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Related Concept Videos

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Quantification of the tug-back by measuring the pulling force and micro computed tomographic evaluation.

Su-Jin Jeon1, Young-Mi Moon1, Min-Seock Seo1

  • 1Department of Conservative Dentistry, Wonkwang University Daejeon Dental Hospital, Daejeon, Korea.

Restorative Dentistry & Endodontics
|November 17, 2017
PubMed
Summary

This study quantifies tug-back during root canal preparation, finding a strong correlation between tug-back force and gutta-percha cone adaptation. This objective measurement aids in assessing master cone fit for better root canal treatment outcomes.

Keywords:
Gutta-perchaMicrocomputed tomographyPulling forceRoot canal obturationTug-back

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Tug-back is a subjective clinical assessment of master cone fit in root canal preparation.
  • Quantifying tug-back objectively is crucial for improving endodontic treatment predictability.
  • Micro-computed tomography (µCT) offers high-resolution imaging for evaluating material adaptation within root canals.

Purpose of the Study:

  • To quantify the pulling force associated with clinical tug-back during root canal preparation.
  • To investigate the correlation between measured tug-back pulling force and the in vitro adaptation of gutta-percha (GP) cones using µCT.
  • To compare tug-back measurements and GP cone adaptation between ProTaper Next (PTN) and ProFile (PF) instrumentation systems.

Main Methods:

  • Human single-rooted teeth (n=28) were instrumented using either PTN or PF systems.
  • Tug-back was assessed using taper-matched GP cones and quantified via a novel spring balance measurement of pulling force.
  • In vitro gutta-percha cone adaptation was evaluated using µCT, determining the percentage of the gutta-percha occupied area (pGPOA) in the apical 3 mm.

Main Results:

  • A positive correlation was observed between tug-back score, pulling force, and pGPOA.
  • Specimens with strong tug-back exhibited a mean pulling force of 1.24 N.
  • Higher tug-back scores and pulling forces correlated significantly with increased pGPOA, irrespective of the instrumentation group (p < 0.05).

Conclusions:

  • Subjective tug-back is a significant indicator of master cone adaptation in root canals.
  • The developed tug-back scoring system and pulling force measurement provide an objective and quantitative method for assessing tug-back.
  • This quantitative approach enhances the interpretation of clinical tug-back for improved endodontic procedures.