Design optimization of implant geometrical characteristics enhancing primary stability using FEA of stress distribution around dental prosthesis

The design of an implant thread plays a fundamental role in the osseointegration process, particularly in low-density bone. It has been postulated that design features that maximize the surface area available for contact may improve mechanical anchorage and stability in cancellous bone. The primary stability of a dental implant is determined by the mechanical engagement between the implant and bone at the time of implant insertion. The contact area of implant-bone interfaces and the concentrated stresses on the marginal bones are principal concerns of implant designers. Numerous factors influence load transfer at the bone-implant interface, for example, the type of loading, surface structure, amount of surrounding bone, material properties of the implant and implant design. The purpose of this study was to investigate the effects of the impact two different projectile of implant threads on stress distribution in the jawbone using three-dimensional finite element analysis.

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Influences of Prosthesis Stem Lengths in Cementless Total Hip Arthroplasty

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.52-54.2088 ◽

2011 ◽

Vol 52-54 ◽

pp. 2088-2093 ◽

Cited By ~ 6

Author(s):

Abdul Halim Abdullah ◽

Emmi Farisa Jaafar ◽

Nursalbiah Nasir ◽

Eli Nadia Abdul Latip ◽

Giha Tardan

Keyword(s):

Stress Distribution ◽

Hip Arthroplasty ◽

Maximum Stress ◽

Stress Shielding ◽

Primary Stability ◽

Middle Region ◽

Cementless Total Hip Arthroplasty ◽

Calculated Stress ◽

Long Stem ◽

Stability Issues

Stress shielding phenomenon is an important issues in considering the primary stability of the cementless hip arthroplasty. Stress shielding occurs when there is a mismatch in the elastic modulus of two materials perfectly bonded to each other, such as the prosthesis stem and the bone. In this study, influences of different prosthesis stem lengths on stress distribution in cementless THA are examined using finite element method. The calculated stress distribution is discussed with respect to stress shielding and primary stability issues in THA femur cases. Results show that similar pattern in stress distribution for intact and THA femur but differs in magnitudes. The stress level increases from the neck to the middle region and peaks at locations coinciding with the tip of the prosthesis. The maximum stress for intact femur is 55.5 MPa, THA with short stem is defined up to 112 MPa, while with medium and long stem are 204 MPa and 278 MPa, respectively.

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The Effect of the Projectile Shape on the Stress Biomechanical Behavior of Dental Implant: Three-dimensional Analysis

Periodica Polytechnica Mechanical Engineering ◽

10.3311/ppme.12580 ◽

2019 ◽

Vol 63 (4) ◽

pp. 249-256 ◽

Cited By ~ 1

Author(s):

Noureddine Djebbar ◽

Boualem Serier ◽

Smail Benbarek ◽

Benali Boutabout

Keyword(s):

Dental Implants ◽

Three Dimensional ◽

Primary Stability ◽

Dental Prosthesis ◽

Bone Implant ◽

Analysis And Design ◽

Biomechanical Behavior ◽

Physical Problems ◽

Implant Abutment ◽

Biomechanical Factors

The finite element method is used to solve mechanical and physical problems in engineering analysis and design. Primary stability has been regarded as a prerequisite for osseointegration of dental implants. Biomechanical factors play a key role in the success of dental implants. The study of impact velocity is relevant to the biomechanics of dental implants. The purpose of this analysis was to determine the intensity and distribution of stresses in the dental prosthesis elements (crown, framework, implant, abutment, bone) and the sliding at the bone–implant interface under the effect of a mechanical impact of different geometric shape of projectile, this shock simulates a stone throw or other objects coming into contact with the dental prosthesis.

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