Pin Retained Restoration Question And Answers

Pin Retained Restoration Important Notes

1. Types of pin-retained restorations

2.  Failures of pin retained restorations

• If the failure is within the restoration, the restoration can fracture
• If the failure is at the interface between the pin and the restorative material, the pin can pull out the restorative material
• If the failure is within the pin, the pin can fracture when stressed beyond its ultimate tensile strength
• If the failure is at the interface between the pin and the dentin the pin can pull out the dentin
• Within the dentin, the dentin can fracture

Pin Retained Restoration Short Essays

Question 1. Pin retained restoration.

Answer:

Pin retained restoration:

Definition:

Any restoration that requires the placement of pin/pins in the dentin to provide sufficient retention and resistance from the restoration

Advantages:

• Conserves tooth structure
• Increases resistance and retention
• Economic
• Requires fewer recall visits

Disadvantages:

• Dentin fracture
• Decreased strength of amalgam
• Perforation
• Microleakage

Indications:

• Grossly carious teeth
• Full coverage restoration
• Extended preparation

Contraindications:

• Occlusal problems
• Aesthetic problems

Pins:

• Types- Cemented pin
• Self threaded
• Friction locked pin

Sizes:

• Minuta-0.015″
• Minikin – 0.019″

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• Minim – 0.024”
• Regular-0.031″

Design:

• Standard
• Self shearing
• Two in one
• Link series
• Link plus series

Question 2. Self-threaded pin./Self-threading pin.

Answer:

Self-threaded pin:

• Introduced by Going in 1966
• Size – 0.0015″ – 0.004” larger than pin holes
• Retention – By threads of pins
• The material used – Stainless steel, Titanium

Indications:

• Vital teeth
• Presence of sufficient dentin

Advantages:

• Ease of retention
• Superior retention
• No need for cement media

Disadvantages:

• Pulpal stress
• Dentinal crazing
• Microleakage
• Loosening of pins

Question 3. TMS (Thread mate System).

Answer:

TMS (Thread mate System):

Advantages:

• Variety of design
• Variety of pin sizes
• Good retention
• Color coding
• Gold plated
• Reduced corrosion

Pin Sizes

• Minute-0.015″
• Minikin – 0.019″
• Minim – 0.024”
• Regular-0.031″

Pin Design:

• Standard – 7 mm long, flat head
• Self-shearing – On reaching the bottom of the pinhole, the head separates automatically
• Two in one
• Two pins join each other at a joint
• When the peripheral pin shears off the other pin can be reused for another pin channels
• Link series
• Latch head
• Self shearing type
• Link plus series
  • Sharp threads
  • Tapered tip
  • Shoulder stop

Pin Retained Restoration Short Answers

Question 1. Self-shearing pins.
(or)
Pins in restorative dentistry.
(or)
Types of pins in amalgam restoration.

Answer:

Pins in restorative dentistry:

1. Direct Pins:

2. Indirect Pins:

• Smaller than pin holes
  • Cast gold pins
  • Wrought precious metal pins

Pin Retained Restoration Viva Voce

1. The self-threaded pin is the most retentive
2. Cemented pins are the least retentive pins
3. Pulpal stress is maximal with self-threading pin and least with cemented pin
4. Threaded Mate System (TMS} is the most widely used self-threading pins
5. TMS pins exhibit less microleakage than other pins