Voice training is done to find an appropriate source of sound production that can be articulated for communication purposes. Criteria for selecting sound source include: degree of tissue loss, esophageal stenosis, physical limitations of the patient; noise level of the patients environment; motivation level; and patients preference of sound source.
Types Of Sound Source
There are mainly three types of sound source a patient can choose from. These are: external man-made prosthesis or artificial larynx; sphincter like junction of the pharynx and esophagus or esophageal speech; and lastly, surgically implanted device or transesophageal puncture and silicon prosthesis.
Artificial Larynx
The principle of artificial larynx is to have an external mechanical sound source that is substituted for the larynx. Anatomic structures for articulation and resonance are most of the time unaltered.
There are two general types of electrolarynges that are available: neck type and intra oral type. The neck type is placed flush to the skin on the side of the neck, under the chin, or on the cheek. Sound is conducted via the oropharynx and is articulated normally....
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