📌 POINTS TO PONDER

🔸Acellular extrinsic fiber cementum type of cementum is desired following regenerative periodontal surgical procedure.

🔸Both acellular cementum and cellular cementum are arranged in lamellae separated by incremental lines parallel to the long axis of the root. These lines represent rest periods in cementum formation.

📌 MULTIPLE CHOICE QUESTIONS (MCQs)

💡Cementum was first demonstrated microscopically by:

A. Two pupils of Purkinje in 1835

B. Two pupils of Purkinje in 1935

C. William Sharpey

D. None of the above

Answer : A 

💡The most common presentation of CEJ is:

A. Butt-joint

B. Failing to meet each other

C. Enamel overlaps cementum

D. Cementum overlaps enamel

Answer : D

💡Which of the following is more mineralized?

A. Acellular extrinsic fiber cementum

B. Cellular mixed stratified cementum

C. Cellular intrinsic fiber cementum

D. Intermediate cementum

Answer : A 

💡Adhesion molecule present in cementum:

A. Cementum attachment protein

B. Vascular adhesion molecule

C. Insulin growth factor

D. None of the above

Answer : A

💡 Cementum that usually fills resorption lacunae:

A. Cellular intrinsic fiber cementum

B. Intermediate cementum

C. Acellular extrinsic fiber cementum

D. None of the above

Answer : A

💡 The following are true about cementicles:

A. Calcified round or ovoid bodies

B. Usually seen in the periodontal ligament near the cemental surface

C. Both A and B

D. None of the above

Answer : C

💡 Mineral regulatory protein present in cementum:

A. Osteopontin 

B. Bone sialoprotein

C. Osteocalcin 

D. None of the above

Answer : C

📌 VIVA VOCE

Q1. Who first demonstrated cementum microscopically?

Ans. Two pupils of Purkinje first demonstrated cementum microscopically in 1835.

Q2. Which types of collagen are present in cementum?

Ans. Collagen type I (90%), III, V, XII (FACIT), XIV are present in cementum.

Q3. What are the sources of collagen fibers of cementum?

Ans. The sources of collagen fibers of cementum are:

• Fibroblasts which produce extrinsic Sharpey’s fibers.

• Cementoblasts which produce intrinsic fibers of the cementum matrix.

Q4. Which type of cementum is desired following regenerative periodontal surgical procedure?

Ans. Acellular extrinsic fiber cementum (AEFC) is desired following regenerative periodontal surgical procedure.

Q5. Which is the mineral regulatory protein present in cementum?

Ans. Osteocalcin is the mineral regulatory protein present in cementum.

Q 6. What kind of cementum is present in resorption areas?

Ans. Cellular intrinsic fiber cementum (CIFC).

Q 7. Which disease shows hypercementosis of the entire dentition?

Ans. Paget’s disease.

Q 8. What is intermediate cementum?

Ans. It is an ill defined zone near the cemento dentinal junction of certain teeth.

Q 9. Which cementum covers the cervical third of the root?

Ans. Acellular cementum.

Q 10. What are cervical enamel projections?

Ans. These are the extensions of enamel from the CEJ onto the root surface.