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level: OBTURATION

Questions and Answers List

level questions: OBTURATION

QuestionAnswer
Three dimensional filling of the entire root canal system as close to the cemento-dentinal junction as possibleOBTURATION
TRUE OR FALSE: Minimal amount of root canal sealers are used in conjunction with the core filling material to establish adequate sealTRUE
______ is the terminal end also of obturationApical constriction
OBJECTIVES OF OBTURATIONTo eliminate all avenues of leakage from the oral cavity or periradicular tissues into the root canal; To seal within the system any irritants that cannot be fully removed during canal cleaning and shaping procedure
When to obturateAsymptomatic tooth; Intact seal; dryable canal; no sinus tract, no foul odor, properly flared, negative culture test
Types of root canal filling material:Major advantage is their ability to control length as well as reasonable ability to create and adequate sealSolid Materials
Gutta Percha comes from theDried juice of Taban tree (Isonandra gutta)
SOLID MATERIALS FOR OBTURATION: Reported as a root canal filling material since 1865Gutta Percha
GUTTA PERCHA(COMPOSITION): gutta percha19-22%
GUTTA PERCHA(COMPOSITION): zinc oxide59-79%
GUTTA PERCHA(COMPOSITION): heavy metal salts1-17%
GUTTA PERCHA(COMPOSITION): wax or resin1-4%
GUTTA PERCHA: Shapesstandardized, conventional
SOLID MATERIALS FOR OBTURATION: Currently there is no other obturating material that provides the advantage of this materialGutta Percha
SOLID MATERIALS FOR OBTURATION(advantages): Plasticity- adapts to canal walls after compaction, Easy to remove from the canal, Low toxicity- nearly inert over timeGutta Percha
SOLID MATERIALS FOR OBTURATION(disadvantages): Lack of adhesion to dentin; Slight elasticity which causes a rebound and pulling away from the canal wallsGutta Percha
Types of root canal filling material:Material of choice in most situationsGutta Percha
TRUE OR FALSE: “What is inserted in the root canal system is more important than what is removed from the system”FALSE
GUTTA PERCHA: Methods of placementLateral condensation technique; Vertical condensation technique
SOLID MATERIALS FOR OBTURATION: 1950s-1950s same size by files; not used as muchSilver points
SOLID MATERIALS FOR OBTURATION: pure metal; Conform to the standardized size and taper of the canalSilver points
SOLID MATERIALS FOR OBTURATION(advantages): Ease of placement; Length control; Rigidity and flexibilitySilver points
SOLID MATERIALS FOR OBTURATION(disadvantages): Poor long term choice as routine obturating material, Non-adaptability, Toxicity, Corrode when in prolonged contact with tissue fluidsSilver points
SOLID MATERIALS FOR OBTURATION(disadvantages): Difficult in removal, Post space removal, Long term failure, Apical and coronal seal inferior with that to GPSilver points
what is important with obturation using silver pointssealer
SOLID MATERIALS FOR OBTURATION: Synthetic root canal filling material; based on polymers of polyester; Contains fillers and radioapacifiers in a soft resin matrixResilon
SOLID MATERIALS FOR OBTURATION: Looks like gutta percha. Can be thermoplasticized at a lower temperature, Biocompatible and easily retrievable, Insoluble in waterResilon
Refers to a continuous solid layer that consists of: an etched layer of canal dentin impregnated with resin tagsMonoblock
The creation of a solid, bonded, continuous material from one dentin wall of the canal to the otherMonoblock Concept
Monoblock Concept: One added benefit of the Monoblock is that research has shown that its _______the ROOT by approximately 20%STRENGTHENS
SOLID MATERIALS FOR OBTURATION(advantages): Strengthens the root, Seals better, Easily be retrieved, Provides an immediate coronal sealResilon
Accomplishes the objective of providing a fluid-tight seal; the core occupies the space, serving as vehicle for sealer, Must be used in conjunction with GPSEALERS
functions of sealersActs as lubricant of master cone during insertion; Fills up canal irregularities; Allows adhesion of gutta-percha to dentin; Fills up accessory canals
Types of sealer(advantage):Long history of successful usageZnOE-based
Types of sealer(Disadvantage):Stains the tooth, Non adhesion, Soluble (susceptible t decomposition in tissue fluid)ZnOE-based
Types of sealer(Disadvantage):Weak and porous, CytotoxicZnOE-based
Types of sealer:Grossman’s paste, N2 RC2BZnOE-based
Types of sealer:Tubli-seal, pulp canal sealer, roth sealerZnOE-based
Types of sealer:EpoxyPlastics
Types of sealer(advantages):Adhesion, Long working time, Ease of manipulation, Very good sealabilityPlastics
