engleski

Head position and free-way space in different vertical dimension measurements

The aim was to compare 3 methods for determination of vertical dimension, which are often used in clinical practise and to study influence of changing head position to interocclusal space. One hundred of healthy fully dentate subjects (18-36 yrs.) with Angle Class I were instructed to say "s", "mi" and to maintain postural rest position until the freeway space was measured. This was done in different head positions: straight, head leaned back and head leaned forward. Measurements were performed between upper and lower central incisors, canines and first molars. There was no significant differences between gender. Interocclusal space decreased from incisors towards molars. Head position had significant impact on the size of free-way space in postural rest position. During speech of "s" and "mi" the size of free-way space remained constant. These findings confirm that clinical determination of vertical dimension should include speech methods rather than relaxation. Results also revealed significant positive correlation between vertical overlap and interocclusal space during speech of "s" (r=0.7) and "mi" (r=0.5) and weak correlation during postural position (r=0.35).Horizontal overlap was significantly, but weakly associated with "s" pronunciation (r=0.2), while for "mi" and rest position of the mandible, there was no significant correlation.

head position; free way space; vertical dimension of occlusion

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