Dental Materials

Home

Get App

Create

_____ ______ establish micromechanical retention with enamel and or dentin by adapting to relief areas created by conditioning with ______ acid on teeth to get retention
- dentin resins
- phosphoric acid
BIS-GMA=

BISphenol a Glycidyl MethAcrylate
what are the six steps to bonding?
- 20 second etch on enamel and 10 on denth
- rinse
- dry (leave dentin moist)
- application
- air thin
- polymerization
t/f the dentin must be dry before bonding application

FALSE-leave dentin moist
what are two types of dentin resins
- BIS-GMA
- urethane dimethacrylate
light activated polymerization allows for what?

flexible working time
polymerization initiators are typically _____ ______ or a _____ ____
- benzoyl peroxide
- tertiary amine
what can be used to prevent contamination (hint rubber up)

Rubber Dam
what are bonding failures commonly due to?

contamination by saliva or oils
what must be done if contamination occurs at any step of the process?

RE ETCH
what removes tooth minerals to create porosity?

phosphoric acid
resin tags lock into the tooth to create why type of a bond?

mechanical
resin to ____ or resin to ____ will always be a _____ bond
- tooth
- metal
- mechanical
what type of bond does a composite resin have?

chemical
_____ to ______ will always be a chemical bond

resin to resin
____ _____ increases ability of liquids to wet tooth surfaces (what is this called?)
- acid etch
- wetting
t/f the etching time for primary teeth is 20-30 seconds

FALSE 60 seconds
how long should primary teeth be etched and why?
- 60 seconds
- enamel of primary teeth are amorphic (not regular)
what does amorphic mean?

not regular
how long should the dentin be etched for? (hint half of enamel)

10 seconds
what does longer etching time on the dentin do?

decreases bond strength and increases hypersensitivity
what happens to the matrix if the dentin is etched too long?

lays down flat and does not make mechanical bond
resin primer penetrates etched dentin and enamel creating a _____ bond and resin adhesive bonds ______ to primer
- mechanical
- chemically
what are the two components of bonding agents?
- primer
- resin adhesive
t/f primer is more important to enamel than dentin

FALSE more important to dentin than enamel
primer contains _______ groups to help bonding dentin why?
- hydrophilic
- because dentin is wet
what kind of bond is formed between primer and dentin?

mechanical bond
_____ _____ binds chemically to primer

resin adhesive
what kind of bond is created between resin adhesive and primer

chemical
resin adhesive contains ______ groups that chemically bond to composite resin

hydrophobic
what type of bond does resin adhesive have with metals/porcelain?

mechanical
t/f resin adhesive contains hydrophilic groups that chemically bond to composite resin

FALSE hydrophobic
t/f primer binds chemically to dentin

false mechanically
Resin to resin =?

chemical bond
resin to metal or porcelain=?

mechanical bond
what two things does resin mechanically bind to?
- tooth
- metal/porcelain
t/f dentinal bonding is stronger than enamel bonding (think about it! I.....am...going to....make you.........think)

FALSE enamel is stronger!
what happens if blood comes in contact with the tooth during bonding? what about saliva? or water? or snot?

Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch for 15 seconds
when you Re-Etch because of contamination how long must the etch be applied for?

15 seconds
what is the layer called that forms on the surface of cut dentin and enamel from cavity preparation with rotary or hand instrument?

smear layer
what is the smear layer composed of? (6)
- tooth structure
- plaque
- bacteria
- pellicle
- saliva
- blood
how is the smear layer removed?

rinse with waters
t/f the smear layer does not effect bonding

false- must be removed before bonding use water
t/f keeping dentin moist keeps the collagen fibers fluffed up

True (its so fluffy I could die)
if collagen fibers collapse they occlude the _____ _____, block penetration of _____ _____ _____, and results in dentin/resin interface ______
- dentinal tubules
- dentin bonding resins
- fracture
what is dissolved in resins to allow resins to penetrate through water and collagen fibrils into porosities created by etching

solvents
what is the job of a solvent in dentin bonding?

it is dissolved in resin to allow resin penetration through water and collagen fibers
what is the hybrid layer?

layer formed by dentin bonding resin and collagen fibrils
how is the bond between dentin and restorative material made?

through the hybrid layer
what is defined as leakage of fluids and bacteria between tooth and restoration?

microleakage
microleakage can cause? (6)
- decay under restoration
- tooth sensitivity
- shrinkage of composite resins
- unbound amalgam
- coefficient of thermal expansion (materials expand and contract with temp at different rates than tooth)
what results from microleakage ? (3)
- recurrent decay
- staining
- post operative sensitivity from percolation
the _______ extends into the dentinal tubule and reacts to pressure changes causing pain. What is this theory called?
- odontoblasts
- hydrodynamic theory of tooth sensitivity
what is the primary reason for tooth sensitivity following bonding procedures?

incomplete seal of the dentin
what are three contributing factors to hypersensitive teeth?
- over drying (traps air in tubules)
- dentin over etched (flattens collagen)
- composite cured in too large of increments (contraction stress on tooth)
what size increments can composite resins be laid in?

2mm
laying down small increments of composite lessens what?

hypersensitivity
etching dentin with phosphoric acid dissolves what to create porous surface?

hydroxy-apatite mineral
what are the three modes of curing?
- self cure
- light cure
- dual cure
______ is typically activated by fiber optic light

polymerization

Author

cassiedh

64061

Card Set

Dental Materials

Description

chapter 5 principles of bonding

Updated

2011-02-04T11:31:37Z

Show Answers