160938 20251017144632.0 doi 10.1007/s00784-025-06364-8 sideral 144078 ART-2025-144078 eng Quintas-Hijós, Jacobo Universidad de Zaragoza Influence of intermediate abutment height and timing of placement on marginal bone loss in single implant-supported crowns: a 12-month follow-up randomized clinical trial 2025 Access copy available to the general public Unrestricted Objectives: To determine the most effective combination of abutment height and timing of placement in reducing marginal bone loss (MBL). Materials and methods: 54 patients received at least one single screw-retained crown on an implant replacing a posterior tooth (60 implants). Implants were divided into six groups based on intermediate abutment height (1.5 mm, 2 mm, 3 mm) and timing of placement (immediate: surgery 1; delayed: surgery 2): Group A3I (height 3, surgery 1), Group A2I (height 2, surgery 1), Group A15I (height 1.5, surgery 1), Group A3D (height 3, surgery 2), Group A2D (height 2, surgery 2), Group A15D (height 1.5, surgery 2). Mesial and distal linear radiographic measurements were taken at five follow-up points: implant surgery, crown placement (T1), and 3 (T2), 6 (T3), and 12 months after loading (T4). Partial and total MBL were compared between groups. Results: After 12 months, the lowest MBL was found in groups A3I (0.13 ± 0.11 mm) and A2I (0.24 ± 0.11 mm), with no statistical difference between them. Groups A15I (0.70 ± 0.12 mm), A3D (0.66 ± 0.11 mm), A2D (0.62 ± 0.12 mm), and A15D (0.78 ± 0.11 mm) showed significantly higher MBL than groups 1 and 2, with no statistical difference among them. Conclusions: Immediate abutments of 2–3 mm resulted in lower MBL compared to 1.5 mm immediate abutments or any delayed abutments. info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Pérez-Pevida, Esteban 1013 275 Universidad de Zaragoza Dpto. Cirugía Área Estomatología 29 (2025), 291 [13 pp.] Clinical Oral Investigations 1436-3771 1763471 http://zaguan.unizar.es/record/160938/files/texto_completo.pdf Versión publicada 2011606 http://zaguan.unizar.es/record/160938/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:160938 articulos driver 2025-10-17-14:26:47 ARTICLE