Types of sealer(disadvantages):Staining, Relative insolubility in solvents, Toxic when unset, Soluble in oral fluidsPlastics
Types of sealer:Shows short term sealability and tissue toxicityCa(OH)2
Types of sealer:"preserve the vitality of the pulp stump and stimulate healing and hard tissue formation at the apical wound."Ca(OH)3
Types of sealer:Effect remains to be seen - during long-term exposure to tissue fluids they maintain their integrity.Ca(OH)4
Types of sealer:is soluble and may leach out and weaken the remaining cementCa(OH)5
Types of sealer:SealapexCa(OH)2
Types of sealer:Apexit; AcrosealCa(OH)7
Types of sealer(advantages):Dentin bonding properties is good, Ability to adhere to dentineGlass ionomer based
Types of sealer(advantages):Similar to traditional sealers, but this sealer is no longer available. Minimal antimicrobial activityGlass ionomer based
Types of sealer(disadvantages):difficult to remove in case of retreatmentGlass ionomer based
Types of sealer(advantages):Provide adhesion, Does not contain eugenol, Cases for post and coreResins
set slowly when mixed with an activatorEpoxy resin base
Types of sealer:Has good sealing and adhesive properties, and antibacterial activityResins
Types of sealer:However, produces an initial severe inflammatory reaction which subsides after some weeks and the material is then well tolerated by the periapical tissuesResins
Types of sealer:strong allergenic and mutagenic potential and cases of contact allergy and paraesthesiaResins
Types of sealer:Releases formaldehyde explain its strong antibacterial effectResins
Ah26 silver free is indicated foropen apices, perforations, apicoectomy
SILICONE-BASED SEALERS: is a polydimethylsiloxane-based sealer.RoekoSeal
SILICONE-BASED SEALERS: Expands slightly on setting (0.2%)RoekoSeal
SILICONE-BASED SEALERS:Highly radiopaque;RoekoSeal
SILICONE-BASED SEALERS:the claimed advantages include good sealing ability 33 and excellent biocompatibility.RoekoSeal
SILICONE-BASED SEALERS:Histopathological study on periapical healing in dog's teeth, no differences were noted betweenRoekoSeal
SILICONE-BASED SEALERS: introduced in 2004, is a modification of RoekoSeal.GuttaFlow
SILICONE-BASED SEALERS:Contains particles of gutta-percha less than 30 um in xdsize and and also expands slightly (0.2%) on curing almost insoluble.GuttaFlow
SILICONE-BASED SEALERS:Used with a single master gutta-percha cone, without mechanical compaction,Lateral or vertical condensation are acceptable.GuttaFlow
SILICONE-BASED SEALERS:Flow is significantly better into lateral grooves and depressions in the apical regions of root canals than lateral condensation or warm compaction with AH 26 sealer.GuttaFlow
SILICONE-BASED SEALERS:Working time of 15 minutes and a setting time of about 30 minutes,fast version has a 5 minute working time and a 10 minute set.GUTTAFLOW (ROEKO)
SILICONE-BASED SEALERS:DA potential concern is extrusion of material beyond the apex although its cytotoxicity is lower than some other sealersGUTTAFLOW (ROEKO)
Types of sealer: Potential bioactive property.CALCIUM SILICATE-BASED SEALERS
Types of sealer:Similar to other tricalcium silicate and dicalcium silicate-containing biomaterials, calcium hydroxide is produced on reaction with water.CALCIUM SILICATE-BASED SEALERS
Types of sealer:lt is anticipated that release of calcium and hydroxyl ions from the set sealer will result in the formation of apatites as it comes into contact with phosphate-containing fluidsCALCIUM SILICATE-BASED SEALERS
CALCIUM SILICATE-BASED SEALERS (PROROOT ENDO SEALERS): Powdertricalcium silicate and dicalcium silicate
CALCIUM SILICATE-BASED SEALERS (PROROOT ENDO SEALERS): setting retardantCalcium sulphate
CALCIUM SILICATE-BASED SEALERS (PROROOT ENDO SEALERS): radiopacifier and a small amount of tricalcium aluminateBismuth oxide
CALCIUM SILICATE-BASED SEALERS (PROROOT ENDO SEALERS): Liquid - viscous aqueous solution of a water-soluble polymerpolyvinyl-pyrrolidone homopolymer
Mixing of Sealer: TESTSdrop test, string out test
Mixing of Sealer: consistency of sealerThick consistency, creamy and homogenous
Mixing of Sealer:Should string approximately ___ inches02-Mar
Mixing of Sealer:The___ the mix the better the properties of the seeker and diminished toxicitythicker
PLACEMENT of Sealer:Paper point, Files, Lentulo spiral, Injection with special syringe
Instruments for sealing the root canallocking forceps, endodontic condensers, lentulo spirals
MASTER CONE (MC) SELECTION:must have a tug-back, must reach the working length, must have a dead stop when pushed apically
Tests applied for the master conevisual, tactile, radiographic
The obturation is only as good as the ____canal preparation