Aims: The objectives of the present study were to establish Tweed facial triangle norms in Qatari and to compare the result with Tweed norms and previous reported results in different racial groups.
Material and method: The sample consisted of 89 lateral cephalometric radiographic radiographs, 75 patients were females and 14 were males with age range 18 to 25 years old (Mean 20.7. +/-2.3).
Results: The result of the present study showed that the mean values of FMA 33.5 º +/- 6.2 º FMIA 52.8 º +/- 9.5 º angles and IMAP 94.5º +/- 8.8º were significantly higher than Tweed norms. The comparison with Black Brazilian and Bangladeshi indicated extremely statistically significant differences in FMA and IMPA angles whereas in Nepalese, extremely significant difference was observed in FMIA and FMA angles.
Conclusions: Tweed’s Facial Triangle mean values were established for Qatari. However, Tweed facial triangle norms should be used only as a guide and not as an absolute value. Hence, using specific norms for specific race or ethnic group will help in providing more accurate diagnosis and treatment planning.
Downs, W. Variations in Facial Relationship: Their Significance In Treatment and Prognosis1. Angle Orthod. 19(3): 145-55. 1949.
Steiner, C. C. Cephalometric for you and me." Am J Orthod. 39(10): 729-55. 1953.
Tweed, C. H. The Frankfort-Mandibular Incisor Angle (FMIA) In Orthodontic Diagnosis, Treatment Planning and Prognosis." Angle Orthod. 24(3): 121-69. 1954.
Ricketts, R. M. Cephalometric Analysis and Synthesis." Angle Orthod. 67 (2): 125-38. 1961.
Jacobson, A. The Wits appraisal of jaw disharmony. Am J Orthod. 67(2): 125-38. 1975.
McNamara, J. A., Jr. A method of cephalometric evaluation." Am J Orthod. 86(6): 449-69. 1984.
Chan GK. A cephalometric appraisal of the Chinese (Cantonese). Amer J Orthod 61: 279-85. 1972.
Drummond RA. A determination of cephalometric norms for the Negro race. Amer J Orthod 54: 670-82. 1968.
Hideki Ioi, Shunsuke Nakata, Akihiko Nakasima, Amy L CountsComparison of cephalometric norms between Japanese and Caucasian adults in antero-posterior and vertical dimension. Eur J Orthod. 29:493-9. 2007.
John Wu, Urban Hägg, Bakr A, Rabie M. Chinese norms of McNamara's cephalometric analysis. Angle Orthod;77(1):12-20. 2007.
Emmanuel Olubusayo Ajayi. Cephalometric Norms of Nigerian Children. Am J Orthod Dentofac.Orthop. Nov;128(5):653-6. 2005.
Hamdan A. M. Rock W. P. Cephalometric Norms in an Arabic Population. British Orthodontic Society..Vol 28 No. 297-300. 2001.
Marlon Alvaro Moldez. Koshi Sato Junji Sugawara Hideo Mitani. Linear and Angular Filipino Cephalometric Norms According to Age and Sex. Angle Orthod. 76 (5): 800–05. 2006.
Tweed CH. The Frankfort-mandibular plane angle in orthodontic diagnosis, classification, treatment planning, and prognosis. Am J Orthod Oral Surg. 32: 175-232. 1946.
Tweed CH. Was the development of the diagnostic facial triangle as an accurate analysis based on fact or fancy? Am J Orthod. 48: 823-40. 1962.
Hasund A, Böe OE. Angle Floating Norms as Guidance for the Position of the Lower Incisors. Angle Orthod. Jul;50(3):165-8. 1980.
Mills, J. R. E. Principles and Practice of Orthodontics.Churchill Livingstone, Edinburgh. 1982.
Williams P. Lower Incisor Position in Treatment Planning. Bri J. of Orthod. Volume 13, - Issue 1. 33-41. 1986.
Domenico Ciavarella , Michele Tepedino , Crescenzio Gallo , Graziano Montaruli, Khrystyna Zhurakivska, Ludovica Coppola, Giuseppe Troiano, Claudio Chimenti, Michele Laurenz, Lucio Lo Russo. Post-orthodontic position of lower incisors and gingival recession: A retrospective study. J Clin Exp Dent. 9 (12): e1425-30. 2017.
Bhattarai P. and Shrestha RM. Tweeds analysis of Nepalese people. Nepal Med. Coll. J.13(2): 103-06. 2011.
Mayury Kuramae, Maria Beatriz Borges de Araújo Magnan Darcy Flávio Noue,r Gláucia Maria Bovi Ambrosano, Roger Cristiano Inoue. Analysis of Tweed’s Facial Triangle in Black Brazilian youngsters with normal occlusion. Braz J Oral Sci. - Vol. 3 - Number 8. 401-03. 2004.
Hasan Md Rizvi, Md Zakir Hossain. Cephalometric Profile of Bangladeshis: Tweed’s Analysis. APOS Trends in Orthodontics, Volume 7 Issue 3. 130-34. 2017.
Bangladeshis: Tweed’s Analysis. APOS Trends in Orthodontics, Volume 7 Issue 3. 130-34. 2017.
Insira Sarbeen, Saravana Pandian. Incisor Mandibular Plane Angle (IMPA) in Normo- divergent Individuals. Research J. Pharm. and Tech. 9 (10):1621-22. 2016.
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