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引起下颌前牙拥挤的原因常涉及到未萌出的第三磨牙的压力。为此,作者通过两项实验研究,测量了未萌出的下颌第三磨牙产生的近中压力。试图说明下颌第三磨牙与前牙拥挤之间的关系。实验假设推测第三磨牙近中萌出压力对牙间力的影响类似于第二磨牙轴向载荷时产生的近中向(牙合)力。此力将增加与第二磨牙近中的邻接紧密度。从而在一侧拔除了第三磨牙,消除了此力后,这一侧的邻接紧密度将减小,以证实第三磨牙近中萌出压力的存在;或一侧拔除了第三磨牙后,两侧折邻接紧密度没有变化,以证实第三磨牙近中萌出压力不存在或很小。第一项实验在平均年龄20.6岁的14名男性和6名女性患者中进行。受试者双侧第三磨牙均未萌出,但在X线全景片上可观察到第三磨牙已与第二磨牙发生接
The cause of mandibular anterior crowding often involves the pressure of a non-erupted third molar. To this end, the author through two experimental studies, measuring the eruption of the mandibular third molar near-mid-pressure. Trying to explain the relationship between mandibular third molars and crowding of anterior teeth. Experimental hypothesis that the third molar near eruption pressure on the interdental force is similar to the second molar axial load generated when the proximal (occlusal) force. This force will increase the proximal abutment with the second molars tightness. Thereby removing the third molar on one side, eliminating this force, the side of the adjacent tightness will be reduced to confirm the existence of the third molar near the eruption pressure; or removal of the third molar on one side, the two There was no change in the abutment tightness of the side folds to confirm the presence or absence of near-middle eruption pressure of the third molars. The first experiment was performed in 14 males and 6 females with a mean age of 20.6 years. Subjects both sides of the third molars did not erupt, but the X-ray panoramic film can be observed on the third molars have occurred with the second molars