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首页> 外文期刊>American journal of dentistry >Shear resistance of fiber-reinforced composite and metal dentin pins
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Shear resistance of fiber-reinforced composite and metal dentin pins

机译：纤维增强复合材料和金属牙本质钉的抗剪强度

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Purpose: To assess whether dentin pins increase shear resistance of extensive composite restorations and to compare performance of mini fiber-reinforced composite (FRC) anchors with metal dentin pins in the laboratory. Methods: 30 extracted sound molars were randomly divided into three groups. Occlusal surfaces were ground flat with a standard surface area and resin composite restorations were made in Group A. In Groups B and C similar restorations were made, with additionally four metal pins placed in Group B and four P7RC pins in Group C. Specimens were statically loaded until failure occurred. Failure modes were characterized as intact remaining tooth substrate (adhesive or cohesive failure of restoration) or fractured remaining tooth substrate. Results: Mean failure stresses were 6.5 MPa (SD 3.2 MPa) for Group A, 9.7 MPa (SD 2.6 MPa) for Group B and 9.2 MPa (SD 2.6 MPa) for Group C. Difference in mean failure stresses between Group A and Groups B and C was statistically significant (P= 0.01), while the difference between Groups B and C was not (P= 0.63). Failures of the restoration without fracture of tooth substrate were seen for 80% of specimens in Group A and 20% in Groups B and C (P= 0.04). (Am J Dent 2013;26:39-43).
机译：目的：评估牙本质钉是否会增加广泛的复合材料修复体的抗剪切力，并在实验室中比较微型纤维增强复合材料（FRC）锚钉与金属牙本质钉的性能。方法：将30颗提取的磨牙磨牙随机分为三组。咬合面被打磨成具有标准表面积的平面，在A组中制作了树脂复合修复体。在B和C组中进行了类似的修复，另外在B组中放置了四个金属销，在C组中放置了四个P7RC销。加载直到发生故障。破坏模式的特征为完整的剩余牙齿基体（修复体的粘合或内聚破坏）或破裂的剩余牙齿基体。结果：A组平均破坏应力为6.5 MPa（SD 3.2 MPa），B组为9.7 MPa（SD 2.6 MPa），C组为9.2 MPa（SD 2.6 MPa）。A组和B组之间的平均破坏应力差异C组具有统计学意义（P = 0.01），而B组和C组之间的差异无统计学意义（P = 0.63）。 A组中80％的标本以及B和C组中20％的标本均未出现修复体而没有牙齿基体断裂的情况（P = 0.04）。 （Am J Dent 2013; 26：39-43）。

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