Wits appraisal and Tweed triangle for a sample of Iraqi adults

F. K. Al-Khawaja, Noor; A. Yassir, Yassir; Nahidh, Mohammed

	Wits appraisal and Tweed triangle for a sample of Iraqi adults
Journal of baghdad college of dentistry
Article 1, Volume 23, Issue 4, 2011, Pages 134-140
Authors
Noor F. K. Al-Khawaja; Yassir A. Yassir; Mohammed Nahidh
Abstract
ABSTRACTBackground: This study aimed to establish the normal value of Wits appraisal and Tweed triangle for a sample of Iraqiadults and to verify the existence of sexual dimorphism.Materials and Methods: 95 dental students (41 males and 54 females) having normal occlusion and acceptablefacial profile were chosen for this study. Each student was subjected to clinical examination and digital true lateralcephalometric radiograph. The radiographs were analyzed using AutoCAD 2007 to measure the distancerepresenting the Wits appraisal and the angles representing Tweed triangle. Descriptive statistics were obtained forthe measurements for both genders separately and for total sample; independent samples t-test was performed toevaluate the gender difference.Results: The results indicated that the mean value of Wits appraisal was higher in males than females with a nonsignificantdifference between both genders, on the other hand, the Frankfort- mandibular plane angle was higher inmales than females while the Frankfort- mandibular incisor angle was higher in females than males and mandibularincisor- mandibular plane angle was nearly similar in both genders with a non-significant difference.Conclusions: The normal values of Wits appraisal and Tweed Triangle were established. The Iraqi sample showed Witsappraisal of females near to that of Jacobson while of males was higher. Regarding Tweed triangle, both gendersshowed more proclination of lower incisors than of Tweed with a Frankfort- mandibular plane angle near to that ofTweed.Key words: Tweed triangle, Wits appraisal. (J Bagh Coll Dentistry 2011;23(4):134-140).

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