Department of Endodontics, Faculty of Dentistry, Istanbul Aydın University, Istanbul.
Department of Endodontics, Faculty of Dentistry, Akdeniz University, Antalya, Turkey.
Int Endod J. 2018 Jan;51 Suppl 1:e65-e72. doi: 10.1111/iej.12816. Epub 2017 Aug 1.
To determine the effect of photon-initiated photoacoustic streaming (PIPS) on the extrusion of debris using multiple-file (ProTaper Next-PTN) and single-file (One Shape-OS) continuous rotary systems in curved canals in human molar teeth.
Sixty extracted maxillary first molar teeth with curved mesial roots, mature apices and of similar lengths were selected. Teeth having canals with apical diameters larger than size 15 were discarded. The teeth were randomly divided into four experimental groups (n = 15 teeth per group) according to the file used and irrigation systems: (i) OS with PIPS with a 2940 nm Er:YAG laser (0.3 W, 15 Hz, and 20 mJ), (ii) OS with conventional needle irrigation (CNI) with a 27-G needle, (iii) PTN with PIPS and (iv) PTN with CNI. The PIPS and CNI was applied during each file change for 20 s. Total irrigation and activation time was 1 min, and a total volume of 7.5 mL of bidistilled water was used as the irrigant. The apically extruded debris was collected into pre-weighed Eppendorf tubes. The tubes were then stored in an incubator at 70 °C for 5 days. The weight of dry extruded debris was assessed by subtracting the initial weight of the tube from the final weight. The results were analysed statistically using one-way analysis of variance and Tukey's post hoc tests. Bonferroni correction was used to compare the groups.
The PIPS irrigation technique was associated with significantly more debris extrusion than the CNI system (P < 0.05). The single-file (One Shape-OS) rotary system was associated with more debris than the multiple-file (ProTaper Next-PTN) rotary systems when the same irrigation system was used (P > 0.05). The total amount of debris extruded apically by PIPS activation was significantly greater than that by CNI (P < 0.05).
All file and irrigation systems extruded debris apically. PIPS activation was associated with significantly more extrusion debris in curved canals compared with no activation.
确定在人磨牙弯曲根管中，使用多文件（ProTaper Next-PTN）和单文件（One Shape-OS）连续旋转系统，光子引发光声流（PIPS）对碎片挤出的影响。
选择 60 颗具有近中弯曲根、成熟根尖且长度相似的上颌第一磨牙。去除根尖直径大于 15 号的根管的牙齿。根据使用的文件和冲洗系统，将牙齿随机分为四组（每组 15 颗牙）：（i）使用 2940nm Er:YAG 激光（0.3W，15Hz，20mJ）的 OS 与 PIPS，（ii）使用 27-G 针的 OS 与常规针冲洗（CNI），（iii）PTN 与 PIPS，（iv）PTN 与 CNI。在每次换锉时，PIPS 和 CNI 都应用 20 秒。总冲洗和激活时间为 1 分钟，使用 7.5 毫升双蒸水作为冲洗液。根尖挤出的碎片被收集到预先称重的 Eppendorf 管中。然后将管存放在 70°C 的孵育箱中 5 天。通过从初始管重中减去最终管重来评估干燥挤出碎片的重量。使用单向方差分析和 Tukey 事后检验对结果进行统计分析。使用 Bonferroni 校正比较组间差异。
与 CNI 系统相比，PIPS 冲洗技术与更多的碎片挤出有关（P<0.05）。当使用相同的冲洗系统时，与多文件（ProTaper Next-PTN）旋转系统相比，单文件（One Shape-OS）旋转系统与更多的碎片挤出有关（P>0.05）。与 CNI 相比，PIPS 激活后根尖挤出的总碎片量明显更多（P<0.05）。
所有文件和冲洗系统都从根尖挤出碎片。与不激活相比，PIPS 激活与弯曲根管中明显更多的碎片挤出有关。
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