Fulltext

Clinical retention force development of double crowns

Bayer, Stefan ; Stark, Helmut ; Gölz, Lina ; Keilig, Ludger ; Kraus, Dominik ; Hansen, Anja ; Enkling, Norbert

In: Clinical Oral Investigations, 2012, vol. 16, no. 2, p. 407-411

Add to personal list
    Title
    • Clinical retention force development of double crowns
    Author
    • Bayer, Stefan. Department of Prosthodontics, Preclinical Education and Dental Materials Science, Welschnonnenstr.17, 53111, Bonn, Germany
    • Stark, Helmut. Department of Prosthodontics, Preclinical Education and Dental Materials Science, Welschnonnenstr.17, 53111, Bonn, Germany
    • Gölz, Lina. Clinic for Orthodontics, University of Bonn, Bonn, Germany
    • Keilig, Ludger. Endowed Chair of Oral Technology, Rheinische Friedrich-Wilhelms University, Bonn, Germany
    • Kraus, Dominik. Department of Prosthodontics, Preclinical Education and Dental Materials Science, Welschnonnenstr.17, 53111, Bonn, Germany
    • Hansen, Anja. Department of Prosthodontics, Preclinical Education and Dental Materials Science, Welschnonnenstr.17, 53111, Bonn, Germany
    • Enkling, Norbert. Department of Prosthodontics, Preclinical Education and Dental Materials Science, Welschnonnenstr.17, 53111, Bonn, Germany
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:318545
    Summary
    This study deals with the development of the retentive forces of double crowns intraorally measured. Twenty-five combined fixed-removable prostheses with a total of 84 double crowns were included in the study. The intraoral measurement was performed at 72 defined measuring points directly adjacent to the double crowns of the dentures. The measurement was performed 4-6weeks (baseline), 6months (recall 1), and 18months (recall 2) after the insertion of the restoration. A specifically designed measuring device was used. The median values for the single measuring points reached 4.705N at the baseline, 5.190N after 6months, and 3.740N after 18months. The measured values were analyzed according to differences between the median retention forces at the three defined points in time. The statistical analysis of the median values showed no statistical difference for the retention force change after 6months but for the decrease until the second recall (Mann-Whitney test). The retention force per denture was calculated by a summation of the single measuring points. At the baseline, 12.9N was reached. The forces did only decrease slightly and were not statistically significant. The results indicate that retention force values of double crowns, measured intraorally at the patient, do not relevantly change clinically within the first 1.5years. Within the limitations of this study, it can be stated that wear does not influence the retentive forces of double crowns within the first 18months. After this period the retention force should be still sufficient for denture retention