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Marcotte氏1981年7月发表文章注意到头的们置和下颌联合与前后骨骼的关系。颏部至鼻根点和到上齿槽座A点的关系,发现骨性颏后缩易发生自鼻根点较陡峭向上倾斜的S—N线,而颏前突S—N有较水平的倾斜度。发现20%的下齿槽座B点前后变化能用S—N线斜度的变化来解释。虽然Marcotte作S—N下7度线认为正常是水平的,但它的生物学改变和其它改变的关系仍取决于S—N线的特征。 Marcotte认为头的们置可直接影响S—N斜度的改变。还可能因颅内解剖结构的变
Marcotte's article, published in July 1981, noted the relationship between the head and jaw joint and the anterior and posterior bones. Chin to the nasal root point and the point to the alveolar Block A point found that bony chin snapping occurred from the nasal point more steep upward tilt of the S-N line, while the chin pres sure S-N level Tilt. Found 20% of the lower alveolar base B before and after the change can be used to explain the slope of S-N line changes. Although Marcotte's normalization of the 7-degree line at S-N is considered normal, the relationship between its biological changes and other changes is still dependent on the characteristics of the S-N line. Marcotte thinks head placement can directly affect the S-N gradient. May also be due to intracranial anatomy changes