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Retention force measurement of telescopic crowns

Bayer, Stefan ; Stark, Helmut ; Mues, Sebastian ; Keilig, Ludger ; Schrader, Anja ; Enkling, Norbert

In: Clinical Oral Investigations, 2010, vol. 14, no. 5, p. 607-611

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    Titre
    • Retention force measurement of telescopic crowns
    Auteur
    • Bayer, Stefan. Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr.17, 53111, Bonn, Germany
    • Stark, Helmut. Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr.17, 53111, Bonn, Germany
    • Mues, Sebastian. Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr.17, 53111, Bonn, Germany
    • Keilig, Ludger. Oral Technology, University of Bonn, Bonn, Germany
    • Schrader, Anja. Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr.17, 53111, Bonn, Germany
    • Enkling, Norbert. Department of Prosthodontics, Preclinical Education and Dental Materials Science, University of Bonn, Welschnonnenstr.17, 53111, Bonn, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Clinical Oral Investigations, 2010, vol. 14, no. 5, p. 607-611. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:310492
    Summary
    This study deals with the determination of the retentive force between primary and secondary telescopic crowns under clinical conditions. Forty-three combined fixed-removable prostheses with a total of 140 double crowns were used for retention force measurement of the telescopic crowns prior to cementation. The crowns had a preparation of 1-2°. A specifically designed measuring device was used. The retentive forces were measured with and without lubrication by a saliva substitute. The measured values were analyzed according to the type of tooth (incisors, canines, premolars, and molars). Additionally, a comparison between lubricated and unlubricated telescopic crowns was done. As maximum retention force value 29.98N was recorded with a telescopic crown on a molar, while the minimum of 0.08N was found with a specimen on a canine. The median value of retention force of all telescopic crowns reached 1.93N with an interquartile distance of 4.35N. No statistically significant difference between lubricated and unlubricated specimens was found. The results indicate that retention force values of telescopic crowns, measured in clinical practice, are often much lower than those cited in the literature. The measurements also show a wide range. Whether this proves to be a problem for the patient's quality of life or not can however only be established by a comparison of the presented results with a follow-up study involving measurement of intraoral retention and determination by e.g. oral health impact profile