Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices—a FEM study

Progress in Orthodontics

Table 5 Stresses on PDL in Mega Pascal in group I and group II in consolidation models

		Von Mises stresses					Principle tensile stresses					Principle compressive stresses
	Implant height (mm)	C.I	L.I	C	PM	M	C.I	L.I	C	PM	M	C.I	L.I	C	PM	M
Group I	7	0.004	0.016	0.011	0.004	0.004	0.003	0.003	0.013	0.005	0.003	0	0	0	0	0
	10	0.002	0.017	0.013	0.004	0.004	0.004	0.003	0.013	0.003	0.003	0	0	0	0	0
	13	0.002	0.017	0.011	0.002	0.002	0.004	0.003	0.013	0.003	0.003	0	0	0	0	0
Group II	7	0.002	0.003	0.002	0.002	0.009	0.003	0	0	0.011	0.001	0	0	0	0	0
	10	0.004	0.017	0.013	0.004	0.002	0.004	0.003	0.014	0.003	0.002	0	0	0	0	0
	13	0.004	0.017	0.013	0.003	0.002	0.004	0.003	0.013	0.003	0	0	0	0	0	0

Inference: C.I central incisor, L.I lateral incisor, C canine, PM premolar, M molar
Group I: Highest von Mises stress are observed in laterals (0.017) at 10- and 13-mm implant height followed by canines at 10-mm implant height (0.013) and centrals at 7-mm implant height (0.004). Principle tensile stresses are more in canines in all models (0.013) and no compressive stresses registered
Group II: Principle tensile stresses are high in premolars in 7-mm implant height model (0.011) and von Mises stresses are more in 10- and 13-mm implant height models in laterals (0.017) and canines (0.013). Principle tensile stresses are more in canines in 10- and 13-mm implant height models (0.014 and 0.013, respectively), and no compressive stresses are observed