Copyright © 2005 by Elsevier Inc. All rights reserved. Dental Liners, Bases, and Bonding Systems...

Copyright © 2005 by Elsevier Inc. All rights reserved.

Dental Liners, Bases,and Bonding Systems

Chapter 44


Introduction

Dental liners, bases, and bonding systems are a supplemental classification of dental

materials that provide additional protection for the health and well-being

of the tooth being restored.


• Design of the Cavity Preparation

– Gives strength within the tooth

– Helps determine how the tooth will hold the restoration in place

Prepared Tooth Structures


Types of Stimulus Examples of Stimulus

Physical Thermal, electrical

Mechanical Handpiece, traumatic occlusion

Chemical Acid from dental materials

Biologic Bacteria from saliva

Pulpal Responses


Dental liners provide a thin barrier to protect the pulpal tissue from irritation

caused by physical, mechanical, chemical and biologic elements.

Dental Liners


• 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.

Calcium Hydroxide


• Application Process

– May be an advanced function in your state

– Placed directly over the deepest portion of the preparation

– Placed only on dentin

Calcium Hydroxide-cont’d


Fig. 44-1 Location for placement of calcium hydroxide


Varnish

A liquid consisting of one or more resins in an organic solvent applied to the

internal preparation structure.


• Indications for Use*

– Seal 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

Varnishes



– Applied with either a small disposable applicator or cotton pellet

– Thin coating of varnish placed on the internal walls, floor, and margin of a cavity preparation

– Allowed to air dry

– A second application is recommended

Varnishes-cont’d


Fig. 44-3 Location for placement of cavity varnish


• Indications for Use

– Treat or prevent hypersensitivity

– Used instead of a varnish

– Seal the dentinal tubules

– Ideal for use under all indirect restorations

Dentin Sealer



– Use material sparingly

– Do not allow to contact soft tissues (HEMA and glutaraldehyde)

– Apply the dentin sealer with the cotton-tipped applicator

– Apply over all areas of exposed dentin

Dentin Sealer-cont’d


• Dental bases provide different types of pulpal protection:

– Protective Base: Protects the pulp from a large restoration.

– Insulating Base: Protects the tooth from thermal shock.

– Sedative Base: Soothes a pulp that has been damaged by decay or irritated by mechanical means.

Dental Bases


Zinc Oxide Eugenol (ZOE)

Zinc Phosphate

Polycarboxylate

Glass Ionomer

Types of Base Materials


Fig. 44-5 Location for placement of a base


Dental bonding improves retention by creating a micromechanical retention

between the tooth structure and the restoration.

Dental Bonding


• Enamel bonding is placed directly on the intact enamel surface.

• Examples of Enamel Bonding

– Sealants

– Bonded orthodontic brackets

– Resin‑bonded bridges

– Bonded veneers

Enamel Bonding


• Dentin bonding is placed on the prepared dentin for the bonding of a restorative material to tooth structure.

• Smear Layer

– Thin layer of debris

– “Nature's bandage”

Dentin Bonding


• Etching Systems remove the smear layer in preparation for bonding.

• Supplied as:

– Liquid/Gel

– Maleic acid

– Phosphoric acid

Etching Systems


• Plaque or debris is removed before the bonding process.

• Etchant is applied to remove the smear layer.

• Rinsing and Drying of tooth structure (avoid overdrying etched teeth).

• Bonding solution covers all surfaces.

• Too much bonding is better than too little.

• Contamination with saliva requires the entire procedure to be redone.

• Allow time for bonding material to mature before completing the restoration.

Clinical Application of the Etchant and Bonding Systems


Table 44-1 Supplementary Dental Materials and Application in Order of Use

Copyright © 2005 by Elsevier Inc. All rights reserved. Dental Liners, Bases, and Bonding Systems...

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