Wall shear stress effects of different endodontic irrigation techniques and systems
Wall shear stress effects of different endodontic irrigation techniques and systems
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DOI：
10.1016/j.jdent.2013.04.007
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发表时间：
2013-07-01
影响因子：
4.4
通讯作者：
Tay, Franklin R.
中科院分区：
文献类型：
--
作者：
Goode, Narisa;Khan, Sara;Tay, Franklin R.
目的：本研究探讨清创术的功效，作为一个难以接近的凹进的弯曲根管model.Methods：一个可重复使用的，弯曲的管腔内含有一个模拟的根管翅片的壁面剪切应力的结果被铣削成镜像钛块。使用氢氧化钙（Ca（OH）（2））糊剂作为碎屑，并将其装载到根管翅片中。钛块用螺栓连接在一起以提供不透流体的密封。以先前确定的1 mL/min流速输送次氯酸钠，对于所有检查的技术，该流速可忽略不计或不产生冲洗液挤压到根尖周的压力。检查了9种灌注输送/搅拌技术：Navi-Tip被动冲洗控制，Max-i-Probe（R）侧通气针被动冲洗，使用非拟合和拟合良好的牙胶点进行手动动态搅拌（MDA），使用中等和较大点进行EndoActivator（TM）声波搅拌，VPro（TM）EndoSafe（TM）冲洗系统，VPro（TM）StreamClean（TM）连续超声冲洗和EndoVac心尖负压冲洗。采用Kruskal-Wallis ANOVA和Dunn多重比较检验（α = 0.05）分析清创效果。结果：EndoVac是唯一一种在预定流速下从髓腔翅片中清除99%以上氢氧化钙碎屑的技术。这一组与（p < 0.05），与Ca（OH）（2）去除不完全的其他组相比。EndoVac系统从模型弯曲根管的机械不可接近的凹槽中显著清洁更多碎屑的能力可能是由冲洗液输送过程中的稳健气泡形成引起的，通过两相空气-液体流动现象产生更高的壁剪切应力，这在其它工业清创系统中是公知的。(C)2013爱思唯尔有限公司保留所有权利。
Objectives: This study examined debridement efficacy as a result of wall shear stresses created by different irrigant delivery/agitation techniques in an inaccessible recess of a curved root canal model.Methods: A reusable, curved canal cavity containing a simulated canal fin was milled into mirrored titanium blocks. Calcium hydroxide (Ca(OH)(2)) paste was used as debris and loaded into the canal fin. The titanium blocks were bolted together to provide a fluid-tight seal. Sodium hypochlorite was delivered at a previously-determined flow rate of 1 mL/min that produced either negligible or no irrigant extrusion pressure into the periapex for all the techniques examined. Nine irrigation delivery/agitation techniques were examined: Navi-Tip passive irrigation control, Max-i-Probe (R) side-vented needle passive irrigation, manual dynamic agitation (MDA) using non-fitting and well-fitting gutta-percha points, EndoActivator (TM) sonic agitation with medium and large points, VPro (TM) EndoSafe (TM) irrigation system, VPro (TM) StreamClean (TM) continuous ultrasonic irrigation and EndoVac apical negative pressure irrigation. Debridement efficacies were analysed with Kruskal-Wallis ANOVA and Dunn's multiple comparisons tests (alpha = 0.05).Results: EndoVac was the only technique that removed more than 99% calcium hydroxide debris from the canal fin at the predefined flow rate. This group was significantly different (p < 0.05) from the other groups that exhibited incomplete Ca(OH)(2) removal.Conclusions: The ability of the EndoVac system to significantly clean more debris from a mechanically inaccessible recess of the model curved root canal may be caused by robust bubble formation during irrigant delivery, creating higher wall shear stresses by a two-phase air-liquid flow phenomenon that is well known in other industrial debridement systems. (C) 2013 Elsevier Ltd. All rights reserved.