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Journal of Dental Research
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Clinical

An Eight-year Follow-up to a Randomized Clinical Trial of Aftercare and Cost-analysis with Three Types of Mandibular Implant-retained Overdentures

G.T. Stoker1,2,3, D. Wismeijer2 and M.A.J. van Waas1

1 Free University, Department of Oral Function, Academic Centre for Dentistry Amsterdam, Dental School, Amsterdam, The Netherlands; and
2 Amphia Teaching Hospital, Department of Special Dental Care and Maxillofacial Prosthodontics, Breda, The Netherlands

Correspondence: 3 corresponding author, Hogeweg 5, NL-3212 LG Simonshaven, The Netherlands, geertstoker{at}wxs.nl

Mandibular implant overdentures increase satisfaction and the quality of life of edentulous individuals. Long-term aftercare and costs may depend on the type of overdentures. One hundred and ten individuals received one of 3 types of implant-retained overdentures, randomly assigned, and were evaluated with respect to aftercare and costs. The follow-up time was 8 years, with only seven drop-outs. No significant differences (Kruskal-Wallis test) were observed for direct costs of aftercare (p = 0.94). The initial costs constituted 75% of the total costs and were significantly higher in the group with a bar on 4 implants, compared with the group with a bar on 2 implants and the group with ball attachments on 2 implants (p = 0.018). The last group needed a significantly higher number of prosthodontist-patient aftercare contacts, mostly for re-adjustment of the retentive system. It can be concluded that an overdenture with a bar on 2 implants might be the most efficient in the long term.

Key Words: randomized controlled clinical trial • edentulism • cost-analysis • aftercare • implant-retained overdentures

Journal of Dental Research, Vol. 86, No. 3, 276-280 (2007)
DOI: 10.1177/154405910708600315
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