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由于恒牙胚的缺如,第二乳磨牙发生骨性粘连,要保持儿童和青年人牙弓的完整是有困难的。当牙槽骨生长时,由于第二乳磨牙的牙骨质与牙槽骨粘连,使第二乳磨牙不能和邻牙一起垂直向萌出,而位于邻牙的(牙合)平面以下。严重的病例,牙龈几乎可以复盖整个粘连牙的冠部。粘连牙的牙根常有足够长度,以维持功能。由于它“下沉”,可导致邻牙轴向倾斜,食物联塞,对(牙合)牙伸长,
Due to the lack of permanent tooth germ, the second molars occured osseous adhesions, it is difficult to maintain the integrity of the dental arch of children and young people. When alveolar bone growth, the second molars due to cementum and alveolar bone adhesion, so that the second molars can not be vertical along with adjacent teeth eruption, but located in the adjacent teeth (occlusal) plane below. Severe cases, the gums can cover almost the crown of the adhesive teeth. The root of adhesive teeth often have enough length to maintain function. As it “sinks” it can cause axial tilt of the adjacent teeth, food stuffing, elongation of the occlusal teeth,