of statically determinate structures. The principles of mechanics were applied to analyze dislocation of teeth following the theory of translatory motion and rotational motion. Those principles yield were verified in vivo if it suitable for tooth extraction. Considered as deep buried static structure, the constraint of tooth root are mainly determined by geometric shape, especially tooth root curvature and cross dislocation direction. The slope principle is useful to analyze the cause of the constraint and figure out the solution. In accordance with the theory of the rotation about point, the differential motion principle was suggested for dislocation of root without compressing sockets. A well-designed root-cutting would form a rotation center that made the root dodging the obstacle-point along the direction of the differential motion. The slope principle and the differential motion principle derived from geostatics theory is feasible for mechanical analysis of tooth extraction, and provide practicable solution for minimal tooth extraction.