Podcast
Questions and Answers
Why do we need an intermediary restorative material?
Why do we need an intermediary restorative material?
- To cause pulp reaction
- To expose the pulp to thermal, galvanic, and chemical irritations
- To protect the pulp against various irritations (correct)
- To increase the penetration through dentinal tubules
What is the best barrier between any restorative material and the pulp?
What is the best barrier between any restorative material and the pulp?
- Enamel
- Pulp stones
- Dentin (correct)
- Cementum
What is the purpose of sealing dentinal tubules?
What is the purpose of sealing dentinal tubules?
- To promote thermal irritation
- To enhance galvanic irritation
- To prevent penetration through dentinal tubules (correct)
- To increase pulp exposure
When is a base necessary according to the text?
When is a base necessary according to the text?
What are liners and bases used for in dentistry?
What are liners and bases used for in dentistry?
What do liners and bases aim to protect the pulp against?
What do liners and bases aim to protect the pulp against?
Which protective material is biologically compatible and non-irritating?
Which protective material is biologically compatible and non-irritating?
What is the purpose of using a cavity sealer like varnish?
What is the purpose of using a cavity sealer like varnish?
Why can't varnish be used with bonded restorations of any type?
Why can't varnish be used with bonded restorations of any type?
What is the ideal protective material that bonds to the tooth structure and is bondable to composite and amalgam?
What is the ideal protective material that bonds to the tooth structure and is bondable to composite and amalgam?
Which material provides adequate workability while being fast setting as a protective material?
Which material provides adequate workability while being fast setting as a protective material?
What is the main function of an intermediate liner material?
What is the main function of an intermediate liner material?
Why is blocking out undercuts important for inlay or onlay preparations?
Why is blocking out undercuts important for inlay or onlay preparations?
Which cement is contraindicated with resin restorations due to containing Eugenol?
Which cement is contraindicated with resin restorations due to containing Eugenol?
What property makes Glass Ionomer Cements unsuitable for direct pulp exposures or near exposures?
What property makes Glass Ionomer Cements unsuitable for direct pulp exposures or near exposures?
Why is a varnish required with Zinc Phosphate Cement?
Why is a varnish required with Zinc Phosphate Cement?
What makes Polycarboxylate Cement different from Zinc Phosphate Cement?
What makes Polycarboxylate Cement different from Zinc Phosphate Cement?
Which cement has an acidic nature that can be irritating to the pulp?
Which cement has an acidic nature that can be irritating to the pulp?
What is the additional benefit of B-Resin sealers compared to varnishes?
What is the additional benefit of B-Resin sealers compared to varnishes?
Which liner type is associated with an antibacterial effect and stimulation of reparative dentin?
Which liner type is associated with an antibacterial effect and stimulation of reparative dentin?
What is the pH level of Calcium Hydroxide?
What is the pH level of Calcium Hydroxide?
When is Calcium Hydroxide indicated for use?
When is Calcium Hydroxide indicated for use?
Which base type is defined as a dentin replacement material?
Which base type is defined as a dentin replacement material?
Study Notes
Intermediary Base Materials
- Sound dentin is the best barrier between any restorative material and the pulp.
- Minimum dentin thickness of 2.0 mm over the pulp is recommended to prevent pulp reaction.
Need for Intermediary Restorative Materials
- To protect the pulp from thermal, galvanic, and chemical irritation.
- To seal dentinal tubules and prevent penetration through them.
- To block out undercuts for inlay or onlay preparations.
- To provide a flat floor to improve resistance form.
- To possess adequate strength to support the restoration.
Liners and Bases
- Intermediary materials placed beneath definitive restorative materials to protect the pulp.
- Functions: prevent penetration, protect pulp, block out undercuts, provide flat floor, and possess adequate strength.
Types of Liners and Bases
- Zinc phosphate (1870): high compressive strength, but irritating to the pulp.
- Zinc polycarboxylate (1963): non-irritating, but lower compressive strength.
- Glass Ionomer Cements (1972): close to ideal liner or base, releases fluoride, adhesive bond to dentin, and universal use.
- Reinforced Zinc oxide & Eugenol (IRM): sedative, palliative to the pulp, low compressive strength, and does not bond to tooth structure.
- B-Resin Sealers: serves the same functions as varnishes, but with additional bonding benefits.
Liners with Therapeutic Effect
- Glass Ionomer Cements: fluoride release, antibacterial effect, and stimulation of reparative dentin.
- Calcium Hydroxide: alkaline, neutralizes acidic effect, accelerates formation of reparative dentin, and chemically cured.
Indications and Contraindications of Calcium Hydroxide
- Indications: thin layer near the pulp, shallow preparations, and dentin thickness less than 0.5-1.0 mm.
- Contraindications: dentin thickness greater than 1.0 mm, and direct pulp capping.
Ideal Pulp Protective Material
- Biologically compatible, non-irritating, and anticariogenic.
- Stimulates dentin bridge formation, has sufficient strength, is acid insoluble, and has adequate workability.
- Bonds to composite, amalgam, and tooth structure, and is radiopaque.
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Description
Test your knowledge on the concepts of intermediary restorative materials, including why they are needed, sources of irritation, differences between sealers, liners, and bases, ideal indications and uses, and recent materials used. Explore the importance of sound dentin as a barrier between restorative materials and the pulp.
