CDT COMPREHENSIVE EXAM AND PRACTICE EXAMS, Exams of Nursing

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CDT COMPREHENSIVE EXAM AND PRACTICE

EXAMS WITH ACTUAL CORRECT QUESTIONS

AND VERIFIED DETAILED ANSWERS BY EXPERTS

|FREQUENTLY TESTED QUESTIONS AND

SOLUTIONS |ALREADY GRADED A+ |LATEST 2024 |

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1.- What are wetting agents used on wax patterns for

A- Allow patterns to ease the flow of metal B- clean the wax pattern for easier divesting C- helps surface tension thus decreasing nodules on metal castings D- can help in using less water powder ratio for investments

C

2.- A depression cut into the patient's abutment tooth to prepare it for a partial framework is called

A-groove B- connector C- finish line D- rest prep

D

3.·Cusp to fossa occlusion is advantageous over cusp to embrasure occlusion because

A·it causes a " tight" effect B- provides less balancing interference C- it provides more balanced distribution of force D- is more natural in natural dentition

B

4.- The bilateral curve between buccal and lingual cusps is called

A- curve of Spee B- compensating curve C- curve of Wilson D- Monson curve

C

5.- The chroma of a color refers to

A- intensity B- amount of gray C- amount of orange D- basic color

A

6.- When torch soldering, which part of the flame should be used

A- mixing B- Reducing C- Combustion D- oxidizing

B

7.- The part of the tooth that extends above the gingiva is called

A- cingulum B- cervical C- Crown D- embrasure

C

8.- A disadvantage of agar type impression materials is that they must

A- should be poured immediately B- are not too accurate C- they give off bad odors D·hard materials to manage

A

9.- What is a muscle of facial expression

A- masseter B- orbicularis oris C- temporalis D- mylohoid

B

10.- The most simple articulator,that has no movement other than basic opening and closing is

A-hinge B- fixed guide

C- semi adjustable D- fully adjustable

A

11.- Materials that soften under heat and become solid when cold but do not change chemically are called

A- thermocure B- thermoset C- thennogel D- thermoplastic

12.- What clasp emerges from an occlusal embrasure area and engages the undercut

A- ball clasp B- arrowhead clasp C- Adams clasp D- all of the above

13.- What happens when gypsum investment is allowed to set under water

A- increases its expansion B- decreases its expansion C- uneven expansion D- there is no expansion

14.- An advantage of using custom impression trays is

A- flexibility B- rigidity C- uniform thickness of impression material D- it customizes the impression

15.- A crown sprue and button weighed 7dwt 9gr. After removing crown the remaining button and sprue wheighed 5dwt llgr What does the crown weigh

A- 2 dwt. 22 gr B- 2 dwt. 18gr C- dwt. 22gr D- 1dwt. 18gr

16.- What combination of gases is most desirable for melting ceramic alloys

A- oxygen and air B- natural gas (or propane) and oxygen

C- natural gas (or propane) and air D- acetylene and oxygen

17.- An imaginary line drawn through the abutment teeth,around which a partial would tend to rotate is called

A- survey line B- fulcrum line C- sagittalplane D- transverse line

18.- The basic face forms include ovoid,square,and

A-round B- modified ovoid C- Tapered D- rectangular

19.-Application of an anti-flux prior to soldering will

A- confine solder flow to the desired area B- eliminate oxides within the solder connection C- allow solder to flow easily on the solder joint D- remove the flux from the solder joint

20.- lodophors are used in the dental laboratory for what purpose

A- to replace tin foil substitute B- as a polishing agent C- high shine agents D- surface disinfectants

21.- Another name for a labial bow is a

A- Hawley bow B- wrap-around bow C- invisalign bow D- horizontal bow

22.- A facebow is used to

A- relate the maxillary cast to the mandibular cast B- record centric relation C- relate the maxillary cast to the condyles D- record vertical dimension

23.- To remove small particles of stone in processed dentures what can it be Immersed In

A- Calcium citrate B- borax C- Sodium nitrate D- Sodium citrate

24.- What impression material would not be acceptable for a final impression for a fixed partial denture

A- alginate B- polysulfide C- reversible hydrocolloid D. silicone

25.- Hepatitis A or B virus can survive on a non disinfected stone cast at room temperature for

