Quiz #2-CavityClass, Bonds, n Stuff Flashcards
Which Class??? All pit and fissure cavities on the occlusal surfaces of premolars and molars
Class I
Which Class??? Cavities on the occlusal 2/3 of the facial and lingual surfaces of molars
Class I
Which Class??? Cavities on the lingual surfaces of maxillary incisors
Class I
Which Class??? Cavities on the proximal surfaces
of premolars and molars
Class II
Which Class??? Cavities on the proximal surfaces of incisors and canines that do not involve the incisal angle
Class III
Which Class??? Cavities on the proximal surfaces of incisors and canines that involve the incisal angle
Class IV
Which Class??? Cavities on the gingival 1/3 of the facial and lingual surfaces of all teeth
Class V
Which Class??? Cavities on the incisal edge of anterior teeth or on the occlusal cusp heights of posterior teeth
Class VI
What substance forms the bond between the inorganic filler and the organic oligomer during setting?
Coupling Agent
What is the name of our coupling agent?
SiLanes
A coupling agent must form a bond between the inorganic _______ and the organic _______ during setting.
filler….oligomer
In a coupling agent reaction: The surface of the filler is treated with a coupling agent _______ mixing with the oligomer.
BEFORE
Coupling Agents: During the setting of the oligomer the double bonds of the silane react with the oligomer to form a _____ from the filler through the coupling agent to the oligomer to the _________.
LINK!!…polymer matrix
What is the most common photo initiator (most common photo-absorbing material)?
Camp-hor-quin-one
What color light does CampHorQuinOne absorb? What is the wavelength in nm?
BLUE! 460-470 nm
Unreacted double bonds may be as high as 75% at the ____ inhibited _______ layer.
AIR….SURFACE
Polymerization Shrinkage: Bond failure at the _______. This allows in flux of oral ______, marginal ______, secondary _______, and post op ________.
Interface…fluids, staining, caries, sensitivity
What is a DIRECT function of the volume fraction of polymer in the composite.
Polymerization Shrinkage
________ composite has a higher volume % of polymer = more shrinkage
Microfilled
________ composite has less polymer matrix and may be stiffer but has less shrinkage.
MicroHYBRID
Microfilled has more ______ present = more EXPANSION
POLYMER
What type of composite do you choose if you are concerned about ESTHETICS? What types of areas do you place this in?
MICROFILLED composite…NON stress bearing
What are the 4 major components of a composite material?
1.Organic Polymer Matrix 2. Inorganic filler particles 3.Coupling agent 4.Initiator-accelerator system
What are the three Oligomers (organic polymer matrices)?
1.Bis-GMA 2.U-DMA 3.TEG_DMA
In the coupling agent, which end attaches to the matrix? Which end attaches to the filler?
Matrix> C=C…Filler>the 3 methoxy groups
Wait, which layer has the inactivated C=C again? Like what % of them might be unreacted during the polymerization process?
haha the SURFACE layer lolzz…like totes 75% unreacted
________ composites have Elastic Modulus (stiffness) value of only 1⁄4 to 1⁄2 that of more highly filled ______ composites.
Microfilled…Fine particle
What is the layer of debris (organic and inorganic material) that forms onto the enamel and dentin when prepared with rotary instruments?
SMEAR layer
_______: strong acid solutions, also called conditioners.
Etchants
Adhesives: Hydro______, dimethacrylate oligomers compatible with the _____ and __________ (Bis-GMA, TEG-DMA, U-DMA).
hydrophobic….primer… composite monomers
Initiators and Accelerators: Light cured activator _________ and __________.
Camp-Hor-Quin-One….Organic Amine
Filled Bonding Agents’s may have ______ bond strength.
HIGHER!
What are two “other” ingredients in bonding materials that have AWESOME properties?
1.Flouride 2.Antimicrobials (Gluter-Aldehyde)
Enamel bonding has ______ and ______ tags formed on etching with _______ acid gel.
