Vertical Fracture of Root of Tooth (Disorder)
Conditions
Keywords
Hyflex EDM,F6 Sky Taper,One Shape
Brief summary
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.
Detailed description
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).
Interventions
PROCEDUREEndodontic Root Canal Treatment
Root canal shaping procedures were performed. Irrigation was done after each three pecks of endodontic file. After instrumentation (Groups 1-3), the canals were dried with sterile paper points. The dentinal walls were then coated with Sealapex. For vertical root fracture resistance testing, sample preparation was done in acrylic blocks. Then roots were coated with polyvinylsiloxane impression material. After that roots were inserted again into acrylic resin blocks. The acrylic blocks with the vertically aligned roots were mounted in the Instron testing machine. 0.5 mm diameter round tip stainless-steel rod was fixed to the universal testing machine. The universal testing machine was adjusted and vertical compressive force was applied at a crosshead speed of 1mm/min. The Instron tester applied a slowly increasing force, until the root fractured. The maximum amount of force necessary to fracture every sample was recorded in Newton (N).
Sponsors
Dow University of Health Sciences
Study design
Allocation
RANDOMIZED
Intervention model
FACTORIAL
Primary purpose
BASIC_SCIENCE
Masking
SINGLE (Outcomes Assessor)
Intervention model description
Samples were randomly divided in 4 groups. Random sampling was done with computer generated method. There were 3 working groups comprising of 22 canals and 1 negative control group having 22 canals.
Eligibility
Sex/Gender
ALL
Age
25 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* 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)
Exclusion criteria
* 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 * cracks * fracture lines * C-shaped canals * Vertical Root Fracture
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Vertical Root Fracture Resistance | 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). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Crack pattern | 2 minutes | crack pattern is complete/incomplete |
Countries
Pakistan
Outcome results
None listed