The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis
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 l...
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MDPI AG
2021
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oai:doaj.org-article:3a54dae5dd614ea88ca1a6d1efcb5e532021-11-25T18:15:38ZThe Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis10.3390/ma142270061996-1944https://doaj.org/article/3a54dae5dd614ea88ca1a6d1efcb5e532021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7006https://doaj.org/toc/1996-1944Angulated 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 (<i>n</i> = 52) had a higher success rate (95%) when compared to partially veneered restorations (<i>n</i> = 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.Edoardo RellaPaolo De AngelisGiovanni DamisAntonio D’AddonaPaolo Francesco ManiconeMDPI AGarticleimplantologyscrew-retainedzirconiaTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7006, p 7006 (2021) |
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| collection |
DOAJ |
| language |
EN |
| topic |
implantology screw-retained zirconia Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
implantology screw-retained zirconia Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Edoardo Rella Paolo De Angelis Giovanni Damis Antonio D’Addona Paolo Francesco Manicone The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis |
| description |
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 (<i>n</i> = 52) had a higher success rate (95%) when compared to partially veneered restorations (<i>n</i> = 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. |
| format |
article |
| author |
Edoardo Rella Paolo De Angelis Giovanni Damis Antonio D’Addona Paolo Francesco Manicone |
| author_facet |
Edoardo Rella Paolo De Angelis Giovanni Damis Antonio D’Addona Paolo Francesco Manicone |
| author_sort |
Edoardo Rella |
| title |
The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis |
| title_short |
The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis |
| title_full |
The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis |
| title_fullStr |
The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis |
| title_full_unstemmed |
The Application of Angulated Screw-Channels in Metal-Free, Implant-Supported Restorations: A Retrospective Survival Analysis |
| title_sort |
application of angulated screw-channels in metal-free, implant-supported restorations: a retrospective survival analysis |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/3a54dae5dd614ea88ca1a6d1efcb5e53 |
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