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oai:docta.ucm.es:20.500.14352/720982024-09-09T13:26:26Zcom_20.500.14352_14col_20.500.14352_15

Microleakage assessment of CAD-CAM Cobalt-Chrome and Zirconia abutments on a conical connection dental implant: A comparative in vitro study Molinero Mourelle, Pedro Roccuzzo, Andrea Yilmaz, Burak Lam, Walter Yu Hang Pow, Edmond Ho Nang Gómez Polo, Miguel Ángel Río Highsmith, Jaime Del Objective: To assess the marginal and bacterial microleakage in zirconia and CADCAM or cast Co-Cr implant abutments. Methods: Sixty-four conical connection implants with their respective abutments were divided into four groups (Co-Cr (milled, laser-sintered, and cast) and Zirconia (milled)). All specimens were subjected to a chewing simulation and thermocycling. After aging process, specimens were submerged in a 0.2% methylene blue solution with Porphyromonas gingivalis (P.g) for 48 h. The marginal microleakage was measured using a 40× optical microscopy at the internal part of the implant, and when positive microleakage was observed, a DNA isolation with a polymerase chain reaction (PCR) test was used. The microbiological assessment was based on colony forming units (CFUs). Results: Thirty (47%) implant-abutments presented microleakage and the PCR was performed on those specimens (1 Zirconia, 1 Co-Cr milled, 14 Co-Cr laser-sintered and 14 cast). Seven specimens (1 Co-Cr laser-sintered and six cast) presented values below the PCR detection limit t (<100 CFUs). The lowest CFUs count occurred in the Co-Cr milled group (5.17E+02 CFUs/ml) followed by zirconia (7.70E+03 CFUs/ml). The Co-Cr cast (9.39E+03 CFUs/ml) and laser-sintered (2.4E+05 CFUs/ml) groups had higher bacterial count. The CFU count comparison performed between Co-Cr cast and laser-sintered resulted in a statistically significant differences in favor of Co-CrCL (p<.05). Conclusions: The abutment material and fabrication technique affected the implantabutment microleakage. Although the CAD-CAM abutments presented favorable results, all tested groups presented microleakage. 2023-06-22T11:05:44Z 2023-06-22T11:05:44Z 2022-07-12 journal article Molinero Mourelle, P., Roccuzzo, A., Yilmaz, B. et al. «Microleakage Assessment of CAD‐CAM Cobalt‐Chrome and Zirconia Abutments on a Conical Connection Dental Implant: A Comparative in Vitro Study». Clinical Oral Implants Research, vol. 33, n.o 9, septiembre de 2022, pp. 945-52. DOI.org (Crossref), https://doi.org/10.1111/clr.13973. 0905-7161 10.1111/clr.13973 https://hdl.handle.net/20.500.14352/72098 https://doi.org/10.1111/clr.13973 eng https://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Wiley