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Peri-implant tissue healing at implants with different designs and placement protocols: An experimental study in dogs

Journal article
Authors Monika Oskarsson
Motohiro Otsuki
Maria Welander
Ingemar Abrahamsson
Published in Clinical Oral Implants Research
Volume 29
Issue 8
Pages 873-80
ISSN 09057161
Publication year 2018
Published at Institute of Odontology, Section 2
Pages 873-80
Language en
Keywords Animals, Bone level, Dental implants, Histology, Platform switching, Radiographs, Subcrestal placement
Subject categories Periodontology


© 2018 John Wiley & Sons A/S. Objectives: To compare the peri-implant tissue response to subcrestal or crestal placement of implants with or without "platform-switched" implant/abutment connections. Material and methods: On each side of the mandible in six Labrador dogs, two "platform-switched" (PS) implants and two implants with matching implant/abutment diameters (PM) were placed in a crestal or a 1.5 mm subcrestal position. Sulcus formers/abutments were connected, baseline radiographs obtained and the distance between the abutment-fixture junction (A/F) and the marginal bone level (B) was determined. Five months later, radiographic and clinical examinations were repeated and biopsies were obtained and processed for histological analysis. Results: The radiographic analysis showed that marginal bone level changes occurred during the first observation period (13 weeks). PS-implants showed minor marginal bone level alterations during the full observation period (20 weeks), regardless of placement depth. For PM-implants, placement had a significant impact on bone level changes; crestal placement resulted in a mean bone loss of 0.4 mm and subcrestal placement in a 1.5 mm bone loss. The histometric measurements resulted in a distance A/F-B of 0.6 and 0.0 mm for PS implants, placed in a crestal or subcrestal position, respectively. The corresponding distance at PM-implants was 1.5 mm irrespective of placement protocol. The peri-implant mucosa was thicker at subcrestally placed implants as compared to a crestal placement. Conclusions: Bone remodeling occurred within the early healing phase. During the full 20 weeks of observation, PS-implants demonstrated significantly less crestal bone loss compared to PM-implants.

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