Lezaja Maja, Veljovic Djordje, Manojlovic Dragica, Milosevic Milos, Mitrovic Nenad, Janackovic Djordje, Miletic Vesna
University of Belgrade, School of Dental Medicine, DentalNet Research Group, Rankeova 4, Belgrade, Serbia.
University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade, Serbia.
Dent Mater. 2015 Feb;31(2):171-81. doi: 10.1016/j.dental.2014.11.017. Epub 2014 Dec 23.
To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing.
Cylinder-shaped HAP inserts (4mm in diameter, 1.6mm thick) were cemented in dentin discs (5mm×1.6mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (α=0.05).
SBS of restorative materials to HAP inserts ranged between 12.2±2.1MPa (Filtek Z250) and 0.7±0.4MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2±2.1MPa) and Filtek Ultimate flowable (9.5±2.5MPa) compared to the 'self-etch' approach (8.2±1.6MPa and 4.4±0.9MPa, respectively) (p<0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond.
Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.
测定合成可控多孔羟基磷灰石（HAP）植入体与修复材料之间的剪切粘结强度（SBS）以及含植入体修复体在固化过程中的尺寸变化。
将圆柱形HAP植入体（直径4mm，厚1.6mm）粘结于从人类第三磨牙中冠部切取的牙本质片（5mm×1.6mm）中，使用以下材料之一：通用微混合复合材料Filtek Z250、流动复合树脂Filtek Ultimate或玻璃离子水门汀Vitrebond（均为3M ESPE公司产品）。在万能试验机上测试相同材料与HAP植入体之间的SBS。使用三维数字图像相关系统Aramis（GOM公司）测量应变和位移。数据采用单因素方差分析和Tukey事后检验进行统计学分析（α=0.05）。
修复材料与HAP植入体之间的SBS在12.2±2.1MPa（Filtek Z250）至0.7±0.4MPa（无粘结剂的Filtek Z250）之间。与“自酸蚀”方法（分别为8.2±1.6MPa和4.4±0.9MPa）相比，“全酸蚀”粘结剂应用方法显著提高了Filtek Z250（12.2±2.1MPa）和Filtek Ultimate流动复合树脂（9.5±2.5MPa）的SBS（p<0.05）。HAP植入体将聚合收缩率降低至0.5%以下，并减少了修复体中心区域的位移。有无HAP植入体时修复材料的周边收缩情况相似，Filtek Z250和Vitrebond的位移情况也相似。
在临床上替代大部分牙本质，尤其是在大窝洞修复中，HAP植入体可缩短临床操作时间，通过减少中心收缩和位移来提高修复体的尺寸稳定性，并采用“全酸蚀”方法与通用复合材料实现粘结。
