医学论文范文:不同牙体剩余量对石英纤维桩冠抗折性能的影响
【摘要】 【目的】 评价不同牙体剩余量对石英纤维桩复合树脂核全冠修复下颌前磨牙抗折性能的影响。【方法】 将正畸拔除的50颗单根前磨牙按颈部牙体剩余量分为5组(0、1、2、3 mm组和对照组),离体牙行纤维桩复合树脂核金属烤瓷全冠修复,使用速率为1 mm/min的45°角侧向加载。【结果】 牙体剩余量0、1、2、3 mm、对照组的荷载力均值分别为(601 ± 83)、(665 ± 59)、(950 ± 75)、(1005 ± 94)、(1027 ± 80) N; 0 mm和1 mm组的荷载力值小于2 mm和3 mm组以及对照组,差异具有统计学意义(P < 0.05)。【结论】 牙体剩余量为2 mm时,石英纤维桩冠修复体抗折强度与对照组无明显差异,可认为2 mm是非金属桩箍效应的临界值。
【关键词】 桩冠; 牙体剩余量; 石英纤维桩; 侧向加载
Effects of Different Amount of Residual Tooth on Fracture Resistance Abilityin Quartz-Fiber Post Crown
NIE Er-min1, CHEN Xia-yun2, QI Li-li1, LIU Ke-jin1, WANG Xiao-li1, ZHANG Chun-yuan1医.学全.在.线网站www.lindalemus.com^
(1. Department of Stomatology, The First Affiliated Hospital, SUN Yat-sen University, Guangzhou 510080, China;
2. Department of Stomatology, The Third Affiliated Hospital, SUN Yat-sen University, Guangzhou 510630, China)
Abstract: 【Objective】 To evaluate the effects of the different amount of residual tooth on the fracture resistance ability of lower premolars restored with fiber quartz-fiber post-core and full crown. 【Methods】 Fifty single rooted lower premolars recently extracted from orthodontic patients were divided into five groups according to the different amount of residual tooth (0,1,2,3 mm and the control group). All the teeth were restored with fiber post-core and full crown. Loads were applied at an 45-degrees to the long axis of the teeth at a crosshead speed of 1 mm/min. 【Results】 The mean loading force were (601 ± 83), (665 ± 59), (950 ± 75), (1005 ± 94), and (1027 ± 80) N in the groups with the amount of residual tooth for 0,1,2,3 mm and the control group; While the mean loading force in 2 mm and 3 mm and the control groups was significantly higher than that in 0 mm and 1mm groups(P < 0.05). 【Conclusion】 There was no significant deference in the fracture resistance ability between the group with 2 mm amount of residual tooth with quartz-fiber post-core crown and the control group. The 2 mm may be the value of ferrule effect for non-metal post system.
Key words: post crown; amount of residual tooth; Quartz-Fiber Post; lateral loading