Numerical Analysis of the Influence of Surface Modification on the Bond Strength Between a Single Incisal Tooth with a Removable Partial Denture Metal Framework

摘要

Felling out of single incisal tooth from the acrylic base plate in case of removable partial denture metal framework is an important problem for dental technicians. It happens multiple repairs in a short time. Definitely shorter than denture usage time is determined. That is why computer simulations of two static test of load force like in the biting process and tensile strength test was conducted. Literature review shows that some of the technicians use mechanical surface preparations which are different shapes of grooves for improving the bond connection between tooth and base plate. Five 3D models were made: round, diatoric cavity, V-shape, T-shape, and no groove. Stress distributions and deformations were analyzed in every case. This research shows that grooves did not influence stress and deformations. Maximum deformations appeared on incisal edge, and it was 0.02 mm at every biting simulation and 0.007 mm at all tensile strength tests. However maximum stress was recorded in the area of the base plate, which overlap on tooth both in biting simulations as well as in case of tensile strength tests. Moreover, maximum values did not exceed 19.5 MPa in the first case and 12.3 MPa in second tests. However, even the highest values do not exceed the strength of PMMA- the location of maximum stress can happen fell out a tooth at the time of regular dynamic loads.