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The impact of cantilevers on biological and technical success outcomes of implant‐supported fixed partial dentures. A retrospective cohort study
Author(s) -
Kim Paul,
Ivanovski Saso,
Latcham Neil,
Mattheos Nikos
Publication year - 2014
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.12102
Subject(s) - cantilever , implant , dentistry , medicine , retrospective cohort study , orthodontics , surgery , materials science , composite material
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 FDP s ( cFDP ) supported by 132 implants were compared with 99 individuals with 144 non‐cantilever FPD s (nc FDP s) 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 cFDP s were followed for average of 51 months (1551 days, SD ± 977), and nc FPD s for 49 months (1483 days, SD ± 809 days). Implant survival and success rates were 96.7% and 87.9% for implant supporting cFDP s, and 99.5% and 92.6% for nc FDP s. There was no significant difference in overall bone loss between cFDP s and nc FDP s (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 cFDP s and 0.24 SD ± 0.80 mm for nc FDP s). 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 FDP s. However, there are technical and biological implications which appear inter‐related.