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Cephalometric evaluation of Class III malocclusion by a modified TweedMerrifield analysis


Cephalometrics. Class III malocclusion. Mandibular prognatism

How to Cite

Kuramae M, Magnani MBB de A, Pereira Neto JS, Caterina Groposo, Nouer PRA. Cephalometric evaluation of Class III malocclusion by a modified TweedMerrifield analysis. Braz. J. Oral Sci. [Internet]. 2015 Nov. 17 [cited 2024 Mar. 2];4(12):680-4. Available from:


A sample of cephalograms of 20 White Brazilian subjects (9 males, 11 females) of 17-36 years old, who presented Class III dental malocclusion was selected and traced. Results showed statistically significant differences among genders for FMIA, SNA, SNB, 1.NB, PFH, AFH, 1-NB and mandibular length. Anteroposterior jaw relation, as shown by SNA and SNB, presented a maxilla correctly positioned, as well as mandibular protrusion, which was related to a normal upper jaw length and an augmented lower jaw length. A vertical growth pattern prevailed, as evidenced by FMA, AFH, PHF and OCC.PL. Angle. The Z Angle, total chin and upper lip failed to clearly show any disturbance of facial esthetics and IMPA, 1.NA, 1- NA, 1.NB and 1-NB revealed dental compensation.


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