ROOT CANAL SEALERS
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Transcript of ROOT CANAL SEALERS
ROOT CANAL SEALERS
BYG.SANDHYA3RD YEARCHETTINAD DENTAL COLLEGE AND RESEARCH INSTITUTE
Root canal sealers are used in conjunction with biologically acceptable semisolid or solid obturating materials to establish an adequate seal of the root canal system.
ABSENCE OF ROOT
CANAL SEALANT
APPLICATION OF ROOT CANAL SEALANT PREVENTS THE BACTERIAL GROWTH AND PENETRATION
FUNCTIONS OF ROOT CANAL SEALERS
Serves as a filler for canal irregularities and minor discrepancies between the root canal wall and core filling material.
To obturate the lateral canals
Acts as lubricant
Enhances the possible attainment of an impervious seal
Can assist in microbial control.
For radiopacity
IDEAL REQUIREMENTS:
Should provide an excellent seal when set.
Should produce adequate adhesion between itself , the canal walls, and the filing material.
Should be radiopaque.
Should be nonstaining.
Should be dimensionally stable.
Should be easily mixed and introduced into the canals.
Should be easily removed if necessary.
Should be insoluble in tissue fluids.
Should be bactericidal or discourage bacterial growth.
Should be non irritating to the peri radicular tissues.
Should be slow setting to ensure sufficient working.
CLASSIFICATION OF CURRENTLY EMPLOYED ROOT CANAL SEALANTS: (GROSSMAN)I. Zinc oxide eugenol based sealers
II. Calcium hydroxide based sealers
III. Glass ionomer based sealers
IV. Resin based sealers
a) Grossmans’s formulab) Roth’s 801c) Tubliseal
a) Sealapexb) Apexit
a) Ah plusb) Ah26c) Epiphanyd) Diaket
ZINC OXIDE-EUGENOL CEMENTS:
zinc oxide-eugenol cements modified for endodontic use
Mixing vehicle is mostly eugenol or in combination with other liquids like canada balsam.
Setting time adjusted for adequate working time.
Radiopacity 4-5mm of aluminium.
GROSSMAN’S SEALER Modified grossman’s formula-1974
Most advocated –provides good seal .
COMPOSITION:POWDER
Zinc oxide - 40parts
Staybellite resin- 30 parts
Bismuth subcarbonate- 15 parts
Barium sulphate- 15parts
Sodium borateAnhydrous- 1 part
LIQUID
Eugenol
PROPERTIES:
Plasticity and slow setting time-sodium borate anhydrate.Good sealing potential and small volumetric changeApical extrusion gets absorbed.
DISADVANTAGES:Resin is of coarse particle size
SETTING TIME:Hardens approximately 2hrs 37 degree C in canal.
MANIPULATION:
Sterile glass slab with spatula,2 or 3 drops of liquid-small increments of cement powder,2 smooth creamy consistency.
To test proper consistency- drops test and string out test
Commercially available as Roth’s 801 root canal sealer
WACH’S SEALER
POWDER
Zinc oxide 10gms
Tricalcium phophate 2gms
Bismuth subnitrate 3.5gms
Bismuth subiodide 0.3gms
Heavy magnesium oxide
0.5gms
LIQUID
Canada balsam 20ml
Oil of cloves 6ml
INDICATION:All the lateral condensation methods, when chance of overfilling is present.
CONTAINDICATIONS:When heavy lubrication is needed.
PROPERTIES:Medium working time .Medium lubricating qualityMinimal periapicalSticky (canada balsam)Should be mixed to smooth creamy consistency Should string out atleast 1 inch when spatula raisedIcrasing thickness of sealer lessens lubricating effect, so indicated when there is possibility of over extensionAvailable as powder and liquid in separate bottles.
ADVANTAGES:
Germicidal ,less periapical irritation ,stays in position .
DISADVANTAGES:
Odour of the liquid.
TUBLI SEAL
Slight modification made in rickert’s formula2 paste system –base and catalyst
COMPOSITION:
BASEZinc oxide 57-59%
Olea resins 18.5-21.5%
Bismuth trioxide 7.5%
Thymol iodide 3.75-5%
Oil and waxes 10%
LIQUIDEugenol
Polymerised resin
Annidalin
SETTING TIME20 mins- glass slab5min-root canal
ADVANTAGES:
Easy to mixExtremely lubricatedDoes not stainExpands after setting.
