Liñares, AntonioMuñoz Guzón, Fernando MaríaPermuy Mendaña, MaríaDard, MichelBlanco Carrión, Juan2025-01-242025-01-2420151600-0501https://hdl.handle.net/10347/38986Objectives: To investigate soft tissue histomorphology and quality around implants with a modified transgingival collar surface comparatively to a machined. Material and methods: Twenty-seven Straumann Standard Tissue Level implants belonging to the following groups (nine of each group): Ti modSLA with machined collar (Ti-M), Ti modSLA with machined, acid-etched surface collar (Ti-modMA), and TiZr modSLA with machined, acid-etched surface collar (TiZr-modMA) were placed in the mandible of six minipigs. After 8 weeks of healing, buccal sections were obtained and processed for histological evaluation. Results: Histometric soft tissue outcomes were similar for the three types of implants. The percentage of connective tissue attached to implant surface and its length was longer at TiZr-modMA with respect to Ti-M implants. The number of inflammatory cells was slightly higher at the TiZr-modMA with respect to Ti-M implant. The percentage of area occupied by perpendicular collagen fibers was slightly higher for the modified surfaces in comparison with the machined. Conclusions: Modified implant collar surfaces at Ti and TiZr implants showed a soft tissue interface similar to machined. A tendency of increasing number of perpendicular collagen fibers and improved connective tissue contact was found at the modified implant surfaces.engBiological widthCollagen fibersMinipig modelModified implant surfacejournal article10.1111/CLR.124170905-7161restricted access