Conclusion: If taken for lacking of effective treatment on teethfracture of prevention methods, then the fracture molar can be conserved.
结论：牙折裂只要采取及时有效的治疗，部分患牙是可以保留的。
2
Abstract: Objective to compare the restorative effects of crown lengthening surgery and gingivectomy on dowel crown of deep-seated subgingival teethfracture.
摘要：目的比较牙冠延长术与牙龈切除术用于残根残冠桩冠修复中的疗效。
3
The brittleness and cold temperatures of ice cubes can actually cause teeth to fracture.