Mod 4 Final Flashcards Preview

Dental Assisting > Mod 4 Final > Flashcards

Flashcards in Mod 4 Final Deck (205):
1

With light cured cements, it is not necessary to advise patients to avoid sticky foods, since the cement is set.

False

2

In preparation of cementing with a composite resin, the tooth is prepared by:

Placing acid etchant

3

The most commonly used vasoconstrictor utilized in impregnated retraction cords is:

Epinephrine

4

When there is a possibility of a pulp exposure, or if there is a potential of coming too close to the pulp:

An indirect pulp cap liner is placed

5

Loss of alveolar bone associated with extended periods of wearing a removable prosthetic will occur most often with the ____ arch.

Mandibular

6

When all of the natural teeth are missing, this is called being edentulous.

True

7

When fitting a stock impression tray, the operator must look to determine if mandibular ____ is present on the lingual aspect.

Tori

8

Final impressions are used for the fabrication of crowns, bridges, and bleach trays.

False

9

The material supplied as a cartridge system is:

BIS-GMA composites

10

Materials used to fabricate removable prosthetic devices include:

Synthetic plastic resins and alloy metals

11

A primary advantage of the use of polyether impression materials is that polyether may be repoured several times due to its low tear strength and dimensional stability.

False

12

A polyether ____ to mix as compared with polysulfide impression material

is easier

13

Natural teeth or implants used to support or anchor the fixed prosthesis are:

Abutments

14

What does the etching do in preparing a tooth for a final restoration?

Removes the smear layer

15

The dental professionals who might be involved in the actual fabrication process of a provisional restoration are:

Dentist, dental assistant, and dental lab technician.

16

The three types of bases are

Insulating, sedative, and protective

17

____ materials are used to record and simulate how the patient's areches occlude.

Bite registration

18

Polyether impressions can be adversely affected by immersion in a disinfectant. Which disinfectant can be utilized for immersion?

Chlorine compound

19

The correct mixing procedure for alginate impression material requires the following

All of above

20

The components of the removable partial denture include all of the following except:

Attachment

21

Border molding is:

Part of the final impression, where softened compound or wax is placed along the borders of the denture.

22

A full crown for a single tooth is needed to restore a tooth that has lost approximately ____ percent or more of its natural tooth structure.

50

23

When making a mouth guard on the vacuum former, the plastic sheet is placed and secured onto the:

Metal frame

24

One dentin sealer product that is designed to cut off the flow of the tubule fluids by sealing tubules is:

Gluma

25

The major connector on the mandibular prosthesis is often a ____ design.

Bar or plate

26

A properly fitting provisional restoration prevents saliva from leaking onto the dentinal tubules. This will prevent:

Sensitivity to hot and cold.

27

A vacuum former may be used to fabricate bleach trays, mouth guards, or fluoride trays.

True

28

A preformed polycarbonate crown works well for tooth #14, since it is more aesthetically pleasing and only needs to be relined.

False

29

____ teeth will resist stain, but are brittle and noisy.

Porcelain

30

Intermediate restorations provide extended periods of clinical observation for a tooth with a questionable prognosis. Materials of choice are

Reinforced ZOE cements

31

Alginate impression material will take approximately 2-3 minutes to develop into a ____ state.

Gelation

32

A preformed provisional single unit can be fabricated from:

All of the above

33

____ is released by some varnishes to help with hypersensitivity of the cervical areas.

Fluoride

34

Due to an acidic element of zinc phosphate when it is used, a liner must also be placed.

True

35

A provisional that is improperly fitted might cause some tooth movement, which could require adjustments or even a possible remake of the final restoration.

True

36

The teeth most often used to anchor or hold the overdenture are the first premolars.

False

37

Which base is best used as an insulating base?

Polycarboxylate

38

Advantages of the indirect provisional coverage technique include all of the following except:

Less expensive than the direct method.

39

Which of the following is true of varnishes?

