Influence of Cantilever Length on Stress Distribution in Peri-Implant Bone With Full Dental Arch on Four Implants Concept

Abstract

Background and Objective. The full dental arch on four implants concept is a useful therapy in the treatment of 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-dimensional finite 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 implants were 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 scheme 4-2-2-4; 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 observed in 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 functional load on the cantilever. The lowest peri-implant stresses were recorded when the implants were positioned according 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%.

Vertical versus angled immediately loaded implants for assisting maxillary overdentures with locator attachments: A preliminary results of one‐year randomized clinical trial

“…This was consistent with the findings of other studies. 44,45,49 Additionally, the use of the tilted implants achieves good implant support with a favorable occlusal load distribution 44,53 which may enhance the chewing of hard food compared to the vertical group as patients usually prefer to eat using a distal occlusion because of their eating habits before teeth extraction. 54 With a wider inter-implant distance and enough access for oral hygiene procedures, the angled group showed a significantly higher ease of cleaning compared to the vertical group.…”