Page 97 - Impact of implant retained overdenture treatment and speech, oromyofunction, social participation and quality of life.

Speech, OMF and OHRQoL in OD on MDI in the maxilla
Fig 1. Sagittal view on the oral cavity with contact spots of the tongue (1) to the palate (2) with normal dentition (left), conventional denture (middle) and horse-shoe overdenture on MDI (right).
in rehabilitation with single implants. All groups had normal oromyofunctional behavior and reported mostly problems with the /s/ sound.14 Additionally, clinical experience shows that dental implants placed in a resorbed alveolar processus are often mispositioned due to the resorption of the crest in palatal direction. Because of that, overdentures can have to wide bucco-lingual volumes, causing obstruction of the tongue during speech or movement. The study of Collaert et al. (2015) states that it is possible that removing some of the volume of the denture on the palatal side of the premolar region can solve this problem. In their study ten edentulous patients who received fixed prosthesis in the maxilla were examined for speech problems at four occasions with proper adaptation. They found that in some patients the /s/ sound seemed distorted, even after adaptation. After reduction of the volume of the premolar region of the denture all patients returned to baseline speech or improved speech.22 The most common distorted sounds are the /s/, /z/, /ʃ/ (as in show), /ʒ/ (as in garage) and /t/.
Research on oromyofunctional behavior does not report severe problems in implant treatment of any kind. 13, 14, 16, 23 Research of Molly and coworkers (2007) showed an increase of tongue thrust in patients receiving fixed dentures in the maxilla. This is the frontal position of the tongue during rest and swallowing. This could be affected by the conversion of a palate covering denture to an implant prosthesis without palatal coverage.
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