Abstract
The loss of retention and stability are considered the most common prosthetic problems that face prosthodontics in complete denture patients especially with continued residual ridge resorption, which increased the number of patients’ seeking improvement of the retention and stability in order to use their dentures. The implant supported overdenture is considered the best option of treatment to solve these problems. Implants may be subjected to occlusal overloading during function which will negatively affect the prognosis of implant osseintegration. This encouraged us to review the literature concerning the factors affecting implant assisted overdentures (IAOD) overloading and how to control them to the benefit and comfort of the patient as well as longevity of the prosthetic.
Highlights
The loss of retention and stability are considered the most common prosthetic problems that face prosthodontics in complete denture patients especially with continued residual ridge resorption, which increased the number of patients’ seeking improvement of the retention and stability in order to use their dentures
Many prosthetic factors and clinical related scenarios that should be considered during the construction and planning of implant assisted overdentures (IAOD), which may be responsible for implants overloading such as: Implant overdenture attachment system selected
Poor fitting of prosthesis on implants or loss of passivity is responsible for transfering unwelcome stresses to the bone/implant interface, which could induce a loss of osseointegration
Summary
Many prosthetic factors and clinical related scenarios that should be considered during the construction and planning of IAOD, which may be responsible for implants overloading such as: Implant overdenture attachment system selected. While bar unit attachments which do not allow any movement of the overdenture during function and used with limited interocclusal space scenarios transfer all the load onto the implants. MP-2021-395 mandibular resorption with the vertical movement of the denture in case of two implants assisted mandibular overdentures due to allowing load sharing by the posterior ridge area. 9 The stud resilient attachments permit some tissue ward vertical and rotational movements, protecting the underlying abutments or implants against overload[9]. Himmolova et al, reported that the use of long distal cantilever bar extension for mucosal implant supported overdenture caused favourable load distribution to the alveolar ridge but on the expense of implant supported structures. A gradient type of occlusal contact force along the length of cantilever may be beneficial. 13-17
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