Influence of superstracture materials for resonance frequency analysis

2001 Fiscal Year Final Research Report Summary

• Project/Area Number: 11671956
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 補綴理工系歯学
• Research Institution: Nihon-University
• Principal Investigator: HAGIWARA Yoshiyuki Nihon-University, School of Dentistry, Lecturer, 歯学部, 講師 (00228389)
• Project Period (FY): 1999 – 2001
• Keywords: Resonance frequency analysis / FFT Analyzer / Fast Fourier Transform / Vibration time / Frequency power spectrum / Implant / Abutment / Superstructure

Research Abstract

Achievement and maintenance of implant stability are prerequisites for long- term positive outcomes for osseointegrated implants. Thus, implant stability is the key to clinical success. Currently available clinical methods to determine implant stability and osseointegration are relatively crude and may entail percussing a fixture and abutment with Periotest. Radiographs are of value, but a standardised technique is necessary to ensure repeatability. This investigation was designed to study the application of a test method using resonance requency analysis to make quantitative measurements of the stability and shock transmission to the implant body influenced abutment type, torque force and different materials with superstructure.
A threaded type implant (3i ; 3.75 mm diameter, 13. 0 mm length) was mounted in die stone. Conical and UCLA abutments were connected to implant with 5, 10, 20 and 32 Ncm fastening torque force and gold crowns were also affixed. The vibration pattern, vibration time and frequency power spectrum were measured by an accelerated pick up sensor which was attached to the crown and Fast Fourier Transform Analyzer. Conical and UCLA abutments obtained same tendency for higher tight force demonstrated short vibration time and high peak frequency area. ANOVA shows significant effects of abutment fastening torque force, types of abutment shape and superstructure engagement (segment and non-segment) for the resonance frequency. Influence of superstructure materials for resonance frequency analysis demonstrated no significant different between PFM, Estenia and cold cure resin crowns on the conical abutment, for vibration time and frequency peak spectrum. But in case of UCLA abutment, superstructure materials for resonance frequency analysis was significantly difference between in PFM with cold cure resin and Estenia with cold cure resin for vibration time and frequency peak spectrum. In concluded the clinical point of view, material selection for the UCLA abutment should be considered in tight bite, parafunction and group functioned occlusion cases.