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Clin Oral Implants Res. 2014 Feb;25(2):175-84. doi: 10.1111/clr.12102. Epub 2013 Jan 2.

The impact of cantilevers on biological and technical success outcomes of implant-supported fixed partial dentures. A retrospective cohort study.

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1
School of Dentistry and Oral Health, Griffith University, Gold Coast, Australia.

Abstract

OBJECTIVE:

To investigate the biological and technical success outcomes of implant-supported fixed dental prostheses with and without cantilevers, after a minimum of one year loading.

MATERIAL AND METHODS:

One hundred and seven subjects with 128 cantilever FDPs (cFDP) supported by 132 implants were compared with 99 individuals with 144 non-cantilever FPDs (ncFDPs) supported by 203 implants. Outcomes such as marginal bone loss from FDP insertion to final follow-up as well as frequency and extent of biological and technical complications were investigated and correlated with patient, site, implant and FDP design characteristics.

RESULTS:

The cFDPs were followed for average of 51 months (1551 days, SD ± 977), and ncFPDs for 49 months (1483 days, SD ± 809 days). Implant survival and success rates were 96.7% and 87.9% for implant supporting cFDPs, and 99.5% and 92.6% for ncFDPs. There was no significant difference in overall bone loss between cFDPs and ncFDPs (cantilever side: 0.58, SD ± 1.16 - non-cantilever side: 0.59, SD ± 0.99), but implants in the cantilever group lost significantly more bone in the posterior mandible (0.50 SD ± 1.3 mm for cFDPs and 0.24 SD ± 0.80 mm for ncFDPs). Within the cantilever group, cantilever arm length and implant location had an influence on bone loss. Regardless of the presence of cantilever, implants associated with technical complications had a higher rate of biological complications as well. Furthermore, the length of the cantilever arm was positively correlated with implant failure, technical complications and bone loss ≥1.5 mm (P = 0.011, <0.001, and 0.007).

CONCLUSION:

Overall implants can be successfully used to support cantilever FDPs. However, there are technical and biological implications which appear inter-related.

KEYWORDS:

biological complications; cantilevers; dental implants; implant-supported fixed partial dentures; peri-implant bone loss; technical complications

PMID:
23281736
DOI:
10.1111/clr.12102
[Indexed for MEDLINE]

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