A Study on Stress Analysis of Dental Implants Considering Contact between Upper and Lower Teeth
○Dental implant
It is one of the treatments for people who have lost their teeth.
It has excellent esthetics and functionality, and allows the patient to chew with the same sensation as healthy teeth.
Dental implants consist of an abutment to which the superstructure (artificial tooth) is attached and a fixture that is placed in the jawbone (Figure 1).
Figure 1 Schematic diagram of a dental implant [1].
The stresses generated in the 3D model of the jawbone are simulated and evaluated by adding material properties and constraint conditions to the model.
→It allows visualization of stress distribution at the time of implant placement and is a very important process in implant design (Figure 2).
Figure 2: Stress distribution diagram of mandible with vertically placed implants[2]
The actual meshing of the teeth is not constant. The contact points change with each bite, such as one- or two-point contact(Figure 3).
Figure 3: Example of occlusion [3]
○Research Objectives
Most conventional studies do not consider the contact conditions of the teeth, and there are few comparative studies of the stress effects on the mandible caused by the contact conditions of the corresponding maxillary teeth when implants are placed in the mandible.
In this study, we investigate the stress distribution in the jawbone at the time of implant placement, taking into account various contact conditions. In the experiment, as shown in the figure below, an actual healthy tooth model is used to investigate the effect of loading from the upper teeth on the mandible by changing the contact points through stress simulation(Figure 4).
Benefits of Analysis
(1) It is expected to help patients understand the effects of post-operative occlusion.
(2) Based on the data from stress analysis, we can contribute to improve the quality of maintenance.
Figure 4: Examples of experiments in our study [4]
○Slide
[1]Forte Takasaki Mall Dentistry
https://ftdc.jp/worries/worry8//i-ct
[2]Effects of Diameter and Length of Implant Body on Stress Distribution in the Mandible-", Hokkaido Journal of Dentistry (2012)
[3]Basic periodontal therapy
https://www.ne.jp/asahi/fumi/dental/perio2/ip/oa.html
[4]iStock
https://www.istockphoto.com/jp