Table 1. Causes of early and late dental implant failure.

Source: [7]

AIDS: acquired immunodeficiency syndrome

Causes of early failure	Causes of late failure
Poor bone quality and quantity, systemic diseases such as uncontrolled diabetes mellitus, AIDS, osteoporosis, medications such as corticosteroids and bisphosphonates, smoking, infection, lack of primary stability, surgical trauma	Excessive loading, peri-implantitis, bruxism, teeth grinding at night time, retained subgingival dental cement, inadequate prosthetic construction, traumatic occlusion