Implant Failure Risk Calculator

Bone density class has the largest swing in this calculator: moving from dense D1 cortical bone to sparse D4 trabecular bone alone changes the baseline failure rate by roughly five-fold, before any patient risk factors like smoking or diabetes are even applied. That reflects how strongly initial bone quality affects primary implant stability and the odds of successful osseointegration.

The calculator roughly doubles the baseline failure rate for a current smoker compared to a non-smoker with otherwise identical risk factors, consistent with smoking being one of the most consistently reported risk factors for implant failure in the literature -- smoking impairs wound healing and reduces vascularity around the graft and implant site.

Yes -- this calculator applies a larger risk multiplier for uncontrolled diabetes than for controlled diabetes, reflecting that poor glycemic control specifically (rather than a diabetes diagnosis alone) is what most consistently impairs wound healing and osseointegration. A patient with well-controlled blood sugar is modeled much closer to a non-diabetic baseline.

Location acts as a proxy for the bone quality and biomechanical loading typical of that site: posterior maxilla is modeled with the highest location-based risk because it commonly has the sparsest bone and highest chewing forces in the arch, while anterior mandible -- typically the densest bone -- is modeled with the lowest.

No -- in this calculator, the suggested loading protocol (immediate, early, or delayed) is driven only by bone density, smoking status, and diabetes control, not by bruxism. Bruxism does raise the overall failure risk estimate through the mechanical overload it adds, but it isn't factored into when the implant is recommended to be loaded here.