An acoustic investigation caused by pontic formation.

Prosthetics for cases with large defects of alveolar bone often tend to be difficult. We researched the acoustic effects of various pontic forms to satisfy a patient's expectations for both phonetics and aesthetics.

[Acousticodynamic investigation of palatal rugae given by the pressure impression method].

This time, we used palatal plates with the individual palatal rugae using the plastic plate for copying the individual palatal rugae easily, and studied the influence of the pronunciation concerning the changes of the Formant frequencies with Sound Spectrograph.

[Acoustic investigation of various palatal rugae].

We use some palatal plates with some Kinds of palatal rugae; ready made, patterned, individually copied and omitted, and studied the influence of the pronunciation acoustically concerning the Formant Frequency.