They can be used to seal the dentin tubules.

40

A precise replica of a prepared tooth created from an impression is a/n:

Die

41

Newer technology continues to improve the strength, shade choices, setting characteristics, and ____ for provisional materials.

Clinical techniques

42

Study models, bleaching trays, and mouth guards are all examples of ____ impression.

A preliminary

43

Provisional restorations should accomplish all of the following except:

Discourage healing of soft tissues.

44

____ is used to protect the tooth from damaging effects of moisture.

Varnish

45

The provisional restoration is referred to as a temporary prosthesis or a/n:

Interim restoration

46

After spraying hydrocolloid impressions for disinfection, they should be placed in a plastic bag to prevent evaporation of the disinfectant.

True

47

The cement that is mixed on a glass slab to minimize the temperature rise from the heat given off is:

Zinc phosphate

48

____ seals the dentinal tubules that prevent oral fluids and bacteria from seeping between the tooth and the restorative material.

Desensitizers

49

High strength base glass ionomer cements:

all of the above

50

When sizing the retraction cord, the best judgement for length is the circumferance of the index finger.

False

51

____ material is more brittle are than methacrylates, and is not suitable for provisional bridges.

Bis-acryl composite

52

An opaquer will be utilized to:

Block out the dark color of cast metal restorations prior to stacking the natural tooth-colored preparation

53

The use of ____ through the interproximal areas will help to dislodge any casual-set dental cement.

Dental floss

54

The acrylic base may be impregnated with pigmentation and fibers to

Create a natural appearance

55

Which of the following would not be completed during the first crown procedure appointment?

Removal of the provisional

56

Calcium hydroxide promotes secondary dentin, is insoluble, and bonds to dentin.

False

57

The cast model is a positive representation of someone's dentition

True

58

The dentist will make small preparations on the occlusal, incisal or lingual surfaces of a tooth to accomodate the ____ portion of a removable partial denture.

Rest

59

After acid etching the tooth, if it becomes contaminated with saliva, simply redry the tooth.

False

60

One advantage of a removable prosthetic is that it

Replaces missing teeth and structure for function and aesthetics.

61

____ is the most widely used preliminary impression material in dentistry.

Alginate

62

Material or low viscosity resins that are used to improve retention between two objects, such as enamel and dentin, and the restoration are called

Bonding agents

63

Success will be achieved when taking an elastomeric impression if good retraction techniques are practiced with moisture control and proper ____.

Tissue retraction

64

Calcium hydroxide is a common type of dental liner that is also known by the manufacturer name:

Dycal

65

Bonding agents and restorative materials are considered intermediary materials

False

66

Impregnated retraction cords contain astringent- vasoconstrictor agents to control bleeding and shrink the tissue, sich as epinephrine.

True

67

When calcium sulfate dehydrate is heated, the end product is called

Hemihydrate

68

Preformed polycarbonate provisional crowns are available for both ____

Anterior and bicuspid posterior teeth

69

The separate restoration fabricated to rebuild damaged or fractured tooth structure in preparation for a crown is a

core buildup

70

Glass ionomer material has the following properties, except that it

Comes with a solvent

71

Composite resin cements have thick film, and are easily dissolved by oral fluids in the mouth.

False

72

____ is the best used as a protective base

Zinc phosphate

73

A ____ guard prevents material from spraying the room while using the rag wheel and pumice.

Splatter

74

When using a base, the sequence of placement would be base, liner, restorative.

False

75

For a temporary restoration, a low strength base with sedative qualities would be used, such as

Zinc oxide eugenol

76

What materials are used to provide a buffer between the pulp and the final restoration?

Dental bases

77

To prevent drifting of the dentition, it is important to maintain ____ between the teeth

Proximal contact

78

Glass ionomer cement mechanically and chemically bonds to enamel, dentin, and metallic materials.

True

79

The two parts of a cast model are the ____ which includes the teeth and oral structures.

