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目的:研究牛牙周膜不同部位对弹性模量的影响。方法:选取成年牛磨牙制成标准牛牙周膜试件。通过万能材料测试系统测定同一磨牙不同部位试件中牙周膜的弹性模量。结果:牛牙周膜弹性模量并不是均匀一致的,根中部牙周膜的弹性模量值最高,牙颈部次之,牙根处牙周膜的弹性模量最小。结论:牛牙周膜弹性模量从牙颈部到根中部呈增大趋势,到根中部呈最大值,向根尖部层递减趋势。
Objective: To study the effect of different parts of bovine periodontal ligament on elastic modulus. Methods: The standard bovine periodontal ligament specimens were made from adult bovine molars. The elastic modulus of periodontal ligament in different parts of the same molar was measured by a universal testing system. Results: The elastic modulus of bovine periodontal ligament was not uniform, the periodontal ligament of root middle part had the highest elastic modulus value, the second part of tooth root part, and the periodontal ligament of tooth root. CONCLUSION: The elastic modulus of bovine periodontal ligament increases from the cervical part to the middle part of the root, reaches the maximum value in the middle part of the root, and decreases to the root part.