Tooth Histology: Structure and Composition

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What is the primary function of enamel in teeth?

To support the structural integrity of the tooth

To aid in the process of chewing and grinding food

To provide a protective cover to vital tissues of dentin and pulp (correct)

To facilitate the exchange of ions within the enamel

What is the chemical composition of enamel primarily made of?

60% inorganic substances and 40% organic content

80% water and 20% organic content

100% inorganic substances (Fluoroapatite)

95 to 98% inorganic substances (Hydroxyapatite) (correct)

What is the physical unit structure present in human enamel?

Dentin tubules

Enamel rod or prisms (correct)

Pulp capillaries

Cementum fibers

What happens when fluorides are incorporated into enamel?

Hydroxyapatite will be converted into fluoroapatite which is more resistant to acids Signup and view all the answers

What role do micropores in enamel play?

Form a dynamic connection between the oral cavity and the dentinal tubule fluids Signup and view all the answers

How much water content forms enamel by weight?

4% Signup and view all the answers

What is the natural color of the enamel in the incisal edge and cusp tips?

Gray or whitish blue Signup and view all the answers

What happens to the color of enamel when the enamel becomes thinner?

The color of the dentine shows through and the enamel appears to be darker Signup and view all the answers

What forms natural cleavage planes through which fracture might occur in enamel?

Enamel rod boundaries Signup and view all the answers

What happens if the underlying dentin support is removed, causing the enamel prisms to weaken?

Undermined enamel occurs Signup and view all the answers

What occurs during acid etching when bonding to resin composite?

The enamel rod boundary and central core are differentially soluble Signup and view all the answers

What provides support for enamel?

Dentin Signup and view all the answers

Which type of dentin is formed before and shortly after eruption, usually completed 3 years after tooth eruption for permanent teeth?

Primary dentin Signup and view all the answers

Which type of dentin is a continuation of primary dentin formed at a slower rate as the tooth ages even without external stimuli?

Secondary dentin Signup and view all the answers

What type of dentin is formed in response to irritation such as abrasion, erosion, attrition, and caries?

Reparative dentin (tertiary dentin) Signup and view all the answers

What theory states that pain is transmitted through movements of fluid within dentinal tubules?

Hydrodynamic theory Signup and view all the answers

What is the chemical composition of enamel primarily made of?

Hydroxyapatite Signup and view all the answers

What is the role of micropores in enamel?

They create a dynamic connection between the oral cavity and the dentinal tubule fluids Signup and view all the answers

What occurs during acid etching when bonding to resin composite?

Fluorides are incorporated into enamel Signup and view all the answers

Which type of dentin is formed before and shortly after eruption, usually completed 3 years after tooth eruption for permanent teeth?

Primary dentin Signup and view all the answers

What happens if the underlying dentin support is removed, causing the enamel prisms to weaken?

Structural integrity of enamel is compromised Signup and view all the answers

What type of dentin is a continuation of primary dentin formed at a slower rate as the tooth ages even without external stimuli?

Secondary dentin Signup and view all the answers

What is the primary function of dentin in teeth?

Provides structural support for the enamel Signup and view all the answers

Which type of dentin is formed as a response to irritation such as abrasion, erosion, attrition, and caries?

Reparative dentin Signup and view all the answers

What theory states that pain is transmitted through movements of fluid within dentinal tubules?

Hydrodynamic theory Signup and view all the answers

What is the natural color of enamel in areas where there is no underlying dentine?

Gray or whitish blue Signup and view all the answers

What happens to the color of enamel as it becomes thinner?

It becomes darker Signup and view all the answers

What chemical composition primarily forms dentin?

75% inorganic material, 20% organic material, and 5% water Signup and view all the answers

What is the role of dentinal tubules in dentin?

Contain the cytoplasmic process of an odontoblast + dentinal fluid Signup and view all the answers

Which type of dentin is laid down particularly on the roof and floor of the pulp chamber as the tooth ages?

Secondary dentin Signup and view all the answers

Tooth Histology: Structure and Composition

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Questions and Answers

What is the primary function of enamel in teeth?

What is the chemical composition of enamel primarily made of?

What is the physical unit structure present in human enamel?

What happens when fluorides are incorporated into enamel?

What role do micropores in enamel play?

How much water content forms enamel by weight?

What is the natural color of the enamel in the incisal edge and cusp tips?

What happens to the color of enamel when the enamel becomes thinner?

What forms natural cleavage planes through which fracture might occur in enamel?

What happens if the underlying dentin support is removed, causing the enamel prisms to weaken?

What occurs during acid etching when bonding to resin composite?

What provides support for enamel?

Which type of dentin is formed before and shortly after eruption, usually completed 3 years after tooth eruption for permanent teeth?

Which type of dentin is a continuation of primary dentin formed at a slower rate as the tooth ages even without external stimuli?

What type of dentin is formed in response to irritation such as abrasion, erosion, attrition, and caries?

What theory states that pain is transmitted through movements of fluid within dentinal tubules?

What is the chemical composition of enamel primarily made of?

What is the role of micropores in enamel?

What occurs during acid etching when bonding to resin composite?

Which type of dentin is formed before and shortly after eruption, usually completed 3 years after tooth eruption for permanent teeth?

What happens if the underlying dentin support is removed, causing the enamel prisms to weaken?

What type of dentin is a continuation of primary dentin formed at a slower rate as the tooth ages even without external stimuli?

What is the primary function of dentin in teeth?

Which type of dentin is formed as a response to irritation such as abrasion, erosion, attrition, and caries?

What theory states that pain is transmitted through movements of fluid within dentinal tubules?

What is the natural color of enamel in areas where there is no underlying dentine?

What happens to the color of enamel as it becomes thinner?

What chemical composition primarily forms dentin?

What is the role of dentinal tubules in dentin?

Which type of dentin is laid down particularly on the roof and floor of the pulp chamber as the tooth ages?

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