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45 Cards in this Set
- Front
- Back
NATURAL WAX:
4 KINDS |
⋅ MINERAL
⋅ PLANT ⋅ INSECT ⋅ ANIMAL |
|
DENTAL WAX:
3 CLASSES |
⋅ PATTERN
⋅ PROCESSING ⋅ UTILITY |
|
[MINERAL] WAXES
derived from BOILED PETROLEUM |
PARAFFIN WAXES
|
|
[MINERAL] WAXES
derived from HEAVY PETROLEUM (higher melting ranges than paraffin waxes) |
MICROCRYSTALLINE WAXES
|
|
MELTING RANGE
for PARAFFIN WAXES |
40 - 71ºC
|
|
MELTING RANGE
for MICROCRYSTALLINE WAXES |
60 - 91ºC
|
|
DENTAL WAXES:
6 COMPONENTS |
⋅ NATURAL & SYNTHETIC WAXES
⋅ FATS ⋅ GUMS ⋅ OILS ⋅ RESINS ⋅ PIGMENTS |
|
a MICROCRYSTALLINE [MINERAL] WAX
added to PARAFFIN WAXES to INCREASE MELTING RANGE & HARDNESS, REDUCE FLOW |
BARNSDAHL
|
|
an EARTH [MINERAL] WAX
found NEAR PETROLEUM DEPOSITS (melts @ 65ºC) |
OZOKERITE
|
|
very HARD [MINERAL] WAXES
derived from REFINED PETROLEUM, added to PARAFFIN WAXES to INCREASE MELTING RANGE |
CERESIN WAXES
|
|
HARD, BRITTLE, LUSTROUS [MINERAL] WAXES
extracted from LIGNITES (properties similar to those of plant waxes) added to PARAFFIN WAXES to IMPROVE HARDNESS & MELTING RANGE |
MONTAN WAXES
|
|
SETTING EXPANSION RANGE
for DENTAL STONE |
0.08 - 0.1%
|
|
SETTING EXPANSION RANGE
for IMPROVED STONE |
0.05 - 0.07%
|
|
preparing GYPSUM MATERIALS:
INCREASED H₂O (thin mix) ↧ ________ EXPANSION, ________ SETTING TIME, & ________ COMPRESSION STRENGTH (HIGHER or LOWER?) |
REDUCED EXPANSION,
INCREASED SETTING TIME, & LOWER COMPRESSION STRENGTH |
|
preparing GYPSUM MATERIALS:
REDUCED H₂O (thick mix) ↧ ________ EXPANSION, ________ SETTING TIME, & ________ COMPRESSION STRENGTH (HIGHER or LOWER?) |
INCREASED EXPANSION,
REDUCED SETTING TIME, & HIGHER COMPRESSION STRENGTH |
|
preparing GYPSUM MATERIALS:
adding NaCl (=salt ) ↧ ________ EXPANSION, ________ SETTING TIME (INCREASED or REDUCED?) |
INCREASED EXPANSION,
REDUCED SETTING TIME |
|
preparing GYPSUM MATERIALS:
INCREASED SPATULATION (overspatulation) ↧ ________ EXPANSION ________ SETTING TIME (INCREASED or REDUCED?) |
INCREASED EXPANSION,
REDUCED SETTING TIME |
|
preparing GYPSUM MATERIALS:
INCREASED TEMPERATURE (room or H₂O) ↧ ________ SETTING TIME (INCREASED or REDUCED?) |
REDUCED SETTING TIME
|
|
preparing GYPSUM MATERIALS:
HUMIDITY ↧ ________ SETTING TIME (INCREASED or REDUCED?) |
REDUCED SETTING TIME
|
|
COMPRESSION STRENGTH
of SET GYPSUM MATERIALS |
8000 psi (lbs/in²)
= 55 MPa (MegaPascals) |
|
When GYPSUM MATERIALS SET,
all excess H₂O is lost in ________ hrs. |
24-48 HRS.
