Functional tests are needed to assess the quality of reconstructive surgery after treatment of intraoral cancers. Quality of Life tests are subjective and Cinefluoroscopy is a demanding and non-comparative procedure. We develop here a method to test the capacity of patients to maximize use of their articulatory space. We recorded a corpus of sounds. These sounds were analyzed with classical signal processing procedures. By comparison with a non-distorded sound database, it was possible to evaluate speech disorders, localize the defect, and provide a guide for rehabilitation. This method is an objective, reproductible, and comparative measurement tool.