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Related Experiment Videos

The convergence angle in teeth prepared for artificial crowns.

E Ohm, J Silness

    Journal of Oral Rehabilitation
    |October 1, 1978
    PubMed
    Summary

    This study measured convergence angles for vital and root-filled teeth prepared for crowns. Root-filled teeth showed a wider range of angles than vital teeth, impacting crown preparation.

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    Area of Science:

    • Dentistry
    • Dental Materials
    • Prosthodontics

    Background:

    • Complete crowns require precise tooth preparation for optimal retention and longevity.
    • Convergence angles are critical geometric parameters influencing crown fit and stability.
    • Understanding these angles in vital versus root-filled teeth is essential for predictable restorative outcomes.

    Purpose of the Study:

    • To compare the bucco-lingual and mesio-distal convergence angles of vital and root-filled teeth prepared for complete crowns.
    • To provide quantitative data on convergence angles to inform dental practitioners.

    Main Methods:

    • Microscopic measurement of convergence angles on 190 stone dies representing prepared vital and root-filled teeth.
    • Analysis of both bucco-lingual and mesio-distal dimensions.

    Main Results:

    • Mean convergence angles for vital teeth ranged from approximately 19 to 27 degrees.
    • Mean convergence angles for root-filled teeth exhibited a broader range, varying between 12 and 37 degrees.
    • Significant variation in angles was observed in root-filled teeth compared to vital teeth.

    Conclusions:

    • Root-filled teeth demonstrate greater variability in convergence angles compared to vital teeth after preparation for complete crowns.
    • These findings highlight the importance of careful assessment of preparation geometry in root-filled teeth to ensure successful crown placement.
    • The data can aid dentists in achieving appropriate taper for optimal complete crown restorations.

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