Dental Liners, Bases, And Bonding Systems Flashcards
Dental material categories
Intermediate
Supplementary
Intermediate
Includes liners, bases, and cement.
Supplementary
Includes bonding and restorative agents.
What stimuli can trigger an unfavorable response in the pulp?
Physical: electrical, thermal
Mechanical: trauma, hand piece
Chemical: dental material acid
Biological: saliva bacteria
Dental liners
This material is laid in a thin layer that protect support from irritation cause my biological, chemical, mechanical, and physical elements.
What is commonly used as a dental liner?
Calcium hydroxide
Indications for using calcium hydroxide
Pulp chemical irritation is avoided because of it stealing capabilities.
Secondary dentin production is stimulated.
It can be used with all types of restorative materials.
Placement of calcium hydroxide
Calcium hydroxide his place over the deepest portion of the Pulpo floor and only on dentin
Varnish
A liquid consisting of one or more reasons and an organic solvents apply to the internal preparation structure.
Varnish application process
Apply the varnish with a dry cotton pallet or micro brush.
Place a thin coating on the internal walls, floor, and margin of cavity preparation.
Allow the surface to air dry.
A second application is recommended.
What are the indications to place dentin sealer
Can be used for treatment or prevention of hypersensitivity.
Can be used as an alternative to varnish.
Can be used and dentinal tubal sealing.
Can be used under all indirect restorations.
What should you avoid when applying dentin sealer?
Do not apply too much material.
Avoid soft tissue contact.
Apply with a cotton tipped applicator.
Apply all over areas of exposed dentin.
Types of base minerals
Zinc oxide eugenol.
Zinc phosphate.
Polycarboxylate.
Glass ionomer.
Protective
Protects the pulp before large restoration
Insulating
Thermal shock protection
Sedative
Sooth pulp that has been irritated by decay or mechanical means
What are dental sealant also known as?
Desensitizers
Dental bonding
Create micromechanical retention between tooth structure and restoration
Bonding agent
Enables the removal of less tooth structure before definitive restoration placement because minimal retentive features are needed.
Direct bonding
Achieved by way of removal of the smear layer with etchant
Etching system
Used in smear layer removal to prepare for bonding.
Clinical applications for etching and bonding system:
Remove plaque and debris prior to the bonding process.
Remove the smear layer with the use of etchant.
Rinse and dry the tooth surface structure( avoid overseeing etched teeth.)
Cover all surfaces with bonding solution (too much bonding is better than too little)
Avoid contamination from saliva ( the entire procedure will need to be redone if contamination occurs.)
Allow for maturation of bonding material. (Maturation needs to occur before restoration is considered complete)
Enamel bonding
Used when a bind is needed in the intact enamel surface.
What is enamel bonding used for?
Orthodontic brackets, dental sealants, and resin bonded veneers and bridges.
For an amalgam filling with a deep cavity what should be placed first?
Base
Dental cements
This brittle material is made by mixing a liquid with a powder. It acts as a luring agent, protects or lines the cavity preparation.
Type 1 classification
Luting agents, temporary or permanent cements.
Type II Classification.
Restorative material, such as glass ionomer.
Type III classification
Liners or bases placed with cavity preparation.
Luting agents
Viscous material placed into dental prosthesis that secures the prosthesis securely to the tooth via chemical bonding.
Permanent cements
This is used to bond gold and ceramic restorations. Such as inlays, onlays, crowns, bridges, veneers, orthodontic fixed appliances.
Temporary cements
This is used until a restoration would need to be removed as a result of sensitivity or other symptoms. Also used for provisional coverage
Mixing
Before mixing, follow the manufacturers directions.
Measure the liquid and powder in the amount needed for use.
Separate the powder and liquid to make space for mixing.
Separate the powder into smaller portions.
When increment sizes vary, smaller increments are incorporated first.
Mix each portion of power into liquid and mix until consistent.
Humidity
Premature exposure to warm temp or humidity can result in too much moisture in the mix or not enough water in the liquid.
Powder to liquid ratio
Mixing incorrect amounts of water and powder will result in inconsistency
Temperature
Some cements undergo an exothermic reaction.
Types of cements:
Glass ionomer
Composite resin
Polycarboxylate
Zinc phosphate
Zinc oxide eugenol (ZOE)
Another type of cement, that comes as a paste or liquid.
ZOE liquid
Eugenol, H2O, acetic acid, zinc acetate, and calcium chloride
Powder ZOE
Zinc oxide, magnesium oxide, and silica
Type I ZOE (paste)
Recommended for temporary restorations due to lack of strength.
Type II ZOE (liquid/powder)
Used for permanent cementation of cast restorations due to strength and durability characteristics
Polycarboxylate cement
Also known as polyacrylic cement. This material can be used as a cement for cast restorations, an insulation base under amalgam, or as an intermediate restoration
Polycarboxylate liquid
Polycrylic acid, itaconic acid, maleic acid, tartaric acid, and water
Polycarboxylate powder
Zinc oxide
Glass ionomer liquid
Itaconic acid, tartaric acid, maleic acid, and water
Glass ionomer powder
Zinc oxide, aluminum oxide, and calcium
Glass ionomer type I
Used for cementing metal restorations and bonded orthodontic brackets
Glass ionomer type II
Used for class V restorations of areas or recession.
Glass ionomer type III
Designed for restoration liners or dentin bonding agents
Glass ionomer benefits:
The powder is made up of acid soluble calcium. The slow release of fluoride helps inhibit recurrent decay.
It is less irritating to the pulp than many other types of cement.
It has lower solubility in the mouth.
It adheres to a slightly moist tooth surface.
It allows easier seating of restorations because it has a thin film thickness.
What is composite resin used for?
Cement ceramic or resin onlays or onlays.
Cement porcelain or ceramic veneers.
Cement orthodontic bands.
Bond orthodontic brackets.
Cement all metal castings.
What instruments can remove cement?
Mouth mirror
Explorer
Excavator
Fulcrum
Dental floss
