Assessment of Vertical Root Fracture Resistance of Endodontically Treated Teeth Instrumented by Single Endodontic Files
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 88
- 试验地点
- 1
- 主要终点
- Vertical Root Fracture Resistance
研究概览
简要总结
The purpose of this study is the assessment of vertical root fracture resistance of roots prepared with three different single endodontic rotary files in extracted human mandibular premolar roots.
详细描述
88 human extracted mandibular premolars will be selected. Teeth will be sectioned below cementoenamel junction to get 13mm from the apex of root. Roots will then be standardized according to buccolingual and mesiodistal widths and will be examined for fracture and craze lines. The roots will then be randomly divided into 3 experimental groups and 1 control group (n=22). Group 1 will be instrumented with Hyflex EDM. Group 2 will be instrumented with F6 Sky Taper. Group 3 will be instrumented with One Shape and Group 4 will be negative control group in which no instrumentation will be done. After performing rotary instrumentation, roots will then be obturated with respective GP and sealer. Samples will then be exposed to vertical load utilizing Universal Testing Machine till fracture occur which will be recorded in Newton(N).
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Factorial
- 主要目的
- Basic Science
- 盲法
- Single (Outcomes Assessor)
入排标准
- 年龄范围
- 25 Years 至 40 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Extracted Human mandibular premolar canals that fulfill the following criteria were used.
- •permanent teeth
- •intact and fully formed apices
- •straight and single rooted canal
- •roots having similar diameter mesiodistally(2-4mm) and buccolingually(4-6mm)
排除标准
- •Roots having following features were excluded;
- •root caries
- •roots with multiple canals
- •previous root canal treatment done
- •signs of calcification, internal and external root resorption
- •fracture lines
- •C-shaped canals
- •Vertical Root Fracture
研究组 & 干预措施
Hyflex EDm
The canals were prepared and shaped with one file (25/~) and finished with 40/.04 using crown down technique. Torque controlled endodontic motor was used with a rotational speed of 500 rpm and torque of 2.5Ncm (25 Nm).
干预措施: Endodontic Root Canal Treatment (Procedure)
F6 SkyTaper
The canals were prepared and shaped with one file (25/~) and finished with 40/.04 using crown down technique. Torque controlled endodontic motor was used with a rotational speed of 500 rpm and torque of 2.5Ncm (25 Nm).
干预措施: Endodontic Root Canal Treatment (Procedure)
One Shape
Canals were prepared and shaped with single rotational file system One Shape with the sequence of Endoflare (12, 0.12), One G (18, 0.03) and One Shape (12.06) connected to endodontic motor with rotational speed of 400rpm and 4 Ncm torque as recommended by manufacturer.
干预措施: Endodontic Root Canal Treatment (Procedure)
Control
In the control group, no endodontic instrumentation and shaping was done in the canals. Only the necrotic pulp tissue was extirpated from the canals with the help of barbed broaches and then the specimens were analyzed for fracture testing.
结局指标
主要结局
Vertical Root Fracture Resistance
时间窗: 5 minutes
The acrylic blocks with the vertically aligned roots were mounted in the Instron testing machine one at a time. 0.5 mm diameter round tip stainless-steel rod was fixed to the upper stage of the universal testing machine (Instron, Canton, MA, USA). The rod was centered over the canal orifice of each root. The universal testing machine (Instron) was adjusted and vertical compressive force was applied at a crosshead speed of 1mm/min. The Instron tester applied a slowly increasing force, at a rate of 1.0 mm per min, until the root fractured. This point was verified by the computer monitoring the Instron testing machine; at the same time the crack was heard, the monitor showed a sharp drop in force. The test was terminated at this point and the force applied was recorded. The maximum amount of force necessary to fracture every sample was recorded in Newton (N).
次要结局
- Crack pattern(2 minutes)
研究者
Urooj Musheer
Principal Investigator
Dow University of Health Sciences