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65 Cards in this Set

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PRINCIPAL CONSTITUENT OF A CAST
CALCUM SULFATE DI-HDYDRATE CaS04 .2H2O
PRINCIPAL CONSTITUENT OF CAST USE IN LAB.
CALCIUM SULFATE HEMI-HYDRATE
CaS04. 1/2 H2O
WHERE WAS CaS04. 2H2O ORIGINALLY MINED? HOW WAS CaS04. 1/2H2O PRODUCES
1. OUTSIDE OF PARIS
2. BURING CaSO4. 2H2O
REACTION FOR CaSO4. 2H2O TO PRODUCE CaSO4.1/2H2O
CaSO4.2H2O + HEAT(110-130 DEGREE) __________> CaSO4.1/2H2O
2 TYPES OF CALCIUM SULFATE HEMIHYDRATE
1. ALPHA HEMIHYDRATE
2 . BETA HEMIHYDRATE
A CALCIUM SULFATE HEMIHYDRATE WHICH IS A DENTAL STONE AND MORE DENSE W/ PRISMATIC SHAPE
ALPHA HEMIHYDRATE
A CALCIUM SULFATE HEMIHYDRATE WHICH IS A DENTAL PLASTER CONTAIN A IRREGULAR SHAPE AND IS SPONGINESS
BETA HEMIHYDRATE
WHAT OCCUR TO THE CALCUIM SULFATE HEMIHYDRATE WHEN IT PRECIPITATE OUT OF SOLUTION IN A SETTING REACTION
1. NEW CRYSTAL FORM
2. FURTHER GROWTH OF ALREADY PRESENT CRYSTAL( NUCLEI OF CRYSTALLIZATION
HOW DOES CRYSTAL CREATES AN OUTWARD STRESS OR THRUST CAUSING A MASS EXPANSION
CRYSTALS GROWING OUT FROM NUCLEI INTERMESH W/ AND OBSTRUCT ADJACENT CRYSTAL
TRUE OR FALSE: MORE CRYSTAL NUCLEI CAUSES FASTER REACTION
TRUE
TRUE OR FALSE: ALL GYPSUM PRODUCTS EXPAND DURING SETTING
TRUE
TYPES OF GYPSUM
1. CALCUIM SULFATE DI-HYDRATE
2. CALCUIM SULFATE HEMI-HYDRATE
EFFECT INCREASING WATER:POWDER RATION HAVE ON SETTING TIME? 2. NUCLEI PER UNIT VOLUME
1. INCREASE SETTING TIME
2. FEWER NUCLEI PER UNIT VOLUME
WHAT HAPPEN TO SETTING TIME IF WATER TEMPERATURE INCREASE UP TO (50 C OR 150F)
DECREASES SETTING TIME
WHAT HAPPEN IF HEMIHYDRATE SETTING TIME INCREASES
HEMIHYDRATE GOES INTO SOLUTION FASTER
1. WHAT HAPPEN TO HEMIHYDRATE IF REACTION IS ABOVE 50 C ? 2. 100 C ?
1. SLOW THE REACTION
2. NO REACTION TAKE PLACE
1. WHAT HAPPEN TO SETTING TIME IF MIXING TIME OR SPATULATION INCREASE? 2. WHAT HAPPEN TO NUCLEI OF CRYSTALLIZATION
1.DECREASE SETTING TIME
2. FORMED CRYSTALS ARE BROKEN UP THUS INCREASES NUCLEI
1. EFFECT OF ADDING A SLURRY OF GROUND GYPSUM HAVE ON SETTING TIME 2. NUCLEI ?
1. DECREASE SETTING TIME
2. INCREASE NUCLEI OF CRYSTALLIZATION
WAY(S) MANUFACTURER'S CAN RETARD OR ACCELERATE SETTING TIME
BY ADDING CHEMICALS
A STRENGTH WHICH OCCUR WHEN THERE IS EXCESS WATER THAN THAT REQUIRED FOR HYDRATING OF HEMIHYDRATE STILL IN SPECIMEN
WET OR GREEN STRENGTH
A STRENGTH WHICH OCCUR WHEN A GYPSUM IS DRIED OF ALL EXCESS WATER AND FORM FINE CRYSTAL WHICH HELP ANCHOR LARGE CRYSTAL
DRY STRENGTH
A STRENGTH WHICH MORE THAN DOUBLE WET STRENGTH AND IS REVESIBLE BY WATER DISSOLVING THE FINE CRYSTALS ANCHORING THE LARGER CRYSTAL
DRY STRENGTH
EFFECT OF STRENGTH, IF WATER: POWDER RATION INCREASES
STRENGTH DECREASE: FEW CRYSTALS PER UNIT VOLUME
EFFECT OVER MIXING (FORMED CRYSTALS ARE BROKEN UP AND LESS INTERLOCKIN) CAN HAVE ON STRENGTH
DECREASE STRENGTH
TYPES OF GYPSUM PRODUCTS
1. PLASTER IMPRESSION I
2. PLASTER MODEL II
3. DENTAL STONE III
4. DENTAL STONE W/ HIGH STRENGTH IV
5. DENTAL STONE W/ HIGH STRENGTH AND HIGH EXPANSION V
A GYPSUM PRODUCT SOMETIME DESIGNATED AS CLASS I STONE OR HYDROCAL
DENTAL STONE:TYPE III
A GYPSUM PRODUCT SOMETIME DESIGNATED AS CLASS II STONE, DENSITE OR IMPROVE STONE
DENTAL STONE W/ HIGH STRENGTH: TYPE VI
WAY(S) POROSITY INCREASE
1. INCREASING WATER:POWDER PER UNIT RATIO
2. FEW CRYSTAL UNIT PER VOLUME
A GYPSUM 4X LESS SOLUBLE THAN HEMIHYDRATE BUT STILL SOLUBE
DI-HYDRATE
EFFECT ON SETTING EXPANSION IF WATER:POWDER RATIO INCREASES
DECREASE SETTING EXPANSION
EFFECT ON SETTING EXPANSION IF WATER:POWDER RATIO DECREASE
INCREASE SETTING EXPANSION
WHAT IS HYDROSCOPIC EXPANSION
?
