Pulp Protection In Operative Dentistry Question And Answers

Pulp Protection Important Notes

1. Methods of pulp protection

2. Effect of remaining dentinal thickness on pulp

3. Classification of pulp protective agents

• Cavity sealers
  • Varnishes
  • Resin bonding agents
• Cavity liners
  • Calcium hydroxide
  • GIC
• Cavity bases
  • Zinc phosphate
  • Zinc polycarboxylate
  • GIC

4. MTA (Mineral trioxide aggregate)

• It was developed by Torabinejad et al in 1993
• Used as a direct pulp capping agent
• Composed of tricalcium silicate, dicalcium silicate and traces of magnesium oxide, sodium sulphate and potas¬sium sulphate
• Bismuth oxide is added for radiopacity

Pulp Protection Short Essays

Question 1. Management of shallow and deep carious.

Answer:

Management of shallow and deep carious:

1. Shallow Caries:

Excavation of caries
↓
Application of liner over the axial and pulpal wall
↓
Placement of base
↓
Permanent restoration

2. Deep Caries:

Indirect Pulp Capping:

Direct Pulp Capping:

Question 2. Methods of protecting the pulp.

Answer:

Methods of protecting the pulp:

Depends on the use of restorative material and the depth of the cavity

Question 3. Zinc Phosphate.

Answer:

Zinc Phosphate:

High strength base

Composition

• Powder 
  • Zinc oxide – 90.2%
  • Magnesium oxide – 8.2% Water – 36%
  • Other oxides – 0.2%
  • Silica – 1.4%
• Liquid
  • Phosphoric acid – 38.5%
  • Aluminium phosphate – 16.2%
  • Aluminium – 2.5%
  • Zinc – 7.1%

Manipulation:

• Powder/liquid ratio – 1.4 g/0.5 ml
• Dispense on a cool dry glass slab
• Mix using a stainless steel cement spatula in a circular motion
• Mixing time: Each increment – 15-20 sec, total – 1 min.

Uses:

• Luting cement, bases
• Intermediate restorations, root canal restorations

Read And Learn More: Operative Dentistry Short And Long Essay Question And Answers

Question 4. Cement Bases.

Answer:

Cement Bases:

A layer of cement placed beneath permanent restoration

Types:

1. High strength – Thermal protection
2. Low strength – Chemical protection

Properties:

• Thermal fracture or distortion

Examples:

• Zinc phosphate
• GIC
• Calcium hydroxide

Pulp Protection Short Answers

Question 1. Varnish.
(or)
Give composition and objectives of varnishes.

Answer:

Varnish:

• It is an organic copal or resin gum suspended in solutions of ether or chloroform

Composition

• Solid- Copal resin
• Solvent- Ether, acetone, alcohol

Action:

• On application, it evaporates leaving behind a protective Film

Advantages:

• Improves sealing ability of amalgam
• Reduces post-operative sensitivity
• Prevents discolouration of tooth

Indications:

• Pulpal protection
• Sealing of dentinal tubules
• Reduces microleakage
• Protects tooth from chemical irritants

Contraindications:

• Under composite resin
• UnderGIC

Question 3. Liners.

Answer:

Liners:

• Liners are fluid materials that adapt more readily to all aspects of a tooth
• Creates uniform, even surface
• Aids in the adaptation of materials such as amalgam
• Has poor strength so cannot be used alone

Indications:

• Pulpal protection
• Formation of reparative dentin

Materials Used:

• ZOE
• Calcium hydroxide
• Flowable composites
• GIC

Pulp Protection Viva Voce

1. GV Black simply classified cavities as one class of pit and fissure and four classes of smooth surface caries
2. Cavities that occur exclusively in posterior teeth are class 2 cavities
3. Cavities that occur both in anterior and posterior teeth are class 1 and 6
4. A cavity preparation which includes both internal and external cavity walls is termed intracoronal preparation
5. Enameloplasty is indicated when fissure depth is not more than l/3rd the thickness of enamel
6. The class 5 cavity preparation is convex mesiodistally
7. Cavities of the cusp tips of posterior teeth are class 6 cavities
8. The axial wall is the base of class 3 preparation.