Dental implant failure occurs for specific, identifiable reasons. At Granite Bay Oral Surgery, 40% of our practice is devoted to revision of failed implant work, so we see these causes daily. Understanding them helps both prevention and treatment.
1. Peri-Implantitis & Infection
The leading cause of late failure. Peri-implantitis affects 10–20% of implant patients. Bacterial buildup triggers chronic inflammation and progressive bone resorption. Risk is higher with acrylic prostheses (vs zirconia), smoking, poor hygiene, and infrequent maintenance.
2. Failed Osseointegration
When the implant does not properly fuse with jawbone. Causes include poor bone density, uncontrolled diabetes, smoking, medications like bisphosphonates, or excessive loading before integration is complete.
3. Poor Surgical Planning & Placement
Implants placed at incorrect angles, wrong depths, or in insufficient bone. Often results from inadequate CBCT imaging, lack of guided surgery, or providers attempting procedures beyond their training. This is the most common cause of failed All-on-4 cases we see.
4. Prosthetic Design Failures
Poorly designed bridges distribute forces unevenly, causing micro-fractures, screw loosening, and accelerated wear. Cheap acrylic materials that degrade rapidly are frequent culprits. Patients can upgrade to zirconia for superior longevity.
5. Insufficient Bone Foundation
Skipped sinus lifts, inadequate bone grafting, or grafts that did not integrate leave implants in compromised bone. Zygomatic implants bypass this problem entirely for upper jaw cases.
6. Systemic & Lifestyle Factors
Uncontrolled diabetes, smoking, osteoporosis, and bruxism (teeth grinding) all increase failure risk. Studies show bruxers experience 41% implant failure versus 12% for non-bruxers.
Recognize any warning signs? Contact us immediately for evaluation.