MCQs in Orthodontics - Removable and Fixed appliances

# Adams cribs can fracture in use if the:
A. Wire is too soft
B. Tags are high on the bite
C. Base plate is too thick
D. Arrowheads are too small

# How/where should wire be bent to activate a correctly made palatal canine retractor?
A. Between the coil and tooth, but close to the coil
B. Between the coil and tooth, but close to the tooth
C. Between the coil and its insertion into the base of the palate
D. By opening out the coil

# Anterior bite plane is used in correction of:
A. Anterior cross bite
B. Deep bite
C. Open bite
D. All of the above

# Posterior bite plane is used in correcting:
A. Deep bite
B. Anterior open bite
C. Anterior cross bite
D. Posterior cross bite

# Example of semifixed orthodontic appliance is:
A. Kesslings wrap around retainer
B. Hawley's retainer
C. Lip bumper
D. Pin and tube appliance

# The diameter of labial bow of the maxillary plate:
A. 0.5 - 0.6 mm
B. 0.6 - 0.8 mm
C. 0.7 - 0.8 mm
D. 0.8 - 1.0 mm

# A buccal canine retractor is better than a palatial canine retractor when:
A. The maxillary canine is distally placed
B. The maxillary canine is partially impacted
C. The maxillary canine distally placed and rotated
D. The maxillary canine is buccally placed

# An anterior bite plate should be trimmed so that:
A. It is included at 10° to occlusal plane
B. It is inclined at 30° to occlusal plane
C. Posterior teeth are 5 mm apart
D. Posterior teeth are 2 mm apart

# Which of the following is true about Catlan's appliance?
A. It is used to treat cross-bite of maxillary posterior teeth
B. It is constructed on the Lower anterior teeth with an inclined plane
C. If used for a long period it results in anterior deep bite
D. Of constructed on the upper anterior teeth it has a 45 degree angulation

# Anchorage in removable appliances is provided by:
A. Acrylic base only
B. Teeth
C. Acrylic base and teeth
D. Retentive clasps

# Force maintained at some appreciable fraction of the original from one patient visit to the next is:
A. Continuous force
B. Intermittent force
C. Interrupted force
D. None of the above

# The adams clasp is made of:
A. 24 mil wire
B. 28 mil wire
C. 23 mil wire
D. 22 mil wire

# Catlan's appliance is used for the correction of:
A. Deep bite
B. Anterior cross bite
C. Thumb sucking habit
D. Lip biting habit

# Removable appliances bring about:
A. Bodily movements
B. Translation
C. Tipping
D. Derotation

# A helix is placed for:
A. Activation
B. Increasing the flexibility and range
C. Esthetics
D. Retention

# Inclined plane is constructed:
A. 90° to occlusal plane
B. 45° to occlusal plane
C. 30° to occlusal plane
D. 70° to occlusal plane

# Helix in a finger spring for mesial movement lies:
A. Mesial to the Long axis of the tooth
B. Distal to the long axis of the tooth
C. In line to the long axis of the tooth
D. Perpendicular to the long axis of the tooth

# Which of the following clasp is preferable on a partially erupted tooth for adequate retention of removable orthodontic appliance?
A. Circumferential clasp
B. Adams clasp
C. Jacksons clasp
D. South end clasp

# Speech problems associated with removable orthodontic appliances:
A. Difficulty with linguo alveolar consonants for a few days
B. Difficulty with lingual vowel for few days
C. Difficulty with both linguoalveolar consonants and lingual vowel for several weeks
D. No difficulty is found at all

# In Adams clasp, the angulation of retentive points at the bridge portion of clasp should be:
A. 45°
B. 55°
C. 75°
D. 85°

# Which of the following clasp is indicated when retention is required for anterior region?
A. South end clasp
B. Triangular clasp
C. Ball end clasp
D. Adams clasp
 E. A & D

# Which of the following is said to be predecessor of the adams clasp?
A. South end clasp
B. Jacksons clasp or full clasp or u clasp
C. Circumferential or three quarter or 'C' clasp
D. Schwarz clasp

# Which of the following is correct:
A. Z spring or double cantilever spring is used for labial movement of incisors and minor rotation of incisors
B. T spring is used for buccal movement of premolars and sometimes canines
C. Coffin spring is a removable type of expansion spring
D. Canine retractors are springs that are used to move canines in a distal direction.
 E. All of the above

# Which of the following is not correct:
A. U - loop canine retractor is least effective and is used when a minimal retraction of 1-2 mm is required
B. Helical canine retractor or reverse loop canine retractor is indicated in patients with shallow sulcus and specially in mandibular arch
C. Palatal canine retractor is indicated for retraction of palatally placed canines
D. Buccal canine retractor is indicated for retraction of buccally placed canines
E. All of the above

