Ulusoy Ö I, Paltun Y N, Güven N, Çelik B
Department of Endodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Department of Statistics, Faculty of Science, Gazi University, Ankara, Turkey.
Int Endod J. 2016 Dec;49(12):1188-1193. doi: 10.1111/iej.12573. Epub 2015 Nov 28.
To evaluate the dislodgement resistance of DiaRoot BioAggregate and Biodentine from canals in roots with varying amounts of remaining dentine thickness.
A total of 90 maxillary incisor teeth with similar dimensions were used. The teeth were extracted for periodontal reasons from adult subjects aged between 52 and 61 years. They were decoronated at the cemento-enamel junction. Simulated internal cavities with a depth of 3 mm were performed by widening the canals on the coronal thirds of the roots, leaving varying amounts of remaining dentine thickness. The canals were enlarged progressively using round diamond burs until the desired dentine wall thickness was obtained. The samples were divided into three main groups (n = 30 each) according to the dentine thickness as follows: group 1: dentine thickness of 0.75 mm, group 2: dentine thickness of 1.50 mm and group 3: dentine thickness of 2.25 mm. Then, these main groups were further divided into two subgroups (n = 15 each) according to the filling material (DiaRoot BioAggregate or Biodentine). Horizontal root slices of 1 mm were obtained from each specimen. Vertical loading was applied to the filling materials at a cross-head speed of 1 mm min using a universal testing machine. The force that led to dislodgement of the filling was recorded in Newtons. The resistance to dislodgement was calculated in megapascals (MPa) by dividing the load in Newtons by the area of the bonded interface. The data were statistically analysed with two-way anova with Tukey's honestly significant difference (HSD) test.
Biodentine had significantly higher resistance to dislodgement than DiaRoot BioAggregate (P < 0.001). The specimens with thinner remaining dentine had lower dislodgement resistance compared to those with dentine thicknesses of 1.50 and 2.25 mm (P < 0.001). The lowest mean value for dislodgement resistance was obtained from the DiaRoot BioAggregate group with 0.75 mm dentine thickness (2.72 ± 0.90 MPa).
The dislodgement resistance of Biodentine and DiaRoot BioAggregate from root dentine was influenced by remaining dentine thickness, which determines dentinal tubular density.
评估DiaRoot生物活性玻璃离子水门汀和Biodentine在剩余牙本质厚度不同的根管中的抗脱位性。
共使用90颗尺寸相似的上颌切牙。这些牙齿因牙周原因从年龄在52至61岁的成年受试者中拔除。在牙骨质-釉质界处去除牙冠。通过扩大牙根冠三分之一处的根管来模拟深度为3 mm的内部腔隙，使剩余牙本质厚度不同。使用圆形金刚砂车针逐渐扩大根管，直至获得所需的牙本质壁厚度。根据牙本质厚度将样本分为三个主要组（每组n = 30），如下：第1组：牙本质厚度为0.75 mm，第2组：牙本质厚度为1.50 mm，第3组：牙本质厚度为2.25 mm。然后，根据填充材料（DiaRoot生物活性玻璃离子水门汀或Biodentine）将这些主要组进一步分为两个亚组（每组n = 15）。从每个标本获取1 mm厚的水平根切片。使用万能试验机以1 mm/min的十字头速度对填充材料施加垂直载荷。记录导致填充物脱位的力，单位为牛顿。通过将牛顿载荷除以粘结界面面积来计算抗脱位力，单位为兆帕（MPa）。数据采用双向方差分析和Tukey真实显著性差异（HSD）检验进行统计学分析。
Biodentine的抗脱位性显著高于DiaRoot生物活性玻璃离子水门汀（P < 0.001）。与牙本质厚度为1.50和2.25 mm的标本相比，剩余牙本质较薄的标本抗脱位性较低（P < 0.001）。抗脱位性的最低平均值出现在牙本质厚度为0.75 mm的DiaRoot生物活性玻璃离子水门汀组（2.72 ± 0.90 MPa）。
Biodentine和DiaRoot生物活性玻璃离子水门汀从牙根牙本质的抗脱位性受剩余牙本质厚度影响，剩余牙本质厚度决定牙本质小管密度。
