Objective: Implant stability is necessary for long-term success in implant treatment. However, there are few scientific evaluation methods for implant stability detection. In this study, implant stability was to evaluate and compare the by the resonance frequency analysis,Osstell L-shaped transducers (Integration Diagnostics, Göteborg, Sweden) and Implomates impulse transducers (Biotech One, Taipei, Taiwan)in vitro . Methods: There were 4 parameters, the direction of the transducer, the force of implant clamping, the height and the interface of dental implant to be evaluated in the 2 different systems. 5 detections were done for the each parameter. In the direction, the clamping axis and perpendicular axis and their bisector were evaluated. In force, 2, 4, 6, 8, 10 N-cm were applied. In height of implant exposure, 0, 2, 4, 6, 8 mm were evaluated. Gypsum, plaster, paraffin wax, self-curing resin and light-curing resin were designed to stimulate the interface between bone and implant.The data were analyzed by student t-test. Results: In the direction parameter, the mean ISQ value was 84.63 ± 2.07 (range 82 to 86), and kHz value was 14.75 ± 0.03 (range 14.7 to 14.8). When force changed, the ISQ value also increased from 86 to 89 and the kHz value range 14.76 to 15.11. The longer the implant exposure, the ISQ and kHz value decreased (ISQ from 88 to 58 and kHz from 16.1 to 5.29). In different interface, the ISQ and kHz value changed (Gypsum: 82 ISQ and14.16 kHz, plaster: 78 ISQ and 12.59kHz, paraffin wax: 74 ISQ and 11.63 kHz, self-curing resin73 ISQ and 11.58 kHz and light-curing resin67 ISQ and 9.92 kHz).Conclusion: the result showed the direction of the detecting transducer placement influence the data of Osstell. And the accuracy of the 2 detecting systems can be reached to evaluate and quantify the dental implant stability.

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