Upper implant overdentures are less widely used because usually, a greater number of implants are needed to stabilize the denture. Sometimes an upper overdenture might need as many as six dental implants compared with just two or four dental implants for a lower denture.
This is because the upper jawbone is quite different in its volume and density, and important structures like the sinus cavities must also be avoided during implant placement, making this treatment more complex. Usually, lower dentures are more problematic compared with upper dentures because they provide significantly less retention.
While an upper implant overdenture might not be a suitable solution, there are almost certainly other options available, which we can discuss with you.