A- weeks B- days C- hours D- minutes

26.- the shape of the temporal muscle resembles a (n) A- square B- oval C- rhomboid

A- square B- oval C- rhomboid D-fan

27.- What type of container is used to store Hydrofluoric acid

A- loosely sealed glass container B- metal container with ventilation C- tightly sealed metal container D-tightly sealed plastic container

28.- What does the technician need to do to make porcelain restoration appear wider than the space available for the tooth

A- interproximal porcelain of a higher value than the body shade B- interproximal porcelain of a lower value than the body shade C- cervical porcelain of a higher chroma than the body shade D- cervical porcelain of a lower chroma than the body shade

29.- The________is the lateral curve in complete denture set up

A- curve of Pound B- curve of Spee C- compensating curve D- curve of Wilson

30.- What is one health hazard associated with visible light-curing systems

A- skin cancer B·eye strain C- retina damage D- color blindness

31.- The margin on a prepared tooth may be beveled in order to improve

A- margin seal B- margin strength C- subgingival margin strength D- emergence profile

32.- What is the cleanest form of alcohol to use in torches and burners

A- ethanol B- denatured C·isopropyl D- methanol

33.- Orthodontic appliances rely heavily on stainless steel wire which has been alloyed with

A- Beryllium and nickel B- silver and aluminum C- tin and cobalt D- nickel and chrome

34.- Which of the following is an indication for the use of a keyway or interlock

A- a long span B- non parallel abutments C- short abutments D·loose teeth

35.- A custom acrylic tray is used to

A- incorporate an inhibitor into the impression material B- improve patient comfort

C- Provide a more accurate impression D- accommodate the various types of impression materials

36.- On a gold crown wax up the sprue should be attached to the

A-lingual area B- highest cusp C- thinnest area D- bulkiest area

37.- The articulator uses custom ground condyle guides,close simulation of the timing and direction of the Bennett movement,and simulation of the rotating condyle,among other features

A-semi adjustable B- fixed-guide C- hinge D- fully adjustable

38.- Improper surface preparation of a metal substructure may result in porcelain that may be

A- Overglazed B- underglaze C- gorous D- milky

39.- The portion of the wax pattern that should be placed in the thermal zone or heat center of the ring is the

A- Margins B- reservoir C- entire crown D- chill vent

40.- During firing porcelain shrinks towards its

A- least mass B- greatest mass C- center D- edges

41.- One consideration to make when attaching a sprue lead to any framework wax up is that metal remains liquid longer in the __________________parts of the casting

A- edentulous B-lighter C- retention D-heavier

42.- A surveyor is used to

A- apply arbitrary blockout to a cast B- determine the height of teeth C- establish the position of the rests D- Identify undercuts on a cast

43.- What prevents an oxide film from forming on molten gold

A- Flux B- anti-flux c- carbon rod D- quartz rod

44.- When commercial separating products are not available, an effective substitute for stone to stone separation would be

A- talc B- hand cream C- mineral oil D- liquid soap

45.- The primary health hazard posed by investment materials is due to their content of

A- silica B- gypsum C- graphite D- calcium

46.- The part of a fixed bridge that is completely artificial and is suspended from a retainer is

A- an abutment B- a veneer C- a pontic D- an onlay

47.- One result of burning out a partial denture mold is to

A- expand the mold B- contract the mold C- prepare the mold for casting D- eliminate gases

48.- A facebow is used to

A- relate the condyles to the maxillary occlusal surface on an articulator B- arbitrary mount casts on an articulator

C- advance the position of the maxilla D- improved esthetics

49.- A removable partial denture is designed to replace

A- all natural teeth B- all missing natural teeth with exception of the third molars C- all missing natural teeth when one or more natural teeth remain D- all missing anterior teeth

50.- The junction of two lobes of a crown is called the

A- oblique groove B- accessory groove C·marginal ridge D- developmental groove

51.- What activates the curing process in autopolymerizing acrylic

A- pressure pot at 20 psi for 20 minutes B- powder and liquid come in contact with each other C- temperature reaches approximately 165 F D- temperature reaches approximately 165 C

52.- Which light source is best used for the curing process of light cured resins

