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The All-ON-4® Treatment Concept is a procedure for the total rehabilitation of the edentulous patient or for patients with badly broken down teeth, decayed teeth or compromised teeth due to gum disease, The concept was developed, institutionalized and systematically analyzed in the 1990’s by Portuguese Dentist Paulo Maló. It consists of the rehabilitation of the edentulous maxilla and mandible with fixed prosthesis by placing four implants in the anterior maxilla, where bone density is higher. The four implants support a fixed prosthesis with 12 to 14 teeth. In 2011, Nobel Biocare Services AG trademarked ALL-ON-4® in the United States.