| A | B |
|---|
| conventional composites | strength |
| which organic matrix = shrinkage | BIS-GMA |
| which filler is added to composite to produce radiopacity on an xray-film | barium |
| hybrids | strength from macrofills/beauty from microfills |
| microfilled | class III preparation` |
| Amine | activator |
| composite (Bis-GMA)resin matrix produce | shrinkage |
| base and catalyst must be mixed to a | homogenus mixture |
| shinest surface during polish | microfilled |
| self-cure | 2 minutes |
| the most popular curing light | light emitting diode (LED) |
| G.V. Black | perfected amalgams |
| study of dental materials | deals with properties/manipulation of materials |
| Pierre Fuchard | construction of dentures |
| ADA/FDA | establish standards of dental materials |
| dental materials or products are classified as | Class I, Class II, Class III |
| four classes of dental materials | composites, polymers, metals, ceramics |
| Class IIIdental products | very restrictive, require data |
| Class IIdental products | most dental materials must meet certain standards |
| Class I dental products | given to all dental devices, good manufacturing practices |
| to start a chemical reaction | 18.6 |
| calcium sulfate dihydrate | CaSo4 2H20 |
| condensation | by product of alcohol |
| example of a polymer | denture |
| study model art portion | base |
| water/powder ratio for plaster | 50ml/100grams |
| study model tissue portion | anatomy |
| changing calcium sulfate dihydrate/calcium sulfate hemihydrate | water is removed |
| water power ratio for die stone | 24ml/100grams |
| water sorption | absorb moisture |
| tarnish | discoloration/ and is reversible |
| corrosion | deterioration of metal an is irreversible |
| exothermic reaction | the production of heat |
| good wetting | ability of matierial to wet the surface |
| poor wetting | water beading up on a wax car |
| viscosity | ability of a liquid material to flow |
| microleakage | leakage of food and bacteria which is responsible for recurrent decay, staining, and sensitivity |
| coefficient of thermal expansion | measurement of contraction and expansion |
| bonding | fasten, connection |
| hue | dominant color |
| chroma | richness of color |
| value | how light or dark the color is |
| tranlucency | combination of opaque and transparent |
| opaque | light iscompetely absorbed |
| transparent | light passing through an object |
| strain | deformation and distortion |
| stress | change internal |
| esthetics | good looking |
| etching | preparaing the tooth /phosphoric acid |
| polymerization | chemical reaction of polymers |
| smear layer | debri as result of cavity prep |
| hydrophllic | loves moisture |
| hydrophobic | does not tolerate moisture well |
| macrofilled | large particle size add strength to the composite |
| microfill | small particle size add beauty to the composite |
| hybrid | combination of macro and micorfilledlllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll |
| fluoride | protects tooth from cavities |
| demineralization | removes mineral from the tooth |
| remineralization | replaces minerals to the tooth by using fluoride |
| fluorosis | excessive fluoride levels |
| chlorohexidine substantivity | prolonged effect after the initial dose |
| extrinsic stains | on the tooth surface |
| intrinsic stains | within the tooth |
| sealant | protective covering for pit and fissure |
| alginate | irreversiblle / not accurate for crown and bridge impression |
| agar | reversible / very accurate for crown and bridge impression |
| Class I cavity prep | pit and fissures |
| Class II cavity prep | posterior interproximal |
| class III cavity prep | anterior interproximal |
| class IV cavity prep | anterior interproximal including incisial angle |
| class V cavity prep | smooth surface close to gingiva |
| 3 types of masitication forces | shearing, tensile, compression |
| four classes of dental materials | metals, composites, ceramics, polymers |
| example of a metal | gold crown, , stainless steel crown |
| example of a polymer | denture, mouth guard, sealant |
| example of a ceramic | porcelain crown |
| disinfecting an alginate impression | spray with glutaraldehydes, seal in bag 10 min |
| galvanism | when two different metals touch |
| saliva | acts as a battery in the oral cavity to cause galvanism |
| composites are | a mixture of polyers and ceramics |
