Development of a device to simulate tooth mobility

Abstract

Objectives: The testing of new materials under simulation of oral conditions is essential in medicine. For simulation of fracture strength different simulation devices are used for test set-up. The results of these in vitro tests differ because there is no standardization of tooth mobility in simulation devices. The aim of this study is to develop a simulation device that depicts the tooth mobility curve as accurately as possible and creates reproducible and scalable mobility curves. Materials and methods: With the aid of published literature and with the help of dentists, average forms of tooth classes were generated. Based on these tooth data, different abutment tooth shapes and different simulation devices were designed with a CAD system and were generated with a Rapid Prototyping system. Then, for all simulation devices the displacement curves were created with a universal testing machine and compared with the tooth mobility curve. With this new information, an improved adapted simulation device was constructed. Results: A simulations device that is able to simulate the mobility curve of natural teeth with high accuracy and where mobility is reproducible and scalable was developed.

Influence of abutment model materials on the fracture loads of three-unit fixed dental prostheses

“…1). The geometry for the tooth model was based on a dental anatomy textbook and on the measurements of a tooth mobility simulation device presented in a previous study [17][18] . The abutment teeth were modelled according to a standard three-unit FDP design utilizing complete crown preparations with a 0.85 mm deep chamfer margin design, an occlusal reduction of 1.7 mm and a total convergence angle of 5°.…”

Effects of Differing Thickness and Mechanical Properties of Cement on the Stress Levels and Distributions in a Three‐Unit Zirconia Fixed Prosthesis by FEA

“…The constituents of the virtual model are presented in Figure . The geometry for the tooth model was based on a dental anatomy textbook and on the measurements of a tooth mobility simulation device presented in a previous study of the authors . The following anatomic measurements were employed: span between both abutment teeth = 7 mm; lengths of the roots = 16 mm; crown/root ratio = 0.43.…”

A new CAD/CAM tooth mobility simulating model for dental in vitro investigations

“…When comparing the presented model to previous models, it is noticeable that it is distinguished by its design and the related concept of tooth mobility simulation. Tooth mobility was previously adjusted by generating space circumferential to the root, which was then filled with elastic materials such as A-polyvinylsiloxane [ 8 , 9 ], polyether [ 4 ], silicone [ 5 , 10 , 11 ] or latex-based rubber [ 6 ] to simulate the PDL. This space is usually created by applying a wax layer to the roots before the corresponding socket is produced.…”

“…This space is usually created by applying a wax layer to the roots before the corresponding socket is produced. Tooth mobility can then be adjusted by changing the wax thickness [ 5 , 8 , 14 ]. However, this technique seems time consuming and is shown to be inconsistent in PDL thicknesses, ranging from 0.00 mm to 0.42 mm [ 6 ].…”