Transcript Chapter 44 Dental Liners, Bases and Bonding Systems Copyright 2003, Elsevier Science (USA). All rights reserved.

Chapter 44
Dental Liners, Bases and
Bonding Systems
Copyright 2003, Elsevier Science (USA).
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Produced in the United States of America
ISBN 0-7216-9770-4
Copyright 2003, Elsevier Science (USA). All rights reserved.
Introduction
Dental liner, bases, and bonding systems are in a
classification of dental materials that provide
additional protection for the health and well-being
of a tooth being restored.
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Prepared Tooth Structures
 The design of the cavity preparation gives
strength within the tooth and helps determine
how the tooth will hold the restoration in place.
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Pulpal Responses
Types of stimulusExamples of stimulus
Physical
Thermal, electrical
Mechanical
Handpiece,
traumatic occlusion
Chemical
Acid from dental
materials
Biologic
Bacteria from saliva
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Dental Liners
 Dental liners provide a thin barrier that protects
the pulpal tissue from irritation caused by
physical, mechanical, chemical and biologic
element.
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Calcium Hydroxide
 Indications for use
• Protects the pulp from chemical irritation by
its sealing ability.
• Stimulates the production of reparative or
secondary dentin.
• Compatible with all types of restorative
materials.
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Calcium Hydroxide-cont’d
 Application process
• Placed only on dentin.
• Placed directly over the deepest portion of
the preparation.
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Fig. 44-1 Location for placement of calcium hydroxide.
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Varnishes
 Indications for use*
• Seal the dentinal tubules.
• Reduce leakage around a restoration.
• Act as a barrier to protect the tooth from
highly acidic cements such as zinc phosphate.
* This material is contraindicated in its use under
composite resins and glass ionomer restorations.
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Varnishes-cont’d
 Application process
• Applied with either a small disposable
applicator or a cotton pellet.
• Thin coating of the varnish on the walls,
floor, and margin of the cavity preparation.
• Apply a second coat.
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Fig. 44-5 Location for placement of cavity varnish.
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Dentin Sealer
 Indications for use
•
•
•
•
Treat or prevent hypersensitivity.
Used instead of a varnish.
Seal the dentinal tubules.
Ideal for use under all indirect restorations.
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Dentin Sealer-cont’d
 Application Process
• Material used sparingly.
• Do not allow to contact soft tissues (HEMA
and glutaraldehyde).
• Apply the dentin sealer with the cottontipped applicator.
• Apply over all areas of the exposed dentin.
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Dental Bases
 Dental bases provide pulpal protection.
• Protective base: Protect the pulp before
the restoration is placed.
• Insulating base: Protect the tooth from
thermal shock.
• Sedative base: Soothe a pulp that has
been damaged by decay or irritated by
mechanical means.
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Types of Base Materials




Zinc oxide eugenol
Zinc phosphate
Polycarboxylate
Glass ionomer
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Fig. 44-8 Location for placement of a base.
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Dental Bonding
 Dental bonding improves retention by creating
a micromechanical retention between the tooth
structure and the restoration.
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Enamel Bonding
 Enamel bonding is placed directly onto the

intact enamel surface.
Examples of Enamel Bonding
• Sealants
• Bonded orthodontic brackets
• Resin-bonded bridges
• Bonded veneers
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Dentin Bonding
 Dentin bonding is placed on prepared dentin in

order to bond.
Smear layer
• Thin layer of debris
• “Nature's bandage”
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Etching Systems
 Etching Systems remove the smear layer in

preparation for bonding.
Supplied as:
• Liquid/Gel
• Maleic acid
• Phosphoric acid
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Clinical Application of the Etchant and
Bonding Systems
 Etchant is applied to remove the smear layer.
 Plaque or debris is removed before the bonding





process.
Avoid overdrying etched teeth.
Too much primer is better than too little.
Bonding solution covers all surfaces.
Contamination with saliva requires the entire
procedure to be redone.
Allow time for bonding material to mature
before completing the restoration.
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Table 44-2: Supplementary Dental Materials and their
Application in Order of Use
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