Biomechanics of Dental Implants: A Comprehensive Review of Biological and Mechanical Factors Influencing Long-Term Implant Success

Abstract

Biomechanics plays a fundamental role in the success or failure of dental implants. Unlike natural teeth, dental implants lack a periodontal ligament and transfer occlusal forces directly to the surrounding bone. Therefore, an in-depth understanding of mechanical load distribution, implant design, bone quality, and prosthetic considerations is crucial for predictable outcomes. This review explores the essential principles of implant biomechanics, including osseointegration, stress and strain distribution, implant macro- and micro-design, occlusal forces, angulation, crown-implant ratio, and prosthetic planning. The influence of bone density, immediate versus delayed loading, and parafunctional habits such as bruxism is discussed. Furthermore, modern concepts such as CAD/CAM, finite element analysis, short and tilted implants, and zygomatic and pterygoid anchorage are highlighted. Clinical guidelines and preventive strategies for biomechanical complications are provided. A clear understanding of biomechanics enables clinicians to optimize implant planning, enhance load distribution, minimize bone loss, and improve long-term stability. Future directions include digital simulation, smart implants, and biomechanically guided AI planning.