بررسي CLOSEST SPEAKING SOACE در كلاسهاي مختلف انگل در دانشجويان و مراجعين به بخش تشخيص دانشكده دندان پزشكي دانشگاه علوم پزشكي شهيد بهشتي

Evaluation of Closest Speaking Space in Angle different classes in students and patients referred to Oral Medicince Department of Shahid Beheshti University Dental School

Background & Aim: The determination of a correct vertical dimension of occlusion is a critical procedure in restorative dentistry. Phonetic based technique (closest speaking space) is one of the most common methods in determination of vertical dimension. The aim of this study was to evaluate the closest speaking space in Angle different classes in students and patients referred to Oral Medicine Department of Shahid Beheshti University Dental School. Method & Material: The study was descriptive and its technique was observation. Closest speaking space was investigated in 106 dentate subjects with the mean age of 23 ± 4 years. The closest speaking space was defined as the difference in vertical position, measured at the anterior region, between mandibular position while pronouncing sibilant sounds (eg, "yes", "six"), and maximum intercuspation in three patients positions (supine, semisupine and upright). Results: The mean closest speaking space among Cl I subjects was measured 2.31 ±1.44 mm, for Cl II subjects, it was 3.39± 1.48 mm and 2.33±1.54 mm for Cl III subjects. Conclusion: The difference between C.S.S. in different Angleʹs classes was statistically significant (P<0.005). Closest speaking space did not differ in patient positions. The correlation coefficient between C.S.S and overbite was a relatively high (0.779) which was statistically significant (P<0.01). There was not any considerable difference in C.S.S. between two sexes.