(7 days in flask) |
|
HARD, BRITTLE [PLANT] WAXES
w/ HIGH MELTING TEMPS (84 - 91ºC) obtained from the LEAVES of a PALM added to PARAFFIN WAXES to INCREASE MELTING RANGE & HARDNESS |
CARNAUBA WAXES
(& OURICURY WAXES) |
|
HARD [PLANT] WAXES
derived from the LEAVES OF A SHRUB added to PARAFFIN WAXES to INCREASE HARDNESS |
CANDELILLA
|
|
a TOUGH, MALLEABLE, STICKY [PLANT] FAT
derived from the BERRIES of some SUMACS added to PARAFFIN WAXES to IMPROVE TACKINESS & EMULSIFYING ABILITY |
JAPAN WAX
(a byproduct of lacquer manufacturing) |
|
a BRITTLE, EMOLLIENT [PLANT] FAT
extracted from COCOA BEANS used as a MOISTURE BARRIER (can provide PROTECTION from DEHYDRATION, TEMPORARY PROTECTION from MOISTURE) |
COCOA BUTTER
(= theobroma oil) |
|
BEESWAX
is the MAIN COMPONENT of ________ WAX |
SITCKY WAX
|
|
an ANIMAL WAX
obtained from the SPERM WHALE used to COAT DENTAL FLOSS |
SPERMACETI
|
|
a NATURAL RESIN
w/ THERMALLY INSULATING PROPERTIES used by dentists as a LINER for PREPARED CAVITIES |
COPAL
|
|
a PATTERN WAX (ADA SPEC. #4)
composed of 60% PARAFFIN + 25% CARNAUBA + 10% CERASIN + 5% BEESWAX |
INLAY WAX
|
|
a slightly TACKY PATTERN WAX
of unknown composition used for DENTURE FRAMEWORK PATTERNS, CHECKING BITES, & ARTICULATION available in 28- & 30-GAUGE SHEETS, READY-MADE SHAPES |
CASTING WAX
|
|
typical COMPOSITION
of BASEPLATE WAX |
70-80% PARAFFIN
+ 10% CERASIN + 5% BEESWAX |
|
BASEPLATE WAX:
# of TYPES |
3
|
|
TYPE I BASEPLATE WAX:
firmness |
SOFT
|
|
TYPE II BASEPLATE WAX:
firmness |
MEDIUM or HARD
|
|
TYPE III BASEPLATE WAX:
firmness |
HARD or EXTRA-HARD
|
|
TYPE I BASEPLATE WAX:
use |
BUILDING CONTOURS & VENEERS
|
|
TYPE II BASEPLATE WAX:
use |
IN-MOUTH PATTERNS
(TEMPERATE WEATHER) |
|
TYPE III BASEPLATE WAX:
use |
IN-MOUTH PATTERNS
(HOT WEATHER) |
|
7 REQUIREMENTS
of BASEPLATE WAX |
⋅ MUST COHERE READILY
⋅ MUST NOT IRRITATE ORAL TISSUE ⋅ MUST TRIM EASILY ⋅ MUST LEAVE NO RESIDUE ⋅ MUST HAVE A SMOOTH, GLOSSY SURFACE ⋅ ITS COLOR MUST NOT SEPARATE ⋅ MUST NOT STICK DURING STORAGE |
|
DIMENSIONS
of BOXING WAX (CARDING WAX) |
1½" x 12"
|
|
a SOFT, PLIABLE, ADHESIVE,
DARK RED PROCESSING WAX composed of BEESWAX, PETROLATUM, & other SOFT WAXES used for BEADING MODELS & BUILDING UP LOW AREAS |
UTILITY WAX
(BEADING WAX) |
|
an AMBER PROCESSING WAX
composed of BEESWAX & RESINS HARD & BRITTLE @ ROOM TEMP but very STICKY WHEN MELTED used to ASSEMBLE MODELS for ARTICULATION & for SOLDERING CROWNS |
STICKY WAX
|
|
an IMPRESSION WAX
used to REGISTER TISSUE DETAIL in a NORMAL (FUNCTIONAL) STATE |
CORRECTIVE WAX
|
|
an IMPRESSION WAX
used to REGISTER OCCLUSION |
BITE WAX
|
|
a PROCESSING WAX
w/ LOW MELTING POINT SOFT & TACKY WHEN HOT used to BLOCK OUT UNDERCUTS on MODELS & DIES |
BLOCK-OUT WAX
(UNDERCUT WAX) |