Prevalence of peri-implant diseases in fully edentulous patients restored with four implants supported fixed full arch prosthesis: a literature review

Background and Objective: "All -on -four" is a popular protocol due to shortened treatment time and financial feasibility. This has also been justified by the high survival rates of 95.4% over 7 years. However, the prevalence of peri-implant diseases is still not well explored. A review of the literature was performed to identify prevalence of peri-implant diseases in patients restored with full -arch four implants supported fixed restorations. Methods: This review used electronic literature search of PubMed database to obtain recent and the most relevant English -language scientific information from previous systematic reviews, consensus statements, and clinical trials published between 1995-2021. Key Content and Findings: Due to an inability to identify a study, or studies, that answer the PICO question or provide conceptual homogeneity, no Meta -Analysis was conducted. Based on the limited number of articles that were included in this study peri-implant mucositis ranged up to 30.2% at the patient and upto 18.3% at the implant level, while peri-implantitis ranged up to 25% at the patient and up to 7.2% at the implant level with 5-10 years of follow-up. Conclusions: Despite the prevalence of peri-implant diseases, the all -on -four treatment modality for completely edentulous arches has moderately high long- and medium -term survival outcomes (implants and prosthesis). Strict maintenance and follow-up are highly recommended to minimize biologic complications.