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

Copyright 2003, Elsevier Science (USA). All rights reserved.

Chapter 44 Dental Liners, Bases and

Bonding Systems

Chapter 44 Dental Liners, Bases and

Bonding Systems

Copyright 2003, Elsevier Science (USA).

All rights reserved. No part of this product may be reproduced or transmitted in any form or by any means, electronic or mechanical, including input into or storage in any information system, without permission in writing from the publisher.

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ISBN 0-7216-9770-4


IntroductionIntroduction 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.

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.


The design of the cavity preparation gives strength within the tooth and helps determine how the tooth will hold the restoration in place.

The design of the cavity preparation gives strength within the tooth and helps determine how the tooth will hold the restoration in place.

Prepared Tooth StructuresPrepared Tooth Structures


Types of stimulus Examples of stimulusPhysical Thermal, electrical

Mechanical Handpiece, traumatic occlusion

Chemical Acid from dental materials

Biologic Bacteria from saliva

Types of stimulus Examples of stimulusPhysical Thermal, electrical

Mechanical Handpiece, traumatic occlusion

Chemical Acid from dental materials

Biologic Bacteria from saliva

Pulpal Responses Pulpal Responses


Dental liners provide a thin barrier that protects the pulpal tissue from irritation caused by physical, mechanical, chemical and biologic element.

Dental liners provide a thin barrier that protects the pulpal tissue from irritation caused by physical, mechanical, chemical and biologic element.

Dental LinersDental 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.

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 HydroxideCalcium Hydroxide


Application process• Placed only on dentin. • Placed directly over the deepest portion

of the preparation.

Application process• Placed only on dentin. • Placed directly over the deepest portion

of the preparation.

Calcium Hydroxidecont’dCalcium Hydroxidecont’d


Fig. 44-1 Location for placement of calcium hydroxide.Fig. 44-1 Location for placement of calcium hydroxide.


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.

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.

VarnishesVarnishes


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.

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.

Varnishescont’dVarnishescont’d


Fig. 44-5 Location for placement of cavity varnish.Fig. 44-5 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.

Indications for use• Treat or prevent hypersensitivity.• Used instead of a varnish. • Seal the dentinal tubules. • Ideal for use under all indirect

restorations.

Dentin SealerDentin Sealer


Application Process• Material used 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 the exposed

dentin.

Application Process• Material used 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 the exposed

dentin.

Dentin Sealercont’dDentin Sealercont’d


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.

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.

Dental BasesDental Bases


Zinc oxide eugenol Zinc phosphate Polycarboxylate Glass ionomer

Zinc oxide eugenol Zinc phosphate Polycarboxylate Glass ionomer

Types of Base Materials Types of Base Materials


Fig. 44-8 Location for placement of a base.Fig. 44-8 Location for placement of a base.


Dental bonding improves retention by creating a micromechanical retention between the tooth structure and the restoration.

Dental bonding improves retention by creating a micromechanical retention between the tooth structure and the restoration.

Dental BondingDental Bonding


Enamel bonding is placed directly onto the intact enamel surface.

Examples of Enamel Bonding • Sealants• Bonded orthodontic brackets• Resin‑bonded bridges• Bonded veneers

Enamel bonding is placed directly onto the intact enamel surface.

Examples of Enamel Bonding • Sealants• Bonded orthodontic brackets• Resin‑bonded bridges• Bonded veneers

Enamel Bonding Enamel Bonding


Dentin bonding is placed on prepared dentin in order to bond.

Smear layer• Thin layer of debris • “Nature's bandage”

Dentin bonding is placed on prepared dentin in order to bond.

Smear layer• Thin layer of debris • “Nature's bandage”

Dentin Bonding Dentin Bonding


Etching Systems remove the smear layer in preparation for bonding.

Supplied as:• Liquid/Gel• Maleic acid• Phosphoric acid

Etching Systems remove the smear layer in preparation for bonding.

Supplied as:• Liquid/Gel• Maleic acid• Phosphoric acid

Etching Systems Etching 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.

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.

Clinical Application of the Etchant and Bonding SystemsClinical Application of the Etchant and Bonding Systems


Table 44-2: Supplementary Dental Materials and their Application in Order of Use Table 44-2: Supplementary Dental Materials and their Application in Order of Use

Documents

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