Mechanisms of endosseous integration.

TLDR

Osseointegration describes implant anchorage but offers no mechanistic insight into bone healing around implants. The paper aims to delineate the sequence of peri‑implant bone healing into three distinct phases—osteoconduction, de novo bone formation, and remodeling—to guide biologic design criteria for implant surfaces. Osteoconduction involves migration of osteogenic cells to a scaffold anchored by implant surface design; de novo bone formation deposits a mineralized matrix whose bonding depends on surface topography; remodeling then refines the bone‑implant interface. Dental implant outcomes hinge on surface designs that optimize the biological response in each of these three integration mechanisms.

Abstract

Although the clinical term "osseointegration" describes the anchorage of endosseous implants to withstand functional loading, it provides no insight into the mechanisms of bony healing around such implants. Nevertheless, an understanding of the sequence of bone healing events around endosseous implants is believed to be critical in developing biologic design criteria for implant surfaces.This discussion paper shows that peri-implant bone healing, which results in contact osteogenesis (bone growth on the implant surface), can be phenomenologically subdivided into three distinct phases that can be addressed experimentally. The first, osteoconduction, relies on the migration of differentiating osteogenic cells to the implant surface, through a temporary connective tissue scaffold. Anchorage of this scaffold to the implant surface is a function of implant surface design. The second, de novo bone formation, results in a mineralized interfacial matrix, equivalent to that seen in cement lines in natural bone tissue, being laid down on the implant surface. Implant surface topography will determine if the interfacial bone formed is bonded to the implant. A third tissue response, that of bone remodeling, will also, at discrete sites, create a bone-implant interface comprising de novo bone formation.Treatment outcomes in dental implantology will be critically dependent on implant surface designs that optimize the biologic response during each of these three distinct integration mechanisms.