DISADVANTAGES:
Irritant to periapical tissuesVery low viscosity –extrusion through apical foramen.Working time less than 30mins and even shorter in presence of moisture.
INDICATIONS:
when apical surgery to be performed immediately after filling
Because of great lubricating property –good choice when it becomes difficult for a master cone to reach last mm of preparation.
ADVANTAGES AND DISADVANTAGES OF ZOE SEALERS:
ADVANTAGES:
Ease of manipulation Adhesion to dentinal walls, only slight dimensional change.Radiopaque , germicidal property, minimal staining, ample working time
DISADVANTAGES:
All are cytotoxic and inflammatory response is seen.Not easily absorbed from apical tissues.
SEALAPEX
SEAL APEX
Non –eugenol calcium hydroxide polymeric resin root canal sealer.
100% humidity takes 3 weeks to reach final set , never sets in dry atmosphere.
Sealer expands while setting
APEXITAvailable in syringes.
COMPOSITION:
BASE WEIGHT%Calcium hydroxide/calcium oxide
36.9
Hydrated collophonium
54.0
Fillers and other auxiliary materials.
9.1
CATALYST WEIGHT%
Disalicylate 47.6
Bismuth hydroxide/bismuthcarbonate
36.4
Fillers and other auxiliary materials
16.0
ADVANTAGES:
Excellent biological tolerance.
Easy to mix
Radiopaque
Hard setting
GLASS IONOMER
SEALERS
Less tissue irritation , low toxicity
Because of adhesive qualities recommended as sealers.
It is not used nowadays because of difficulty to remove from root canal.
ADVANTAGES:
Best physical qualities, best bonding to dentin, fewest voids, best flow , strengthen the roots.
DISADVANTAGES:
Cannot be removed from the root canal.
RESIN BASED ROOT CANAL SEALERSDIAKET:
Polyvinyl resin and reinforced chelate formed between zinc oxide and diketone
Fine white powder and viscous honey coloured liquid, 2 drops of liquid mixed with 1 scoop of powder
Hardens rapidly about 6-8 mins on glass slab even more rapidly on root canal
Known for its resistance to absorption ,superior to other sealers in tensile strength and resistance to permeability.
Mild inflammatory reaction occurs when over filled.
AH 26Epoxy resin sealers characterised by reactive epoxide ring polymerised by the breaking of this ring.PROPERTIES:Good adhesive property.Good flow Antibacterial contracts slightly while hardeningLow toxicityAddition of hardener makes cured resin chemically and biologically inertConsists of yellow powder and viscous resin liquid mixed to hick creamy consistencySlow setting 36-48 hrs at body temperature and 5-7 days at room temperature.Long setting time and material fluidityNo cracking or separation from the dentinal wallsIt releases formaldehyde during setting.
AH PLUS
Epoxy resin based sealer,2 component paste.
Easy to mix and adapt closely o the root canal.
Minimal shrinkage upon setting ,long term dimentional stability
Mix equal volume of paste A and paste B.
Setting time 8 hours at 37 degree C.
Spatulas, mixing slab and instruments immediately cleaned with alcohol or acetone.
ADVANTAGES:
Excellent biocompatibility
Easy handling and application
Outstanding physical properties
Excellent radiopacity
Suitable for all oburation techniques.
ADVERSE REACTIONS:
Reversible acute inflammation of the oral mucosa when it is exposed to the unset paste.
It does not re
lease
formaldehyde during
setting and hence
more safer than
AH26
APPLICATION OF ROOT CANAL
SEALERSMEASURING THE WORKING LENGTH COMPLETE DRYING OF CANAL
APPLICATION USING PAPER
POINT OR MASTER CONE
EXCESS MATERIAL IS REMOVED
REACTIONS TO THE OBTURATING MATERIALS:
If the material is extruded into the periradicular tissue it can be highly irritating and may reduce the probability of healing by about 25%.
Zinc oxide eugenol type of sealers are probably irritating because of eugenol.
Epoxy resin sealers are more biocompatible.
All the filing materials should be confined to the root canal.
THANK YOU