Macro and micro…phosphoric acid
BIG term he said a bunch: Enamel bonding: Microtags are more numerous and contribute most to __________ retention
MICRO-MECHANICAL
In enamel bonding, what two substances flow into the irregular areas of the enamel and composite?
Primer and Adhesive (they form the macro and micro tags)
What are the 3 procedures of DENTIN bonding? PLEASE DONT GET THIS WRONG :)
Etching, Priming, Bonding
Interesting: Remember: dentin is almost ___% water making its surface strongly hydrophilic The goal is to produce _______ for micro-mechanical retention
25%….microtags
What are the two substances removed during dentin etching?
the SMEAR layer and a small amount of HydroxyApatite
**Care must be taken after etching to prevent ______ of the dentin surface to keep the ________ layer from collapsing on itself. SEAWEED analogy!
drying…. collagen sponge
The process of impregnation of the etched dentin by the resin in the PRIMER is called: the __________ formation.
The hybrid layer formation
What is this describing (tooth substance and attachment substance)? The hybrid layer may vary in thickness. If this zone is not fully impregnated with _______, a space may create a mechanically weak zone.. _______ have solvents to enhance wetting and carry the monomers into the tags. Several layers of the _______ may be needed to carry the monomers deep as the solvent evaporates.
Priming of the Dentin
A primer is a _______ monomer. It has hydrophilic _______ and hydrophobic _______.
BIFUNCTIONAL…collagen…resin
What is an example of a bifunctional primer (hydrophilic collagen and hydrophobic resin)?
HEMA
Self-Etch (Two-Step): Combined _______ and _______.The second step is then _______.
Conditioner and primer….adhesive
Big concept again: Most bonding is a result of _________ retention.
micro-mechanical
Currently, best bonding takes place on a ______ surface and agents containing ____ and _____.
moist!…MDP and EtOH
WHAT IS IRRADIANCE?
of photons per second emitted by light source per unit area of curing tip
What is ENERGY DENSITY?
Irradiance x time
YOU READY DAWG?? What are the 5 factors for how long it will take to adequately cure your composite with a light?
1.Energy Denisty (irradiance x time) 2.distance from composite 3.collimation of light 4.wavelengths (emitted and absorbed) 5.composite type
Reciprocity of curing lights: the more irradiance = ____ amount of time.
LESS!
Reciprocity of curing lightsL the less irradiance = ____ amount of time.
MORE!
These will _______ curing time: owed irradiances, LED, Halogen, microfilm composites, darker shades, flowable composites, greater distances, poor collimation
INCREASE
Thes will _______ curing time: higher irradiances, Plasma arc, hybrid composites, lighter shades, close distance, good collimation
DECREASE
When in doubt of how long to cure the composite:
refer to the manufacturer’s guide!
Which part of the bur fits into the hand piece?
the SHANK yo
What connects the head of the bur to the shank?
the neck dawg
What is the working part of the dental bur?
the HEAD brotha
What shape of bur is a #6?
ROUND!
What shape is a 33 1/2?
Inverted cone
What shape is a 169L?
Taper
What shape is a 245?
long cylinder/straight fissure
a ______ angle= rake face ahead of the radius. it also minimizes _______ of the cutting edge.
a negative angle..fracture
increasing the clearance angle _______ the edge angle
decreases (and therefore makes the blade weaker
increasing the edge angle ________ the cutting edge
reinforces
Carbide burs generally have negative _____ angles and
_____ angles of about 90 degrees.
rake….edge
Without a coupling agent, your wear resistance is cut in _____!
HALF!
The microfills have ______ filler material then the micro hybrids.
LESS
The microfill has ______ polymer matrix then the micro hybrids.
MORE
A microfill is going to absorb _____ water then a micro hybrid. Because it has _____ polymer matrix and it is not as _____ of a surface then a micro hybrid.
MORE…more..hard
Composites have a _____ CTE then dentin or enamel.
HIGHER
CTE for microHybrid is ______ than the CTE for a microfilled because Microfilled has more ______ present = more expansion.
lower…polymer
