Journal of Periodontal and Implant Science

  • 제54권3호
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  • Pages.189-204
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  • 2024
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  • 2093-2278(pISSN)
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  • 2093-2286(eISSN)
대한치주과학회 (Korean Academy of Periodontology)
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Novel approach to assessing the primary stability of dental implants under functional cyclic loading in vitro: a biomechanical pilot study using synthetic bone

  • Jean-Pierre Fischer (ZESBO – Center for Research on Musculoskeletal Systems, Leipzig University) ;
  • Stefan Schleifenbaum (ZESBO – Center for Research on Musculoskeletal Systems, Leipzig University) ;
  • Felicitas Gelberg (Institute of Anatomy, Leipzig University) ;
  • Thomas Barth (DENTALE – Dental Competence Center Leipzig GmbH) ;
  • Toni Wendler (ZESBO – Center for Research on Musculoskeletal Systems, Leipzig University) ;
  • Sabine Loffler (Institute of Anatomy, Leipzig University)
  • 투고 : 2023.03.27
  • 심사 : 2023.07.31
  • 발행 : 2024.06.30
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초록

Purpose: This pilot study was conducted to develop a novel test setup for the in vitro assessment of the primary stability of dental implants. This was achieved by characterising their long-term behaviour based on the continuous recording of micromotions resulting from dynamic and cyclic loading. Methods: Twenty screw implants, each 11 mm in length and either 3.8 mm (for premolars) or 4.3 mm (for molars) in diameter, were inserted into the posterior region of 5 synthetic mandibular models. Physiological masticatory loads were simulated by superimposing cyclic buccal-lingual movement of the mandible with a vertically applied masticatory force. Using an optical 3-dimensional (3D) measuring system, the micromotions of the dental crowns relative to the alveolar bone resulting from alternating off-centre loads were concurrently determined over 10,000 test cycles. Results: The buccal-lingual deflections of the dental crowns significantly increased from cycle 10 to cycle 10,000 (P<0.05). The deflections increased sharply during the first 500 cycles before approaching a plateau. Premolars exhibited greater maximum deflections than molars. The bone regions located mesially and distally adjacent to the loaded implants demonstrated deflections that occurred synchronously and in the same direction as the applied loads. The overall spatial movement of the implants over time followed an hourglass-shaped loosening pattern with a characteristic pivot point 5.5±1.1 mm from the apical end. Conclusions: In synthetic mandibular models, the cyclic reciprocal loading of dental implants with an average masticatory force produces significant loosening. The evasive movements observed in the alveolar bone suggest that its anatomy and yielding could significantly influence the force distribution and, consequently, the mechanical behaviour of dental implants. The 3D visualisation of the overall implant movement under functional cyclic loading complements known methods and can contribute to the development of implant designs and surgical techniques by providing a more profound understanding of dynamic bone-implant interactions.

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과제정보

The authors would like to thank the Oral Reconstruction Foundation for providing the dental implants examined in this study.

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