salah hasab mahmoud - delta univ · salah hasab mahmoud professor &chairman of operative...
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Salah Hasab Mahmoud
Professor &Chairman of Operative Dentistry Department , Faculty of Dentistry at Mansoura
University Member of Academy of Operative Dentistry
USA
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• Dental pulp is specialized connective tissue that occupies the pulp chamber and root canals. It comprises of nerves , vessels, lymph channels, etc.
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• Formative/ Developmental
• Nutritive
• Sensory
• Defensive/ Reparative
Knowledge of the size and contour of the pulp chamber is essential during cavity preparation
Mainly 4 functions
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• Caries is a bacterial infection
• All restorative procedures cause pulpal irritation.
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Remaining Dentinal Thickness
• No material that can be placed in a tooth provides better protection for the pulp than dentin.
• The RDT from the depth of cavity preparation to the pulp is the single important factor in protecting the pulp.
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• A 0.5-mm thickness reduces the effect of toxins by 75%. A 1.0-mm thickness reduces the effect of toxins by 90%.
• A 2.0-mm thickness or more lead to a little pulpal reaction.
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Stimuli that induce fluid movements in dentinal tubules distort odontoblast and afferent nerves (arrow), leading to a sensation of pain. Many operative procedures such as cutting or air-drying induce such fluid movement.
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Various Types of Pulp
Irritants
• Microbial irritation • Chemical Irritation
• Thermal irritation. • Radiant irritation
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• Microbial Irritants
• Bacteria that survive drying under the filling material remain viable for many years. Such dominant bacteria can become active when moisture reintroduced as a result of marginal percolation of various filling materials , poor marginal seal, improper condensation , etc.
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Mechanical and Thermal
Irritants
It depends on
• Type of filling material
• Coolant system
• Type, size and shape of bur
• Speed of rotation
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Chemical Irritants
They are
• Various filling materials
• Various medicaments used for desensitization or dehydration of dentin
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Radiant Irritants
• X ray radiation • Laser beam • Uptake of radium containing
water • Mechanical and Thermal
Irritations
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Inflammation
It is a complex vascular and lymphatic reaction as well as local tissue destruction . It involve macrophages , plasma cell and lymphocytes.
Pulpal irritation → pulpal inflammation
Invasion of microorganisms into the region of pulp injury is called infection
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Pulp Protection
To protect the pulp against those irritants we give
Chemical protection
Thermal protection
Electrical protection
Mechanical protection
Pulp medication
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Indications of Cavity Liners &
Bases
Schematic view of needs for pulpal protection below metallic restoration.
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Chemical protection
Sealing of dentinal tubules against
invasion of:
Bacteria, bacterial toxins, & enzymes
Corrosive products of amalgam
Chemical irritants of dental cement &restorative materials
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Thermal protection
Cavity bases act as thermal insulator
under metallic restorations
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Electrical protection
Cavity bases act as insulator against galvanism result from use of dissimilar metallic restorations
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Mechanical protection
If the remaining tooth structure is week or can't withstand the occlusal or condensation force
Therefore cavity base can help !!
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Dental Pulp Medication
In the case of pulp exposure we give
• Pulp capping
• Pulpotomy
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Materials placed between dentin (and sometimes pulp) and the restoration to provide pulpal protection or pulpal response.
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Is a solution of one or more resins dissolved in an organic solvent which when applied onto the cavity walls, the solvent evaporates leaving a thin film that serves as a barrier between the restoration and dentinal tubules
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Applied by using a brush or a small pledget of cotton
Composition: Natural gum such as copal, rosin, or synthetic resin dissolved in an organic solvent such as alcohol, acetone or ether. Fluoride is added to composition of some products
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Commercial products of cavity varnish
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The film thickness 2-5 µm.
Two application have been shown to be more effective than a single coat.
It has been used under amalgam and before cementation of indirect restorations with zinc phosphate cement.
Varnish should be confined to dentin
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Contraindications
• Direct resin composite restorations
• Glass- ionomer restorations
• Indirect ceramic and resin composite restorations
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2. Cavity sealers
• A materials provide sealing as well as bonding at the interface between cavity preparation walls and restoration.
• Examples include: Adhesive bonding systems, resin luting cements and glass-ionomer luting cement.
• The film thickness 20-50 µm.
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Composition: suspensions of calcium hydroxide in an organic liquid such as methyl ethyl ketone or ethyl alcohol .
One-paste light-cure
system
Two-paste chemical
cure system
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Other types of liners
• Type III GIC
• Type IV ZOE
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A material of minimal thickness (1 to 2mm) to replace missing dentin, used for :
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Examples of Cavity Bases
Glass ionomer and Resin-modified glass-ionomer cement,
Zinc phosphate cements
Zinc polycarboxylate cement
Zinc-oxide Eugenol Cement
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Glass Ionomer Cement:
• Anti cariogenic effect due to fluoride release
• Chemically bonded to tooth structure
• Good physical properties
• Biocompatible to dentin/pulp complex
Advantages
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Composition
o Powder
Acid soluble calcium fluroalumino silicate glass
o Liquid
1.Polyacrylic acid in the form co-polymer with
itaconic acid & malice acid .
2. Tartaric acid : improves handling
characteristic
3. Water : Medium of reaction & hydrates the reaction products
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Setting Reaction
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Vitrabond Light cure Glass Ionomer Liner/ Cement, 3 M ESPE, USA
Glass Ionomer Products
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Self-Cured, Glass Ionomer Lining Cement, GC America
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GC Fuji LINING™ LC (Paste Pak) Radiopaque Lining Material
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Zinc Phosphate Cement
More than 100 years ago, a French
architect proposed the use of zinc oxide as a stopping medium for carious teeth.
Zinc phosphate cement has progressively
advanced from the original wall plaster
that induced its development over a century ago.
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Zinc Oxide Eugenol
• They are cements of low strength
• They are the least irritating of all dental
• They have an obtudant effect on exposed dentin
Zinc Oxide Eugenol (ZOE) cement have been used extensively in dentistry since 1890s
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Classification
• Type I ZOE : For temporary cementation
• Type II ZOE : Permanent cementation
• Type III ZOE : For temporary filling and cement base
• Type IV ZOE : Cavity liners
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ZOE cement is available as
Powder and liquid System
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Composition and setting reaction
ZOE is a material created by the combination of zinc oxide and eugenol contained in oil of cloves.
An acid-base reaction takes place with the formation of zinc eugenolate chelate
The reaction is catalyzed by water and is accelerated by the presence of alcohol and glacial acetate.
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Two - Past System
Equal lengths of each past are dispersed and mixed until a uniform color is observed
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Modified ZOE Cements
The modified ZOE cements are as follows
EBA – alumina modified cement
Polymer reinforced ZOE cement
These were introduce to improve the mechanical properties of ZOE cements
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This cement features a reinforcing polymer incorporated into the powder
Reinforced ZOE Cement Products
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Clinical judgments about the need for specific liners and bases are linked to:
2. Considerations of adhesive materials.
3. The type of restorative material being used.
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Pulp medication
Liner are also formulated to provide pulpal medication . Main aspects are
1. Relief of pulpal inflammation
2. Facilitation of reparative dentin formation for physiologic protection
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Thank You