Journal of Prosthodontics News
An In Vitro Assessment of the Accuracy of Guided Tilted and Axial Implant Placement in the Edentulous Mandible
Now online in the Journal of Prosthodontics an in vitro assessment of implant accuracy co-authored by ACP members, Chao-Chieh Yang, DDS, MSD and Wei-Shao Lin, DDS, PHD, MBA.
The aim of this study was to assess the precision of implant placement when comparing tilted orientations to axial orientations, utilizing a fully guided surgical protocol in an edentulous mandibular model.
Fourteen rubber-coated mandibular models were scanned with fiducial markers using a commercial benchtop surface scanner, followed by cone beam computed tomography for implant planning through a dual-scan protocol.
In the control group, each model was planned for four axially oriented implants. The experimental models included two axially oriented implants near the lateral incisors and two posteriorly tilted implants at a 30-degree angle. A mucosal-supported, pin-retained surgical guide was designed and 3D-printed, facilitating the fully guided implant placement. All implants received scan bodies and were rescanned for evaluation of the trueness between the planned and the actual implant location using the implant planning software.
Tilted implants demonstrated comparable accuracy to axial-oriented implants in the mandible in terms of angular deviation (p = 0.7001), offset at base (p = 0.6409), and offset at tip (p = 0.6931). These findings suggest that tilted implants can be reliably used to avoid critical anatomical structures, provided that careful treatment planning and precise surgical guide fabrication are conducted.
Freeman BC, Alqallaf H, Yang C-C, Lin W-S, Dutra V, Hamada Y. An in vitro assessment of the accuracy of guided tilted and axial implant placement in the edentulous mandible. J Prosthodont. 2025; 1–8. https://doi.org/10.1111/jopr.14037
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