A prospective study on single tooth reconstructions using parallel walled implants with internal connection (NobelParallel CC) and abutments with angulated screw channels (ASC)

Abstract

Background A new implant design was launched in 2015 with internal connection allowing for placement of abutments with angulated screw channels. Such devices may eliminate the use of nonauthentic components, which may present with poor fit and jeopardize the construction. It may also eliminate the use of cemented single‐crowns with the risk for excessive cement to cause marginal bone destruction. Purpose To evaluate the outcome of a straight‐walled implant with conical connection (NobelParallel CC), when used in the single‐tooth situation of the anterior maxilla. Further, to elucidate the need for an abutment with angulated screw channel (ASC). Materials and Methods Patients referred for both implant surgery and prosthetics to rehabilitate missing single maxillary incisors/canines. Implants were placed according to a two‐staged surgical procedure. Patients were followed up to delivery of prosthetic crowns with the purpose to extend the study up to 1‐, 3‐, and 5‐year follow up. Registrations of implant survival, marginal bone level measurements, hard/soft tissue complications, and the incidence of ASC to avoid the use of nonauthentic components or crown cementation, were performed at the end of the study. Results A total of 47 patients were included in the current investigation. One patient deceased during the study period. In all 51 implants were inserted, of which 14 implant sites were bone augmented either prior to implant placement or in connection with the insertion procedure. Further, four remaining teeth were extracted in the region of interest during implant placement. One implant presented with infection and mobility at abutment connection and was consequently removed. Implant survival rate was 98.0%. Mean marginal bone level at crown placement was 0.41 mm (SD = 0.45 mm) and the corresponding measurements at 1 year for 22 implants revealed a marginal bone resorption of 0.41 mm (SD = 0.36 mm). Abutments with angulated screw channels were used in 42/49 sites. Conclusion The NobelParallel CC implant seemed to work well together with the ASC abutment. No major complications were noted.

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

“…Limited peri‐implant bone loss was found at the 1‐year evaluation, being somewhat less compared to the data from the aforementioned study by Friberg and Ahmadzai, being 0.16 vs 0.41 mm. Therefore, it could be hypothesized that this new implant design with the conical internal connection creates favorable conditions in the implant restoration interface that minimize posttreatment marginal bone loss.…”

“…No complications were noticed, such as fracture of the framework, loosening of the restoration, or occlusal wear. The performance of parallel‐walled implants with conical connection in combination with restorations with an angulated screw channel abutment was recently reported by Friberg and Ahmadzai as well . They reported an implant survival rate reaching 98% and a restoration survival of 100% after 1 year in function.…”

“…This could be of functional or aesthetic concern or could weaken the restoration; therefore, as an alternative to the traditional straight screw channel, the angulated screw channel has been developed . A recent prospective clinical study evaluating the retention of single restorations with angulated screw channel abutments has reported favorable results without major complications …”

“…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 Zirconia-based implant-supported single restorations are rated as highly successful with a cumulative 5-year survival rate of 97.1%. However, the most common complication reported is the fracture of the veneering material, especially in the posterior region.…”

A multicenter cohort study on the association of the one‐abutment one‐time concept with marginal bone loss around bone level implants

“…Although significant differences could not be shown, these data may reflect a difference in machined collar height between the subgroups (0.5 mm for NobelParallel CC and 0.8 mm for NobelReplace CC PMC). The results on the 0.5 mm smooth collar implants are in agreement with previous findings describing 0.41 mm MBL after 12 months of follow‐up (Friberg & Ahmadzai, 2019). Meloni et al., (2018) described mean MBL of 0.93 mm after 12 months of follow‐up using NobelReplace CC PMC implants, which is also in line with our observations.…”