Determining the primary stability of dental implants by numerical calculation

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Pammer Dávid Zoltán
Department of Materials Science and Engineering

The theoretical basis of dental implantology was studied, as well as the overall structure and types of implant stability during the semester work. The implant stability measuring machines were presented, which are often used for clinical measurements and also those, which are used in laboratories by engineers.

I used finite element analysis to simulate the stresses in bone tissue. I tested the geometric parameters of an implant which can have effect on primary implant stability, and determined each one’s characteristics. These characteristics can show us the ideal, stress optimized ranges of the mentioned parameters. Starting from the optimized parameters I have planned an implant and compared it’s stress distribution to other implant which are available in the market. A new method was developed to evaluate the implant’s primary stability using finite element analysis (FEA). The method is based on the investigation of a biomechanical property, the implant’s micro mobility, which is in non-linear connection with the ISQ factor (Implant Stability Quotient). ISQ is the most commonly used factor by the dentists to describe the implant stability. The simulated results were compared with the hand measured ISQ values.

As an in vitro study, 3 simplified implant models were placed in each one of various bone blocks. The implantation and the following measurements were carried out with an Instron 5965 type tension testing machine. The insertion torque diagrams were registrated. After that FEA simulations were performed on the simplified implant model, as well as the equivalent mechanical test and the hand measurements with an Osstell® machine. The simulated, measured (both Osstell® and mechanical measurements) data were compared to each other to qualify the basic principles of the new method.

I have proposed a new system for stability measurement, which is based on the measurement of micromobility. I have managed to create a basic model for this instrument.


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