Effect of Malocclusion on Mandibular Movements during Speech
1992 Volume 36 Issue 2 Pages 396-403
Details
1992 Volume 36 Issue 2 Pages 396-403
In order to investigate the effect of malocclusion on mandibular movements during speech, the envelope of the mandibular movements during speech were analyzed in 10 normal subjects and 60 subjects with malocclusion. Results were summerized as follows:
1. The most superior point of the envelope was located in the normal occlusion side in the unilateral posteiror malocclusion, and was located inferiorly in the deep overbite and anterior crossbite.
2. The most posterior point and the most inferior point were located posteriorly in the anterior crossbite, and were located superiorly in the edge-to-edge bite.
3. The most anterior point was located anteriorly in the anterior openbite, and was located postero-superiorly in the edge-to-edge bite, and was located postero-inferiorly in the anterior cross-bite.
4. The antero-posterior width and the superio-inferior height were not affected by any malocclusions.
5. The speech envelope was guided by the protrusive path in the normal occlusion and the malocclusion in the posterior teeth, and was guided by both the protrusive and the lateral paths in the deep overbite. The speech envelope was not guided by any paths in the edge-to-edge bite, anterior openbite and anterior crossbite.
It can be concluded that the mandibular movements during speech are characteristically affected by malocclusion.
