Accuracy evaluation of digital surgical template in angled implantation in the maxillary posterior region

To evaluate the accuracy of digital surgical guide in tilted implant in the maxillary posterior region.

Jaw data from 14 patients were scanned using cone beam computed tomography (CBCT), and digital models were acquired by scanning maxillary plaster models. Implant software was employed to process jaw data and digital models in order to design the surgical template. Then the stereolithographic (SLA) surgical template was created to guide the surgery. After that CBCT data was collected again and compared with the data collected before. Deviations between the actual implant position and the planned implant position were analyzed.

Central deviation at the hex and apex between the actual implant and the planned implant was almost constant with a mean of (0.625 ± 0.183) mm and (0.820 ± 0.208) mm. Mean value of horizontal deviation at the hex was (0.314 ± 0.070) mm, horizontal deviation at the apex was (0.509 ± 0.139) mm, vertical deviation at the hex was (0.538 ± 0.178) mm, vertical deviation at the apex was (0.638 ± 0.178) mm.

Angled implantation in the maxillary posterior region can reduce risks and trauma as well as the difficulties and duration of surgery. However, our data suggested that significant deviations existed in the actual implant position and the planned implant position.