新鲜离体牛牙周韧带强度与组织结构的关系  

Relationship Between Tissular Structure and Strength of Fresh Bull Periodontal Ligament

作　　者：门庆林[1] 陈新民[1] 徐超[1] 任世鹏[1] 彭燕[1] 

机构地区：[1]四川大学口腔生物医学工程教育部重点实验室,成都610041

出　　处：《四川大学学报（医学版）》2010年第2期299-302,共4页Journal of Sichuan University(Medical Sciences)

摘　　要：目的研究牙周膜宽度和纤维含量对牙周膜强度的影响。方法取有完整牙列的牛新鲜离体下颌骨制备成5 mm×2 mm×10 mm的牙-牙周膜-牙槽骨复合体试件,在体视显微镜下测量牙周膜宽度,并在万能测试机上加载拉应力至试件断裂,记录应力-应变曲线,断端用天狼星染色,分析断面纤维含量,记录数据。结果得到牙周膜宽度与其最大应力的关系Y=9.786e-3.6693x,牙周膜宽度与其生理极限应力的关系Y=e2.188(-3.953)x,纤维百分比与其牙周膜的最大应力关系Y=20.788-0.755x+0.007x2,纤维百分比与其生理极限应力的关系Y=1.39e-14.x7.666,初始生理应力为0.28 N/mm2。结论随着牙周膜宽度的减少和纤维含量的增加牙周膜的强度增加。Objective To study the relationship between the width and the content of fiber in peridontal ligament（PDL） and the strength of peridontal membrane.Methods Fresh mandible of bull was obtained to prepare for a 5 mm×2 mm×10 mm cuboid including teeth,peridontal membrane,and alveolar bone.The width of the PDL was measured under a stereomicroscope. Pull stress was loaded on the test piece until it broke.The stress-strain curve was recorded.The broken ends of the PDL was dyed with siriue to analyze the content of fiber.Results The relationship between the width of the PDL and the maximum stress was expressed as Y=9.786e^-3.6693x.The relationship between the width of the PDL and the physiological ultimate stress was expressed as Y=e^2.188（-3.953）x.The relationship between the percentage of fiber and maximum stress was expressed as Y=20.788-0.755x＋0.007x^2.The relationship between the percentage of fiber and the physiological ultimate stress was expressed as Y=1.39e^-14·x^7.666.The initial physiological stress was 0.28 N/mm^2.Conclusion The strength of PDL increases with the decrease of PDL width and increase of fiber content.

关 键 词：牙周韧带 生物力学 强度 纤维含量 应力-应变曲线 

分 类 号：R78[医药卫生—口腔医学]