Podcast
Questions and Answers
What is the approximate melting temperature of alpha phase Gutta Percha (GP)?
What is the approximate melting temperature of alpha phase Gutta Percha (GP)?
- Unknown
- Above 65ËšC (correct)
- At room temperature
- Below 65ËšC
What is the percentage of ZO powder in Gutta Percha cones?
What is the percentage of ZO powder in Gutta Percha cones?
- 1-4%
- 60-75% (correct)
- 1-18%
- 18-22%
What is the function of metal sulphates in Gutta Percha cones?
What is the function of metal sulphates in Gutta Percha cones?
- To increase the viscosity
- To act as a plasticizer
- To make it radio-opaque (correct)
- To inhibit bacterial growth
What is the advantage of Gutta Percha?
What is the advantage of Gutta Percha?
What is the disadvantage of Gutta Percha?
What is the disadvantage of Gutta Percha?
What is Gutta Flow?
What is Gutta Flow?
What is the cooling rate of beta phase Gutta Percha?
What is the cooling rate of beta phase Gutta Percha?
What is the function of waxes and resins in Gutta Percha cones?
What is the function of waxes and resins in Gutta Percha cones?
What is the primary requirement for an ideal root canal filling material to seal the root canal?
What is the primary requirement for an ideal root canal filling material to seal the root canal?
What is the main difference between rubber and gutta percha?
What is the main difference between rubber and gutta percha?
What is the name of the tree from which gutta percha is harvested?
What is the name of the tree from which gutta percha is harvested?
What is the commercial form of gutta percha?
What is the commercial form of gutta percha?
What is the main advantage of using gutta percha as a root canal filling material?
What is the main advantage of using gutta percha as a root canal filling material?
What is the ideal state of a root canal filling material before insertion?
What is the ideal state of a root canal filling material before insertion?
What is the effect of shrinkage on a root canal filling material?
What is the effect of shrinkage on a root canal filling material?
What is the purpose of a root canal filling material being radiopaque?
What is the purpose of a root canal filling material being radiopaque?
What is a disadvantage of calcium hydroxide-based sealers?
What is a disadvantage of calcium hydroxide-based sealers?
Which type of sealer has excellent adhesion to the canal wall?
Which type of sealer has excellent adhesion to the canal wall?
What is a characteristic of silicone-based sealers?
What is a characteristic of silicone-based sealers?
What is a disadvantage of medicated sealers?
What is a disadvantage of medicated sealers?
What is a characteristic of Guttaflo?
What is a characteristic of Guttaflo?
What is a disadvantage of glass ionomer-based sealers?
What is a disadvantage of glass ionomer-based sealers?
What type of sealer is ACTIV GP?
What type of sealer is ACTIV GP?
What is a category of resin sealers?
What is a category of resin sealers?
What is the composition of Silver Cones?
What is the composition of Silver Cones?
What is the primary function of a Root Canal Sealer?
What is the primary function of a Root Canal Sealer?
What is the advantage of Resilon over gutta-percha?
What is the advantage of Resilon over gutta-percha?
What is a requirement of an ideal Root Canal Sealer?
What is a requirement of an ideal Root Canal Sealer?
What is a disadvantage of Silver Cones?
What is a disadvantage of Silver Cones?
What is the classification of Root Canal Sealer based on Zinc oxide and Eugenol?
What is the classification of Root Canal Sealer based on Zinc oxide and Eugenol?
What is an advantage of Zinc oxide & Eugenol sealers?
What is an advantage of Zinc oxide & Eugenol sealers?
What is the function of a Root Canal Sealer in terms of accessory canals?
What is the function of a Root Canal Sealer in terms of accessory canals?
What is a common disadvantage of methacrylate resin sealers like AH26?
What is a common disadvantage of methacrylate resin sealers like AH26?
What is the main advantage of bioceramic sealers in terms of bonding?
What is the main advantage of bioceramic sealers in terms of bonding?
What is one of the methods of sealer placement?
What is one of the methods of sealer placement?
What is the purpose of the 'string out test' in testing sealer mix?
What is the purpose of the 'string out test' in testing sealer mix?
What is an advantage of methacrylate resin sealers?
What is an advantage of methacrylate resin sealers?
What is the main disadvantage of bioceramic sealers?
What is the main disadvantage of bioceramic sealers?
What is the purpose of the 'drop test' in testing sealer mix?
What is the purpose of the 'drop test' in testing sealer mix?
What is an advantage of bioceramic sealers in terms of physical properties?
What is an advantage of bioceramic sealers in terms of physical properties?
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Study Notes
Ideal Root Canal Filling Material
- Should be easily introduced into the root canal
- Should seal the canal laterally and apically
- Should not shrink after being inserted
- Should be impervious to moisture
- Should be bacteriostatic or at least not encourage bacterial growth
- Should be radiopaque
- Should not stain tooth structure
- Should not irritate periradicular tissue
- Should be sterile, or easily and quickly sterilized, immediately before insertion
Materials Used for Root Canal Filling
- Semisolid materials: Gutta Percha, Resilon
- Solid materials: Silver points
- Cements and pastes: Sealers, MTA, Calcium phosphate, Gutta-flow
Gutta Percha
- A rubbery material harvested from certain trees (Palaquium gutta)
- An isomer with rubber (same chemical formula, different chemical structure)
- Exists in two crystalline forms: Alpha and Beta
- Properties differ between the two forms due to difference in cooling rates
- Beta form is most commonly used commercially
- Composition of Gutta Percha cones:
- Gutta Percha (18-22%)
- ZO powder (60-75%)
- Waxes and resins (1-4%)
- Metal sulphates (1-18%)
- Classified into standardized and non-standardized forms
- Medicated Gutta Percha cones available
- Can be used with obtura system or in syringe form (Success fil, Alphaseal)
Advantages of Gutta Percha
- Compactability
- Dimensional stability
- Inert and tissue tolerance
- Plasticity
- Radioopacity
- Ease of removal from root canal
Disadvantages of Gutta Percha
- Lack of rigidity
- Lack of length control
- Lack of adhesiveness
Silver Cones
- Composition: 99.9% silver, 0.1% Nickel + copper
- Advantages:
- Rigid
- Easily placed
- Can be precurved
- Disadvantages:
- Lack of adaptation
- Corrosion and tissue irritation
- Can't be dissolved in organic solvents
Resilon
- A resin-based obturation system
- Alternative to Gutta Percha
- Consists of a resin core and resin sealer
- Bonds to resin sealer, which attaches to etched root surface forming a "Monoblock"
- Provides better coronal seal and may strengthen the root
Root Canal Sealer
- Definition: Material used to fill micro irregularities and minor discrepancies between the core filling material and the root canal wall
- Functions:
- Fills canal irregularity and minor discrepancies
- Acts as a lubricant and aids in seating of cones
- Fills accessory canals
- Antimicrobial
- Requirements of an ideal sealer:
- Adhesive to canal wall and filling materials
- Provides fluid-tight seal
- Radiopaque
- Bacteriostatic
- Soluble in common solvents
- Sets slowly during working time
- Particles of powder should be very fine
Classifications of Root Canal Sealer
- Zinc oxide Eugenol based sealers
- Calcium hydroxide-based sealer
- Medicated root canal sealer
- Glass ionomer-based sealer
- Silicon-based sealer
- Resin-based sealer
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