CONCLUSION: Structure weak area of tooth was the internal cause of cracked-teeth occurrence, and traumatic occlusal force was the external factor tha.
结论：牙结构的薄弱环节是牙隐裂发生的内在因素，创伤性(？)力是促使牙隐裂发生的外在动力。
CONCLUSION: Structure weak area of tooth was the internal cause of cracked-teeth occurrence, and traumatic occlusal force was the external factor tha.
结论：牙结构的薄弱环节是牙隐裂发生的内在因素，创伤性(？)力是促使牙隐裂发生的外在动力。
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