Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Introduction: The proper angle of microimplant insertion is important for cortical anchorage, patient safety, and biomechanical control. However, the actual impact of different insertion angulations on stability is unknown.
Methods: To perform 3-dimensional finite element analysis, finite element models of a maxilla and a mandible with types D3 and D2 bone quality, and of microimplants with a diameter of 1.3 mm and lengths of 8 and 7 mm were generated. The microimplants were inserted at 30°, 45°, 60°, and 90° to the bone surface. A simulated horizontal orthodontic force of 200 g was applied to the center of the microimplant head, and stress distribution and its magnitude were analyzed with a 3-dimensional finite element analysis program.
Results: The maximum von Mises stresses in the microimplant and the cortical bone decreased as the insertion angle increased. Analysis of the stress distribution in the cortical and cancellous bones showed that the stress was absorbed mostly in the cortical bone, and little was transmitted to the cancellous bone. The maximum von Mises stress was higher in type D3 bone quality than type D2 bone quality.
Conclusions: Placement of microimplants at a 90° angulation in the bone reduces the stress concentration, thereby increasing the likelihood of implant stabilization. Perpendicular insertion offers more stability to orthodontic loading.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ajodo.2011.06.031 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Molecular Plasmonic Cavities.
Nano Lett
September 2025
Department of Physics, Columbia University, New York, New York 10027, United States.
Graphene-based photonic structures have emerged as fertile ground for the controlled manipulation of surface plasmon polaritons (SPPs), providing a two-dimensional platform with low optoelectronic losses. In principle, nanostructuring graphene can enable further confinement of nanolight─enhancing light-matter interactions in the form of SPP cavity modes. In this study, we engineer nanoscale plasmonic cavities composed of self-assembled C arrays on graphene.
View Article and Find Full Text PDFA computational approach to simulating a three-sphere swimmer in a viscoelastic fluid modelled via the Giesekus constitutive law.
Philos Trans A Math Phys Eng Sci
September 2025
Department of Mathematical Sciences, University of Liverpool, Liverpool, UK.
Microswimmer locomotion in non-Newtonian fluids is crucial for biological processes, including infection, fertilization and biofilm formation. The behaviour of microswimmers in these media is an area with many conflicting results, with swimmers displaying varying responses depending on their morphology, actuation and the complex properties of the surrounding fluid. Using a hybrid computational approach, we numerically investigate the effect of shear-thinning rheology and viscoelasticity on a simple conceptual microswimmer consisting of three linked spheres.
View Article and Find Full Text PDFA practical approach to determining screw preload in dental implant systems.
J Prosthet Dent
September 2025
Professor, Washington Dental Service Endowed Chair in Dentistry, and Chair, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash.
A practical and novel technique used both in testing and in practice when tightening dental implant screw systems is described for determining the preload implant screw systems, which differs from traditional tightening procedures that are based solely on the application of a predetermined manufacturer specified torque value. Preload is the critical quantity for a reliable joint: about 90% of tightening torque goes into overcoming friction and the remaining amount, approximately 10%, goes into preload. Because of the heavy dependence of torque on friction, the actual preload achieved is subject to large variability of up ±35%, depending on surface conditions (dry, wet, or contaminated).
View Article and Find Full Text PDFBiomechanical impact of sagittal curvature radius in glenoid fossa on TMJ prosthesis performance: A finite element study of custom designs.
J Prosthet Dent
September 2025
Full Professor, School of Mechanical Engineering, Universidad Industrial de Santander, Bucaramanga, Colombia. Electronic address:
Statement Of Problem: Although custom temporomandibular joint (TMJ) prostheses manufactured via computer-aided design and manufacturing (CAD-CAM) and produced through 3-dimensional (3D) printing or computer numerical control (CNC) allow for sagittal curvature adjustments in the glenoid fossa, their design remains unregulated by the Food and Drug Administration. Consequently, the geometry is determined largely by the engineer's discretion, with limited biomechanical evidence to guide these decisions. The lack of validation regarding how sagittal curvature influences joint stress distribution under various anatomical and functional conditions represents a gap in current knowledge that warrants investigation.
View Article and Find Full Text PDFFinite Element Analysis of Mandibular Distraction Osteogenesis With a New Partially Bioabsorbable Distractor.
J Craniofac Surg
September 2025
Department of Craniomaxillofacial Surgery, Peking Union Medical College, Chinese Academy of Medical Sciences, Plastic Surgery Hospital, Beijing, China.
Objective: We designed a new distractor pairing a bioabsorbable upper fixing plate fixed by bioabsorbable screws with a traditional titanium distractor to simplify the second surgery removing the distractor after mandibular distraction osteogenesis. The present study aims to evaluate its biomechanical properties using finite element method.
Materials And Methods: Ten computer-aided designed models simulating mandibles of 5 patients under 2 working conditions, the instance of distraction and mastication, were produced.