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Materials Chp 35 > Chp 35 > Flashcards

Chp 35 Flashcards

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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

Study These Flashcards
A

A deminsional change in shape.

23
Q

Three groups of materials in elastomeric impressions

Study These Flashcards
A

Poly sulfide , silicone, and polyether

24
Polymerization
Process where catalyst and accelerator begins to cure and change from past to elastic
25
Polysulfide
Been around for a long time and come in two pastes... A base and catalyst
26
Silicones
Have the advantages of polysulfide without the dis advantages but are more expensive. High accuracy no shrinkage no tear, no tast no odor
27
Silicone ( polysiloxane) two step impression
After material is mixed pat into patty load into prepared tray with finger make a light invention where teeth are located.
28
Polyether
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
Gypsum
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
Exothermic reaction
When plaster or ston transforms back to dihydrate witch gives off heat
31
A plaster model will set in
10 to 20 minutes
32
A plaster model reaches it optimum hardness
In 24 hours
33
Plaster or plaster of Paris
Whit gypsum , one of the first and is the weakest and cheapest
34
Type III : laboratory stone
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
Poring alganate for study model
Hold on viberater
36
Art portion of plaster study model using two pour metod
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
Trimming and fixing diagnostic cast. ( used to present the case to a patient) it is important that they
Have an attractive appearance. They are part of the patients permanent record and reflect the type of work the office does.
38
If the maxillary and mandibular plaster models are dry
Soak in plastic bowl for five minutes. The trimming on the wheel is more effective if they are wet Pryor to trimming
39
The anitomocal portion of the diagnostic cast includes
The teeth the mucosa and frenum attachment and is about one inch high
40
The remaining part of the cast is the base or art portion. And is about a
Half inch high
41
Together the anitomocal and art portion is
3 inches
42
Each model exhibits a
1/2 inch base and 1 inch anatomical portion
43
An articulator is used to
Duplicate the patients occlusion on models
44
An articulator is...
A farm that holds models of the patients teeth in order to maintain the patients occlusion and represent his or hers jaws
45
A face bows and articulators are used to
Duplicate the function of the tmj
46
Boxing wax
Soft pliable wax used to form a wax box around an impression Pryor to pouring it with qypsum
47
Custom trays
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
Polymerization occurs when
Material changes from plastic playbill state to a Regid state.
49
Constructing a self cured acrylic resin custom tray
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
Thermoplastic means
Materials become soft and pliable when exposed to heat
51
Temporary restorations,
Also known as provisional restorations , can be made of a number of materials both custom and preformed
52
Custom acrylic or composite temporary restorations
When making a matrix is used. The matrix can be direct or indirect
53
Matrix
A shap formed in the pattern of the tooth Pryor to preparing th etooth
54
Sizing adapting and seating aluminum temporary crown
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
Crowns are never
Straight across the service but are longer on the buccal and lingual margins
56
Acrylic crown
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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