A-sun B- fluorescent C·infrared D·ultraviolet

53.- Which articulator gives a fair to good simulation of a patient's actual mandibular movements because of its adjustable features

A- semi adjustable B-fully adjustable C- hinge D- fixed guide

54.- According to the universal classification system,the patient's upper right second bicuspid (premolar) is numbered

A- 3 B- C·S D-

55.- When viewed from the occlusal what is the crown contour of a mandibular premolar

A- rhomboidal B- rectangular C- trapezoidal D- circular

56.- When was the Certified Dental Technician program instituted

A- B- 1959 C- D-

57.- The surface (area) where two adjoining teeth touch is called

A- proximal surface B- embrasure C- interproximal embrasure D- proximal contact area

58.- In order for a high noble alloy to be considered "high noble" by the ADA council on dental materials what must it contain at least 40%.

A-Au B-Ag C-Si D-Pd

59.- What is the purpose of pickling a casting

A- to create oxides on metal for ceramic alloy B- remove minor scratches C- sterilize the casting D- reduce oxides on the metal

60.- Which statement accurately applies to dental waxes

A- waxes are inorganic materials that soften at room temperature B- waxes have a specific melting point C- waxes are composed of a blend of naturaland synthetic materials D- Waxes maintain their dimensionalstability after forming

61.- The muscle of mastication that originates on the lower border of the zygomatic arch and inserts at the angle of the mandible is the

A- the masseter

B- the temporal C- the buccinator D- the internal pterygoid

62.- While performing maintenance on a porcelain oven,( calibration of the muffle ) what metal is typically used

A- palladium B- platinum C- silver D- zinc

63.- Tacky liquid contains a substance that can dissolve wax or plastic patterns used in partial dentures what is it

A- acetone B- calcium sulfate C-potassium alginate D- citric acid

64.- The most peripheral extent of a preparation is known as the

A- gingival B-margin C-interproximal space D- distal

65.- The fold of mucous membrane extending from the mucosa of the lip to the gingival tissue at the midline is the maxillary labial

A-flange B- frenum C- notch D- vestibule

66.- The smallest of the three cusps of a mandibular second premolar is located on which surface of the tooth

A- mesiolingual B- distolingual C- distobuccal D-lingual

67.- When a dental impression is received in the laboratory it should be handled first with

A- hygienic paper towels B- appliance hemostats

C- latex gloves D- sterile sponges

68.- What kind of gas would be most likely used in a Bunsen burner

A- natural gas B-oxygen C- acetylene D- argon

69.- A dental restoration that fits into a prepared cavity of a tooth structure is called a (n)

A- inlay B- onlay C-crown D-veneer

70.- While mixing plaster,which of the following will lengthen the setting time

A- using a commercial accelerator B- decreasing the water temperature C- increasing the water/powder ratio D- increasing the spatulation time

71.- Another name for the primary dentition is

A- permanent dentition B- deciduous dentition C- adult dentition D- mixed dentition

72.- On which surface of a premolar would a Class 1inlay be found

A- proximal only B- occlusal and proximal C- occlusal only D- proximal and lingual

73.- Why Is it a good idea to cast with a covered casting well

A- reduces the possibility of injuries B·it keeps the torch flame contained C- to keep heat in the crucible D- to keep the crucible hot longer when casting

74.·Materials that contain ammonia or alcohol will produce harmful gas when mixed with

A- iodophors B- bleach C- green soap D- glutaraldehydes

75.- Which preparation creates the effect of lengthening the margin on a restoration

A- knife edge 8-chamfer C·bevel D- shoulder

76.- The greatest convexity on the buccal surface of a lower first molar is located at the

A- junction of the middle and gingival third B- junction of the occlusal and middle third C- middle third of the crown D- occlusal third of the crown

77.- The cross section of a gold casting which has been overheated during casting would be

A- extremely dense B- porous C- shiny bright D- fine grained

78.- As the temperature of inlay wax increases,its_________also increases

A- Thermal expansion B- memory C- Vicker's hardness D- cohesiveness

79.- The largest interproximal embrasure is the

A- incisal B- buccal c- occlusal D- gingival

80.- The use of flux in an area being soldered will prevent formation of

A- Oxides B- carbon C- fluorides D- build up of silica

81.- Which muscle could dislodge a complete mandibular denture

A- Mylohyoid B- temporalis C- mentalis D- triangularis

82.- When trimming orthodontic study models,the back posterior surface of the models are trimmed

