Evaluation of osseointegration and screw loosening by modal analysis

2016 Fiscal Year Final Research Report

• Project/Area Number: 26670830
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Prosthodontics/ Dental materials science and
• Research Institution: Tohoku University
• Principal Investigator: Ogawa Toru 東北大学, 歯学研究科, 准教授 (50372321)
• Research Collaborator: MIYASHITA MAKIKO
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 歯学 / インプラント / オッセオインテグレーション / 共振周波数解析

Outline of Final Research Achievements

The aim was to examine the progress of implant osseointegration and screw loosening by means of a resonance frequency analysis (RFA) in the rabbit tibia.
One mature New Zealand White rabbit was used. Six titanium implants were installed in the tibiae bilaterally. A small 3D-accelerometer was mounted and screwed onto the implant, and flexural oscillation was directly applied to the implant to obtain the RFA values (RFx and RFy). ISQ value with Osstell was also measured immediately after implantation. After 8 weeks, RF values of different screw loosening were recorded. ISQs tend to decrease until 7 to 10 days after installation and then gradually increased. RFx and RFy had not reached the stage in predicting the progress of osseointegration. According to degree of screw loosening, the RF values decreased.
The results suggest that although this RFA method have not been enough to detect the progress of osseointegration, it can be used for the detection of the screw loosening.

Free Research Field

歯科補綴学