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Summary
This study shows that jaw movements during speech are precise and repeatable, particularly for the 's' sound. Intra-oral appliances do not significantly affect this precision, suggesting stable vertical dimension determination for dentures.
Area of Science:
- Biomechanics
- Speech Science
- Prosthodontics
Background:
- Understanding jaw movement is crucial for speech analysis and dental prosthetics.
- Previous research has explored factors influencing mandibular motion during speech.
Purpose of the Study:
- To describe a method for transducing mandibular movements in speech using synchro-transmitters.
- To investigate the role of incisal occlusion in jaw movement.
- To assess the precision and repeatability of mandibular positions, especially for the 's' sound, and the impact of intra-oral appliances.
Main Methods:
- Utilized synchro-transmitters to record mandibular movements during speech.
- Analyzed the amount and direction of jaw movement in relation to incisal occlusion.
- Evaluated the precision of mandibular positions with and without intra-oral appliances of varying dimensions.
Main Results:
- Incisal occlusion significantly influences the amount and direction of jaw movement.
- Mandibular positions, particularly for the 's' sound, demonstrated high precision and repeatability.
- The insertion of intra-oral appliances did not significantly alter the positional precision of the jaw.
Conclusions:
- Mandibular movements in speech exhibit significant precision and repeatability.
- The findings suggest that intra-oral appliance dimensions are unlikely to affect the precision of vertical dimension determination in full denture construction.