Fracture resistance of endodontically treated teeth restored with composite posts
Fracture resistance of endodontically treated teeth restored with composite posts
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DOI：
10.1067/mpr.2003.75
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发表时间：
2003-04-01
影响因子：
4.6
通讯作者：
Billy, E
中科院分区：
文献类型：
--
作者：
Newman, MP;Yaman, P;Billy, E
问题陈述。纤维增强复合材料的最新应用涉及它们作为桩和核系统的使用，以恢复牙髓治疗的牙齿。尽管最后一种应用已经被许多牙医宣传和临床使用，但是关于这些桩系统的物理性质的信息非常少。目的。本研究的目的是比较三种纤维增强复合材料桩系统对根管治疗牙的抗折强度和破坏模式的影响。将90颗上颌中切牙分为8个实验组和1个不锈钢（ParaPost）对照组，每组10颗。80颗牙齿被分配到两个主要的实验组，称为“狭窄”和“喇叭”的运河。对于窄根管组，使用相应的扩髓钻制备桩间隙，分别使用直径为1.5 mm、1.6 mm和2.0 mm的FibreKor、Lussent锚钉和Ribbond桩进行修复。对于扩口根管组，模拟薄壁根管。扩口根管的牙齿用相同的桩修复，但用锥形金刚石钻将其粘固到2 mm宽的锥形根管内。预制桩（FibreKor和Luscent锚钉）狭窄和喇叭形的运河分别与自聚合树脂水泥和流动复合材料，而定制的Ribbond桩与光聚合流动复合材料的两种运河类型。还准备了另外一组20个具有不同尺寸和形状的冠状部分的Ribbond桩，称为“Ribbond非标准化”，并进行了评价。用万能试验机以0.05 cm/min的十字头速度将试样加载至失效（kg），直至发生失效。资料分析采用方差分析和t检验（P
Statement of problem. The most recent application of fiber-reinforced composites involves their use as post and core systems to restore endodontically treated teeth. Even though this last application has been advertised and used clinically by many dentists, there is very little information regarding the physical properties of these post systems.Purpose. The purpose of this study was to compare the effect of 3 fiber-reinforced composite post systems on the fracture resistance and mode of failure of endodontically treated teeth.Material and methods. Ninety maxillary central incisors were divided into 8 experimental groups and I stainless steel (ParaPost) control group of 10 specimens each. Eighty teeth were assigned to 2 main experimental groups called "narrow" and "flared" canals. For the narrow canal group, post spaces were prepared with the corresponding reamer to restore the teeth with FibreKor, Luscent anchors, and Ribbond posts of 1.5 mm, 1.6 mm, and 2.0 mm in diameter, respectively. For the flared canals group thin-walled canals were simulated. Teeth for the flared canals were restored with the same posts but were cemented into tapered 2 mm wide canals created with a tapered diamond bur. Prefabricated posts (FibreKor and Luscent anchors) for narrow and flared canals were cemented with an autopolymerized resin cement and a flowable composite, respectively, whereas customized Ribbond posts were luted with a light-polymerized flowable composite for both canal types. An additional set of 20 Ribbond posts with coronal portions of variable size and shape referred to as "Ribbond nonstandardized" were also prepared and evaluated. Specimens were loaded to failure (kg) with a universal testing machine at a crosshead speed of 0.05 cm/min until failure occurred. Data were analyzed with analysis of variance and Student t tests (P