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Figure 2a: Cast framework
Figure 2b: Framework incorporated into overdenture
Providing implant-retained
overdentures can be one of the
most professionally rewarding
aspects of your practice.
Figure 3: Virtual framework design with strut over attachment housing
If vertical space is lacking, a cast framework can be incorporated
into the new denture to provide strength (Figs. 2a, 2b).
Frameworks are designed to have a strut over the top of the
attachment housing (Fig. 3).
In mandibular overdenture cases, it is customary to place
four mini implants within the symphysis area with as wide
an anterior-posterior spread as possible while still ensuring
an adequate margin of safety from the nerve (Fig. 4a).
In maxillary overdenture cases, it is customary to place six
mini implants anterior to the sinuses (Fig. 4b). The O-ring
housings are 4.75 mm in diameter, and there should be at
least 2 mm of acrylic between these metal housings in the
denture base (Fig. 5). Therefore, the centers of the implants
should be at least 7 mm apart.
Providing implant-retained overdentures can be one of
the most professionally rewarding aspects of your practice
— and it can be life-changing for your patients. Planning
from both the prosthetic perspective and the surgical
perspective will help the cases go smoothly and minimize
future complications. IM
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