Assessment of Deviations of Implants Installed with Prototyped Surgical Guide and Conventional Guide: In Vitro Study

Objective:  The study aimed to assess the angular and linear deviations of implants installed in mannequins aided by surgical guides produced with the techniques of dual tomography (DT), model-based tomography (MT), and nonprototyped guide.

Materials And Methods:  Implants were installed in mannequins of a partially edentulous maxilla and divided into three groups: Group C ( = 20), implants installed using the conventional technique with flap opening and conventional guide; Group DT ( = 20), implants installed using guided surgery with the dual tomography technique; and Group MT ( = 20), implants installed using the model-based tomography technique. After implant installation, the mannequin was subjected to a computed tomography (CT) to measure the linear and angular deviations of implant positioning relative to the initial planning on both sides.

Results:  There was a higher mean angular deviation in group C (4.61 ± 1.21, ≤ 0.001) than in groups DT (2.13 ± 0.62) and MT (1.87 ± 0.94), which were statistically similar between each other. Similarly, the linear deviations showed group C with the greatest discrepancy in relation to the other groups in the crown (2.17 ± 0.82,  = 0.007), central (2.2 ± 0.77,  = 0.004), and apical (2.34 ± 0.8,  = 0.001) regions.

Conclusion:  The techniques of DT and MT presented smaller angular and linear deviations than the conventional technique with the nonprototyped guide. There was no difference between the two-guided surgery techniques.