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Residual Stresses in Circular Shafts01:10

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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...
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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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External Hexagon Deformation in Implants Subjected to Internal Torque.

Denildo Magalhães1, Marina Melo Naves1, Helder Henrique Machado Menezes2

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Dental implant external hexagon (EH) connections deform under internal torque. Higher torques cause greater dimensional changes, with one implant type showing more significant deformation than the other.

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Area of Science:

  • Biomaterials Science
  • Dental Implantology
  • Mechanical Engineering

Background:

  • Dental implant failures can occur at the connection point, particularly with external hexagon (EH) designs.
  • Deformation of the EH interface is a primary concern impacting implant stability and longevity.

Purpose of the Study:

  • To quantify the deformation of external hexagon (EH) connections in dental implants under varying internal torque levels.
  • To compare the deformation response between two different implant groups (N and S) when subjected to internal torque.

Main Methods:

  • Two types of dental implants (N group and S group) were subjected to controlled internal torques ranging from 0 to 80 Ncm.
  • Digital imaging and specialized software were used to measure changes in internal distance (ID), internal area (IA), and external area (EA) of the EH.
  • Statistical analysis was performed using the Scott-Knott test to determine significant differences.

Main Results:

  • Increased internal torque levels resulted in greater dimensional changes (ID, IA, EA) in the EH connections for both implant groups.
  • The S group exhibited greater deformation in EA and IA at lower torque thresholds (≥40 Ncm and ≥30 Ncm, respectively) compared to the N group (≥60 Ncm and ≥32 Ncm, respectively).
  • Overall, the S group demonstrated higher levels of deformation than the N group across tested torque ranges.

Conclusions:

  • Internal torque significantly impacts the dimensional stability of dental implant external hexagon (EH) connections.
  • The design or material differences between the N and S implant groups influence their susceptibility to deformation under torque.
  • Understanding these deformation characteristics is crucial for optimizing dental implant design and preventing connection failures.