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To assess the positional variations of maxillary horizontal and vertical plane with respect to infrazygomatic crest (key ridge) in skeletal class I, II and III cases. Materials and methods: A total of 103 lateral cephalograms comprising of 40 skeletal class I (control group), 35 class II and 28 class III cases were selected and analyzed. Six parameters were chosen to compare the vertical and the horizontal Results: key ridge in class II and III was 2.42° and 6.97° as compared to class I which was 5.35°. The mesiobuccal cusp tip of maxillary respectively as compared to class I (1.62 mm). The mesiobuccal was 2.14 and 2.82 mm as compared to class I (1.27 mm). Conclusion: infrazygomatic crest and was ahead of the key ridge in all the mesially in class II and III cases as compared to the class I cases but, in class III, it was more upright as compared to class I and II.

world journal of dentistry

Assessment of Positional Variation of Maxillary Permanent First Molar with respect to the Infrazygomatic Crest (Key Ridge) in Skeletal Class I, II and III Cases