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由于目前还缺乏乳牙前期的肌肉压力测定资料,因而对肌肉压力在整个牙弓及颌骨发育中的作用尚不清晰。众所周知,功能与形态是互为因果的,因而我们不妨设想,在整个牙颌发育过程中,牙弓两侧的肌肉压力状态是不一样的。乳牙前期,吞咽功能为主,整个舌体填塞口腔,因而舌侧压力大于唇、颊侧压力,这种状态有利于颌骨的开展;以后随着颌骨的开展、牙齿的萌出及口腔体积的扩大,舌体相对后退,舌侧压力趋于减少,同时唇、颊侧的肌群功能由于咀嚼及表情的需要不断加强,肌纤维增粗增厚,对唇、颊侧的压力也不断增加。这样,扩展颌骨的动力渐渐削弱,直到成年后由于颌骨外扩的动能不足使颌骨的性质固定下来。当然,这种设想的合理性有待实验的进一步证实。
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