A mini dental implant is exactly what it sounds like; they are dental implants that are a little bit smaller than regular dental implants. They are also called small diameter implants, or SDIs. They work on the same principle as regular dental implants but are much smaller, and as such tax the jawbones a lot less. They are tailored towards people who cannot have regular dental implants due to some form of bone density issue, but who do not necessarily warrant a bone graft.