Marginal bone changes around platform-switched conical connection implants placed 1 or 2 mm subcrestally: A multicenter crossover randomized controlled trial.

Autor: Stacchi C; Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy., Lamazza L; Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, Rome, Italy., Rapani A; Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy., Troiano G; Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy., Messina M; Private Practice, Trieste, Italy., Antonelli A; Department of Health Sciences, Magna Graecia University, Catanzaro, Italy., Giudice A; Department of Health Sciences, Magna Graecia University, Catanzaro, Italy., Lombardi T; Department of Health Sciences, Magna Graecia University, Catanzaro, Italy.
Jazyk: angličtina
Zdroj: Clinical implant dentistry and related research [Clin Implant Dent Relat Res] 2023 Apr; Vol. 25 (2), pp. 398-408. Date of Electronic Publication: 2023 Feb 01.
DOI: 10.1111/cid.13186
Abstrakt: Introduction: This study analyzes early marginal bone modifications occurring around platform-switched implants with conical connection placed 1 or 2 mm subcrestally.
Methods: This crossover randomized controlled trial enrolled partially edentulous patients needing two implants in either the posterior maxilla or mandible. Each patient received two platform-switched implants with conical connection inserted 2 mm (Test) and 1 mm (Control) subcrestally. Definitive abutments were immediately connected and, after 4 months of unsubmerged healing, screwed metal-ceramic crowns were delivered. Radiographs were taken at implant placement (T0), prosthesis delivery (T1), and after 1 year of prosthetic loading (T2).
Results: Fifty-one patients (25 males and 26 females; mean age 61.2 ± 12.1 years) totaling 102 implants were included in the final analysis. Mean peri-implant bone level (PBL) reduction from T0 to T2 was not significantly different around Test (0.49 ± 0.32 mm) and Control implants (0.46 ± 0.35 mm; p = 0.66). Multivariate linear regression models highlighted a significant positive correlation between history of periodontitis and PBL reduction. At T2, no Test group implant and 6 Control group implants exhibited PBL below the implant platform (11.8% of Control group implants).
Conclusion: No significant differences in peri-implant marginal bone changes were demonstrated after 1 year of prosthetic loading between platform-switched implants with conical connection inserted either 1 or 2 mm subcrestally. However, 2 mm subcrestal placement resulted in deeper implant positioning at T2, with no exposure of treated implant surface and potential preventive effect against subsequent peri-implant pathology.
(© 2023 The Authors. Clinical Implant Dentistry and Related Research published by Wiley Periodicals LLC.)
Databáze: MEDLINE
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