Micromotions and combined damages at the dental implant/bone interface

Abstract

Tiny movements at the contact area between dental implants and the underlying bone surface can cause wear and tear that threatens the long-term integrity of dental prostheses. This problem of so-called ‘fretting damage’ was long ignored by dentists and dental surgeons. Now, a review by Hai-Yang Yu and colleagues at Sichuan University in Chengdu, China, shows that the micrometer-scale movements at the dental implant–bone interface can actually be subdivided into two types: tangential fretting, which is caused by the direct contact stress of mastication, and radial fretting, which arises from the grinding-like pressure between the two surfaces when they remain in contact. The combination of these stresses leads to small cracks that are a big problem in the replacement of missing teeth by implant-supported prostheses.

Keywords

dental implant / fretting damage / micromotion

References

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