Past paper questions Flashcards

1
Q

What is the Herbert Schilders endo principles?

A
  • Continuously tapering funnel shape
  • Maintain apical foramen in original position and as small as poss
  • Use correct irrigant and antimicrobial disinfectant to remove debris
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2
Q

Why is irrigant useful?

A
  • Disinfect root canal
  • Dissolution of inorganic and organic pulpal material
  • Lubricate root canal instruments
  • Remove endodontic smear layer
  • Flush out debris
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3
Q

What is the best irrigant it’s ideal strength?

A
  • Sodium hypochlorite 3%
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4
Q

Caution to take into account when using irrigant?

A
  • Ensure extreme care to prevent sodium hypochlorite from touching soft tissues
  • Allergic reactions
  • Discolouration of fabric
  • Opthalmic injuries due to eye contact
  • Apical extrusion leading to soft tissue necrosis
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5
Q

What is working length?

A
  • CWL measured from fixed reference point which will remain unchanged throughout treatment within clinicians view to the apical foramen
  • Ideally measured from tip of cusps
  • Can be done by radiographs/electric pulp locator/paper point length
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6
Q

What radiographs used for endo?

A
  • PA green
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7
Q

During instrumentation of canal where is considered the ideal end point of shaping/obturation?

A
  • Correct working length
  • Should be 1mmfrom radiographic apex
  • Check for tug back from apical constriction
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8
Q

What is the term for maintaining communication between pulpal space and peri-radicular tissues?

A
  • Patency
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9
Q

Potential causes of corrected working length changing during course of endodontic shaping?

A
  • Debris accumulation in apical region of canal
  • Ledge formation
  • Perforation
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10
Q

What are some common intra-operative radiographs can be utilised during endodontic treatment to aid working length determination?

A
  • Master cone radiograph
  • Corrected working length radiograph
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11
Q

Why is non setting calcium hydroxide an ideal inter appointment medicament?

A
  • Antimicrobial properties
  • Anti endotoxin properties
  • Promotes tooth remineralisation
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12
Q

Reason for obturating

A
  • Promote haematic healing of periapical tissue
  • Seal canals laterally and apically to prevent ingress of microorganisms and fluids into canal system
  • Prevent bacteria from entering canal and periapical tissue and to prevent perio-endodontic lesions from occurring
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13
Q

Components of GP

A
  • 20% Gutta Percha
  • 66% Zinc oxide
  • 10-15% radiopacifier
  • 5% plasticizer
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14
Q

Why use sealer during cold lateral compaction?

A
  • Promotes haematic seal as has antimicrobial properties
  • Fills voids and irregularities between GP cone tips and walls
  • Seals space between walls and cone to create homogenous seal
  • lubricate during obturation
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15
Q

What is Patency?

A
  • Ability of file or instrument to pass through full length of root canal system without encountering any obstructions of blockages
  • Important to allow release of PA pressure and maintain cleanliness of canal system
  • Achieved by regularly irrigating and using small flexible files with 3 pick motion
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