Anatomic portion

80

Dentures should be cleaned

All of the above

81

Type II glass ionomers are used for restoring areas of erosion near the gingiva

True

82

Partial dentures most often are made of composite resin or porcelain.

False

83

The dental cement used as a temporary restoration, permanent cement for cast restorations, and as a high strength base is called

Polycarboxylate

84

The two basic components of a compete denture are the:

Denture base and teeth

85

The cement that has a sedative effect on the pulp is:

Zinc oxide eugenol (ZOE)

86

____ are a type of provisionall crown that are only utilized on posterior teeth, where aesthetics are not a concern.

Aluminum shell crowns

87

Should the preparation become moderately too deep or close to the pulp, the dentist will place ____ under the final restoration.

Base

88

When the tooth responds to the stimuli of saliva coming in contact with the pulp, this is referred to as

Biological

89

After placing the sealer on the tooth, one should wait ____ before air drying.

30 seconds

90

Zinc phosphate powder is properly prepared by ____ the bottle.

Shaking

91

History has found that teeth in dentures were sometimes made from ivory, bone, or teeth from either dead or living donors.

True

92

The retraction cord is placed within the sulcus with the use of a/n ____ instrument.

Cord packing

93

Which of the following is not a contraindication for a fixed prosthesis?

Good adjacent teeth are available for abutments.

94

Polysiloxane impression materials, commonly known as addition silicone materials, are available in an automatic dispensing unit that includes

An extruder gun and mixing tip

95

Factors that might indicate the need for a patient to have a full complete denture treatment planned include

All of the above

96

The portion of the denture that contacts the abutment teeth and prevents movement of the partial when chewing and swallowing the retainer

Clasp

97

Galvanism is a pulpal stimuli

True

98

Eugenol is an obtudent, meaning it is soothing to the pulp.

True

99

Stone model should be soaked in water for at least ____ minutes before trimming to help with the trimming process.

30

100

Patients who wear a removable partial denture are encouraged to maintain regular dental exam and teeth cleanings to ensure that the

Remaining teeth do not develop dental caries, and the remaining bone remains healthy

101

____ is placed on the floor of the cavity preparation to protect pulp from bacteria and irritants

Liner

102

The most common form if gingival retraction is

Chemical

103

The forms ZOE comes in for restoration application include capsule, syringe, ____ and two paste systems.

Powder/ liquid

104

The process or ability of an impression to shrink over time due to the loss of water is called

Syneresis

105

All dental cements may be used as bases

True

106

Methacrylates contain both a base and a catlayst, and work by self polymerizing.

True

107

A restoration that covers or replaces the major part or the whole part of the clinical crown of a tooth is a:

Crown

108

Veneers may be fabricated to accomplish all of the following except:

Open spaces or diastemas

109

A stent is used most often to fabricate a/n ____ provisional.

Bridge

110

An inlay is an example of a class ____ restoration.

II

111

All impressions should be gently rinsed to remove blood and debris, then soaked or sprayed with:

Hospital grade disinfectant

112

Hydrocolloid materials change from one state to another due to their:

Thermal changes

113

Which materials would currently be utilized to fabricate a removable prosthetic device?

Alloy metals and synthetic plastic resins

114

Imbibition is the process of contracting and shrinking with time because of exuding water

False

115

After disinfecting an impression, the impression should be loosely wrapped in a plastic bag to prevent ____

Evaporation of the disinfectant

116

When finished trimming with a model trimmer, it should immediately be turned off.

false

117

The type of prosthesis that utilizes wings that are bonded to the lingual surfaces of anterior teeth is a/n:

Maryland Bridge

118

Dental cements are more versatile in their properties, ____, and mixing techniques.

Uses

119

A gypsum substance consiting of two parts water and one part calcium sulfate is called

Dehydrate

120

When the alginate impression is removed from the patient's mouth, the operator should ____ and then disinfect.

