Objectives This retrospective cohort study aimed to determine the prosthetic success
of overdentures supported by bar mesostructures on four dental implants, the survival
rate of the implants placed using static Computer Assisted Implant Surgery (sCAIS),
and the accuracy of implant placement. Methods Fully guided surgery was performed
to place implants in the edentulous jaws of patients enrolled following virtual planning.
Implant-supported overdentures were manufactured using a hybrid workflow. Patients
were scheduled for clinical and radiographical evaluations and oral hygiene treatment
at six-monthly intervals. The accuracy of implant placement was assessed by superimposing
the postoperative desktop scans and the virtual plans. Results In total 60 implants
were placed and 15 overdentures (11 maxillary and 4 mandibular) were delivered for
13 patients (10 male, 3 female; mean age: 69.3 ± 4.84 years) in this study. Patients
were followed up for 23.23 ± 11.79 months. The prosthetic success, cumulative implant
survival, and implant success rate were 100 %, 98.33 % and 93.33 % respectively. The
incidence of periimplantitis was 3.33 % and 7.69, the incidence of periimplant mucositis
was 28.33 % and 46.15 % on implant and patient level respectively. For the sCAIS procedures,
the angular deviation was 3.19 ± 1.73 °, coronal global deviation was 1.51 ± 0.68
mm, and apical global deviation was 1.56 mm (median); range: 3.77 mm. Conclusion Overdentures
supported by bar mesostructures on four dental implants placed using sCAIS demonstrate
a high rate of prosthetic success and a clinically acceptable incidence of biological
and biomechanical complications during the two-year follow-up. Clinical significance
Delivering an overdenture supported by a bar mesostructure on four dental implants
placed using sCAIS is a predictable treatment modality in the management of the edentulous
patient.
