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Wendl, B; Winsauer, H; Walter, A; Muchitsch, AP; Droschl, H; Jakse, N; Wendl, M; Wendl, T.
Morphological Criteria of Different Class III Manifestations, their Division and Variations in Time
INF ORTHOD KIEFEROR. 2016; 48(2): 73-78.
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Autor/innen der Med Uni Graz:
Droschl Helmut
Jakse Norbert
Muchitsch Alfred Peter
Wendl Brigitte
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Abstract:
Aim: of this work was to classify the Class III syndrom according to morphological criteria, to determine their frequency and to identify differences between the various forms in the course of treatment. Materials and methods: In a retrospective analysis 54 patients with a Class III syndrome were examined at 3 time intervals (at the beginning of treatment at the age of 6-9 years, after treatment and at a long-term control in adult patients after about 25 years). For classification by morphological criteria only the initial documents were consulted (before therapy). Results: In 40 % the Class III syndrom was caused due to the lower jaw. The upper jaw was responsible in 11 % of cases for the appearance of the Class III syndrome and in 49% a combination form was evident. In the lower jaw the primary cause for the development of a Class III syndrom is due to a large mandible (86.4%), in 9.1% the prognathic position of the mandible and in 4.5% a combination of both. In the maxilla the retrognathic position of the upper jaw is mainly responsible for the deformity (66,6%), followed in 16.7% by a too small maxilla and a combination of micrognathia and retrognathia. In combination cases a large lower jaw and the retrognathic position of the maxilla were dominant, followed by a larger lower and a smaller upper jaw. By classification of the different manifestations of prognathism significant differences with respect to the standard values occured in the course of treatment. At the onset of treatment the smaller SNA value was evident by maxillary retrognathia. During the long term control analysis, the class III combination group presented the largest difference between maxilla and mandible. NSGn and APDI values were closest to the standard values in cases of maxillary retrognathia and showed a larger lower facial height. In comparison, the values APDI in the groups of mandibular prognathism and the combination form had been significantly increased and even rose further on. NSGn increased especially in the group of mandibular prognathism. Conclusion: Manifestations of Class III syndromes vary greatly due to hereditary components. Therapeutic approaches can be modified and used more effectively by an accurate diagnosis.

Find related publications in this database (Keywords)
Class III
morphological criteria
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