Rinse the impression under cold water

121

Advantages to using the direct technique for fabricating as provisional restoration include

Time eficiency

122

____ is most commonly used as a sedative base

Eugenol

123

Excess cement can become lodged within the gingival crevice by ____ the gingiva to provide the operator the ability to visually inspect the marginal area.

Retracting

124

Mechanical retraction is accomplished with the use of:

A temporary crown

125

Celluloid crown form provsionals are available only for

Premolars and anterior teeth

126

After cementation of the provisional restoration, patients should eb educated that the cement requires ____ for final set.

45 minutes

127

When taking impressions, the steps after placing the tempered material into a hydrocolloid tray are in the order

123

128

ZOE with eugenol is contraindicates for use with composite

True

129

A partial and a denture are two examples of a prostheses

True

130

A patient might need to wear a provisional restoration for a period of ____ to allow bone and gingival tissues to heal around an implant.

Six months

131

Dental lab mixing bowls are disinfected with

Hospital grade disinfectant

132

There are several methods used for fabricating a tempory; vacuum formed matrix, alginate impresssion, and PVS impressions

True

133

Retraction cords are placed to stop tissue bleeding and to ensure accurate impressions of the margin

True

134

A patient who is ednetulous

is without teeth

135

The disinfecting of reversible hydrocolloid impression includes

Use of an iodophor or glutaraldehyde solution

136

Type I ZOE cement has low strength and great anti microbial properties, adn therefore is ideal as a permanent restoration.

False

137

Which of the following would not be an important consideration to education of patients who are wearing a provisional restoration?

The provisional might break or come off but will not need to be re cemented

138

____ is another product placed between the liner and the permanent restoration to help protect the pulp.

Base

139

Hydrophillic impression materials have an aversion to water and less wetting ability

False

140

An exothermic reaction occurs when you are light-curing cements

False

141

A dental lathe and model trimmer are used in the same way and can produce the same results

False

142

Composite resin cements are utilized for

Bonding orthodontic brackets

143

All materials used in the restoration of a tooth prior to the placement of the final restorative material are known as

Intermediary

144

Surgical retraction performed to remove hypertrophied or excess tissue is accomplished with the utilization of an electrosurge, surgical knife or

Laser

145

The temporary crown should extend beyond the margin, so that the margins are protected from decay

False

146

Many difficulties can occur when manipulating irreversible hydrocolloid material, including:

All of the above

147

The consistency of zinc oxide and eugenol cement when used as a temporary restoration

Putty like

148

When removing dental cement from the interproximal areas, the dental assistant should use a ____

Fulcrum

149

Factors that might result in a patients choosing a removable prosthesis as opposed to a fixed prosthesis include;

adequate bone support

150

A polycarboxylate cement us utilized for

All of the above

151

WHile working with vacuum formers, lathes, or model trimmers, hair should be pulled back into a pony tail and all PPE should be worn

True

152

The patients dental ____ are mounted onto the articulator with lab plaster

Casts

153

The restoration that is fabricated to be placed into a prepared cavity, and that covers the occlusal surface and one more cusp is

onlay

154

Stone models should be soaked in ____

Water

155

A high strength base dental cement needed for restoration

Zinc polycarboxylate

156

The initial setting time for most dental plaster is ____ minutes.

5-15

157

When applying dentin bonding resin material, it is important to air dry the tooth until the tooth is desicated.

False

158

A screw like device specially designed to be placed surgically within the mandibular or maxillary bone is a

Implant

159

A tray made specifically for an individual patient

Custom tray

160

The prepared tooth may also be called the stump

True

161

To add a new layer of hard acrylic to the internal portion of a denture, which serves to restore the overall fit

Reline

162

A denture that does not fit the alveolar ridge properly will

cause degeneration of the ridge more rapidly

163

When mixing zinc phosphate cement, the powder and liquid are mixed over a large area with a ____ motion.

