Op Tech Flashcards
WHAT ARE CAVITY MARGINS
junction between the prepared cavity wall and the external surfaces
WHAT IS THE CAVO SURFACE MARGIN ANGLE
the angle created at the point where a prepared cavity wall meets any external wall
should be 90 degrees in amalgam
should be an obtuse angle for composite
WHAT ARE POINT ANGLES
the angle formed by the junction of three surfaces
WHAT IS THE OCCLUSAL/PULPAL FLOOR
the floor of the cavity which is parallel to the occlusal plane
overlies the pulp
WHAT IS THE GINGIVAL FLOOR
the surface which is parallel to the occlusal plane in an interproximal cavity, bound externally by the gingival margin
WHAT IS THE PULPAL AXIAL WALL
the wall which is parallel to the long axis of the tooth
WHAT IS THE BUCCAL/LINGUAL AXIAL WALL
the wall which is parallel to the long axis of the tooth, bound by the occlusal floor and the cavo-surface margin angle
WHAT IS THE ISTHMUS
the least wide part of a key cut proximal-occlusal cavity preparation
WHAT IS A LINE ANGLE
where any two walls meet and create a line
WHAT ARE THE 2 CATAGORIES OF HAND INSTRUMENTS
cutting (cutting edge)
non-cutting (point)
WHAT ARE THE USES OF A STRAIGHT DENTAL PROBE / DENTAL EXPLORER / SICKLE PROBE
caries protection
point focus
surface testing and retraction
WHAT ARE THE FEATURES AND USES OF AN EXCAVATOR
spoon/ round
3 sizes
caries excavation
restoration shaping and contouring
material removal/manipulation
WHAT ARE THE USES OF A DENTAL MIRROR
intra-oral viewing
soft tissue retraction and protection
WHAT ARE THE USES OF TWEEZERS
handling small object
WHAT ARE THE TWO TYPES OF TWEEZERS
surgical locking
collage - we use
WHAT ARE THE USES OF A DENTAL CHISEL / HATCHET
enamel/cavosurface margin angle finishing
removing unsupported enamel prisms
WHAT ARE THE USES OF A FLAT PLASTIC
shaping flowable materials - comp and GI
WHAT ARE THE USES OF A CONDENSOR
condensing amalgam
manipulating composite
WHAT ARE THE USES OF A BURNISER
finishing amalgam
manipulating composite
WHAT ARE THE USES OF A CARVING ISNTRUMENT
carving amalgam
shaping composite
WHAT DOES THE COLOURED BAND ON A BUR INDICATE
diamond grit size
WHAT IS A YELLOW BAND ON A BUR
extra fine
WHAT IS THE RED BAND ON A BUR
fine
WHAT IS A BLU BAND ON A BUR INDICATE
standard
WHAT DOES WHITE BAND ON A BUR INDICATE
super fine
WHAT DOES A GREEN BAND ON A BUR INDICATE
coarse
WHAT DOES A BALCK BAND ON A BUR INDICATE
super coarse
WHAT IS THE USE OF A MATRIX BAND
replacing cavity walls
moisture control
WHAT IS THE USE OF WOODEN WEDGES
slight tooth separation to improve contact point formation
adapt the matrix band
when interproximal
WHAT IS THE COMPOSITE WE MAINLY USE
highly filled bis-GMA resin
hybrid
WHICH MATERIAL IS UNFILLED BIS-GMA
flowable composite
IDENTIFYING HAZARDS
bur in handpiece unsheathed needle blood outside spittoon instruments in sink but box open no paper towel on bracket table messy bracket table self curing materials in light wrong PPE over wearing gloves puddle cement on instruments endo files overflowing sharps tangled tubing lid off composite when not in use
FORMS OF GIC
powder and liquid
Fuji triage capsule
WHAT ARE THE USES OF A DENTAL DAM
airway protection field and chemical isolation better vision and access health and safety helps patient comfort and management
