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Related Concept Videos

Plastic Deformations01:14

Plastic Deformations

It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
Plastic Deformations01:19

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
Healing II: Complications01:24

Healing II: Complications

Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
Fractures: Bone Repair01:27

Fractures: Bone Repair

Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the procedure...

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Model to assess duration of distraction compared with degree of incisal crowding in symphyseal distraction osteogenesis.

The British journal of oral & maxillofacial surgery·2013
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Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants
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Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants

Published on: May 23, 2020

[Deformities and therapeutic attitudes].

Catherine Lesne, Valentin Lesne

    L' Orthodontie Francaise
    |September 20, 2007
    PubMed
    Summary
    This summary is machine-generated.

    Dental dysmorphias require clear classification by severity. Defining concepts like norm, anomaly, and dysmorphia is crucial for accurate diagnosis and treatment decisions in dental practice.

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    Area of Science:

    • Dentistry
    • Medical Science

    Context:

    • Dental dysmorphias represent a significant clinical challenge.
    • Evolving societal perceptions of normality, amplified by media, influence dental aesthetics.
    • Practitioners face pressure to treat uncertain cases.

    Purpose:

    • To emphasize the importance of classifying dental dysmorphias based on severity.
    • To clarify fundamental concepts: norm, anomaly, dysmorphia, and malformation.
    • To address the impact of societal norms on clinical judgment.

    Summary:

    • Dental dysmorphias are common and necessitate a severity-based classification system.
    • Precise definitions of norm, anomaly, dysmorphia, and malformation are essential.
    • Modern concepts of normality are increasingly narrow, affecting clinical practice.

    Impact:

    • Improved diagnostic accuracy for dental dysmorphias.
    • Standardized approach to classifying and managing dental anomalies.
    • Guidance for practitioners on treatment decisions amidst societal pressures.