Effect of different complete denture base plates morphology on phonetics A qualitative analysis based on computerized speech lab

Lei XIE; Xi YAO; Qian HOU; Yongyu DAI

ABSTRACT

BACKGROUND:

Palatal rugae assist for consonantal formation;however,effect of palatal rugae on phonetics has been previously reported to be involved in different complete denture base plates of recipients.

OBJECTIVE:

To qualitatively analyze the effe-cts of different palate base plate morphology on phonetics of edentulous jaw patients using a computerized speech lab.DESIGN,TIME AND

SETTING:

A contrast study was performed at the Department of Stomatology,Beijing Hospital of Healthy Administration,and at the Department of Otorhinolaryngology,Beijing Friendship Hospital affiliated to Capital Medical University between February 2007 and February 2008.

PARTICIPANTS:

Ten edentulous jaw patients wore complete denture with smooth surface and palatal rugae complete denture base.

METHODS:

Spike,voice onset time and transition of 10 edentulous iaw patients were measured by computerized speech lab when/da/,/ta/,/sa/,and/na/were pronounced.MAIN OUTCOME

MEASURES:

Spike.voice onset time and transition.

RESULTS:

Spikes were observed in all syllables.When/da/and/ta,were pronounced.voice onset time in the smooth surface group was significantly shorter than palatal rugae group(P<0.05)voice onset time of/d/and/t/in the palatal rugae group was similar to normal value(P>0.05).When/da/and/ta/ were pronounced,transition frequency in the smooth surface group was significantly lower than palatal rugae group(P<0.05),while that in the palatal rugae group was similar to normal value(P>0.05).

CONCLUSION:

As an anatomical landmark,palatal rugae contribute to phonetic restoration and consonant articulation of edentulous jaw patients.Computerized speech lab can quantitatively analyze phonetic changes after complete denture restoration and may be used as guidance for clinical dental prosthetics.