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Copyright © 2005 by Elsevier Inc. All rights reserved. Dental Liners, Bases, and Bonding Systems Chapter 44.

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Presentation on theme: "Copyright © 2005 by Elsevier Inc. All rights reserved. Dental Liners, Bases, and Bonding Systems Chapter 44."— Presentation transcript:

1 Copyright © 2005 by Elsevier Inc. All rights reserved. Dental Liners, Bases, and Bonding Systems Chapter 44

2 Copyright © 2005 by Elsevier Inc. All rights reserved. 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.

3 Copyright © 2005 by Elsevier Inc. All rights reserved. Design of the Cavity Preparation –Gives strength within the tooth –Helps determine how the tooth will hold the restoration in place Prepared Tooth Structures

4 Copyright © 2005 by Elsevier Inc. All rights reserved. Types of StimulusExamples of Stimulus PhysicalThermal, electrical MechanicalHandpiece, traumatic occlusion ChemicalAcid from dental materials BiologicBacteria from saliva Pulpal Responses

5 Copyright © 2005 by Elsevier Inc. All rights reserved. Dental liners provide a thin barrier to protect the pulpal tissue from irritation caused by physical, mechanical, chemical and biologic elements. Dental Liners

6 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

7 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

8 Copyright © 2005 by Elsevier Inc. All rights reserved. Fig Location for placement of calcium hydroxide

9 Copyright © 2005 by Elsevier Inc. All rights reserved. Varnish A liquid consisting of one or more resins in an organic solvent applied to the internal preparation structure.

10 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

11 Copyright © 2005 by Elsevier Inc. All rights reserved. Application Process –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

12 Copyright © 2005 by Elsevier Inc. All rights reserved. Fig Location for placement of cavity varnish

13 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

14 Copyright © 2005 by Elsevier Inc. All rights reserved. Application Process –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

15 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

16 Copyright © 2005 by Elsevier Inc. All rights reserved. Zinc Oxide Eugenol (ZOE) Zinc Phosphate Polycarboxylate Glass Ionomer Types of Base Materials

17 Copyright © 2005 by Elsevier Inc. All rights reserved. Fig Location for placement of a base

18 Copyright © 2005 by Elsevier Inc. All rights reserved. Dental bonding improves retention by creating a micromechanical retention between the tooth structure and the restoration. Dental Bonding

19 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

20 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

21 Copyright © 2005 by Elsevier Inc. All rights reserved. Etching Systems remove the smear layer in preparation for bonding. Supplied as: –Liquid/Gel –Maleic acid –Phosphoric acid Etching Systems

22 Copyright © 2005 by Elsevier Inc. All rights reserved. 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

23 Copyright © 2005 by Elsevier Inc. All rights reserved. Table 44-1 Supplementary Dental Materials and Application in Order of Use


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