Effect of materials in the treatment of endodontic diseases on the dentin’s fracture resistance
YI Si, WU Bu-lin, TANG Lei, XU Wen-an, LI Jian-yi, CHEN Jia-jing, SONG Ying, XU Chu, XU Di-wei
Chinese Journal of Clinical Anatomy ›› 2017, Vol. 35 ›› Issue (2) : 207-210.
Effect of materials in the treatment of endodontic diseases on the dentin’s fracture resistance
Objective To investigate the effect of Biodentine and MTA on the dentin’s fracture resistance. Methods 40 fresh extracted Chinese rural dogs’ canines were collected and randomly divided into 5 groups. The crowns and the cementum of the teeth were dissected. Each tooth was prepared with unity sample at the length of about 25 mm. Five groups’ samples were filled with different medicines. The three-point flexural strength and flexural modulus of the experimental specimens were determined by applying a vertical splitting load through a specially shaped steel rod. The maximum load value of root fracture was tested after three months. Results The average three-point flexural strength of the five groups was sequentially: (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. The average three-point flexural strength of the five groups were in order: (19.50±1.03)GPa ; (9.62±1.34) GPa ; (17.08±1.14)GPa ; (15.73±2.14) GPa ; (15.73±2.14) GPa; (7.63±1.11) GPa. The data were analyzed by one way ANOVA and LSD method (P<0.05). The risk of pulpless root fracture may increase obviously as time goes by. The differences of the effect of Biodentine and MTA on the dentin’s fracture resistance remains no statistically significant. Compared with the positive control group, MTA and Biodentine did not increase or restore the fracture resistance of dentin. But compared with the negative control group and Vitapex, Biodentine and MTA could significantly increase the fracture resistance of dentin. Conclusion As a new biological dentin substitute materials, compared with the traditional calcium silicate material-MTA, Biodentine did not have the obvious advantage in improving the flexural properties of dentine.
Biodentine / MTA / Fracture resistance / Three-point flexural strength / Flexural modulus
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