DENTAL MECHANIC – MEDICAL EDUCATION

PROVISIONAL ANSWER KEY
Question Paper Code: 58/2019/OL
Category Code: 015/2019
Exam: Dental Mechanic
Medium of Question: English
Date of Test 03-12-2019
Department Medical education
Alphacode A
Question1:-The primary denture support area for a mandibular complete denture is
A:-The crest of the ridge
B:-Buccal shelf area
C:-Mylohyoid ridge
D:-Retromolar pad
Correct Answer:- Option-B
Question2:-Two or more parallel axial surfaces of abutment teeth shaped to direct the prosthesis during placement and
removal are called
A:-Indirect retainers
B:-Undercuts
C:-Guiding planes
D:-Reciprocation
Correct Answer:- Option-C
Question3:-The advantage of a metal denture base over a resin base is
A:-Low cost
B:-Poor dimensional stability
C:-Greater weight
D:-Thermal conductivity
Correct Answer:- Option-D
Question4:-Face-bow is used for
A:-Recording vertical jaw relation
B:-Recording horizontal jaw relation
C:-Recording orientation jaw relation
D:-Recording centric relation
Correct Answer:- Option-C
Question5:-The cross section of lingual bar is
A:-Pear shaped
B:-Half pear shaped
C:-Round shaped
D:-Triangular shaped
Correct Answer:- Option-B
Question6:-During surveying, the height of contour is delineated by
A:-Analyzing rod
B:-Undercut gauge
C:-Carbon marker
D:-Wax knife
Correct Answer:- Option-A
Question7:-Labial frenum contains
A:-Levator angulioris muscle
B:-Buccinator
C:-Orbicularis muscle
D:-No muscle
Correct Answer:- Option-D
Question8:-The primary purpose of posterior palatal seal is
A:-To provide retention for the maxillary denture
B:-To provide support for the maxillary denture
C:-To reduce food accumulation beneath the denture
D:-To compensate the volumetric shrinkage of polymerisation of acrylic resin
Correct Answer:- Option-A
Question9:-Labial bar is indicated in case of
A:-Incompetent lips
B:-Diastema
C:-Labial inclination of teeth
D:-Lingual inclination of teeth
Correct Answer:- Option-D
Question10:-The part of an RPD frame work that transmits stress to the abutment teeth and also serves as a vertical stop
for the framework is called a
A:-Major connector
B:-Minor connector
C:-Rest
D:-Denture base
Correct Answer:- Option-C
Question11:-A mean value articulator is also known as
A:-Anatomic articulator
B:-Hinge articulator
C:-Three point articulator
D:-Semi adjustable articulator
Correct Answer:- Option-C
Question12:-The posterior occlusal plane in complete denture is made parallel to
A:-Ala tragal line
B:-High lip line
C:-Low lip line
D:-Frankfurt horizontal plane
Correct Answer:- Option-A
Question13:-Which of the following Kennedy’s class cannot have modification spaces?
A:-Class I
B:-Class II
C:-Class III
D:-Class IV
Correct Answer:- Option-D
Question14:-Boiling point of PMMA monomer is
A:-103°C
B:-100.8°C
C:-130°C
D:-113°C
Correct Answer:- Option-B
Question15:-Base metal alloys are most commonly invested using
A:-Gypsum bonded investment
B:-Phosphate bonded investment
C:-Silicate bonded investment
D:-Divestment
Correct Answer:- Option-B
Question16:-Which of the following is not hydrophilic?
A:-Agar
B:-Polysulphide
C:-Alginate
D:-Polyether
Correct Answer:- Option-B
Question17:-Tripoding the cast is done for
A:-Reorientation of the cast to surveyor
B:-Reorientation of the cast to articulator
C:-Recording the undercut area of the cast
D:-Recording the undercut area of the teeth
Correct Answer:- Option-A
Question18:-Zinc oxide-eugenol impression material sets by
A:-Exothermic reaction
B:-Syneresis
C:-Chelation
D:-Imbibition
Correct Answer:- Option-C
Question19:-Which of the following is known as Model cement?