WHAT ARE DENTAL DAM RETAINERS
clamp
floss
wedges
widget cord
WHAT ARE DENTAL DAM RETAINERS
clamp
floss
wedges
widget cord
WHAT MATERIAL IS DENTAL DAM
nitrile
used to be latex but too much allergy
WHAT IS ALL THE DENTAL DAM EQUIPMENT
dam frame punch floss widget clamp scissors clamp forceps
WHY PULL THE FLOSS OUT BUCCALLY WHEN FLOSSING A DAM
as you can displace the dam pulling cervically
WHAT ARE THE PRINCIPLES OF CAVITY PREPARATION
access - enamel caries
extent - remove enamel caries to extent of lesion at ADJ = outline
remove dentinal caries - slow speed from ADJ inwards
remove deep caries over pulp - big slow instrument
modifications - cavo-surface angles
internal design modifications - line / point angles
final seal = smooth, no unsupported tissue, check over
WHAT IS THE CONFIGURATION FACTOR
the number of bonded surfaces in an adhesive restoration
high = lots of surfaces
WHAT IS CONFIGURATION STRESS
composite dimensional change
etch/bond stronger than interstitial enamel strength
enamel failure
WHY DO WE ETCH
to remove the smear layer - exposing dentinal tubules
WHY LEAVE SURFACES MOIST AFTER ETCHING
over drying dentine can cause post op sensitivity
WHY USE FLOWABLE UNDER A RESTORATION
mediate contraction stresses on interface
achieve optimal adaption to non load bearing surfaces
WHAT LIGHT CURING INTENSITY IS REQUIRED TO CURE 1.5-2MM DEPTH OF COMPOSITE RESIN
280-300mW/cm2
WHAT ARE THE SAFE TO USE CHECKS FOR HANDPIECES
check the coupling is secure
check the bur in secure in the handpiece
backcap cannot rotate
WHAT ARE THE FIT FOR USE CHECKS FOR HANDPIECES
no lateral movement of the bur
bur spins freely
check consistent sound for 5 seconds
HOW TO MIX FUJI
i. Open packet and activate capsule by pressing into bench until red portion is depressed into thr capsule
ii. Needs mixed to be activated for 10 seconds in the amalgamator
iii. Place capsule into the dispenser gum
iv. Inject into tooth keeping tip at bottom of cavity and filling until excess
v. Remove excess with flat intrument, remember and clean instrument or it will set
vi. Short working time with this material
vii. 3 setting stages
Now set so use articulation paper to double check occlusion
WHAT IS IN PRIME AND BOND
Bis-GMA and HEMA resin combined by an initiation system
acetone
camphorquinone
WHTA DO TO AFTER APPLIED BOND TO TOOTH
leave it for 20 seconds then use air to help dissolve the solvent for 5 seconds
WHAT MATERIAL SHOULD BE USED FOR TEMPORARY FILLINGS
RMGI
WHICH MATERIAL IS USED FOR A DIRECT PULP CAP
calcium hydroxide
WHICH MATERIAL IS USED AS AN INDIRECT PULP CAP
RMGI
when remaining dentine is thin
WHY WOULD YOU USE A PULP CAP (LINING)
for thermal insulation in amalgam
for the chemical toxicity in unset resin in composite
when pulp is exposed or nearly
WHAT FORM IS CALCIUM HYDROXIDE
powder and liquid
spatulate
HOW DOES THE PULP CAPPING WORK
do calcium hydroxide direct pulp cap
set
do RMGI indirect pulp cap
WHAT KIND OF CURE IS RMGI
Acid base
light cure = dual
Light cure and redox = tri
ORDER OF CLEANING DOWN A DENTAL UNIT
PPE gloves and apron
- Light , head rest
- Fabric of chair
- Arm rests
- Partition between unit
- Bracket table handpiece
- Motors handpiece
- Cables
- Housing for handpiece
- Spitoon
