Bleeding on Probing around Dental Implants: A Narrative Review

Peri-implant bleeding is an important early sign of inflammation around dental implants and serves as a diagnostic indicator of peri-implant mucositis and peri-implantitis, both of which can lead to implant failure if, not treated promptly. The present review aims to provide insights into Bleeding on Probing (BOP) around dental implants. Data collection for this review involved gathering and analysing relevant literature to synthesise findings, identify patterns, and evaluate key results across studies. Histological studies reveal that peri-implant bleeding is associated with the infiltration of inflammatory cells such as neutrophils, macrophages, and lymphocytes, which is comparable to periodontal disease. This inflammation disrupts the peri-implant epithelium, increases vascularisation, and destroys connective tissue, all of which indicate early tissue damage around the implant. Inflammation also affects Peri-implant Crevicular Fluid (PICF), leading to increased levels of pro-inflammatory cytokines such as Interleukin (IL) 1β and Tumour Necrosis Factor (TNF)-α, as well as Matrix Metalloproteinases (MMPs) that contribute to tissue destruction. These molecular alterations make PICF an effective diagnostic tool for determining the severity of peri-implant disease. Clinically, BOP around implants is a commonly used metric to assess peri-implant health, although its prognostic value varies due to structural differences between peri-implant tissues and those surrounding natural teeth. However, significant or prolonged bleeding indicates poor healing, infection, or inadequate tissue management, all of which can impede osseointegration-the process by which the implant integrates with the bone. While peri-implant bleeding is a natural component of the healing process under controlled conditions, persistent bleeding may signal complications. Therefore, peri-implant bleeding should be monitored regularly to facilitate early detection and management, thereby preventing peri-implant disorders and ensuring the long-term success of dental implants.