Pulpal Therapy

Question 1

What thickness dose the remaining dentin thickness (RDT) have to be for actual odontoblasts to secrete reactionary dentin? What do odontoblast-like cells secrete?

Answer 1

> 0.5mm
If RDT is <0.5 differentiation of odontoblast-like cells happens and they secrete reparative dentin rather than reactionary dentin.

Question 2

What is the difference between reactionary dentin and reparative dentin?

Answer 2

Reactionary dentin is secreted by odontoblast and happens if remaining dentin thickness is >0.5mm.
Reparative dentin is secreted by odontoblast-like cells and happens if remaining dentin thickness is <0.5mm

Question 3

These are the most frequent cell type in the pulp and are capable of generating odontoblast-like cells.

Answer 3

Fibroblasts

*Many are undifferentiated (stem cells)

Question 4

There are type of nerve fibers found in teeth that are thin, non-myelinated nerves involved in dull aching pain.

Answer 4

C-fibers.

A-fibers are myelinated nerves that conduct rapid and sharp pain sensations.

Question 5

What is the recommended posterior bitewing interval for a child in primary or transitional dentition who present for a recall exam who has NO clinical caries and is not at increased risk for caries?

Answer 5

Posterior bitewing exam at 12-24 months intervals if proximal surfaces cannot be examined visually or with a probe.

If they have clinical caries or are at an increased risk for caries 6-12 months is recommended.

Question 6

Why in primary teeth do we see radiolucency in the furcation rather than the apex of the root like permanent teeth?

Answer 6

It is due to extra foramina near the furcation of primary teeth.

Question 7

Periapical radiolucencies can only be seen radiographically after the cortical bone at the apex is destroyed and the infection has spread into ___________ bone.

Answer 7

cancellous

Question 8

What are three pulpectomy indications with a primary tooth?

Answer 8

• Irreversible pulpitis or necrosis
• No root resorption
• Restorable tooth

Question 9

What are the three antibiotics used in lesion sterilization and tissue repair (LSTR)? What are the ratios of each?

Answer 9

Ciprofloxacin, Metronidazole, Minocycline

(1:3:3) ratio.

Question 10

Periapical bone regeneration usually occurs at a rate of ____mm per month.

Answer 10

1.2mm per month.

Question 11

Mouthguards;
Type I=
Type II=
Type III=

Answer 11

Type I= Custom
Type II=Mouth-formed
Type III=Stock

Question 12

A mouth guard should be how many mm thick to provide enough cushion and distribute shock from impact?

Answer 12

3mm

Question 13

What is the exposure for a soft tissue radiograph?

Answer 13

1/4 exposure