Anonymous
Nov 16, 2023
Explain physical properties of enamel and dentine respectively?
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Nov 16, 2023
Physical properties of enamel:
1. Hardness: Enamel is the hardest tissue in the human body, making it highly resistant to wear and tear. It has a hardness rating of 5 on the Mohs scale, which is comparable to the hardness of steel.
2. Translucency: Enamel is a translucent material, allowing some light to pass through it. This property gives teeth their natural appearance and allows the underlying dentine to contribute to the tooth color.
3. Brittle: Enamel is a brittle material, meaning it is prone to fracturing or chipping under excessive force or trauma. It lacks the ability to flex or absorb impact, making it susceptible to damage.
4. Insulating: Enamel is a poor conductor of heat and electricity, providing insulation to the underlying dentine and dental pulp. This property helps protect the tooth from temperature changes and sensitivity.
5. Smooth surface: Enamel has a smooth and glossy surface, which aids in maintaining oral hygiene. The smoothness prevents the accumulation of plaque and bacteria, reducing the risk of tooth decay and gum disease.
Physical properties of dentine:
1. Hardness: Dentine is a hard tissue, although not as hard as enamel. It has a hardness rating of 3-4 on the Mohs scale. It provides structural support to the tooth and protects the dental pulp.
2. Yellowish color: Dentine is naturally yellowish in color and contributes to the overall color of the tooth. It is covered by the translucent enamel layer, which can affect the perceived color of the tooth.
3. Elasticity: Unlike enamel, dentine has some degree of elasticity, allowing it to flex and absorb forces during biting and chewing. This property helps prevent the tooth from fracturing under normal functional loads.
4. Sensitivity: Dentine contains tiny channels called dentinal tubules, which connect to the dental pulp. These tubules can transmit sensations, making dentine sensitive to temperature changes, acidic foods, and external stimuli.
5. Porous: Dentine is a porous material, with the dentinal tubules creating a network of microscopic channels. This porosity allows for the exchange of fluids and nutrients between the dental pulp and the surrounding tissues.
1. Hardness: Enamel is the hardest tissue in the human body, making it highly resistant to wear and tear. It has a hardness rating of 5 on the Mohs scale, which is comparable to the hardness of steel.
2. Translucency: Enamel is a translucent material, allowing some light to pass through it. This property gives teeth their natural appearance and allows the underlying dentine to contribute to the tooth color.
3. Brittle: Enamel is a brittle material, meaning it is prone to fracturing or chipping under excessive force or trauma. It lacks the ability to flex or absorb impact, making it susceptible to damage.
4. Insulating: Enamel is a poor conductor of heat and electricity, providing insulation to the underlying dentine and dental pulp. This property helps protect the tooth from temperature changes and sensitivity.
5. Smooth surface: Enamel has a smooth and glossy surface, which aids in maintaining oral hygiene. The smoothness prevents the accumulation of plaque and bacteria, reducing the risk of tooth decay and gum disease.
Physical properties of dentine:
1. Hardness: Dentine is a hard tissue, although not as hard as enamel. It has a hardness rating of 3-4 on the Mohs scale. It provides structural support to the tooth and protects the dental pulp.
2. Yellowish color: Dentine is naturally yellowish in color and contributes to the overall color of the tooth. It is covered by the translucent enamel layer, which can affect the perceived color of the tooth.
3. Elasticity: Unlike enamel, dentine has some degree of elasticity, allowing it to flex and absorb forces during biting and chewing. This property helps prevent the tooth from fracturing under normal functional loads.
4. Sensitivity: Dentine contains tiny channels called dentinal tubules, which connect to the dental pulp. These tubules can transmit sensations, making dentine sensitive to temperature changes, acidic foods, and external stimuli.
5. Porous: Dentine is a porous material, with the dentinal tubules creating a network of microscopic channels. This porosity allows for the exchange of fluids and nutrients between the dental pulp and the surrounding tissues.
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