Wide Restorative Emergence Angle Increases Marginal Bone Loss and Impairs Integrity of the Junctional Epithelium of the Implant Supracrestal Complex: A Preclinical Study

To assess the influence of the emergence angle on marginal bone loss (MBL) and supracrestal soft tissue around dental implants. In six mongrel dogs, the mandibular premolars and molars were extracted. After 3 months of healing, four dental implants were placed in each hemimandible. The implants were...

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Bibliographic Details
Published in:	Journal of clinical periodontology
Main Authors:	Strauss, Franz J, Park, Jin-Young, Lee, Jung-Seok, Schiavon, Lucia, Smirani, Rawen, Hitz, Sonja, Chantler, Jennifer G M, Mattheos, Nikos, Jung, Ronald, Bosshardt, Dieter, Cha, Jae-Kook, Thoma, Daniel
Format:	Journal Article
Language:	English
Published:	United States 09-10-2024
Subjects:	restorative angle emergence profile histology CAD/CAM dental implant dental implant‐abutment design prosthodontics titanium abutments
Online Access:	Get full text
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Summary:	To assess the influence of the emergence angle on marginal bone loss (MBL) and supracrestal soft tissue around dental implants. In six mongrel dogs, the mandibular premolars and molars were extracted. After 3 months of healing, four dental implants were placed in each hemimandible. The implants were randomly allocated to receive one of four customized healing abutments, each with a different value of the restorative emergence angle: 20°, 40°, 60° or 80°. Intra-oral radiographs were taken after placing the healing abutments and at 6, 9, 16 and 24 weeks of follow-up. Then, micro-CT and undecalcified histology and synchrotron were performed. MBL over time was analysed with generalized estimating equations (GEEs) and adjusted for baseline soft-tissue thickness. From implant placement to 24 weeks, GEE modelling showed that the MBL at mesial and distal sites consistently increased over time, indicating MBL in all groups (p < 0.001). The model indicated that MBL varied significantly across the different restorative angles (angle effect, p < 0.001), with 80° showing the greatest bone loss. Micro-CT, histology and synchrotron confirmed the corresponding trends and showed that wide restorative angles (60° and 80°) impaired the integrity of the junctional epithelium of the supracrestal tissue. A wide restorative angle increases MBL and impairs the integrity of the junctional epithelium of the implant supracrestal complex.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0303-6979 1600-051X 1600-051X
DOI:	10.1111/jcpe.14070