Quiz 4 Flashcards
What is the smear layer composed of?
A very thin layer of debris remaining on the dentin after cavity preparation.
The smear layer is formed during the preparation of the tooth and can affect bonding.
Where is a dental liner placed?
In the deepest area of the tooth preparation.
A dental liner should not be placed on enamel or retentive grooves of the preparation.
Dental bonding is also referred to as?
Dental adhesion.
Dental liners and desensitizers serve different purposes in restorative dentistry.
ZOE mixed to a base consistency should not be?
Rolled into a one large ball.
ZOE should be mixed and rolled into two small balls for easier placement.
A necessary step in preparation for dentin bonding is the application of?
An etchant and removal of the smear layer.
The etchant helps prepare the tooth surface for bonding materials.
True or False: The tooth must be thoroughly dried before applying etchant material.
False.
The tooth should be dried lightly; however, care must be taken not to desiccate it.
Which base would you select for a deep cavity preparation that is uncomfortable due to extensive caries?
Zinc oxide–eugenol.
ZOE contains eugenol, which soothes a traumatized pulp.
Why is calcium hydroxide liner frequently used?
Stimulates production of reparative dentin.
It is used with all types of restorative materials and acts as a thin liner.
Desensitizers should be used to seal all affected dentinal tubules to help prevent hypersensitivity.
True.
Desensitizers should be applied carefully and should not come into contact with soft tissues.
Insulating base material should cover the entire _______ to a thickness of _____ mm.
pulpal floor; 1 to 2.
This thickness helps protect the pulp from thermal changes.
Calcium hydroxide cannot be placed under direct composite resins because it will inhibit?
Polymerization.
Calcium hydroxide is a liner, not a base, and is used for pulpal protection.
A properly etched tooth will appear?
Frosted.
An etched tooth should have a rough appearance, not shiny or translucent.
Zinc phosphate cement should be mixed on a?
Cool glass slab.
This is due to the exothermic reaction during mixing.
Which base needs to set at least 5 minutes before placing the restoration?
Polycarboxylate cement.
This setting time is important for proper adhesion.
Which of the following is the most concentrated type of fluoride on the market?
Fluoride varnish.
Fluoride varnish has a concentration of 5% or 22,600 ppm fluoride.
Varnish should be placed in?
Two light coats after a sedative base.
This method ensures effective sealing without interfering with the base.
Failure to place a protective base under a restoration can result in?
Postoperative sensitivity and damage to the pulp.
Protective bases are crucial for preventing sensitivity.
How long is the etchant material applied to the tooth?
15 to 20 seconds.
This is the most common recommended time by manufacturers.
An example of enamel bonding is the placement of a?
Dental sealant.
Sealants are used to bond to enamel surfaces effectively.
You are asked to select a protective base that releases fluoride under a composite restoration. Which would you select?
Glass ionomer.
Glass ionomer has excellent adhesion and releases fluoride.
Etching for dental bonding is done with?
Phosphoric acid.
Phosphoric acid is the standard etchant for preparing dental surfaces.
Dental varnish is used in the cavity preparation to?
Seal dentinal tubules and reduce leakage around a restoration.
It acts as a barrier to protect against acidic cements.
Varnish should be placed on the ______ of the tooth cavity preparation.
Walls, floor, and margins.
Varnish ensures comprehensive coverage of the preparation.
A desensitizer could be indicated for which of the following procedures?
Amalgam restoration.
Desensitizers are specifically used with amalgam materials.
Materials that are versatile in their uses for specialized dental bases include?
Dental cements.
Cements can be used as bases under permanent restorations.
An example of a biological pulpal stimulus is?
Bacteria from saliva coming into contact with pulpal tissues.
Biological stimuli can lead to pulpitis if not addressed.
All of the following statements are true of the process of removing the smear layer in dentin bonding except?
All moisture must be removed to assist in adhesion.
A small amount of moisture must be maintained to avoid damaging the tooth structure.
Patients may feel sensitivity after the placement of a restoration:
At any time.
Sensitivity can occur immediately or develop later.
Bonding agents or adhesives work best on?
Slightly moist dentin.
Moist surfaces provide better bonding due to increased surface area.
What is the purpose of etchant in the bonding process?
Etchant removes the smear layer in preparation for bonding.
The smear layer is a thin layer of debris that can inhibit bonding.
True or False: A varnish is always used before other materials.
False
A varnish is placed after the liner when used.
What is the correct order of material placement for amalgam when decay has extended into or close to the pulp?
Liner, base, varnish or desensitizer, etching/bonding system.
This order ensures proper protection and bonding.
Which material is the choice as an insulating base and a sedative base?
Zinc oxide–eugenol cement.
Zinc phosphate and polycarboxylate are excellent insulating bases but do not serve as sedatives.
What type of pulpal stimuli may be associated with traumatic occlusion?
Mechanical.
Mechanical stimuli arise from vibrations or stress on the tooth.
Which material is preferred as an insulating base under a composite restoration?
Glass ionomer.
Glass ionomer provides fluoride release and bond strength, making it suitable for composites.
What are the types of pulpal stimuli that result from thermal changes?
Physical.
Physical stimuli include hot and cold sensations affecting the pulp.
When should desensitizer be placed?
After rinsing and lightly drying the tooth.
This ensures proper application without overdrying the tooth.
Which statement about the bonding process is true?
Avoid overdrying or desiccating the tooth; the product works best on a slightly moist tooth structure.
Overdrying can harm bonding effectiveness.
Fill in the blank: Bonding agents are available as _____, light-cured, or dual cured.
self-cured.
Self-cured bonding agents do not require light activation.
What is the main function of bonding agents?
To create a strong bond between restorative materials and tooth structure.
Effective bonding enhances the longevity of restorations.
What is the effect of too much bonding material?
It is better than too little.
Multiple layers of bonding material can improve adhesion.
