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目的 :探讨机用镍钛ProTaper根管预备附加不同超声冲洗液对根管壁牙本质显微硬度的影响。方法 :收集60颗离体单根管上颌前牙,随机分为6组,A组为对照组,B组应用机用镍钛ProTaper根管预备至F3,C组预备后附加3%过氧化氢溶液超声冲洗1 min,D组预备后附加口泰漱口液超声冲洗1 min,E组预备后附加17%EDTA溶液超声冲洗1 min,F组预备后附加蒸馏水超声冲洗1 min。将每个牙根平均横截为根上、根中和根尖3段,再纵向劈开,用显微硬度仪分别测量各组根管壁显微硬度。采用SPSS 17.0软件包对数据进行统计学分析。结果:A组根管各处的显微硬度分别为(52.66±1.64)HV、(52.08±1.53)HV和(51.47±2.53)HV,差异无显著性(P>0.05),其他各组的根尖1/3显微硬度均低于根颈和根中1/3,差异显著(P<0.05)。在根颈1/3和根中1/3,E组显微硬度分别为(44.65±1.33)HV和(42.55±1.12)HV,与其他各组相比,差异显著(P<0.05)。在根尖1/3,E组显微硬度为(37.82±1.60)HV,下降最为显著,其次为C组,显微硬度为(44.14±1.73)HV。B组、D和F组之间相比,无显著性差异(P>0.05)。结论:机用镍钛ProTaper根管预备至F3可使根尖1/3显微硬度下降。17%EDTA溶液超声冲洗1 min可使根管各部显微硬度下降,3%过氧化氢可使根尖1/3显微硬度下降,口泰漱口液和蒸馏水对根管各部牙本质显微硬度值无明显影响。
Objective: To investigate the effect of mechanical NiTi ProTaper root canal preparation with different ultrasonic irrigation on the dentinal microhardness of root canal. Methods: Sixty single root canal anterior teeth were collected and randomly divided into six groups. Group A was control group. Group B was prepared with machine NiTi ProTaper root canal to prepare F3. Group C was supplemented with 3% hydrogen peroxide Solution ultrasonic rinse for 1 min. Group D was given ultrasonic rinse for 1 min after oral preparation. The group E was rinsed with 17% EDTA solution for 1 min. The group F was treated with distilled water for 1 min. The average root of each root for the root, root and root apical 3, and then longitudinal split, with a microhardness instrument were measured in each group of root canal wall microhardness. Data were statistically analyzed using SPSS 17.0 software package. Results: The microhardness of the root canal in group A was (52.66 ± 1.64) HV, (52.08 ± 1.53) HV and (51.47 ± 2.53) HV respectively, with no significant difference (P> 0.05) The microhardness of tip 1/3 was lower than that of root and root 1/3, the difference was significant (P <0.05). The microhardness of group E was (44.65 ± 1.33) HV and (42.55 ± 1.12) HV respectively, which was significantly different from that of other groups (P <0.05). In the root tip 1/3, the microhardness of group E was (37.82 ± 1.60) HV, the most significant decrease, followed by group C, the microhardness was (44.14 ± 1.73) HV. There was no significant difference between group B, D and F (P> 0.05). Conclusion: The preparation of machine-made NiTi ProTaper root canal to F3 can decrease the microhardness of root tip 1/3. 17% EDTA solution ultrasonic rinse for 1 min can reduce the hardness of the various parts of the root canal, 3% hydrogen peroxide can reduce the root tip 1/3 hardness, mouth and mouth rinse and distilled water on the root canal dentin microscopy Hardness value no significant effect.