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Materials Chp 35 > Chp 35 > Flashcards

Chp 35 Flashcards

0
Q

The impression makes a

A

Negative reproduction in whitch gypsum material can be poured and therefor creates a complete positive model

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1
Q

The dental assistant must pay close attention when

A

Taking materials from the treatment room to the dental laboratory

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2
Q

Alienate

A

Is used when less accuracy is needed.

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3
Q

One of the most common areas in which alganite is used.

A

Diagnostics cast or study models

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4
Q

Potassium alienate

A

Extracted from sea weed and kelp. A marine groth found primarily off the coastline of Japan .

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5
Q

Sol

A

Liquid

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6
Q

Gel

A

Solid

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7
Q

Calcium sulfate

A

Forms a solid

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8
Q

Advantages and disadvantage of alginate

A

Withdraws over undercuts

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9
Q

Undercuts

A

Recessed areas that are wider on the bottom than o n the top

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10
Q

The suggested temperature of water to be used is

A

Room temperature 70f or 21 c

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11
Q

Normal shelf life for alganite materials is

A

No more than one year

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12
Q

Most commonly used tray for alganate impressions

A

Preferated

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13
Q

Preferated trays

A

Have holes and come in metal and plastic

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14
Q

Rim lock trays

A

Has a border around the top to hold to material in place comes in metal and plastic

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15
Q

Beading

A

The process of placing wax around the border of the tray

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16
Q

Preparing for alganate impressions mandibular

A

Mixture should be homogenous and creamy. Load into mandibular tray from both ligule sides. If ness army can use a gloved moistened finger to smooth tip.

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17
Q

Preparing alganite impression for maxillary

A

Load from posterior , take a small amount out from the palate area to prevent from going down the patients throat place some on the occlusal service of the occlusal service of the maxillary

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18
Q

Des infecting alganate impressions

A

1 rinse under tap water to remove debree
2 spray with approved disinfectant
3 if not pouring immediate place in a covered container
4 label with patients name

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19
Q

Wax bite restoration

A

Taken to establish relationship between the maxillary and mandibular

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20
Q

Reversible hydrocolloid ( agar agar ) lot like alganite in that it’s derived from seaweed and kelp

A

One of the oldest impression material that has good detail

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21
Q

Reversible hydro collide changes from

A

Gel to sol than back again. must be boiled in a hydro collide container for 10 minutes there it turns liquide and stays that way for hours if placed in a storage bath of 150f or 66 c

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22
Q

Distortion

A

A deminsional change in shape.

23
Q

Three groups of materials in elastomeric impressions

A

Poly sulfide , silicone, and polyether

24
Q

Polymerization

A

Process where catalyst and accelerator begins to cure and change from past to elastic

25
Q

Polysulfide

A

Been around for a long time and come in two pastes… A base and catalyst

26
Q

Silicones

A

Have the advantages of polysulfide without the dis advantages but are more expensive. High accuracy no shrinkage no tear, no tast no odor

27
Q

Silicone ( polysiloxane) two step impression

A

After material is mixed pat into patty load into prepared tray with finger make a light invention where teeth are located.

28
Q

Polyether

A

Used for crown and bridges , excellent accuracy and deminsional stability , supplied in tubes and past. The larger tube for the base and smaller for catalyst.

29
Q

Gypsum

A

Ground into fine powder. Then heated in cylindrical kettles with agitators. The heating is controlled until a pasific amount of water is driven out of gypsum. The process is known as CALCINATION

30
Q

Exothermic reaction

A

When plaster or ston transforms back to dihydrate witch gives off heat

31
Q

A plaster model will set in

A

10 to 20 minutes

32
Q

A plaster model reaches it optimum hardness

A

In 24 hours

33
Q

Plaster or plaster of Paris

A

Whit gypsum , one of the first and is the weakest and cheapest

34
Q

Type III : laboratory stone

A

Stronger than plaster and used when more strength is needed. Normally yellow due to manufactures added pigments. 30 ml of water to 100grams of powder.

35
Q

Poring alganate for study model

A

Hold on viberater

36
Q

Art portion of plaster study model using two pour metod

A

Ratio of powder to water can altered to creat thicker mix, of poring bases or art portion of both maxillary and mandibular cast the ratio of 100 grams of powder to 40 ml of water , if pouring only one use half.
Mix plaster as before the this part is not as crucial as anatomical portion because bubbles can be repaired.
Gather the plaster on on the spatula and place it on a glass slab or paper towel it is important to let mixture mas upward and not spread out like a pancake.

37
Q

Trimming and fixing diagnostic cast. ( used to present the case to a patient) it is important that they

A

Have an attractive appearance. They are part of the patients permanent record and reflect the type of work the office does.

38
Q

If the maxillary and mandibular plaster models are dry

A

Soak in plastic bowl for five minutes. The trimming on the wheel is more effective if they are wet Pryor to trimming

39
Q

The anitomocal portion of the diagnostic cast includes

A

The teeth the mucosa and frenum attachment and is about one inch high

40
Q

The remaining part of the cast is the base or art portion. And is about a

A

Half inch high

41
Q

Together the anitomocal and art portion is

A

3 inches

42
Q

Each model exhibits a

A

1/2 inch base and 1 inch anatomical portion

43
Q

An articulator is used to

A

Duplicate the patients occlusion on models

44
Q

An articulator is…

A

A farm that holds models of the patients teeth in order to maintain the patients occlusion and represent his or hers jaws

45
Q

A face bows and articulators are used to

A

Duplicate the function of the tmj

46
Q

Boxing wax

A

Soft pliable wax used to form a wax box around an impression Pryor to pouring it with qypsum

47
Q

Custom trays

A

Can be fabricated to fit the need
Can be constructed from self or light curing acrylic , a vacuum reason or or thermoplastic material
Must be Regid enough to provide subsistence forthe material as it is inserted into and removed from the patients mouth

48
Q

Polymerization occurs when

A

Material changes from plastic playbill state to a Regid state.

49
Q

Constructing a self cured acrylic resin custom tray

A

Out line the area of the cast for a spacer to be placed( 2or 3mm below the margin of the prepared tooth) or (2 to 3mm above the lowest point in the vestibul if the arch is endentulouse)

50
Q

Thermoplastic means

A

Materials become soft and pliable when exposed to heat

51
Q

Temporary restorations,

A

Also known as provisional restorations , can be made of a number of materials both custom and preformed

52
Q

Custom acrylic or composite temporary restorations

A

When making a matrix is used. The matrix can be direct or indirect

53
Q

Matrix

A

A shap formed in the pattern of the tooth Pryor to preparing th etooth

54
Q

Sizing adapting and seating aluminum temporary crown

A

Measure the available space from the messiah to the distal with the millimeter ruler
Using a crown and collar scissor ( curved blades) trim the gingival margin.

55
Q

Crowns are never

A

Straight across the service but are longer on the buccal and lingual margins

56
Q

Acrylic crown

A

Code a crown that has enough with on the contact of the adjacent teeth, long enough to be in proper occlusion , and the correct shade.

Materials Chp 35 (1 decks)

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