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01:21Tooth Anatomy
1.5K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
1.5K
01:15Teeth
1.2K
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
1.2K
01:28Types of Non-structural Cracks in Concrete
325
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
325
01:20Microcracking in Concrete
276
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
276
01:23Behavior of Concrete Under Compressive Load
385
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
385
01:16Tensile Strength Considerations of Concrete
288
Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen...
The dimensions and shape of a concrete specimen...
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The importance of endodontics - continuing education at the FGDP (UK).
Primary dental journal·2014
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Facts About Cracks in Teeth.
1Specialist in Endodontics, Senior Lecturer, University of Liverpool Dental School; ENDO61 Specialist practice, Manchester.
Primary Dental Journal
|March 16, 2021
Summary
Understanding tooth fracture mechanics helps in diagnosing and managing dental injuries. This review covers fracture types, identification, and prognosis based on fracture extent.
Area of Science:
- Dental Mechanics
- Oral Biology
- Clinical Dentistry
Background:
- Understanding stress distribution in intact teeth is crucial for comprehending resistance to masticatory forces.
- Accurate identification of tooth fractures is vital for proper diagnosis, especially when the pulp is involved.
Purpose of the Study:
- To discuss the various types of tooth fractures.
- To outline methods for identifying tooth fractures.
- To review the management strategies for tooth fractures.
Main Methods:
- Literature review on tooth biomechanics and fracture analysis.
- Discussion of clinical diagnostic techniques for tooth fractures.
- Analysis of prognostic indicators in tooth fracture management.
Main Results:
- Fracture type, identification, and management are dependent on the fracture's extent within the tooth structure.
- Prognostic indicators are largely determined by the severity and location of the tooth fracture.
Conclusions:
- Effective management of tooth fractures relies on accurate diagnosis and understanding prognostic factors.
- Knowledge of stress distribution aids in predicting tooth resistance and fracture outcomes.