FREE AND STUDY GAMES ABOUT HISTO 28 - CEMENTUM

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FREE AND STUDY GAMES ABOUT HISTO 28 - CEMENTUM

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -21 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Why are reversal lines scalloped but arrest lines smooth?

Answer:

Reversal lines indicate the activity of individual cementoclasts whereas arrest lines indicate a pause in the wave-like, regular deposition of cementum.

Question 2: What is secondary cementum?

Answer:

Cementum formed after the tooth reaches functional occlusion. This cementum contains trapped cementocytes and is referred to as cellular cementum.Question 3: The inner cortical plate of alveolar bone is referred to as cribiform. What does this mean and what is its function?

Answer:

Cribiform refers to having openings or pores within it. These openings allow nerves and blood vessels to gain access to the periodontal ligament from the alveolar bone plates.

Question 4: What is alveolar bone compared to basal bone?

Answer:

Alveolar bone is the region of the jaw in which the bony tooth sockets are located. Basal bone is more compact and forms the structural portion of the jaw.

Question 5: What inserts into the cementum layer from the PDL aspect?

Answer:

Sharpey's fibers (groups of collagen fibers)

Question 6: Where is the cementum layer thinnest?

Answer:

At the cervix and the upper 1/3 (cervical portion) of the root.Question 7: How does the bone of the bony tooth socket respond to physical pressure?

Answer:

Pressure against bone of the tooth socket causes resoption, tension on the bone (taut PDL) causes deposition.Question 8: What is the clinical implication of these configurations found at the CEJ?

Answer:

Gapping leaves dentin exposed and can lead to radicular dentin caries.Question 9: What happens to these cementoid-secreting cells when the matrix mineralizes?

Answer:

Some become trapped within the mineralized cementoid (cementum) as cementocytes.

Question 10: What is a cementicle?

Answer:

Mineralized bodies within the periodontal ligament - mineralized remnants of the epithelial root sheath (epithelial rests).

Question 11: How is alveolar bone composed?

Answer:

The inner and outer cortical plates of alveolar bone are compact bone. The cortical plate of the tooth socket is cribiform and is composed of an outer layer of bundle bone overlying an inner layer of compact lamellar bone.

Question 12: What is primary cementum and where is it located?

Answer:

Primary cementum is acellular and covers cervical 1/3 of the root.

Question 13: What is a reversal line?

Answer:

A line indicating where the resorption of cementum stopped prior to deposition of new cementum. This is more common in bone. Reversal lines are scalloped in appearance.Question 14: How does the interdental septum differ from the intraradicular septum?

Answer:

The interdental spetum separates individual teeth whereas the interradicular septum separates roots of the same (mutli-rooted) tooth Question 15: What field of dentistry makes use of pressure on the teeth to alter position in the bone?

Answer:

Orthodontic

Question 16: What cells secrete cementum?

Answer:

Cementoblasts.Question 17: Name three patterns exhibited at the Cementum-enamel junction (CEJ) and their frequency of occurence.

Answer:

Touching (25%) Gapping (10%) and Overlapping (65%)

Question 18: What is an arrest line?

Answer:

A highly mineralized layer of cementum marking a pause in the deposition of cementum. They are smooth in appearance.

Question 19: What initiates cementum formation?

Answer:

Breakdown of the epithelial root sheath so that cells of the dental sac touch exposed dentin.

Question 20: What is the interdental septum?

Answer:

The plates of cribiform bone between two adjacent teeth.

Question 21: What is the function of the cementoclast?

Answer:

To resorb cementum.