Vaidas Varinauskas, Saulius Diliūnas, Ričardas Kubilius, Albinas Gervickas


Background and Objective. The full dental arch on four implants concept is a useful therapy in the treatmentof an edentulous mandible. Few studies have shown the effect of the cantilever length on the peri-implant bone. The aim of the study was to clarify the influence of the cantilever length on the stress and their distribution in the peri-implant bone.Material and Methods. For research purposes, 3-dimensionalfinite element analysis models based on the highest atrophy of an edentulous mandible were constructed. Four dental implants were inserted in interforaminal segment in 4 conditions. The implantswere splinted with a 14-unit bridge. A load of 300 N was applied to the occlusal surface at the end of the cantilever. Results. The lowest peri-implant stresses around the distal implant were in the scheme4-2-2-4; they were by 1% greater in the scheme 4-1-1-4, by 16.7% greater in the scheme 4-3-3-4 and by 71% greater in the scheme 3-2-2-3. The greatest stresses of distal implants peri-implant bone and the lowest bone stresses of central implants were observedin the 3-2-2-3 scheme. A longed cantilever significantly increased the peri-implant overloading around a distal implants in all cases.Conclusions. The research showed that stresses were formed around all implants during a functionalload on the cantilever. The lowest peri-implant stresses were recorded when the implants were positionedaccording to the 4-2-2-4 and 4-1-1-4 scheme.A shortened cantilever significantly reduced the peri-implant overloading around a distal implant up to 358%.

Keyword(s): peri-implant bone, cantilever, FEM.
DOI: 10.5200/sm-hs.2014.020
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