The aim of the present investigation was to evaluate the stability of
implants using resonance frequency analysis (RFA) relative to length,
diameter and arch location, at the time of implant placement and during
second-stage surgery. A total of 102 implants in 43 patients had been
measured for stability at the time of implant placement (49 implants),
and during second-stage surgery (53 implants). Radiographic examinations
were performed pre-operatively and following implant placement for
Group 1 patients and at second-stage surgery for Group 2 patients. The
implant stability for both groups was assessed by RFA (Osstell,
Integration Diagnostics AB, Göteborgsvägen, Sweden). For each
measurement, the transducer was placed perpendicular to the long axis of
the implant location and then secured with a torque of 10 Ncm as per
manufacturer instructions. The results showed implants at first-stage
surgery to have a mean stability of 66 ± 6.2 ISQ (range 52 to 79), and
implants at the second stage to have a mean stability value of 65 ± 6.2
ISQ (range 51 to 79). Mandibular implants appear to reach higher
stability values than maxillary implants at both first and second stage
surgery (P £ 0.05). A direct relationship was observed between implant
stability and implant diameter, however not between implant stability
and implant length
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