Allabban Mahmoud N M, Youssef Salah A, Nejri Ali Abkar Mohammed, Qudaih Mohamed A A
Department of Restorative Dental Sciences, AlFarabi Private College for Dentistry and Nursing, Jeddah, Kingdom of Saudi Arabia.
Fixed Prosthodontic Department, Faculty of Dental Medicine, Al-Azhar University, Assiute Branch, Egypt.
Open Access Maced J Med Sci. 2019 Jun 30;7(13):2167-2172. doi: 10.3889/oamjms.2019.580. eCollection 2019 Jul 15.
This study aimed to evaluate the bond strength between esthetic posts and dentin at different regions of the root canal in passive mode or push-out active mode.
Twenty extracted human bicuspid single canal teeth were used in this study. Teeth were sectioned below the cement-enamel junction. The roots of teeth were endodontically treated. Glass fibre posts (Glassix plus, Harald Nordin SA, Switzerland) and zirconia posts (Zirix, Harald Nordin) were then adhesively luted with total-etch (Variolink N, Ivoclar Vivadent, Schaan, Liechtenstein) and self-adhesive (Multilink Speed, Ivoclar Vivadent) resin cement. The roots were divided into two main groups of 10 samples each, according to the type of post used. Each group subdivided into 2 subgroups of 5 samples each, according to the type of cement used. The specimens were transversally sectioned into three slices of 2 mm thickness to perform the push-out test. The push-out tests were performed at crosshead-speed, 0.5 mm/min). Failure modes were evaluated using a scanning electron microscope at magnification (x 150).
The results revealed that push-out bond strengths were significantly affected by the type of luting agent and the type of post (P ≤ 0 .05). The mean push-out bond strength values for fibre post were significantly higher than those for zirconia post independent of the luting strategy used. The score values of total-etch adhesive resin cement were higher than those for self-adhesive resin cement irrespective of other variables. Regarding the effect of the root segment on push-out bond strength, results revealed that bond strength decreased from the coronal to the apical section. The cement-dentin interface found to be the weakest part of the root-cement-post unit.
Glass fibre posts revealed better results in all root third when they adhesively luted with total-etch or self-etch adhesive resin cement and provided significantly increased bond strength compared to the zirconia posts.
本研究旨在评估美观桩与根管不同区域牙本质在被动模式或推出式主动模式下的粘结强度。
本研究使用了20颗拔除的人类双尖单根管牙。在牙骨质-釉质界下方将牙齿进行切片。对牙根进行根管治疗。然后用全蚀刻（Variolink N，义获嘉伟瓦登特公司，列支敦士登沙恩）和自粘结（Multilink Speed，义获嘉伟瓦登特公司）树脂水门汀将玻璃纤维桩（Glassix plus，瑞士哈拉尔德·诺丁公司）和氧化锆桩（Zirix，哈拉尔德·诺丁公司）粘结就位。根据所使用桩的类型，将牙根分为两个主要组，每组10个样本。根据所使用水门汀的类型，每组再细分为两个亚组，每组5个样本。将标本横向切成三片，每片厚度为2毫米，以进行推出试验。推出试验以0.5毫米/分钟的十字头速度进行。使用扫描电子显微镜在放大倍数为150倍下评估失效模式。
结果显示，推出粘结强度受粘结剂类型和桩类型的显著影响（P≤0.05）。无论采用何种粘结策略，纤维桩的平均推出粘结强度值均显著高于氧化锆桩。无论其他变量如何，全蚀刻粘结树脂水门汀的评分值均高于自粘结树脂水门汀。关于牙根段对推出粘结强度的影响，结果显示粘结强度从冠部到根尖部逐渐降低。发现牙骨质-牙本质界面是牙根-牙骨质-桩单元中最薄弱的部分。
当用全蚀刻或自蚀刻粘结树脂水门汀粘结时，玻璃纤维桩在所有牙根三分部均显示出更好的结果，并且与氧化锆桩相比，粘结强度显著提高。