Figure eight rotary

164

If warm water is added when mixing alginate impression material, the material will set:

faster

165

A preformed provisional single unit crown may be fabricated from polymer, polycarbonate, aluminum, copper, and

Celluloid

166

The V Shaped spaces formed by the contour and position fo the adjacent teeth is the

Embrasure

167

Unused hydrocolloid tubes that have already been boiled are ____ for a total of three times for reuse.

Re boiled

168

Which of the following is not an important consideration for a posterior provisional restoration

Provide acceptable aesthetics

169

Provisional restorations must satisfy mechanical, aesthetic, and ____ factors.

Biological

170

Many times the dental assistant will be responsible for obtaining preliminary impressions

True

171

Articulation is the term for the position of the mandible when the teeth are fully biting together

False

172

Indications for a fixed prosthesis include all of the following except

Supportive tissues bone and gingiva are diseased

173

A ____ is utilized to restore the anatomical crown on an endodontically treated tooth during the preparation phase of crown placement.

Cast post

174

To prevent changes in a reversible hydrocolloid impression such as dimensional changes to syneresis or imbibiton the operator should

Immediately pour the impression

175

The major advantage of an all ceramic crown is that it

Is more natural looking

176

In addition to the health history, records that would also be utilized during a prosthetic appointment include study models, radiographs, and

Photographs

177

The purpose of the retainer is to connect the partial to the abutment teeth and to

Prevent movement of the partial

178

Reinforcement of a provisional bridge might be necessary of a patient has oral habits such as

Clenching or grinding

179

The smear layer is created through the use of dental burs

True

180

Agar- hydrocolloid material is heated until it flows and is cooled. It changes from a

Gel to a sol to a gel

181

Most dental cements are also used as a ____ which is applied in a thick layer over a liner

Base

182

Custom trays are utilized for impression to fabricate complete and partial dentures and:

Long bridge spans

183

The provisional crown is fabricated before the crown preparation appointment

False

184

The chemical setting process of resin materials is known as

Polymerization

185

The articulator ____ movement of the mandible and the shape of the patients condyle to duplicate the patients occlusion

Simulates

186

The type of wax commonly used for registering a patients occlusion is known as

Bite reg wax

187

During setting, zinc phosphate cement creates an exothermic reaction and therfore needs to be mixed on glass slab.

True

188

Zinc phosphate cement is known as the gold standard cement because it was the first cement discovered to have the ability to chemically bond to the tooth structurew

False

189

The two paste systems are mixed manually with :

A spatula, an oil- impermeable paper pad, or clean glass slab

190

With the powder/liquid ZOE, the liquid contains the resin and accelerator

False

191

A fixed partial denture is also known as a

Fixed bridge

192

Reline is a process where softened compound or wax is placed along the borders of the denture

False

193

The embrasure is the junction where the temporary provisional meets the tooth structure

False

194

Glass ionomer cements release ____ to help prevent caries

Fluoride

195

Silicone rubber impression material is sensitive to

Moisture

196

If any dental cement is left at the contact area, tooth ____ oculd occur

Sensitivity

197

Polycarboxylate cement shuld be mixed for approximately ____ seconds in order to allow time for the seating of a fized prosthesis

30

198

The pontic portion of a fixed bridge is

the artifical tooth that replaces the missing tooth

199

An abutment tooth with evidence if caries should be ___ before taking the impression for denture

Restored

200

A patient with type II periodontal disease and rampant decay on multiple teeth would be a candidate for crowns and or bridges

False

201

____ types of liner are used in cavity preparations

three

202

Bonding agents bond to all of the following except

Varnish

203

Gingival retraction cords are supplied in untwisted and twisted ___ forms

braided

204

Dentin sealers are commonly known as ____ and are used instead of dental varnishes

Desensitizers

205

A properly contoured provisional should extend to the ___ portion of the preparation but not beyond

margun