Angulated screw channels (ASC) allow the clinician to reposition the access hole of screw-retained restorations, improving the design of the rehabilitation and the esthetic outcome. Few clinical studies are available on the efficacy of these restorations, especially at longer follow-ups and with a large number of subjects. The objective of this study was therefore to retrospectively evaluate patients rehabilitated with screw-retained restorations using ASC. The time of delivery and their adherence to the maintenance program was obtained, as well as the characteristics of the restoration and of the patient’s occlusion; a Kaplan–Meier survival curve was then built to investigate the success rate of these restorations and the effects of several variables were evaluated with a Cox model. A total of 105 subjects and 162 implants were enrolled in this study; after 42 months a success rate (92%) similar to what is reported for conventional screw-retained restorations was encountered. Monolithic zirconia restorations (n = 52) had a higher success rate (95%) when compared to partially veneered restorations (n = 53), which suffered a higher number of complications (90%). The other variables had no statistically significant effect. Implant supported prostheses adopting ASC provide a favorable outcome both in the posterior and anterior regions and can therefore be adopted to treat cases where the implant angulation is unfavorable for a conventional screw-retained prosthesis.

Rella, E., De Angelis, P., Damis, G., D'Addona, A., Manicone, P. F., The application of angulated screw-channels in metal-free, implant-supported restorations: A retrospective survival analysis, <<MATERIALS>>, 2021; 14 (22): 7006-7016. [doi:10.3390/ma14227006] [http://hdl.handle.net/10807/190146]

The application of angulated screw-channels in metal-free, implant-supported restorations: A retrospective survival analysis

De Angelis, Paolo;Damis, Giovanni;D'Addona, Antonio;Manicone, Paolo Francesco
2021

Abstract

Angulated screw channels (ASC) allow the clinician to reposition the access hole of screw-retained restorations, improving the design of the rehabilitation and the esthetic outcome. Few clinical studies are available on the efficacy of these restorations, especially at longer follow-ups and with a large number of subjects. The objective of this study was therefore to retrospectively evaluate patients rehabilitated with screw-retained restorations using ASC. The time of delivery and their adherence to the maintenance program was obtained, as well as the characteristics of the restoration and of the patient’s occlusion; a Kaplan–Meier survival curve was then built to investigate the success rate of these restorations and the effects of several variables were evaluated with a Cox model. A total of 105 subjects and 162 implants were enrolled in this study; after 42 months a success rate (92%) similar to what is reported for conventional screw-retained restorations was encountered. Monolithic zirconia restorations (n = 52) had a higher success rate (95%) when compared to partially veneered restorations (n = 53), which suffered a higher number of complications (90%). The other variables had no statistically significant effect. Implant supported prostheses adopting ASC provide a favorable outcome both in the posterior and anterior regions and can therefore be adopted to treat cases where the implant angulation is unfavorable for a conventional screw-retained prosthesis.
2021
Inglese
Rella, E., De Angelis, P., Damis, G., D'Addona, A., Manicone, P. F., The application of angulated screw-channels in metal-free, implant-supported restorations: A retrospective survival analysis, <<MATERIALS>>, 2021; 14 (22): 7006-7016. [doi:10.3390/ma14227006] [http://hdl.handle.net/10807/190146]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10807/190146
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