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Related Concept Videos

Assessment of the Mouth01:26

Assessment of the Mouth

A thorough mouth assessment, including inspection and palpation of the lips, gums, tongue, tonsils, uvula, and pharynx, is crucial in detecting potential health issues. Diseases ranging from oral cancer to systemic conditions like diabetes could be identified early through careful oral examination. This article provides a detailed guide on conducting a comprehensive mouth assessment.
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it to...
Porosity in Cement Paste01:18

Porosity in Cement Paste

The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...
Impact Strength of Concrete01:21

Impact Strength of Concrete

Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it does not...
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...
Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...

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Updated: Jun 21, 2026

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision
07:57

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision

Published on: April 29, 2014

[Clinical evaluation of indirect post core by two different impression methods].

Si-Hua Yu1, Li-Wei Zeng, Hui Wang

  • 1Dept. of Prosthodontics, Stomatological Hospital Affiliated to Nanchang University, Nanchang 330006, China.

Hua Xi Kou Qiang Yi Xue Za Zhi = Huaxi Kouqiang Yixue Zazhi = West China Journal of Stomatology
|July 30, 2009
PubMed
Summary

Silicone rubber impressions yield superior results for indirect cast post core fabrication compared to agar/alginate methods. This difference was particularly noted in premolars and molars, enhancing clinical outcomes.

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision
07:57

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Area of Science:

  • Restorative Dentistry
  • Dental Materials Science
  • Prosthodontics

Background:

  • Indirect cast post core restorations are crucial for restoring function in endodontically treated teeth with massive destruction.
  • Accurate impression techniques are fundamental for successful indirect post core fabrication.
  • Evaluating different impression materials is essential for optimizing clinical outcomes in prosthodontics.

Purpose of the Study:

  • To compare the clinical effectiveness of silicone rubber impression material versus an agar/alginate combination impression for indirect cast post core fabrication.
  • To determine if the choice of impression material influences the success rate of indirect post core restorations.

Main Methods:

  • A randomized study involving 389 root canal-treated teeth with significant coronal destruction.
  • Teeth were divided into two groups: Group A (silicone rubber impression) and Group B (agar/alginate combination impression).
  • Indirect post core impressions were made using the assigned material for each group, and clinical effects were evaluated.

Main Results:

  • The silicone rubber impression method demonstrated a significantly higher success rate in fabricating indirect post cores compared to the agar/alginate combination method.
  • A statistically significant difference (P<0.05) in impression success rates was observed between premolars and molars when using the two different impression methods.
  • No significant difference (P>0.05) was found in the success rates for anterior teeth impressions between the silicone rubber and agar/alginate methods.

Conclusions:

  • Silicone rubber impression material is clinically superior to the agar/alginate combination for the fabrication of indirect cast post cores.
  • The choice of impression material significantly impacts the success of indirect post core fabrication, especially for posterior teeth.