periodentine 1

What percentage of cementum is mineral?

50-60%

30-40%

45-50% (correct)

20-30%

What is unique about the development of the periodontal tissues?

They develop from the gum

They develop from the jaw

They do not develop at all

They develop from the teeth (correct)

What is the function of the periodontal ligament (PDL)?

To support and anchor the tooth in the jaw (correct)

To produce saliva

To aid in the development of the jaw

To aid in the development of the tooth

What is the composition of cementum?

45-50% hydroxyapatite, 50-55% collagen Signup and view all the answers

What is the color of cementum?

Yellowish Signup and view all the answers

What is a characteristic of cementum?

It is avascular Signup and view all the answers

What part of the tooth root is primarily covered by acellular cementum?

Cervical 2/3 or more Signup and view all the answers

What is the primary function of acellular cementum in humans?

To provide the site of attachment for the fibers of the periodontal ligament Signup and view all the answers

What type of fibers are found in acellular cementum?

Sharpey's fibers Signup and view all the answers

What is the characteristic of acellular cementum in ground thin sections?

Thin and clear Signup and view all the answers

What is the rate of deposition of acellular cementum?

Slow and continuous throughout life Signup and view all the answers

What is the location of cellular cementum on the tooth root?

Apical 1/3 Signup and view all the answers

What is the main function of acellular cementum?

To anchor a tooth into its socket Signup and view all the answers

What type of fibers are contained in Acellular Extrinsic Fiber Cementum?

Sharpey's fiber bundles from the periodontal ligament Signup and view all the answers

What percentage of people have Acellular Afibrillar Cementum at the cervical margin?

10% Signup and view all the answers

What is the main difference between acellular and cellular cementum?

Cellular cementum is deposited more rapidly Signup and view all the answers

When does cellular cementum begin to form?

After half of the tooth root has begun to form Signup and view all the answers

Which type of teeth may not have cellular cementum?

Incisors and canines Signup and view all the answers

Who named the tissue 'cement' due to its 'cementing' function in elephant molars?

Georges Cuvier Signup and view all the answers

In what century were teeth thought to be made only of two tissues?

1700-1800 Signup and view all the answers

Who discovered cementum in other animals, showing it coats tooth roots in humans and other mammals?

Sir Richard Owen Signup and view all the answers

What is the main function of cementum according to Georges Cuvier?

Holding plate-like cusps together Signup and view all the answers

When was cementum discovered in human teeth?

Not mentioned Signup and view all the answers

What are the two main types of cementum?

Acellular and cellular Signup and view all the answers

What is the primary function of cellular cementum?

To adapt to the changing environment of the tooth socket Signup and view all the answers

What is the characteristic of the canaliculi of cementocytes?

They are mostly pointing towards the outer surface of the cementum Signup and view all the answers

What can be found in the spaces within the cementum?

Cementocytes Signup and view all the answers

What can change over time in cellular cementum?

All of the above Signup and view all the answers

What is the minor role of cellular cementum?

To facilitate the attachment and re-attachment of the PDL fiber bundles Signup and view all the answers

What can be found in cellular cementum?

Both acellular and cellular regions Signup and view all the answers