------to the midline

A- 62 degrees B- 54 degrees C- 75 degrees D- 90 degrees

83.- Gingival embrasures allow for

A- better occlusion B- better dentalhygene C- narrower mesial and distal contours D- improved esthetics

84.- Vickers and Brinell are associated with what? measurement of dental alloy metals

A- tensile strength B- hardness C- specific gravity of metals D- gold content

85.- Of the following clasp types,which approaches the undercut area from above the survey line

A-Akers B- Roach C- T bar D- RPI

86.- The preliminary impressions are necessary for a partial denture patient because they help

A- diagnose cast for evaluation and planning the design B- prepare master cast on which undercuts are blocked out prior to duplication C- fabricate a stock tray for the final impression D- the manufacture of a refractory modelfor metal framework

87.- a butt joint margin is best achieved on which type of preparation

A- Chamfered

B-feather C- shoulder D- beveled

88.- Gypsum particles can be effectively removed from a denture with a solution of sodium

A- silicate B-chloride C- Citrate D- sulfate

89.- To insure that a maxillary cast is mounted in the articulator in the same way that the maxillae relates to the temporomandibular joints which of the following should be used

A- occlusal rims B- facebow transfer C- blue moose or wax bite D- night guard

90.- Considered very versatile because of its usefulness in fabricating all types of removable prostheses and moderately complicated fixed bridges,which of the following describes this tool

A- disposable B- fully adjustable C- fixed guide D- semiadjustable

91.- Stone casts should be indexed for what purpose

A- to insure good adaptation of the denture B- to allow the casts to be returned to the articulator accurately C-to aid in tooth placement by following indexes D- to aid in the removal of master casts

92.- An antidote for an acid bum is to apply a chemical neutralizer such as

A- water B- baking powder C- king soda D- vinegar

93.-'' To establish cooperation,to raise standards and advance the dignity,honor and efficiency of those engaged as operators of dental laboratories to raise standards of care and service in the dental profession" is the

A- stated purpose from the ADA for dentallaboratory organizations B- stated purpose of our national organization

C- stated mission of local board of dental examiners D- guarantee of all laboratories

94.-What will impart a high luster to gold

A- calcium carbonate B- Tripoli C- zinc oxide D-rouge

95.- When setting 30 degree posterior teeth on a semi adjustable articulator, the incisal guidance should be set at

A- 30 degrees B- 20 degrees C- 15 degrees D- 10 degrees

96.- Fins on castings may be caused by

A- not filling the ring with investment B- heating ring too rapidly C- using incorrect sprue size D- using very hard wax

97.- The purpose of a face- bow is to orient the cast as it relates to the

A- curve of spee B- compensating curve C- condyles D- centric relation

98.- The form of the mesial or distal surface of the tooth is called the

A- height of contour B- buccal convexity C- proximal contour D- embrasure

99.- How would you be able to reduce the setting time of the alginate impression material while duplicating a cast.

A- using cold water in the mix B- using warm water in the mix C- reducing the amount of water used D- increasing the amount of water used

100.- a quick chuck on a lathe allows the technician to

A- change instruments without the lathe B- operate the machine at a higher rate of speed C- rapidly reduce the thickness of a material D- transfer the motor rotation to the cutting instrument

101.- A restoration that would cover at least one or more cusp tips would be

A- a three quarter crown B-an inlay C- a complete crown D- an onlay

102.- On cases where precise duplication of lateral movements are not critical,a technician can use a

A- hinge articulator B- semiadjustable articulator C- fixed guide articulator D- fully-adjustable articulator

103.- When should final impressions first be disinfected

A- disinfecting is not needed because it was done in dental office B- before the cast is poured C- when received in the dental laboratory D- they should not be disinfected due to possible distortion

104.- When mounting complete denture casts on an articulator using a facebow transfer method, the facebow fork is attached to the

A- the maxillary cast B- mandibular occlusal rim C-maxillary teeth D- maxillary occlusalrim

105.- A line drawn at the junction of the hard palate and the soft palate is the

A- ala-tragus line B- palatal line C- vibrating line D- median suture

106.- the process of resurfacing the tissue side of a denture with new base material to make the denture fit more accurately is called

