“…For the physical modal parameters of the mechanical model, we have used the modal elastic constants and the modal damping constants k μ and c μ , respectively, where μ =1,..., n (where n is the number of DOFs of the system), or the modal reduced frequency and the modal damping factor p μ and ξ μ . These can be considered the elastometric parameters which characterize the status of the tooth-PDL tissue system [ 32 , 33 ], affected in a certain degree by parodonthosis [ 34 ]. An experimental method based on the free response analysis was utilized in order to obtain these parameters.…”