THE LATERAL CEPHALOMETRIC STUDY OF THE GROWING CHILDREN WITH CLASS III MALOCCLUSION BY MCNAMARA ANALYSIS

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Journal of the Korean Academy of Pediatric Dentistry 2001;28(3):412-420.
Published online August 31, 2001.

THE LATERAL CEPHALOMETRIC STUDY OF THE GROWING CHILDREN WITH CLASS III MALOCCLUSION BY MCNAMARA ANALYSIS

McNamara분석법에 의한 III급 부정교합 아동의 두부방사선 계측학적 연구

양규호, 김지영, 최남기

전남대학교 치과대학 소아치과학교실 및 치의학 연구소

Abstract

In the growing children with normal occlusion and class III malocclusion who need the early treatment to be helped to diagnose and to set up treatment plan by calculating the mean values of the lateral cephalometric measurements, cephalometric measurements by McNamara alalysis were achieved and compared on both the 84 elementary school children with normal occlusion and 83 class III malocclusion children at the age of 7 to 9 in Kwangju city and the results were as follows: 1. On the boys group, between normal occlusion and class III malocclusion, Effective maxillary length, Maxillomandibular differential, Facial axis, Nasion perpendicualr to pogonion, Point A perp to Mx 1, and A-Pog line to Mn 1 showed significant differences(p<0.05). 2. On the girls group, between normal occlusion and class III malocclusion significant differences were shown in Effective Maxillary length, Maxillomandibular differential, Mandibular plan angle, Nasion perpendicualr to Point A, Point A perp to Mx 1, A-Pog line to Mn 1(p<0.01). 3. There were no significant differences between normal occlusion and class III malocclusion of boys group but significant differences between them of girls group in Effective mandibular length(P<0.01). On the boys and girls group, Effective maxilla length of class III malocclusion was shorter than that of normal occlusion. 4. There were no significant differences between normal occlusion and class III malocclusion both in boys and girls at Anterior lower facial height. 5. There were significant differences between boys and girls both in class III malocclusion and normal occlusion at Anterior lower facial height and Mandibular plane angle(p<0.01).

Key Words: Class III malocclusion, Lateral cephalometric measurements, McNamara analysis