Podcast
Questions and Answers
Which substance makes up the majority of the enamel rod?
Which substance makes up the majority of the enamel rod?
- Inorganic material (correct)
- Rod sheath
- Inter-rod substance
- Organic material
In which direction does the enamel rod run in relation to the dentin surface?
In which direction does the enamel rod run in relation to the dentin surface?
- Curved
- Parallel
- Perpendicular (correct)
- Diagonal
How many enamel rods are present in the upper first permanent molar?
How many enamel rods are present in the upper first permanent molar?
- 15 million
- 12 million (correct)
- 8 million
- 5 million
What is the course of the enamel rod at the incisal edge or cusp tip called?
What is the course of the enamel rod at the incisal edge or cusp tip called?
What is the diameter of the enamel rod primarily composed of?
What is the diameter of the enamel rod primarily composed of?
What is the primary role of the dental papilla in tooth development?
What is the primary role of the dental papilla in tooth development?
What is the main component of the dental sac in tooth germ development?
What is the main component of the dental sac in tooth germ development?
Which structure encircles both the enamel organ and the dental papilla during tooth development?
Which structure encircles both the enamel organ and the dental papilla during tooth development?
What is the consequence of a smaller dental placode than normal during tooth development?
What is the consequence of a smaller dental placode than normal during tooth development?
What occurs due to a change in the orientation of mitotic spindle and cleavage plane of dividing cells during tooth development?
What occurs due to a change in the orientation of mitotic spindle and cleavage plane of dividing cells during tooth development?
Which term describes the process of transformation of lipophilic drugs into more polar (hydrophilic) ready for excretion?
Which term describes the process of transformation of lipophilic drugs into more polar (hydrophilic) ready for excretion?
What determines the intensity of drug response in the body?
What determines the intensity of drug response in the body?
Which term describes the process of transfer of a drug from its site of administration to systemic circulation?
Which term describes the process of transfer of a drug from its site of administration to systemic circulation?
What is the science which deals with the study of drugs and their action on biological systems?
What is the science which deals with the study of drugs and their action on biological systems?
What is the process that describes what the drug does to the body, including biochemical and physiological effects and mechanisms of action?
What is the process that describes what the drug does to the body, including biochemical and physiological effects and mechanisms of action?
Study Notes
Enamel Structure and Properties
- Covers the anatomical crown of a human tooth
- Does not contain collagen
Physical Properties of Enamel
-
Colour: Yellowish white to grayish white, depending on:
- Degree of calcification
- Homogenity of enamel
- Translucency (yellowish teeth) or opacity (grayish teeth)
-
Thickness:
- 2-2.5 mm at the cusps of molars and premolars
- Thins down to almost a knife edge at the cervical margin of the tooth
-
Hardness:
- Hardest calcified tissue in the body
- Microhardness: greatest at the surface, decreasing towards the dentin-enamel junction (DEJ)
- Greater at the cusps and incisal ridge, decreasing towards the cervical line
-
Brittleness:
- Structure and hardness make it brittle, especially when it loses its elastic foundation of healthy dentin
-
Permeability:
- Acts as a semipermeable membrane for certain ions and dyestuffs of small molecular size
- Pores between crystals allow for exchange of substances, primarily from saliva to the outer enamel layer, and less from the pulp to the inner enamel layer across the dentin
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Description
Test your knowledge of enamel in oral biology with this quiz. Learn about the anatomical coverage, composition, and physical properties of enamel, including color, thickness, hardness, brittleness, and permeability.
