Influence of different diameter reductions in the labial neck region on the stress distribution around custom‐made root‐analogue implants

Custom-made prosthetic replacement is a common method of limb reconstruction after surgery of bone tumors. A custom-made tumor knee prosthesis was retrieved after fracture of the tibial stem. The fracture of stem was considered to be associated with some misalignment between the axis of femur and that of the femoral stem, which might cause stress concentration within the tibial component and eventually lead to fracture. To verify this hypothesis, finite element analysis was carried out to study the effect of various tilting degree (6[Formula: see text] forward, 0[Formula: see text] and 6[Formula: see text] backward) of the stem in the sagittal plane on the stress distribution within the tibial component. The calculated maximum Von Mises stress in the tibial component was 225.8, 362.8 and 511.3[Formula: see text]MPa when the femoral component was tilted for 6[Formula: see text] forward, [Formula: see text] and [Formula: see text] backward, respectively. The results demonstrated that the misalignment of femoral components in the sagittal plane has marked effect on the stress distribution of the tibial component.

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Finite Element Analysis of a New Dental Implant Design Optimized for the Desirable Stress Distribution in the Surrounding Bone Region

Prosthesis ◽

10.3390/prosthesis2030019 ◽

2020 ◽

Vol 2 (3) ◽

pp. 225-236 ◽

Cited By ~ 1

Author(s):

Luigi Paracchini ◽

Christian Barbieri ◽

Mattia Redaelli ◽

Domenico Di Croce ◽

Corrado Vincenzi ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Cortical Bone ◽

Dental Implant ◽

Neck Region ◽

Implant Design ◽

Three Dimensional Model ◽

Element Analysis ◽

Surrounding Bone

Dental implant macro- and micro-shape should be designed to maximize the delivery of optimal favorable stresses in the surrounding bone region. The present study aimed to evaluate the stress distribution in cortical and cancellous bone surrounding two models of dental implants with the same diameter and length (4.0 × 11 mm) and different implant/neck design and thread patterns. Sample A was a standard cylindric implant with cylindric neck and V-shaped threads, and sample B was a new conical implant with reverse conical neck and with “nest shape” thread design, optimized for the favorable stress distribution in the peri-implant marginal bone region. Materials and methods: The three-dimensional model was composed of trabecular and cortical bone corresponding to the first premolar mandibular region. The response to static forces on the samples A and B were compared by finite element analysis (FEA) using an axial load of 100 N and an oblique load of 223.6 N (resulting from a vertical load of 100 N and a horizontal load of 200 N). Results: Both samples provided acceptable results under loadings, but the model B implant design showed lower strain values than the model A implant design, especially in cortical bone surrounding the neck region of the implant. Conclusions: Within the limitation of the present study, analyses suggest that the new dental implant design may minimize the transfer of stress to the peri-implant cortical bone.

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Effects of Custom-Made and Thread Dental Implant Systems on the Stress Distribution in Alveolar Bone: A 3-Dimensional Finite Element Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.475-476.1487 ◽

2013 ◽

Vol 475-476 ◽

pp. 1487-1493 ◽

Cited By ~ 1

Author(s):

Xiao Zhang ◽

Zhan Gong Xie ◽

Wei Feng ◽

Xian Shuai Chen ◽

Jian Yu Chen

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Dental Implant ◽

Alveolar Bone ◽

Element Analysis ◽

Custom Made ◽

Dimensional Finite Element ◽

Stress And Deformation ◽

Implant System

Aiming to investigate the effects of custom-made and thread dental implant systems on the stress distribution in alveolar bone using linear analysis of the finite element method (FEM). Two types of systems: the custom-made implant and the thread dental implant system, were studied using a three-dimensional finite element analysis (3D FEA). Comparing the parts of all systems for loading in different directions, the stress and deformation distribution in custom-made implant and alveolar bone are better than that in thread dental implant system. The analysis data definitely demonstrated the difference in stress and deformation distribution of components in different dental implant systems. Results show the custom-made implants are provided with more advantages and can be used in future experiment and clinical test.

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The concerted use of SEM, TEM, and SCM for examination of resin-dentin interfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100170116 ◽

1994 ◽

Vol 52 ◽

pp. 476-477

Author(s):

B. Van Meerbeek ◽

L. J. Conn ◽

E. S. Duke

Keyword(s):

Surface Layer ◽

Stress Distribution ◽

Phosphoric Acid ◽

Bonding Mechanism ◽

Restorative Dentistry ◽

Dental Adhesive ◽

Low Viscosity ◽

Dentin Adhesives ◽

Acid Etch ◽

Tooth Tissue

Restoration of decayed teeth with tooth-colored materials that can be bonded to tooth tissue has been a highly desirable property in restorative dentistry for many years. Advantages of such an adhesive restorative technique over conventional techniques using non-adhesive metal-based restoratives include improved restoration retention with minimal sacrifice of sound tooth tissue for retention purposes, superior adaptation and sealing of the restoration margins in prevention of caries recurrence, improved stress distribution across the tooth-restoration interface throughout the whole tooth, and even reinforcement of weakened tooth structures. The dental adhesive technology is rapidly changing. An efficient resin bond to enamel has already long been achieved. Its bonding mechanism has been fully elucidated and has proven to be a durable and reliable clinical treatment. However, bonding to dentin represents a greater challenge. After the failures of a dentin acid-etch technique in imitation of the enamel phosphoric-acid-etch technique and a bonding procedure based on chemical adhesion, modern dentin adhesives are currently believed to bond to dentin by a micromechanical hybridization process. This process is developed by an initial demineralization of the dentin surface layer with acid etchants exposing a collagen fibril arrangement with interfibrillar microporosities that subsequently become impregnated by low-viscosity monomers. Although the development of such a hybridization process has well been documented in the literature, questions remain with respect to parameters of-primary importance to adhesive efficacy.

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