A:-Beading wax
B:-Boxing wax
C:-Sticky wax
D:-Modelling wax
Correct Answer:- Option-C
Question20:-The most dimensionally accurate impression material is
A:-Agar
B:-Polysulfide
C:-Polyether
D:-Addition silicone
Correct Answer:- Option-D
Question21:-The term “Green shrinkage” is related to
A:-Firing of Porcelain
B:-Investments
C:-Shrinkage of acrylicresin
D:-Alginate
Correct Answer:- Option-B
Question22:-Balanced stone refers to
A:-Dental stone
B:-Impression compound
C:-Resin incorporated gypsum product
D:-Product containing equal amount of accelerator and retarder
Correct Answer:- Option-D
Question23:-The distance between maxillary major connector and gingival margin is
A:-6 mm
B:-3 mm
C:-8 mm
D:-4 mm
Correct Answer:- Option-A
Question24:-The minimum thickness of base of the cast at its thinnest portion should be
A:-7 mm
B:-10 mm
C:-14 mm
D:-16 mm
Correct Answer:- Option-B
Question25:-The most important factor in the arrangement of teeth is
A:-Mold
B:-Leverage
C:-Occlusion
D:-Compensating curve
Correct Answer:- Option-C
Question26:-The most difficult tooth to set in a complete denture patient is
A:-Maxillary canine
B:-Maxillary 1st Premolar
C:-Maxillary central incisor
D:-Mandibular canine
Correct Answer:- Option-C
Question27:-The pontic given in esthetic zone is
A:-Ovate
B:-Saddle
C:-Hygienic
D:-Modified ridge lap
Correct Answer:- Option-A
Question28:-A refractory die is made from
A:-Primary impression
B:-Secondary impression
C:-Duplicating the master die
D:-Duplicating the primary die
Correct Answer:- Option-C
Question29:-Porcelain bond to the alloy primarily by
A:-Chemical bond
B:-Mechanical bond
C:-Vander wall bond
D:-Micromechanical bond
Correct Answer:- Option-A
Question30:-Which of the following material is not desirable for making refractory cast from final cast of RPD?
A:-Agar
B:-Alginate
C:-Silicone
D:-Polyether
Correct Answer:- Option-D
Question31:-Permanent tooth with least mesio-distal dimension is
A:-Maxillary central incisor
B:-Maxillary lateral incisor
C:-Mandibular central incisor
D:-Mandibular lateral incisor
Correct Answer:- Option-C
Question32:-Which among these is used for designing cast partial denture?
A:-Bite wax
B:-Base plate wax
C:-Casting wax
D:-Sticky wax
Correct Answer:- Option-B
Question33:-Buffing wheels are used in
A:-Grinding process
B:-Cutting process
C:-Finishing process
D:-Polishing process
Correct Answer:- Option-D
Question34:-The projection of maxillary anterior teeth beyond their antagonists in a horizontal plane is referred to as
A:-Cuspal inclination
B:-Over jet
C:-Over bite
D:-Centric occlusion
Correct Answer:- Option-B
Question35:-Rouge is used in polishing
A:-Titanium
B:-Acrylic
C:-Zirconium
D:-Gold
Correct Answer:- Option-D
Question36:-The use of Chromium in Cobalt – Chromium alloy is
A:-Improving biocompatability
B:-Decrease the hardness
C:-Corrosion resistance
D:-Increase castability
Correct Answer:- Option-C
Question37:-Which of the following fuel gas is better for soldering?
A:-Natural gas
B:-Butane
C:-Propane
D:-Acetylene
Correct Answer:- Option-C
Question38:-The hardest structure in human body is
A:-Enamel
B:-Dentin
C:-Bone
D:-Periodontal ligament
Correct Answer:- Option-A
Question39:-Which among the following is a most commonly used provisional restoration?