| chemical name for plaster is | beta-hemihydrate |
| Benzol Peroxide is an | initator in self cure composite |
| die stone particles are the | most dense |
| the dental vibrator cause the | air bubbles to rise to the top of a mixture |
| microfilled composites | can be polished smooth |
| macrofilled composites | difficult to polish |
| The ADA Seal | means the product is safe and effective and has undergone strict testing |
| hydrogen peroxide & carbamide peroxide | are essential in whitening products |
| most popular elastormer | polyvinylsiloxanes |
| the final impressions possess three key properties | accuracy, dimensional stability, and tear resistance |
| over tritruated amalgam looks | sticky and wet |
| composite is placed in increments no thicker than | 2.0 |
| dental impressions | allows the creation of a replica of the structures involved |
| advantage of composite vs amalgam is | thermal conductivity |
| what etch is used for composite and sealants? | phosphoric acid |
| Alginate | most widely used dental material |
| elastic impression material | polyether, polysulfied, condensation silicone, addition silicone |
| inelastic dental materials | Impression plaster, impression wax, ZOE |
| dental impression is a | negative reproduction of the teeth |
| example of items made from an alginate impression | bleaching tray, mouthguard, ortho retainer |
| polysulfides | oldest of the elastomers |
| adhesion | is a method of chemical retention |
| three types of forces | tensile, shearing, and compressive |
| solubility | porcelain has the lowest level |
| Composites are not | good conductors of temperature=poor thermal conductivity |
| smear layer | interferes with the formation of a bond to dentin |
| 37% phosphoric acid | = etch |
| the appropriate disinfection procedure for alginate is | spraying with cavicide and sealing in a bag |
| 1930 ADA awarded the first | ADA seal of acceptance |
| loss of gloss | is the initial setting of gypsum |
| Anatomic part of the diagnostic cast | records the hard and soft tissue |
| impressions | forms a negative form of the impression |
| the study model or diagnostic cast | forms a positive replica of the teeth an tissue |
| composite is a | direct placement esthetic material |
| polyether | stiffest of the elastomers |
| when using agar you will burn the patient's tissue | if you do not place agar in the last bath |
| pouring plaster into an impression | produces a positive impression |
| composites are mixtures of | polymers and ceramics |
| Corrosion | weakens and destroys amalgam |
| cheif difference between plaster and stone | particle sizes |
| the more water you add to a plaster mix | the longer the setting time |
| the most dense gypsum is | die stone |
| how would you use a light body impression material | in a syringe |
| polyether and polyvinylsiloxanes (PVS) | most popular elastomers in the dental office |
| gypsum is at it's hardest after | 24 hours |
| when gypsum goes from a hemihydrate to a dihydrate | water is added |
| etching | prepares the tooth for bonding a dental material |
| resin tags | small finger like projections that appear after ethching the tooth surfaces |
| condensation silicone | gives off a by-product of gas, water, or alcohol |
| when pouring an impression you should | mix for 1 minuter and vibrate for 10 minutes |
| when sealants come off within 6 months this means | cross-contamination happened during the etching process |
| sealants are indicated for | deep pits and fissures |
| Evidence=based dentistry | is today's approach to dental care |
| Fluoride | first used in Colorado Springs |
| ADA Seal is for the | consumers |
| when a dental material dissolves in oral fluid it is called | solubility |
| ability to absorb fluids | sorption |
| adhesion | bonding dissimilar molecules |
| silane coupling agent | binds the filler and matrix |
| composites are placed in increments to | allow light to penetrate, less curing time is needed, darker shades require more curing time |
| fluorosis | has mottled enamel |
| characteristics of chlorhexidine | substantivity, stains, solubility |
| tuberosity | is located on the maxillary arch |
| retromolar pad | is located on the mandibular arch |
| When mixing gypsum cold water | slow or decrease the setting process |
| When mixing gypsum warm or hot water | increase or speed up the setting process |
