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Related Concept Videos

Virtual Work01:20

Virtual Work

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
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Uncertainty in Measurement: Accuracy and Precision03:37

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Accuracy and Precision01:52

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate...
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Principle of Virtual Work: Problem Solving01:13

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The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
To apply the principle of virtual work,...
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Data Reporting and Recording01:24

Data Reporting and Recording

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Reporting and recording are crucial in data documentation. The timely, thorough, and accurate documentation of facts is essential when recording patient data. Failure to record findings during an assessment or interpretation of a problem will result in loss of information and make the patient document unreliable. The reader is left with general impressions if the information is not specific. A recording is documenting data of the individual's health information in a traceable, secure, and...
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Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Related Experiment Video

Updated: Jan 27, 2026

Author Spotlight: Segmentation and VR for Advanced Neurovascular Interventions
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Precision of the virtual occlusal record.

Keyan P Botsford, Michael C Frazier, Ahmed A M Ghoneima

    The Angle Orthodontist
    |March 29, 2019
    PubMed
    Summary

    The Carestream CS3600 intraoral scanner accurately captures virtual occlusal record contact location and size. However, its precision in recording contact intensity requires further investigation for clinical applications.

    Keywords:
    Bite registrationIntraoral scannerPrecisionVirtual occlusal record

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    Area of Science:

    • Dental Technology
    • Digital Dentistry
    • Biomaterials Science

    Background:

    • Intraoral scanners are increasingly used for digital impressions.
    • Virtual occlusal records are crucial for accurate dental restorations.
    • Evaluating scanner precision is essential for clinical adoption.

    Purpose of the Study:

    • To assess the precision of the Carestream CS3600 Intraoral Scanner for virtual occlusal records.
    • To evaluate the accuracy of contact location, size, and intensity in bite registrations.
    • To determine the clinical applicability of the scanner's occlusal data.

    Main Methods:

    • Prospective study with 20 participants.
    • Acquired complete intraoral scans and two bite registrations.
    • Analyzed contact locations, size (circumference), and intensity on maxillary first molars and canines.
    • Used intraclass correlation coefficients and Kappa statistics for agreement assessment.

    Main Results:

    • No significant differences in contact location or size between registrations.
    • Statistically significant difference observed in mean contact intensity.
    • Weak correlation for contact size (ICC=0.35) and intensity (ICC=0.32).
    • Moderate agreement for contact location (κ=0.67).

    Conclusions:

    • The Carestream CS3600 demonstrates adequate precision for contact location and size in virtual occlusal records.
    • The scanner's precision in capturing contact intensity was insufficient.
    • Further research is needed to enhance the precision of virtual occlusal records with current software.