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Influence of sagittal root positions on the stress distribution around custom-made root-analogue implants: a three-dimensional finite element analysis. | LitMetric

Influence of sagittal root positions on the stress distribution around custom-made root-analogue implants: a three-dimensional finite element analysis.

BMC Oral Health

Second Dental Center, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100101, China.

Published: September 2021

AI Article Synopsis

  • Stress concentration in bone can lead to issues like bone resorption and failed implantation, which is investigated through three-dimensional finite element analysis.
  • Different types of custom-made root-analogue implants were tested in various sagittal root positions to compare stress distributions using specific software.
  • Results showed that the sagittal root position affects stress concentration, with Class I positions experiencing the highest stress peaks, but overall stress levels were lower for these implants compared to traditional implants, especially in threaded designs.

Article Abstract

Background: Stress concentration may cause bone resorption even lead to the failure of implantation. This study was designed to investigate whether a certain sagittal root position could cause stress concentration around maxillary anterior custom-made root-analogue implants via three-dimensional finite element analysis.

Methods: The von Mises stresses in the bone around implants in different groups were compared by finite element analysis. Six models were constructed and divided into two groups through Geomagic Studio 2012 software. The smooth group included models of unthreaded custom-made implants in Class I, II or III sagittal root positions. The threaded group included models of reverse buttress-threaded implants in the three positions. The von Mises stress distributions and the range of the stresses under vertical and oblique loads of 100 N were analyzed through ANSYS 16.0 software.

Results: Stress concentrations around the labial lamella area were more prominent in the Class I position than in the Class II and Class III positions under oblique loading. Under vertical loading, the most obvious stress concentration areas were the labial lamella and palatal apical areas in the Class I and Class III positions, respectively. Stress was relatively distributed in the labial and palatal lamellae in the Class II position. The maximum von Mises stresses in the bone around the custom-made root-analogue implants in this study were lower than around traditional implants reported in the literature. The maximum von Mises stresses in this study were all less than 25 MPa in cortical bone and less than 6 MPa in cancellous bone. Additionally, compared to the smooth group, the threaded group showed lower von Mises stress concentration in the bone around the implants.

Conclusions: The sagittal root position affected the von Mises stress distribution around custom-made root-analogue implants. There was no certain sagittal root position that could cause excessive stress concentration around the custom-made root-analogue implants. Among the three sagittal root positions, the Class II position would be the most appropriate site for custom-made root-analogue implants.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8438997PMC
http://dx.doi.org/10.1186/s12903-021-01809-4DOI Listing

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