Hayder A Hashim, Khalid Al Balkhi.
Soft tissue relation and Tweed triangle in a Saudi sample.
Pak Oral Dental J Jan ;22(2):127-32.

The present study consisted of 50 cephalometric radiographs of Saudi male subjects aged 12 to 30 years. Each subject was evaluated following the method proposed by Merrifield. Further, the angles formed the Tweed triangle were also measured. Descriptive statistics and t-test were used in the analysis of the data. The results obtained were as follows: The average measurements of the angles of Tweed triangle were FMA 35.4 degrees, IMPA 93.1 degrees and FMIA 51.5 degrees. The Z-angle and Z-I angle of Class I occlusion were significantly higher than that in Class II. The integumental chin, total chin and upper lip did not show significant differences between Class I and Class II. Furthermore, in class I and class II, the H`line in the majority of the cases contacted the lower lip. Differences between these results and similar data obtained in Caucasian and Japanese were ascribed to racial characteristics. The results of the present study highlights the need for further research on a large sample size collected from the different provinces in Saudi Arabia where further ethnic variations may be identified.

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