Fifteen completely edentulous patients were included in this study to evaluate the effects of different head angulations on the vertical dimension of occlusion, lip support and facial contour.
For each patient, four st and ardized occlusion rims were constructed to determine maxillom and ibular relationships at the different angles [-20 degrees, zero degree, +20 degrees and +60 degrees] . A head angulation control board that could be mounted on dental chair was constructed. Lines were drawn on the board representing in the previous angles. A combination of swallowing and phonetic was used to determine the vertical dimension of occlusion. Clinical judgment was used to determine lip support and facial contour. For both maxillary and m and ibular casts, a hole was drilled in the center of the anterior crest of the cast. Each successive occlusion rim was then placed on the cast and a st and ardized hole was drilled from the opposite side and a st and ardized dowel post was passed through the hole. Measurements of both vertical and anterior-posterior components were recorded and statistically analyzed. The results showed no significant relations of vertical dimension of occlusion, lip support and facial contour to head angulations
Essam El Din M. Abdel Zaher ,
Evaluation of vertical dimension of occlusion, lip support and facial contour at different head angulations,
Al-Azhar Dent. J. 1994;
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