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Related Concept Videos

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

468
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
468
Screw: Problem Solving01:21

Screw: Problem Solving

653
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
653
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

466
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
466

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Correlation Between Implant Geometry, Implant Surface, Insertion Torque, and Primary Stability: In Vitro

Antonello Falco, Marco Berardini, Paolo Trisi

    The International Journal of Oral & Maxillofacial Implants
    |July 20, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Dental implant macrogeometry and bone density significantly impact primary stability. Large-thread designs are recommended for poor bone quality, as insertion torque alone doesn

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    Area of Science:

    • Dental Implantology
    • Biomaterials Science
    • Bone Biology

    Background:

    • Primary implant stability is crucial for successful osseointegration.
    • Understanding the interplay between bone density, insertion torque, and implant design is vital for achieving optimal primary fixation.
    • This study investigates these relationships in vitro.

    Purpose of the Study:

    • To evaluate the impact of dental implant macrogeometry on primary stability.
    • To assess the influence of insertion torque values on primary stability.
    • To correlate these factors with different bone densities representative of the human mandible and maxilla.

    Main Methods:

    • 120 commercial dental implants with varying thread designs (small, microthreaded, large/reverse neck) were tested.
    • Implants were inserted into bovine ribs (D2-D3 bone density) and ovine iliac crest (D4 bone density).
    • Insertion torque and micromobility under lateral force were recorded.

    Main Results:

    • In medium-density bone, reverse neck designs showed less stability than conventional straight necks.
    • In soft bone, large-thread and microthreaded designs demonstrated superior stability compared to small-thread designs.
    • Large-thread implants exhibited significantly lower micromobility in post-extraction sites with low bone density.

    Conclusions:

    • Implant geometry and bone density are key determinants of primary stability.
    • Large-thread implant designs are advantageous in compromised bone quality.
    • While insertion torque correlates with stability for a specific implant/bone type, it's not a universal comparative metric for primary stability.