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Related Concept Videos

Accuracy and Precision01:52

Accuracy and Precision

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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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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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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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Precision of In Vivo Quantitative Tooth Wear Measurement Using Intra-Oral Scans
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[Study on precision during articulator handling].

S Sawada

    Nihon Hotetsu Shika Gakkai Zasshi
    |October 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    This study evaluated articulator precision, finding that adjustments to the sagittal condyle path and sagittal incisal path can introduce errors. A

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    Area of Science:

    • Dental Technology
    • Biomechanical Engineering
    • Materials Science

    Background:

    • Articulators are crucial for dental restorations, simulating jaw movements.
    • Understanding articulator precision is vital for accurate prosthodontic treatment.
    • Variations in articulator components can affect the accuracy of dental models.

    Purpose of the Study:

    • To assess the three-dimensional displacement of an articulator's upper frame during adjustments.
    • To quantify displacement caused by static loading and cast mounting.
    • To develop a high-precision 'Remounting Method' for articulators.

    Main Methods:

    • Examined three-dimensional displacement of the upper frame with adjustments to the 'Inclination of sagittal condyle path' (I.S.C.P.) and 'Inclination of sagittal incisal path' (I.S.I.P.).
    • Measured displacement under static load applied to the upper frame.
    • Measured vertical displacement of the upper frame and cast after mounting with plaster, considering water-powder ratios.

    Main Results:

    • Significant displacement occurred between the upper and lower frames during articulator handling.
    • Optimal settings for mounting casts were identified as I.S.C.P. at 30 degrees and I.S.I.P. at 0 degrees.
    • Errors arose from three-dimensional displacement post-adjustment, and water-powder ratios influenced cast expansion.

    Conclusions:

    • Articulator rigidity and precision are critical factors in dental model accuracy.
    • The proposed 'Remounting Method' aims to enhance the precision of articulator use.
    • Careful consideration of articulator settings and material properties is necessary for reliable results.