Although a smaller size field of view (FOV) of Cone-Beam Computed Tomography (CBCT) reduces radiation exposure, its effect on the accuracy of static computer-aided implant surgery (s-CAIS) remains unknown. This study aimed to evaluate the impact of the size of FOV on the accuracy of s-CAIS and to investigate if the arch affects this effect. A total of 32 implant sites on eight identical scannable models (maxillae and mandibles) were randomly allocated to two FOV sizes: test (5cm x 5cm) and control (10cm x 10cm). All models were scanned with an intraoral scanner (IOS). With the registration of the surface scan and CBCT image, a prosthetic-driven implant position was planned. Following the fabrication of surgical templates, a single-blinded surgeon placed all implants with the fully-guided s-CAIS protocol. IOS captured the implant positions with the scanbody attached. Implant planning software measured the angular deviation, 3D deviation at the crest, and 3D deviation at the apex between preplanned and actual implant positions. Two-way ANOVA was used to analyze the effect of FOV and arch on the deviations. The size of FOV did not show a significant effect (p > 0.198) on angular deviation, 3D deviation at the crest, and 3D deviation at the apex. No significant difference was found when comparing the effect of the size of FOV between the maxillary and mandibular implants. In conclusion, the use of small FOV CBCT demonstrated comparable accuracy of s-CAIS to the use of medium FOV CBCT.
Keywords: 24 FOV; ALARA; CBCT; digital workflow; guided implant surgery; virtual planning.