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Week 23 > Amalgam-Kaur > Flashcards

Flashcards in Amalgam-Kaur Deck (27)
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1

Amalgam History

  • Metallic restorative material
  • Composed of:
    • Silver
    • tin
    • copper alloy
    • mercury
  • Primary restorative material for >150 years
  • Safe for use in dentistry

2

Amalgam Restorations today

  • Decreased Popularity due to:
    • reduced caries rate and increased esthetic concerns (MAIN)
    • not preferred to due more tooth structure removed
    • enviromental concerns
  • Still a preferred material due to chance of secondary caries under composites
  • Safe Restorative material

3

Types of Amalgam?

  • low copper
  • high copper
  • Admixed
  • Spherical

4

Amalgam Restoration: General Rules

Tooth prep:

  • uniform minimum thickness for strength
  • 90 degree amalgam angle at margin
  • mechanically retained to tooth

 

Not followed-dislodge or fracture

5

Amalgam Indications:

  • Occlusal Factors
    • heavy occlusal functioning
    • Full occlusal coverage
  • Isolation factors:
    • when isolation is an issue
  • Operator ability & commitment factors:
    • prep requirements
    • but restoration is easier

6

Amalgam contraindications:

  • Allergy-alloy components
  • Esthetic area
  • When composite resin offers better sonservation of tooth and equal clinical performance

7

Amalgam Advantages:

  • Ease of use
  • High compressive strength
  • Excellent wear resistance
  • Cost effective
  • User friendly
  • Self sealing
    • corrosion products--> self seal and reduce microleakage

8

Amalgam Disadvantage

  • Non-insulating
  • Non esthetic
  • Less conservative
  • More difficult to prep tooth
  • Initial marginal leakage

9

Preparation mindset

Lesion driven

10

Directinon of Enamel Rods:

  • Thickness of enamel/dentin
  • Size and position of pulp
  • relationship of tooth to supporting tissue

11

Enamel

  • Hardest in the body
  • highly mineralized 
  • mainly composed of hydroxyapatite crystals and water

12

Dentin

  • Tissue that lies between enamel/cementum and pulp of tooth
  • consists of an organic matrix
    • where mineral salts are deposited

13

Cementum

  • Thin layer of calcified tissue
  • covers dentin of the root

14

Hatchet:

1mm edge

15

Different ways of isolation in dentistry?

  • Rubber Dam
  • Retraction cords
  • Cotton rolls/Gauze
  • Celulose wafers
  • Retractors
  • Some drugs (Atropine)
  • High volume excuators and saliva suction

16

330 burr

  • Blade length (Shank)
    • 1.5-1.8 mm
  • Pear shaped
    • helps in retention form
  • Rounded corners
    • resistance form

17

When is amalgam weak?

  • Think sections
  • Sharp angles

18

Cavosurface angle of amalgam preps?

  • 90 degress to allow sufficient bulk of material at margin

19

Amalgam Prep requirements

  • Optimize strenght of restoration
    • bulk material
    • cavosurface margin=90 degress
  • Protect tooth structure:
    • mesial/distal walls divergent 
  • Retentive factorss
    • buccal/lingual walls convergent
  • Depth:
    • 1.5-2mm

20

Purpose of retentive grooves in amalgam prep?

  • Increase retention and resistance
  • Increase fracture resistance
  • Counter proximal displacement

21

Goals of Condensation

  • adapt to prep
  • create dense mass without porosity
  • minimal mercury in final restoration
  • Reduce marginal leakage
  • enhance marginal integrity
  • decreasing corrosion

22

Condensation pressure applied

  • 8-10lbs

23

Rubber dam isolates?

  • Saliva
  • Tongue
  • Mandible
  • Lips and Cheeks
  • Gingival Tissue
  • Buccal and Lingual Vestibule
  • Floor of the mouth
  • Adjacent teeth and restorations
  • Respiratory moisture

24

Rubber dam: How does rubber dam help?

  • Retracting and better access
    • retract soft tissue
    • provide access and visibility
  • Moisture control
    • saliva, blood, cervicular fluid
  • Prevents harm
    • spray, debris, small items

25

Ticker vs Thinner Dams

  • Thicker
    • retracting tissue
    • most resistant to tearing
    • Class V lesions
  • Thin:
    • tight contacts

26

When should we use rubber dam?

Most restorative procedures:

  • quadrant dentistry
  • Teeth with hard preps
  • Teeth that are hard to isolate
  • Difficult patients

27

When should we not use rubber dam?

  • partial erupted anchor teeth
  • Malpositioned teeth
  • latex allergy (latex free available)
  • Severe patient phobias
  • Asthma
  • Mouth Breathers