Conclusion the fracture strength of premolar teeth filled with light curing composite resin was higher than filled with amalgam after root canal therapy.
结论根管治疗后用光固化树脂充填前磨牙的各类洞，牙体的抗折强度优于用银汞充填者。
The brittleness and cold temperatures of ice cubes can actually cause teeth to fracture.
冰块的脆性和低温竟然能致牙齿断裂。
Methods 16 cases with fracture or exfoliation on the area of anterior teeth and premolar were selected, the damage's parts of prosthesis were recorded, and the causes of failure were analyzed.
方法随机选择16例前牙和前磨牙区因瓷裂或瓷崩而导致失败的病例，记录修复体损坏的部位，分析产生失败的原因。
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