A method for classifying forms of mandibular prognathism

• Published in: Japanese Journal of Oral and Maxillofacial Surgery Vol. 32; no. 8; pp. 1352 - 1361
• Main Authors: FUKAYA, Masahiko, YASUDA, Kazuyuki, TSUJI, Satoshi, INAMOTO, Hiroshi, TAKAI, Yoshiki
• Format: Journal Article
• Language: English
• Published: Japanese Society of Oral and Maxillofacial Surgeons 1986
• Subjects: classification; Mandibular prognathism; relative relationship
• ISSN: 0021-5163; 2186-1579; 2186-1579
• DOI: 10.5794/jjoms.32.1352

Angular and dimensional linear analysis were performed on 100 patients with mandibular prognathism. The results were classified to show the relationship between maxilla and mandibule. Details are given below: Sanborn's classification was followed for angular classification. Group A: Maxilla within the normal range, mandibule beyond the normal range. Group B: Mandibule within the normal range, maxilla below the normal range. Group C: Maxilla and mandibule within the normal range. Group D: Maxilla below the normal range, mandibule beyond the normal range. Group E: Maxilla and mandibule beyond the normal range. The linearly measured classification was performed according to the distance from a line perpendicular to SN plane through S to Point A and Pogonion. typea-type e has the same relationship as Group A-Group E. type f: Maxilla and mandibule below the normal range. There were considerable differences between the angular and the linearly measured analyses. Which seems to have a close relationship to the distance of S-N. It seems to be useful to display both classifications together in order to grasp precisely the form of mandibular prognathism and also to be useful clinically.