A:-Poly carbonate crowns
B:-Acrylic crowns
C:-Cellulose acetate crowns
D:-Preformed stainless steel crowns
Correct Answer:- Option-B
Question40:-The most common tilt employed during surveying is
A:-Anterior tilt
B:-Posterior tilt
C:-Zero tilt
D:-Lateral tilt
Correct Answer:- Option-C
Question41:-Proximal plate employed in RPD is
A:-Direct retainer
B:-Indirect retainer
C:-Minor connector
D:-Major connector
Correct Answer:- Option-C
Question42:- I bar engages
A:-Mesiobuccal undercut
B:-Distobuccal undercut
C:-Mesial undercut
D:-Distal undercut
Correct Answer:- Option-B
Question43:-Swing lock partial denture is a modification of
A:-Labial bar
B:-Lingual bar
C:-Palatal bar
D:-Linguoplate
Correct Answer:- Option-A
Question44:-Christensen’s Phenomenon is associated with
A:-Complete dentures
B:-RPD
C:-FPD
D:-Implant dentures
Correct Answer:- Option-A
Question45:-All of the following are components of pontic except
A:-Facing
B:-Solder joint
C:-Backing
D:-Connector
Correct Answer:- Option-D
Question46:-The ability of the prosthesis to resist displacement in a vertical direction is
A:-Retention
B:-Stability
C:-Support
D:-Resilience
Correct Answer:- Option-A
Question47:-The angle the rest makes with the minor connector should be
A:-90°
B:-Greater than 90°
C:-180°
D:-Less than 90°
Correct Answer:- Option-D
Question48:-The filler incorporated in a impression material imparts
A:-Strength
B:-Plasticity
C:-Flow
D:-Elasticity
Correct Answer:- Option-A
Question49:-The most durable maxillofacial prosthetic material is
A:-Polyurethanes
B:-Epiamines
C:-Silicones
D:-Polyvinyl chloride
Correct Answer:- Option-C
Question50:-The maximum intercuspation of teeth is
A:-Centric relation
B:-Centric occlusion
C:-Occlusion
D:-Vertical dimension
Correct Answer:- Option-B
Question51:-Die spacer should provide space of
A:-0.1 microns
B:-0.25 microns
C:-0.35 microns
D:-0.5 microns
Correct Answer:- Option-B
Question52:-Wires preferred for leveling and alignment
A:-Rectangular
B:-Round
C:-Triangular
D:-Elliptical
Correct Answer:- Option-C
Question53:-In blocking out the master cast during surveying, which one of the following is not a blockout?
A:-Paralleled blockout
B:-Shaped blockout
C:-Arbitrary blockout
D:-Round blockout
Correct Answer:- Option-D
Question54:-The function of minor connector in a clasp assembly is
A:-Retention
B:-Stabilization
C:-Support
D:-All of the above
Correct Answer:- Option-D
Question55:-Which of the following cements possesses anticariogenic property?
A:-Polycarboxylate
B:-Glassionomer
C:-Zinc Phosphate
D:-Zn O Eugenol
Correct Answer:- Option-B
Question56:-What must be added to steel in order to render it stainless?
