ArticleCureus2026
Performance and Safety of Smooth-Collar (Tissue-Level) Implants: A Case Report and Clinical Literature Review.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The aim of the study is to describe a case series of full-arch rehabilitation of atrophic maxillae using smooth/machined collar (tissue-level) implants, including zygomatic and pterygoid implants, without bone grafting. Four consecutive patients with severe maxillary atrophy underwent clinical and radiographic evaluation, including cone-beam computed tomography, followed by implant placement using standardized surgical protocols. Immediate loading was performed when insertion torque exceeded 45-50 Ncm. Case 1 (65-year-old woman) was treated with four zygomatic, one pterygoid, and one conventional implant. Case 2 (58-year-old woman with controlled systemic conditions) underwent full-arch rehabilitation with conventional and pterygoid implants after tooth extraction. Case 3 (58-year-old woman) received a combination of conventional, zygomatic, and pterygoid implants; one implant was not used due to angulation. Case 4 (58-year-old woman) with an edentulous maxilla was treated with zygomatic, pterygoid, and conventional implants. All cases achieved 100% implant survival during follow-up periods ranging from 10 to 13 months. Prosthetic function remained stable in all patients, with no biological or mechanical complications reported. Smooth-collar (tissue-level) implants demonstrated predictable short-term outcomes in the rehabilitation of severely atrophic maxillae, including anatomically challenging regions such as zygomatic and pterygoid areas. Further studies with larger samples and longer follow-up are needed to confirm these findings. A systematic review was also conducted following the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines to evaluate the performance and safety of dental implants with a smooth/machined collar (tissue-level), with a particular focus on complex maxillary rehabilitations using zygomatic and pterygoid implants. Searches were performed in PubMed, SciELO, BVS, and Google Scholar for articles published between January 1, 2010, and January 28, 2025. Eligible studies included prospective and retrospective clinical trials, case series, and systematic reviews evaluating implants with a machined collar height > 3 mm in edentulous patients. Key outcomes assessed were implant survival rate, marginal bone loss, biofilm control, and incidence of complications.
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