Comparison of Stability of Implants Inserted in Ridges Augmented with Mineralized Cortical Cancellous Allograft Blocks with Implants in Native Bone Using Resonance Frequency Analysis

Lateral ridge augmentations are traditionally performed using autogenous bone grafts. However, the bone harvesting procedure, whether intra orally or extra orally, is accompanied by patient morbidity. So, applying bone substitute has been suggested. The aim of the present study was to compare the stability of implants in ridges augmented with mineralized cortical cancellous allograft blocks with implants in native bone using Resonance Frequency Analysis. In this clinical trial study, approved by ethical committee of Mashhad university of Medical Sciences, nine subjects with insufficient ridge width were selected. Their ridges were augmented with mineralized cortical cancellous allograft blocks. After 6 months, implants were inserted. In control group, 9 subjects with sufficient ridge width were selected. Implants were inserted in the same place as the test group. ISQ was used for measurement of implants stability on third and sixth month after implants placement. Data were analyzed by paired and two sample t tests using SPSS version 15 software. During the study period, two implants in allograft group failed. In the test group, the difference between mean ISQ at third and sixth month was statistically significant (P=0.008), but in the control group, it was not significant (P=0.065). At third month, the mean ISQ between 2 groups was not statistically significant (P=0.317), but at sixth month, the mean ISQ in control group was significantly higher than the test group (P=0.000). The mean ISQ in both groups were enough to load the implants. This means that mineralized cortical cancellous blocks could be used as a scaffold for growth of the bone and ridge augmentation for implant placement.