Randomized controlled trial on the efficacy of a custom-made, fully guided implant system for flapless crestal sinus floor elevation: Accuracy and patient-reported outcomes

Objective: To compare fully guided flapless implant surgery using a light-cured surgical guide (FG group) with partially guided open flap surgery (PG group) in the posterior maxilla when performing simultaneous sinus floor elevation in terms of the accuracy, time requirements, and patient/clinician-reported outcomes (PROMs and CROMs). Materials and Methods: In this study, 56 tissue-level implants were placed with crestal sinus floor elevation in 56 patients at single-tooth sites, with 28 implants allocated to the PG group and 28 to the FG group. The deviations of the placed implants from the virtually planned positions were measured at the implant platform and apex and for the angular deviation. The presurgical preparation time and the duration of surgery were measured. PROMs and CROMs were made by administering questionnaires at multiple time points. Results: Horizontal deviations at the platform and apex and the angular deviation were significantly smaller in the FG group than the PG group (p <.05). Presurgical preparation and surgery times were significantly shorter in the FG group (p <.001). Patient satisfaction and willingness to receive repeat treatment were significantly better in the FG group than in the PG group (p <.005 and.025, respectively). Clinicians were more satisfied in the FG group than the PG group (p <.05). Conclusion: When placing an implant with sinus floor elevation, the flapless approach using a fully guided surgical system can be more accurate, faster, and increase the satisfaction of both the clinician and patient compared to the partially guided surgery.