A:-Chromium oxide 3-20%
B:-Carbon < 1.2% C:-Chromium 12-30% D:-Fluoride 2-3% Correct Answer:- Option-C Question57:-White gold alloys contain A:-Platinum B:-Palladium C:-Ruthenium D:-Beryllium Correct Answer:- Option-B Question58:-The activator used in visible light curing system is A:-Ubiquinone B:-Hydroquinone C:-Benzoyl peroxide D:-Camphoroquinone Correct Answer:- Option-D Question59:-The cement used for attachment of orthodontic brackets to teeth is A:-Zinc Phosphate B:-Glassionomer C:-Resin cement D:-Zn O - Eugenol Correct Answer:- Option-C Question60:-Most common drawback of amalgam restoration is A:-Secondary expansion B:-Porosity C:-Marginal breakdown D:-Contraction on setting Correct Answer:- Option-A Question61:-In complete denture patients, A:-Centric relation coincides with centric occlusion B:-Centric occlusion is anterior to centric relation C:-Centric occlusion is posterior to centric relation D:-Centric relation is independent of centric occlusion Correct Answer:- Option-A Question62:-Black casting results due to A:-Contamination with sulphur B:-Contamination with lead C:-Contamination with Arsenic D:-Contamination with Hydrogen Correct Answer:- Option-A Question63:-Beading provides A:-Impression area of cast B:-Land area of cast C:-Art part of the cast D:-Base of the cast Correct Answer:- Option-B Question64:-The corner stone of maxillary dental arch is A:-Maxillary central incisor B:-Maxillary canine C:-Maxillary first premolar D:-Maxillary lateral incisor Correct Answer:- Option-B Question65:-The mean value articulator is based on which theory of occlusion? A:-Bonwill's theory B:-Spherical theory C:-Conical theory D:-Lingualised occlusion Correct Answer:- Option-A Question66:-The process of applying a thin mix of dental stone which is painted over the wax surface and denture teeth is A:-Stippling B:-Festooning C:-Coring D:-Indexing Correct Answer:- Option-C Question67:-The curve located antero posteriorly in a complete denture is A:-Curve of Spee B:-Pleasure curve C:-Monson curve D:-Curve of Wilson Correct Answer:- Option-A Question68:-Hawley's appliance is used in orthodontics for A:-Relapse B:-Retention C:-Anchorage D:-Reciprocation Correct Answer:- Option-B Question69:-The choice of pontic in mandibular posterior region is A:-Ridge lap B:-Ovate C:-Sanitary D:-Saddle Correct Answer:- Option-C Question70:-Screw gag is indicated for patients having A:-Trismus B:-Fracture of facial skeleton C:-Cleft palate D:-Cheloid Correct Answer:- Option-A Question71:-An obturator is indicated for patients having A:-Irradiation B:-Trauma C:-Cleft palate D:-Deviation of mandible Correct Answer:- Option-C Question72:-A combination clasp consists of A:-Cast retentive arm and wrought reciprocal arm B:-Cast reciprocal arm and wrought retentive arm C:-Basemetal reciprocal arm and gold retentive arm D:-Bar clasp and circumferential clasp Correct Answer:- Option-B Question73:-Reinforcing shellac or acrylic with orthodontic wires increases A:-Ductility B:-Malleability C:-Strength D:-Resiliency Correct Answer:- Option-C Question74:-The simultaneous contact of all teeth both in centric as well as eccentric relation and in right and left and anterior and posterior occlusal areas is referred to as A:-Monoplane occlusion B:-Centric occlusion C:-Stability D:-Balanced occlusion Correct Answer:- Option-D Question75:-The term Pindex is related to A:-Devesting B:-Ceramic system C:-Die system D:-Articulator Correct Answer:- Option-C Question76:-The most commonly used separating media is A:-Sodium alginate B:-Potato starch C:-Slurry water D:-Gum arabic Correct Answer:- Option-A Question77:-Muscles of mastication include all except A:-Massetter B:-Temporalis C:-Lateral Pterygoid D:-Platysma Correct Answer:- Option-D Question78:-Heat cure acrylic is packed in A:-Wet and sandy stage B:-Rubbery stage C:-Dough stage D:-Stiff stage Correct Answer:- Option-C