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目的探究Biodentine和MTA对牙本质抗折性能的影响。方法选40颗中华田园犬尖牙,截冠、去除牙骨质并截去根尖,随机等分为5组。分别在根管内充填不同药物,3个月后行力学测试,得到标本3点弯曲强度和弯曲模量。结果各组标本3点弯曲强度分别:(154.77±16.51)MPa;(125.00±15.72)MPa;(140.81±11.99)MPa;(139.26±16.09)MPa;(120.17±14.21)MPa,单因素方差分析,F=6.74(P<0.05)。各组标本弯曲模量分别为:(19.50±1.03)GPa;(9.62±1.34)GPa;(17.08±1.14)GPa;(15.73±2.14)GPa;(7.63±1.11)GPa;单因素方差分析,F=102.94(P<0.05)。Biodentine和MTA对牙本质抗折性能的影响无统计学差异;与阳性对照组相比,Biodentine和MTA并不能提高牙本质抗折性能;与空白对照组和Vitapex相比,Biodentine和MTA能明显增加牙本质抗折性能。结论作为新兴生物性牙本质替代材料,与传统硅酸钙盐材料MTA相比,Biodentine在提高无髓牙牙本质抗折性能方面,并不具备明显优势。
Objective To investigate the effect of Biodentine and MTA on the dentin bending resistance. Methods Forty canine Chinese canine fangs, truncated crowns, removal of cementum and truncation of apical were randomly divided into five groups. The different kinds of drugs were filled in the root canal respectively. Three months later, the mechanical tests were performed, and the 3-point bending strength and flexural modulus of the specimens were obtained. Results The 3-point flexural strength of each group were (154.77 ± 16.51) MPa, (125.00 ± 15.72) MPa, (140.81 ± 11.99) MPa, (139.26 ± 16.09) MPa and (120.17 ± 14.21) MPa, F = 6.74 (P <0.05). The flexural modulus of each group were (19.50 ± 1.03) GPa, (9.62 ± 1.34) GPa, (17.08 ± 1.14) GPa, (15.73 ± 2.14) GPa and (7.63 ± 1.11) GPa, respectively. One-way ANOVA, F = 102.94 (P <0.05). The effect of Biodentine and MTA on dentin bending properties was not statistically different. Compared with the positive control group, Biodentine and MTA did not improve denture bending properties; Biodentine and MTA significantly increased compared with the blank control group and Vitapex Dentin bending properties. Conclusions Biodentine, as a new substitute material for biological dentin, does not have obvious advantages in improving the flexural property of non-myelinated dentin compared with the traditional calcium silicate material MTA.