Abstract
BackgroundImplant‐supported restorations in the posterior region are subjected to various complications that could be prevented by changing either the design or the material.PurposeThe 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 MethodsThirty 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.ResultsAll 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.ConclusionFull‐contour zirconia implant‐supported restorations with angulated screw channel abutments in the molar region have an excellent clinical performance after 1 year of function.
Highlights
Dental implant survival in cases of replacement of single missing teeth in the posterior region of the maxilla and mandible is high.[1]
A recent prospective clinical study evaluating the retention of single restorations with angulated screw channel abutments has reported favorable results without major complications.[11]
Full-contour zirconia implant-supported restorations with angulated screw channel abutments in the posterior region exhibited an outstanding performance with a 1-year restoration success of 100% according to the United States Public Health Service (USPHS) criteria, paired with a 100% survival of the implants
Summary
Dental implant survival in cases of replacement of single missing teeth in the posterior region of the maxilla and mandible is high.[1]. Screw retention of implant restorations eliminates the risk of cement remnants and subsequent soft tissue complications.[8] Loosening of screws could be minimized by an internal conical connection between implant and abutment.[9] The possibilities for screw retention in the posterior region, can be hindered by off-axis inclination or position of the implant when the location of the screw access opening of the restoration would be interfering with occlusion, articulation, or marginal thickness of the restoration This could be of functional or aesthetic concern or could weaken the restoration; as an alternative to the traditional straight screw channel, the angulated screw channel has been developed.[10] A recent prospective clinical study evaluating the retention of single restorations with angulated screw channel abutments has reported favorable results without major complications.[11]. 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
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