The project aims to assess the effect of a complete denture of new denture wearers on speech production using sensors placed inside a duplicate of the prosthesis according to the technique described in the PRESLA system. Secondly, it aims to assess the effect of a complete denture on swallowing for these new denture wearers. Thirdly it aims to describe a precise mapping of the mechanical pressures exerted by the tongue on the palate of complete denture user, been used in wearing denture, during speaking and swallowing. The experiments will take place in the department of treatments and dental consultations of the Hospices Civils de Lyon (Faculty of Odontology, Lyon, France).

The evaluation of speech production is based on the characteristics of the pressure signal (time and frequency) and the acoustic signal after synchronization during time using duplicate with up to 8 sensors.

To reach the first objective, the investigators will focus on the patients who wear new complete denture during the first session of recording. They will first analyze the characteristics of the acoustic and pressure signals of the production of consonants. They shall select from 8 sensors, 3 sensors for the inferential analysis: a previous sensor in the alveolar zone, a median sensor in the palatal zone and a posterior sensor in the palatal area (on the border of the beginning of the soft palate). These 3 sensors will be selected on the basis of the amplitude of the variations of pressure during the task. This sensor's triplet will be specific to every patient. The investigators shall thus have after 3 sensors called: previous, median, posterior. They shall do, for every sensor's measurements and for the acoustic measures, an inferential statistical analysis based on one model shelf spaces generalized in mixed effects, in which the variable to be explained will be one of moderate variables, the fixed effects will be the session (just after wearing the prosthesis for the first time, 3 weeks later, 3 months later), the consonant, the index of the sensor (1 - 3, from the front to the back) and the index of the repetition (from 1 to 15), and where the random effect will be the patient.

Inclusion Criteria:

• Bimaxillary edentulous patients of both genders, over 18 years of age, requiring prosthesis (Cohort 1).
• Bimaxillary edentulous patients of both genders, over 18 years of age, with prosthesis made since at least one year (Cohort 2).
• Patients Affiliated with the French Social Security Insurance

Exclusion Criteria:

• Patients with speech or neurological disorders, or uncorrected or psychiatric sensory disorders
• Patients without French as native language
• Pregnant women
• Patients deprived of liberty or provided with legal protection
• Patients unable to support study constraints as determined by investigator
• Patients who have expressed their refusal to participate with the investigator
• Allergy to methacrylic resin