Resonance frequency analysis with Ostell is a non-invasive method to evaluate the bonding between the implant and the surrounding bone. Although transducers for widely used implants system (Bronemark, ITI, 3i, Astratech, etc.) are available, these transducers cannot be applied to other implant systems such as AQB implant, which is hydroxyapatite coated implant made in Japan. Objective: The purpose of this study is to develop resonance frequency analysis system for AQB implant and to examine the validity of this system. Methods: The custom abutment, which connects the implant of AQB two-piece system with the transducer (type A1) for standard abutment of Bronemark and 3i systems, was designed and manufactured. The implant with abutment and the transducer was inserted into the solidifying plaster and ISQ value was measured with Ostell. Thirteen implants were placed in the proximal regions of the tibias of three mini-pigs (12 months, male) and each animal was sacrificed at 1, 2 and 4 weeks after the surgery. ISQ values were measured and then resin-embedded sections were prepared. Bone bonding length of each implant was histomorphometrically measured. Results: The ISQ value of the implant in the solidifying plaster gradually increased and reached the plateau when the plaster completely solidified. In the animal experiments, the ISQ value correlated with the bone bonding length (r=0.736029, p=0.0041). Conclusion: Resonance frequency analysis with our scustom abutment can evaluate AQB implant fixation in bone.

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