A Clinical Resonance Frequency Analysis of Implants Placed at Dehiscence-type Defects with Simultaneous Guided Bone Regeneration During Early Healing.

PURPOSE To investigate the implant stability quotient (ISQ) values of implants placed in bone with and without dehiscence bone defects over 12 weeks and to compare the ISQ values between the two groups. MATERIALS AND METHODS Twenty-two patients with edentulous area at posterior mandible were enrolled. Thirty OsseoSpeed EV Astra Tech implants (Dentsply Sirona), 4.2 mm in diameter, were placed. Twenty implants were placed without bone regeneration (control group), while 10 presented with favorable bone defects and received simultaneous guided bone regeneration with dental implant placement (study group). At the time of implant placement, 2, 4, 8, and 12 weeks, resonance frequency analysis (RFA) was utilized. The changes in ISQ values within group were analyzed with repeated-measures ANOVA, and the mean ISQ values between the control and study groups were compared using unpaired t tests. RESULTS All implants were successfully integrated without complication. The control group demonstrated mean ISQ values of 74.30 ± 6.01, 69.58 ± 5.30, 71.10 ± 5.80, 75.08 ± 3.93, and 77.85 ± 3.18 at baseline, 2, 4, 8, and 12 weeks, respectively. The study group demonstrated mean ISQ values of 69.85 ± 7.00, 63.40 ± 8.47, 59.90 ± 10.23, 72.55 ± 3.10, and 76.20 ± 2.68 at baseline, 2, 4, 8, and 12 weeks, respectively. The study group showed significantly lower mean ISQ values at 2 weeks (P = .021) and at 4 weeks (P = .007) after implant placement compared to those of the control group. CONCLUSION Within the 12-week healing period, all implants demonstrated successful osseointegration and achieved stability in favorable bone defects. Nevertheless, clinicians should consider that significantly lower implant stability can occur in the first month.

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