https://doi.org/10.15344/2456-4443/2016/112
Abstract
Objective: to evaluate In Vitro and in vivo the accuracy and the precision of guided implant surgery, associated with three mini-implants placement used as precision pins.
Materials and Methods: For In Vitro evaluation, two acrylic resin model with artificial gum were prepared to represent edentulous mandibles. For the next in vivo evaluation two patients were treated using the same method. Three mini-implants used as reference points were placed before diagnostic and therapeutic procedure. Pre-and post-implantation CBCT images were superimposed using digital processing image software to evaluate the linear and angular deviations between the virtual planning data and the surgical results.
Results: In Vitro: The mean angular deviation between the virtual and actual positions of twelve placed implants was 2.4 degrees (SD 0.168). The mean depth deviation at the level of the implant shoulder (D1) was 0.23 mm (SD 0.021), the depth deviation at the implant center (D2) was 0.21 mm (SD 0.007), and the depth deviation at the level of apical point (D3) was 0.14 mm (SD 0.014). The mean shoulder mesial radial deviation (SMR) was 0.30 mm (SD 0.007), the mean shoulder distal deviation was 0.27 mm (SD 0.028), the mean implant center deviation was 0.21 mm (SD 0.17), and the mean apex radial (ARP) deviation was 0.15 mm (SD 0.021). and 0.27 mm (SD 0.19), respectively. The differences were found not statistically significant in vivo: The mean angular deviation between the virtual and actual positions of twelve placed implants was 3.0 degrees (SD 0.1167). The mean D1 deviation was 0.27 mm (SD 0.018), the mean D2 deviation was 0.29 mm (SD 0.041), and the mean D3 deviation was 0.17 mm (SD 0.019). The mean SMR deviation was 0.27 mm (SD 0.021); the mean SDR deviation was 0.34 mm (0.022) while the ARP mean deviation was 0.24 mm (SD0.248). The differences were found not statistically significant .
Conclusions: Results showed that the use of three mini-implants used as precision pin allows obtaining a promising accuracy in virtual implant placement.