A GOOD RULE FOR GYPSUM PRODUCTS
FOLLOW THE MANUFACTURER'S INSTRUCTION
A INSTRUCTMENT WHICH TRIM CAST
CAST OR MODEL TRIMMER
STEPS IN WHICH CAST CAN BE TRIM
1. COMPLETE ROUGH TRIM OF THE PERIPHERY
2. TRIM BASE
2 DESIGNS FOR CAST TRIMMING
1. TRADITIONAL FACETED SIDES
2. ROUND SIDES
TRUE OR FALSE: SOME FACTORS ARE COMMON TO BOTH DESIGNS IN CAST TRIMMING
TRUE
A PART OF CAST THAT IS TRIMMED FOR THE UPPER AND LOWER CAST TO PARALLE THE PLANE OF OCCLUSION
BASE
FACTORS COMMON TO BOTH CAST DESIGN
1. UPPER AND LOWER BASE SHOULD BE PARALLEL TO PLANE OF OCCLUSION
2. CAST ARE ALWAYS TRIMMED SYMMETRICALLY IN BOTH DESIGN
3. POSTERIORLY THE CAST ARE TRIMMED PERPENDICULAR TO A SAGITTAL PLANE
4. LOWER: TRIM UP TO RETROMOLAR PAD
5. UPPER: TRIM UP TO TUBEROSITY
NUMBER OF SYMMETRICAL FLAT FACETS ON UPPER TRADITIONAL CAST DESIGN
SEVEN
NUMBER OF SYMMETRICAL FACETS ON LOWER TRADITIONAL CAST DESIGN
1. FIVE FLAT FACETS
2. ONE ROUND
SIX TOTAL
A CAST DESIGN WITH NO FLAT FACETS
ROUND SIDE DESIGN
A CAST DESIGN TRIM TO BE EQUIDISTANT FROM THE FACIAL SURFACES OF THE TEETH
ROUND SIDE DESIGN
A PORTION OF THE CAST WHICH SHOULD BE BEVELED
JUNCTION OF THE ANATOMIC AND LAND
1.TECHNIQUE AND 2. INSTRUCTMENT USE TO BEVEL JUNCTION OF ANATOMIC AND LAND CAST
1. PALM GRIP W/ GOOD THUMB REST
2. SCALPEL
COMMON LOCATIONS FOR BUBBLES ON A CAST
1.TEETH
2. SOFT TISSUES
LESS SOLUBLE GYPSUM
DI-HYDRATE
TIME FROM ADDITION OF POWDER TO WATER UNTIL MIXING IS COMPLETE IN STONE PREPARATION
MIXING TIME
A MIXING TIME FOR MECHANICAL SPATULATION
20-30 SECOND
A MIXING TIME FOR HAND SPATULATION
1 MINUTE
TIME AVAILABLE TO USE A WORKABLE MIX ( POURING AN IMPRESSION AND CLEAN THE EQUIPMENT)
WORKING TIME = 3 MINUTES
TIME FROM BEGINNING OF MIXING UNTIL THE MATERIAL HARDENS (DENTAL STONE)
SETTING TIME
2 TYPES OF SETTING TIME
1. INITIAL SETTING TIME
2. FINAL SETTING TIME
TIME WHEN LOSS OF GLOSS OCCUR IN AN INITIAL SETTING TIME
~9 MINUTES
A TEST IN THE INITIAL SET WHEN NEEDLE NO LONGER LEAVES AN IMPRESSION IN THE STONE
GILMORE TEST
TIME GILMORE TEST WILL OCCURE
~ 13 MINUTES
A TEST IN A FINAL SETTING TIME WHEN HEAVIER NEEDLE BARELY LEAVES A MARK ON THE STONE
GLIMORE TEST
WHEN IS A MATERIAL NOT STRONG ENOUGH TO REMOVE FROM THE IMPRESSION
SETTING TIME
TRUE OR FALSE: FIRST POUR SHOULD REACH INITIAL SET BEFORE SECOND POUR IS ADDED USE LOSS OF GLOSS TEST
TRUE
MINUTES WAIT BEFORE SEPARATING CASTS FROM THE IMPRESSION
AT LEAST 30 MINUTES
TRUE OR FALSE: TRIM CASTS SOON AFTER THE 30 MINUTES
TRUE
IF A STRENGTH OF A STONE CRITICAL WAIT MORE THAN ONE HOUR PREFERABLY TRIM
AFTER STONE IS DRY ~24 HOURS
PROPERTIES OF GYPSUM
1. SETTING AND WORKING TIME
2. STRENGTH
3. POROSITY
4. EXPANSION
5. SOLUBILITY
WHAT CAN BE MANIPULATED IN PREPARATION OF GYPSUM
1. WATER AND POWDER RATIO
2. WATER TEMPERATURE
3. MIXING TIME
TRUE OR FALSE: A MASS OF STONE MAY MORE THAN DOUBLE IN STRENGTH AFTER ONE WEEK
TRUE