Full‐zirconia single‐tooth molar implant‐supported restorations with angulated screw channel abutments: A 1‐year prospective case series study

Abstract

Background Implant‐supported restorations in the posterior region are subjected to various complications that could be prevented by changing either the design or the material. Purpose The aim of this prospective case series study was to evaluate full‐zirconia implant‐supported restorations with angulated screw channel abutments in the molar region of the maxilla and mandible and their effect on hard and soft peri‐implant tissues, during a 1‐year follow‐up period. Materials and Methods Thirty consecutive patients with a single missing molar, sufficient bone height, and implant site free of infection were included. Each patient was to receive a parallel‐walled implant with conical connection according to a two‐staged surgical protocol. After 3 months, a full‐contour screw‐retained zirconia restoration with angulated screw channel abutment was provided. Clinical and radiographic examinations were performed 1 and 12 months after placement of the restoration. Patients' satisfaction was scored prior to treatment and after 12 months with the restoration in function. Primary outcome measure was success of the restoration. Results All patients could be evaluated after 12 months. Success of the restorations was 100%. From loading to the 12‐month follow‐up, the mean marginal bone loss was 0.16 mm (SD: 0.26). Mean scores for plaque, calculus, peri‐implant mucosa, bleeding, and pocket probing depth were low, depicting healthy peri‐implant conditions. Patients' satisfaction was high and had improved after treatment. Conclusion Full‐contour zirconia implant‐supported restorations with angulated screw channel abutments in the molar region have an excellent clinical performance after 1 year of function.

Clinical, radiographic, and immunological evaluation of angulated screw‐retained and cemented single‐implant crowns in the esthetic region: A 1‐year randomized controlled clinical trial

“…No significant difference of MBL between the AG and CG was observed during the 1-year observation period (0.17 ± 0.39 mm vs. 0.19 ± 0.32 mm, p = 0.833). Similar results have been reported in previous studies, 22,34 where the MBL of angulated screw-retained restorations ranged from 0.16 to 0.41 mm, respectively. This indicates that both angulated screw-retained and cemented implant restorations can achieve stable marginal bone level in the short term.…”

Influence of Screw Channel Angulation on the Fracture Resistance of Zirconia Abutments: An In Vitro Study

“…A total of 42 implants out of 49 required ASC abutments, based on surgical technique due to bone availability and probably laboratory technician design considerations. Another prospective study was presented by Pol et al 10 with ASC in the posterior region for single‐tooth molar rehabilitation. This prospective study consisted of 30 implants placed in the posterior maxilla and mandible followed by restoration with full contour zirconia restorations with ASC abutments.…”

The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis

“…Only a few in vivo reports have reported on these restorations, and their results hint that this system can provide satisfying success and survival rates, even if at short follow-ups [21,29].…”

“…Few clinical reports have reported on the efficacy of ASC in single crowns (SC) and Fixed Partial Dentures (FPD), but these preliminary results show that these restorations, even if at a 1 year follow-up [21,22], can provide a satisfactory result. Some in vitro studies have reported that as the channel is not perpendicular to the implant, which may receive off-axis loading, the rate of mechanical complications could possibly be higher than conventional, screw-retained, FPD.…”