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