The Measurement Of Masseter Muscle Thickness, The Cephalometric Analysis Of Mandibular Angle, And The Aesthetic Correction Of Masseteric Or Mandibular Angle Hypertrophy

The masseteric hypertrophy or prominent mandibular angle is not rare in Orientals. The square face, which can be caused by any of these two conditions, is not preferred by most Oriental women. Alternative treatment directed against causative factors is present. Therefore, it is crucial to determine the right factor before embarking a treatment.However, lack of objective and definitive quantitative parameters relevant to the features of Chinese people tends to affect to formulate a treatment scheme and to get a good result.In this research we measured ultrasonically the thickness of the masseter in young adults and quantitatively evaluated the outline of mandibular angle by cephalometrics, and then performed a research in surgical and medical management of the hypertrophy of masseter and mandibular angle.Part One: Based on the quantitative analysis of the thickness of masseter muscle and of the outline of mandibular angle, the normal range of the above relevant parameters was obtained, which provides scientific basis for clinical diagnosis and management of the masseteric or mandibular angle hypertrophy.Paper 1. The aims of this study were to quantify the normal range of the ultrasonically measured thickness of the masseter in adults and to test whether the variation in the thickness of the muscle is related to the variation in the facial morphology in different individuals. In 50 healthy, fully-dentate young adults, 25 men and 25 women, the masseter thickness was measured bilaterally by a real-time ultrasound imaging technique. The measurements were performed under both relaxed conditions and with maximal clenching. Standardized facial photos of the subjects were taken so that their facial morphology could be determined. The result showed that the mean thickness of the masseter in both conditions in men was larger than that in women and that the thickness of the muscle was related to the facial morphology, mainly in men, but not in women; the men with a thin masseter had a proportionally...