Objectives:This study was performed to evaluate RFA value changes in two-stage surgery group and one-stage surgery group in patients.

Methods:Forty-seven mandibles in consecutively implant installed patients were selected for this study and 141 fixtures were installed. Ninety-three fixtures were double threaded, machined surface design (Br?emark?MK III, Nobel Biocare AB, G?eborg, Sweden) and 48 fixtures were root form, threaded, HA-coated surface one ( ReplaceTM , Steri-Oss/Nobel Biocare AB, USA). Among those, each 10 fixture was installed in one-stage group patients. ISQ values were measured using OsstellTM (Integration Diagnostics Ltd. Sweden) during fixture installation, at healing abutment connection and in the loading period for two-stage surgery group patients and during at each 4, 6, 8, 10, 12week and in the loading phase for one-stage surgery group patients and evaluated the changes according to the time and fixture type.

Results:In two stage surgery group, means of ISQ values of machined surface implants were 76.85,75.76,75.73 and those of HA-coated surface implant were 75.05, 77.58, 78.32 during fixtures installation, at healing abutment connection and in the loading period, respectively. In one-stage surgery group, the ISQ values of machined surface and HA-coated surface implants decreased until 4 or 6 week and maintained at plateau for 1-3 week and increased to the loading period.

Conclusions:Machined surface and HA-coated surface implants showed minimal ISQ changes with time if they were installed at the sites showing at least intact cortical plate and good bone qualities. However, HA-coated implants had a tendency to show somewhat increased ISQ values with time.

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