 The effectiveness of mandibular overdentures retained by 2 dental implants and its impact on Oral Health-Related Quality of Life OHRQoL and patient satisfaction has been extensively documented over the last decades1-6. According to recent systematic reviews, the implant survival rate of this oral rehabilitation concept reaches more than 95 7-10. The scientific validation of the efficacy of such a rehabilitation concept has influenced the social security system of several countries like Belgium. Therefore, this treatment approach is nowadays considered as an evidence-based and cost-effective treatment option improving the function and quality of life of mandibular edentulous patients. Unfortunately, cost-effective treatment concept to restore the edentulous maxilla not has been widely documented 11. Many studies display high success rates of fixed implant-supported rehabilitations of the edentulous maxilla 12 but these treatment options remain costly and are therefore reserved to a limited social category of patients. 