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前牙反(牙合)俗称“地包天”,即下颌前突畸形,下前牙咬在上前牙的唇侧,畸形的程度视咬合时前牙反覆盖的程度而定(即上切牙唇面至下切牙切缘的距离),反覆盖愈大,下颌前突畸形愈严重。轻度畸形时,面中1/3扁平,重度畸形时,面中1/3凹陷,有如全口无牙的老人面容。一般前牙反,上下前牙无咬合接触,不能发挥切割功能,因此牙周组织缺少功能刺激
Anti-occlusion of the anterior teeth (Occlusal) commonly known as “to the sky”, that mandibular protrusion deformity, lower anterior teeth bite in the anterior teeth of the labial side, the degree of deformity depending on the occlusion of anterior teeth cover the extent of the cover (that is, The distance between the lip and the lip to the incision of the lower incisor), the larger the anti-cover, the more serious deformity of the mandibular protrusion. Mild deformity, the surface of 1/3 flat, severe deformity, the surface of 1/3 depression, like a full mouth toothless elderly face. General anti-anterior teeth, upper and lower anterior teeth without occlusal contact, can not play the cutting function, the lack of periodontal tissue function stimulus