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Endodontics > Obturation > Flashcards

Obturation Flashcards

1
Q

Cold lateral compaction

A
  • master cone to CWL
  • check tuck back
  • GP should be at CWL and dry canal with paper points
  • coat GP cone with sealer
  • excess will lead to extrusion
  • Super- endo alpha to cut GP
  • use Vitrebond to place at orifice
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2
Q

Objective of RCT

A
  • provide an environment that allows healing of periradicular tissues so that tooth is retained as a functional unit in the dental arch
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3
Q

Working Length

A
  • prep should end at junction of pulpal and periapical tissue
  • WL should be as close as CDJ
  • usually the narrowest part of the canal, called apical constriction
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4
Q

Why fill RCS?

A
  • prevent passage of microorganisms ans fluid along RC and to fill whole canal system
  • not only block apical foramen but also the dentinal tubules and accessory canals
  • must be carried out after completion of RC prep and when infection is considered to ahve been eliminated and canal can be dried
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5
Q

Requirements for materials to fill RCS?

A
  • biocompatible
  • dimensionally stable
  • able to seal
  • unaffected by tissue fluid and insoluble
  • non- supportive of bacterial growth
  • radiopaque
  • removable from canal if re- tx needed
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6
Q

Why GP cone needs sealer?

A
  • to fill the voids between the semi solid material and root canal wall
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7
Q

GP cone Gutta- Percha

A
  • most common core material
  • 20% GP
  • 65% ZnO
  • 10% Radiopacifiers
  • 5% Plasticizers
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8
Q

Cold lateral compaction

A

Pros
- most commonly taught and used
- low cost
- ability to control length of fill

Cons
- voids
- spreader tracts
- incomplete fusion of GP cones
- lack of surface adaptation

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9
Q

Warm Vertical Compaction

A
  • achieve 3D obturation
  • require continuously tapering funnel and minimal apical diameter
  • remove more and more GP
  • apical plug of GP and sealer
  • place pieces of GP one by one
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10
Q

Continuous wave obturation

A
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11
Q

Carrier based obturation

A
  • use hand file as carrier with GP around
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12
Q

If tooth is dens in dente?

A
  • fill canal using Bioceramic cements
  • MTA - mineral trioxide aggregate
  • Biodentine
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13
Q

MTA

A
  • harder to remove
  • good tissue response
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14
Q

Sealer Functions?

A
  • seal space between dentinal wall and core
  • fills voids and irregularities in canal, lateral canals ands between GP points used in lateral condensation
  • lubricates during obturation
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15
Q

Properties of ideal sealer

A
  • exhibits tackiness to provide good adhesion
  • establish hermetic seal
  • radiopacity
  • easily mixed
  • no shrinkage on setting
  • non- staining
  • bacteriostatic/ does not encourage growth
  • slow set
  • insoluble in tissue fluid
  • tissue tolerant
  • soluble on re-tx
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16
Q

ZnO eugenol based sealer

A
  • antimicrobial
  • cytoprotection
  • resin acids affect lipids in cell membrane, hence antimicrobial/ cytotoxic
  • beneficial with longlasting antimicrobial with cytoprotective effects
  • lose volume with time due to dissolution
  • breakdown apical seal
17
Q

GI sealer

A
  • dentine bonding properties
  • will expand
  • minimal antimicrobial activity
  • greater solubility
  • removal for re- tx is diff
18
Q

Resin sealer, ie: AH plus

A
  • epoxy resin
  • paste- paste mixing
  • slow setting of 8 hours
  • good sealing ability
  • good flow
  • initial toxicity declining after 24 hours
19
Q

EndoRez as Resin sealer

A
  • UDMA resin based sealer
  • hydrophilic
  • good penetration to tubules
  • biocompatible
  • good radioopacity
20
Q

Calcium silicate sealers

A
  • high pH 12.8 during initial 24 hours of setting
  • hydrophilic
  • enhanced biocompatibility
  • does not shrink on setting
  • non- resorbable
  • excellent sealing ability
  • quick set 3-4 hours
  • requires moisture
  • easy to use
  • ie: Bioceramic
21
Q

Assess of obturation

A
  • post-op radiograph
  • length
  • taper
  • density
  • GP and sealer removal to facial CEJ in anteriors and canal orifice in posteriors
22
Q

Why tooth should be restored after RCF

A
  • prevent bacterial recontamination of RCS
  • prevent fracture of tooth
23
Q

Orifice closure

A
  • finish obturation at orifice/ below orifice level
  • ZnO/ Eugenol materials are cytotoxic and form effective antibacterial barrier
  • RMGI/ flowable composite
24
Q

CHX

A
  • bisbiguanide
  • works on bacterial cell walls causing cell lysis and cell death
25
Q

NaOCl extrusion

A
  • swelling
  • brusing/ ecchymosis
  • paraesthesia
  • haemorrhage
  • airway obstruction- submental, submandibular swelling

Endodontics (13 decks)

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