A- duplicating

B- rebasing C- relining D- repairing

107.- To support porcelain, a metal substructure must be

A- rigid B-tempered C- resilient D-annealed

108.- In class 1 occlusion, the maxillary first molar occludes with the mandibular

A- first and second premolars B- first and second molars C- second and third molars D- second premolar and first molar

109.- Which impression material is used to make a fixed restoration

A- alginate B- compound C- polyvinyl siloxane D- irreversible hydrocolloid

110.- The purpose of a shell blaster is to

A- remove gypsum products from acrylic resin B- clean restorations and instruments C- remove investment and oxide residue from castings D- clean the insides of crowns

111.- The primary purpose of an occlusal rim is to determine the

A- incisal edge B- incisal midline location C- labialarch form D- vertical dimension

112.- When you use this impression material you have to design a perforated tray

A- alginate B- rubber base C- agar hydrocolloid D- zinc oxide and eugenol

113.- What type of occlusion is evident when the mesiolingual cusp of the maxillary first molar fits into the central fossa of the mandibular first molar

A-working B- protrusive C- balancing D- centric

114.- Who is responsible for the surveying of the diagnostic cast? ( legally )

A- the dental assistant B- the prescribing dentist c- the dental technician D- the laboratory owner

115.- The effecting mechanism of a hawley retainer is the

A- labial bow B- acrylic palate C- cantilever loop D- reciprocating clasp arms

116.- The expansion of investment materials provides

A- expansion in the size of the mold to match the expansion of the molten metal B- reduction in the size of the mold to match the shrinkage of the molten metal C- expansion in the size of the mold to offset the shrinkage of the molten meatl D- reduction in the size of the mold to offset the expansion of the molten metal

117.-lf relief wax remains in the hydrocolloid mold prior to pouring the refractory cast,what is the likely result

A- no space for acrylic under mesh B- weak framework in the denture base area C- no tissue stop for packing acrylic D-less room for porcelain teeth

118.- The advantage of final impressions is that they are generally considered to be_________than the preliminary impressions

A-less costly B- more versatile C- more flexible D- more accurate

119.- By rotating, grinding, and spacing artificial teeth,the technician can improve

A- facial contours B- phonetics C- the occlusion D- esthetics and function

120.- A complete denture is designed to replace

A- all of the naturalteeth B- all of the naturalteeth except second and third molars C-all of the natural teeth that are missing D- all naturalteeth necessary for eating

121.- With all the types of articulators available, the primary diference among them is the number of________they possess

A- adjustments B- attachments C- millimeters D- fixed pieces

122.- One of the methods for occlusal registration often used is

A- form the dentist's prescription B- plaster impression bite C- patient's occlusal regristration D- bite wax registration

123.- Where is the internal pterygoid muscle located

A- surrounding the lips B-on the medialsurface of the mandible C- above the canine fossa D- near the maxillary sinus

124.- The flow of solder may be confined by using

A- duplicating B- rebasing C- relining D- repairing

125.-What is used as a base polish for acrylic and metal

A- rouge B-Tripoli C- pumice D- zinc oxide

126.- The area of an edentulous mandible which remains relatively constant regardless of the amount of bone loss is the

A- retromolar pad B- buccalshelf C- retromylohyoid fossa D- alveolar ridge

127.- The landmarks for creating a posterior palatal seal are the

A- tuberosities and foveae palatinae B- median suture and hamular notches C- retromolar areas D- foveae palatinae and hamular notches

128.- What type of margin preparation is generally preferred for the fabrication of a porcelain butt margin

A- knife edge B- shoulder C- beveled shoulder D- beveled chamfer

129.- Methylmethacrylate denture base resins may be repaired easily using which acrylic resin

A- heat-cured B- cyanoacrylate C- copolymerizing D·autopolymerizing

130.- Which articulator does not effectively reproduce mandibular pathways of teeth as they move into lateral excursion,particularly with occlusal interference on the balancing side

A- disposable B- semiadjustable C- nonadjustable D- fully adjustable

131.- A vibrator is used to

A- incorporate air into the mix of gypsum material B-produce vibrations to clean residue debris in the impressions C- increase the flow of gypsum products D- reduce the water needed when mixing gypsum products

