2012 Volume 25 Issue 4 Pages 708-716
Objective: Primary stability is essential for achieving osseointegration after bonding an implant to the marginal bone. Successful implant osseointegration can be determined by assessing the relationship between preoperative bone quality and initial stability. We investigated the clinical and statistical relationship between bone analysis by preoperative CT images and implant mobility.
Methods: The periotest (PT) value was measured in the teeth of 64 patients (31 men, 33 women) who had preoperative CT scans between October 2007 and March 2011. We used CAMLOG implants. PT-values were measured using the following Periotest. CT scan devices: Aquilion16, Aquilion32, Asterion, and LightSpeed Ultra16. CT-number of the stent with gutta-percha points attached to the patient during scanning was converted into measurements. Cortical bone CT-number (CHU), cortical bone thickness (CW), and cancellous bone CT-number (SHU) were measured at the implant site. These numbers were compared to the PT-value of an implant body placed in the same site.
Results: The overall median PT-value was －3.0. CHU was 1,048.1 HU, CW was 1.3 mm, and SHU was 581.0 HU. PT-value showed a strong correlation in the cortical bone. Correlation coefficients were rs=0.51(CHU) and rs=0.70 (CW) .
Conclusions: CT-number and thickness of the cortical bone were correlated with initial implant mobility. In preoperative CT scanning, measuring the CT-number and thickness of the cortical bone around an implant is effective for determining the stability of the implant osseointegration.
