Abstract
Background Tilted implants have been recommended as an alternative to the bone graft procedures in implant sites although with possibly higher stress concentrations. This study reviews finite element studies to evaluate patterns of stress and strain in complete-arch prostheses supported by 4‒6 implants. Methods A literature search was performed using the online databases. Articles published in English from 2003 to 2015 were reviewed. A total of 100 articles were found related to the subject and after evaluating the titles and abstracts, 18 studies were selected. Results By increasing the number of implants, a reduction was detected in the amount of stress in the bone and implants, while in others, the stress level did not change with the increase in the number of implants. Conclusion According to finite element analyses, placing a distal implant in an angular position results in better distribution of forces and stresses. Using less cantilever lengths would reduce the stress.
Highlights
Edentulism is a common condition in elderly patients due to bad oral hygiene, caries and periodontal diseases.[1]
By increasing the number of implants, a reduction was detected in the amount of stress in the bone and implants, while in others, the stress level did not change with the increase in the number of implants
This study aims at reviewing finite element analysis to assess patterns of stress and strain in completearch prostheses supported by 4‒6 implants
Summary
Edentulism is a common condition in elderly patients due to bad oral hygiene, caries and periodontal diseases.[1]. Limitations in the anatomy of the residual bone (such as mandibular canal and maxillary sinus) cause problems in dental implant placement.[7,8] There are various materials and techniques to overcome this problem.[9,10] Among these methods, advanced augmentation procedures to achieve adequate bone support for placing standard implants (length: 10‒12 mm and diameter: 3.5 mm) in an extremely atrophic posterior jaw should be mentioned.[11] all of these methods result in the risk of morbidity and complications in patients (such as infection and loss of the graft materials), costs and increased treatment time.[12]. This study reviews finite element studies to evaluate patterns of stress and strain in complete-arch prostheses supported by 4‒6 implants
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