玷污层及封闭剂对Ultrafil-3D系统根尖封闭的影响

目的:观察有无玷污层及不同类型的封闭剂对Ultrafil-3D系统根管充填封闭性的影响。方法:64颗人离体单、直根管前牙预备后,将其中的60颗分为有玷污层与无玷污层组,各组分别采用3种封闭剂(AH-plus、Roekoseal、CRCS)并以Ultrafil-3D牙胶(Firmset)充填根管,其余4颗作为对照。所有标本在2%亚甲蓝中浸染5d,将牙体近远中向纵劈后,测量染料的线性染色长度。采用SAS6.04软件包进行方差分析及t检验。结果:(1)无论玷污层去除与否,CRCS组的微漏均显著大于AH-plus及Roekoseal组(P<0.05);(2)去除玷污层前后,使用3种封闭剂的染料微漏均无显著差异(P>0.05)。结论:AH-plus及Roekoseal与Ultrafil-3D牙胶联合使用,能增加根管充填的密合性,去除玷污层不能明显减少微漏的发生。

The influence of smear layer and different sealers on apical microleakage of root canals obturated with Ultrafil-3D system

PURPOSE: To evaluate the sealing properties of Ultrafil-3D system with three different root canal sealers in absence or presence of smear layer. METHODS: 64 straight single-root anterior teeth were selected and root canals were instrumented. 60 teeth were divided into two groups with or without smear layer. Each group was then divided into three subgroups, three different sealers (AH-plus, Roekoseal, CRCS) were applied in each subgroup when the root canals were obturated with Ultrafil-3D system (using Firm set gutta-percha). Other 4 teeth were used as control. After dyed in 2% methyl blue for 5 days, all teeth were longitudinally split from mesiodistal surface into two parts. The linear length of dye was measured for apical microleakage. SAS6.04 software was used for statistical analysis. RESULTS: (1) The linear dye penetration was significantly higher in group A (CRCS) compared with that in group B (AH-plus) and in group C (Roekoseal) (P<0.05). (2) Whether the smear layer was absent or present, the apical microleakage had no significant difference when using gutta-percha of Ultrafil-3D system with the same sealer(P>0.05). CONCLUSION: Root-canal obturation with Ultrafil-3D gutta-percha can obtain better sealing ability when AH-plus or Roekoseal is applied as sealer. Removing the smear layer can not significantly reduce the apical microleakage .