132.- The tissue stop of a custom tray should

A- position the tray over the crest of the ridge B- support the tray but not displace the tissue C- reposition the tray and prevent it from seating D- displace the tissue to allow for border molding

133.- Final luster when polishing acrylics is best achieved by using

A- flour pumice B- tin oxide C-tripoli D- rouge

134.- Muscle tissue accomplishes action through

A- contraction B- retraction C- antagonism D- stimulation

135.- Resurfacing the tissue side of a denture with new base material,improving its adaptation to the denture foundation area,is called

A- duplicating B- rebasing C- relining D- refinishing

136.- Which pure metal is used to calibrate a porcelain furnace

A- Si B- Pd C-Ni D-Ag

137.- When finishing complete dentures, pumice is applied to the

A- polishing wheel B- bristle brush C- object being polished D- chamois

138.- Excessive use of "tacky liquid'' when applying it to the plastic patterns unto the refractory cast can produce ____________in the final metal casting

A- fins B- nodules

C- pits D- rough edges

139.- The practice of the dentist writing a prescription or work order containing specific information is based on

A- the professional relationship between the dentist and laboratory technician B- law that governs the practice of dentistry C- convenience to convey information D- law written and enforced by OSHA

140.- Casts poured into addition reaction silicone impressions may exhibit multiple surface voids as a result of the impression exuding

A- hydrogen bubbles B- water C- eugenol D-alcohol

141.- An articulator with the condyle on the lower element and the fossa on the upper element is described as

A- anatomical B- nonarcon C- straight line D- Arcon

142.- What material provides the heat resistance and thermal expansion of a high heat metal casting investment

A- potassium sulfate B- borax C- silica D- potassium citrate

143.- Which combination of gases is the best choice for melting metals for ceramic crowns

A- acetylene/oxygen B-hydrogen/oxygen C- nitrogen/oxygen D-propane/oxygen

144.- Broken-arm casting machines use what type of force to push the metalinto the casting mold

A- centrifugal B- gravity

C- air pressure D-vacuum

145.- Calipers designed to measure metal or wax thickness, measure in units of A- tenths of an inch B- hundredths of an inch C- tenths of a millimeter D- hundredths of a millimeter

146.- What can be used to accurately re-establish the original position of the casts on the articulator mountings after processing the resin

A- facebow tool B- bite registrations C- keys to index the base of the cast D- articulator ringsl

147.- The oxidizing zone of a flame is the

A- center B- outer portion C- soldering portion D- melting zone

148.- An advantage of plasterless articulation is that

A- lateral excursive movements are more accurate B- protrusive movements are more accurate C- occlusaldiscrepancies need not be removed D-there is no waiting for stone to set

149.- The purpose of a spacer when fabricating a custom tray is to

A- provide an even thickness of impression material B- allow good flow of the impression material C- reduce the cost of taking an impression D- make the Impression taking precess easier

150.- The centric holding cusps for a mandibular first molar are the

A- mesial cusps B- lingualcusps C- buccalcusps D- distalcusps

151.- Alcoholis used in the dental laboratory for which of the following functions

A- Fuel

B- separating medium C-degreasing agent D- bonding agent

152.- The most important function of correct gingival embrasures is to provide for good

A- spillways B- dentalhygene C- contours D- esthetics

153.- The purpose of an occlusal registration is to

A-relate the casts to the articulator B- establish verticaldimension and centric occlusion C- develop horizontalcondylar guidance D- maintain lateralcondylar guidance

154.- The maxillary cast can be positioned in the articulator In the approximate position that the patient's upper jaw relates to the TMJ by using

A- split cast technique B- panographic transfer C- gothic arch tracing D- face bow transfer

155.- An articulator that would be considered a "holding" instrument because of its limited function of maintaining verticaland horizontal relations between models is the

A- hinge B- fixed guide C- fully adjustable D- semi adjustable

156.- which impression material must be poured immediately

A- Polysiloxane B- rubber base C- hydrocolloid D- polyether

157.- A requirement of casts being hand articulated is that they

A- are poured in either labstone or diestone B- have a base that is 1/2" in thickness C- have the contact points clearly marked by the dentist D- contain enough teeth to establish centric occlusion