Question79:-The process of resurfacing the tissue surface of the denture base is A:-Tissue conditioning B:-Relining C:-Rebasing D:-Remounting Correct Answer:- Option-B Question80:-The distance between the incisive papilla and the central incisors in teeth arrangement should be A:-16 mm B:-18 mm C:-6-8 mm D:-10-12 mm Correct Answer:- Option-C Question81:-The letters M and S in the teeth set indicate A:-Mold and size B:-Mold and shape C:-Mold and shade D:-Mold and square Correct Answer:- Option-C Question82:-The cusp of Carabelli is found on A:-Maxillary first molar B:-Maxillary 2nd molar C:-Mandibular 1st molar D:-Mandibular 2nd molar Correct Answer:- Option-A Question83:-The mesial developmental groove or mesial developmental depression is found in A:-Maxillary 2nd Premolar B:-Maxillary 1st premolar C:-Maxillary 2nd molar D:-Canine Correct Answer:- Option-B Question84:-The oblique ridge found in maxillary first molar connects A:-Mesiolingual and distobuccal cusps B:-Mesiobuccal and distolingual cusps C:-Mesiolingual and distolingual cusps D:-Mesiobuccal and distobuccal cusps Correct Answer:- Option-A Question85:-Labial bow is used in A:-Retraction B:-Tipping C:-Intrusion D:-Expansion Correct Answer:- Option-A Question86:-The ability of the material to be drawn into thin wires is called A:-Malleability B:-Ductility C:-Toughness D:-Resilience Correct Answer:- Option-B Question87:-Posterior Palatal seal area aids in A:-Retention of denture B:-Stability of denture C:-Support of denture D:-Preservation of alveolar ridge Correct Answer:- Option-A Question88:-The apparent force of attraction existing between two dissimilar bodies in close contact is A:-Adhesion B:-Cohesion C:-Capillarity D:-Viscosity Correct Answer:- Option-A Question89:-The refractory material used in investment is A:-Silica B:-Carbon C:-Boron D:-Gypsum Correct Answer:- Option-A Question90:-Antiflux used during soldering is A:-Borax B:-Fluoride C:-Graphite D:-Silica Correct Answer:- Option-C Question91:-Ditching should be done in dies A:-0.5 mm short of finish line B:-0.5 mm beyond finish line C:-1.3 mm short of finish line D:-1.5 mm beyond finish line Correct Answer:- Option-A Question92:-The technique of acrylisation employed routinely in dental practice is known as A:-Injection molding technique B:-Compression molding technique C:-Fluid resin technique D:-Visible light curing technique Correct Answer:- Option-B Question93:-Coffin spring is employed for A:-Buccal movement of canines B:-Proclination of upper anterior teeth C:-Expansion of maxillary arch D:-Distalisation of canine Correct Answer:- Option-C Question94:-Anterior inclined plane or upper inclined plane is used in correction of A:-Proclination of anterior teeth B:-Retroclination of lower anterior teeth C:-Splinting of upper anterior teeth D:-Tongue thrusting Correct Answer:- Option-B Question95:-The zone of flame that is used in casting process is A:-Dark zone B:-Combustion zone C:-Reducing zone D:-Oxidising zone Correct Answer:- Option-C Question96:-The sprue length and thickness used in casting should be A:-Short and thin B:-Long and thick C:-Long and thin D:-Short and thick Correct Answer:- Option-D Question97:-Chamfer finish line is employed in fixed partial denture for A:-Porcelain crown B:-Metal crown C:-Zirconia crown D:-CAD CAM crown Correct Answer:- Option-B Question98:-The anchorage in which the resistance of one or more dental units is utilized to move one or more opposing dental units A:-Simple anchorage B:-Stationary anchorage C:-Reciprocal anchorage D:-Intra oral anchorage Correct Answer:- Option-C Question99:-Frankel's appliance is a A:-Space maintainer B:-Habit breaking appliance C:-Myofunctional appliance D:-Retainer Correct Answer:- Option-C Question100:-Shape memory is exhibited by A:-Nickel-Titanium alloy B:-Beta Titanium alloy C:-Cobalt-Chromium alloy D:-Nickel-Chromium alloy Correct Answer:- Option-A