# Which of the following is correct:
A. High labial bow is used mainly to carry auxillary apron springs and is indicated for retraction of anteriors with large over jet
B. Roberts retractor is indicated in patients with having severe anterior proclination (mainly canines) with a overjet of 4 mm
C. Mills retractor or extended labial bow is indicated in patients with large overjet
D. Fitted labial bow is used as retainer at the completion of fixed orthodontic therapy
E. All of the above

# Disadvantages of removable orthodontic appliance:
A. May not be worn by the patient
B. Inability to control root position
C. Has a fail safe effect
D. A & B

# Edge wise bonded brackets are used:
A. On incisal edges of anterior teeth
B. To obtain edge to edge occlusion
C. With rectangular arch wire
D. With labial arch wires at incisal and gingival edges of each bracket

# Which of the following are examples of fixed active appliances?
A. Begg and straight wire
B. Begg and herbst
C. Activator and herbst
D. Activator and frankel

# The main disadvantage of uprighting first molar with a loop Lingual arch is:
A. Extrusion of molars
B. Over correction of molars
C. Flaring of mandibular incisors
D. All of the above

# The first orthodontic appliance devised by Angle was:
A. Edgewise
B. Pin and tube appliance
C. E - arch
D. Ribbon arch

# Differential force concept is mainly used in:
A. Straight wire appliance
B. Lingual appliance
C. Begg's light wire appliance
D. Frankel appliance

# In the III stage of Begg's treatment:
A. Crowding of teeth is corrected
B. Overbite is corrected
C. Extraction spaces are closed
D. Root paralleling is done

# Beta titanium, an excellent choice for auxillary springs is nothing but:
A. Nitinol
B. TMA
C. Stainless steel
D. Sentinol

# Which of the following is not true of a fixed appliance?
A. Economical
B. Rotation and extrusion movements are possible
C. Patient co-operation is not required
D. Tipping and bodily movement are possible

# Coils are incorporated in orthodontic appliances to:
A. Decrease the amount of force
B. Increase the range of movement
C. Increase flexibility
D. Increase the amount of force

# Rotation of teeth is best corrected by:
A. Hawley' appliance
B. Buccal retractor
C. Fixed appliance
D. All of the above

# Lingual fixed appliance is used in:
A. Bilateral loss of 1^st molars
B. Bilateral loss of canines
C. Bilateral loss of laterals
D. Unilateral loss of premolars

# Interrupted forces are applied with the help of:
A. Elastics
B. Screws
C. Springs
D. None of the above

# In fixed orthodontic treatment, how much force is needed for intrusion of four mandibular anterior teeth:
A. 50 gm
B. 100 gm
C. 150 gm
D. 200 gm

# The direct bonded orthodontic stainless steel brackets derive retention with composite because of:
A. The mechanical interlock with mesh at the bracket base
B. The chemical interlock of composite with bracket base
C. Both mechanical and chemical interlock of composite with the bracket base
D. Biological interlock between the tooth surface and bracket

# Which of the following wires are also called shape memory wires:
A. Stainless steel round wire
B. Multiflex round wire
C. Nickel titanium wires
D. Stainless steel edgewise wire

# Disadvantage of the use of laminated arch wire is:
A. Lack of stability
B. Fracture
C. Abruptness in response to adjustment
D. Difficult to handle clinically

# Which of the following are typical and acceptable preventive and therapeutic measures for dealing with the periodontal problems during fixed appliance therapy?
A. Elimination of gingivitis prior to placing orthodontic appliances
B. Home care instruction regarding the use of the toothbrush and water pik during orthodontic treatment
C. Megavitamin therapy
D. Scaling and curettage immediately after appliance removal

# 18/8 stainless steel:
A. 18% Nickel 8% Chromium
B. 18% Chromium 8% Copper
C. 18% Chromium 8% Nickel
D. None of the above

# When length of a spring is doubled, the effect is:
A. Doubled
B. Four times
C. Six times
D. Eight times

# In edgewise appliance:
A. First order bends are given in horizontal direction
B. Second order bends are given in vertical direction
C. Third order bends are placed by twisting the arch wire
D. All of the above are correct

# The iron carbide in orthodontic wire is in the form of:
A. Martensite
B. Ferrite
C. Carbide
D. Austenite

# Decalcification and discoloration of teeth occurs during orthodontic treatment due to:
A. Acid etching
B. Poor oral hygiene
C. Leakage of cement around bands
D. All of the above

# Use of light cure in orthodontics is done in case of:
A. Bonded retainer
B. Fixing the brackets
C. Correction of 1 mm midline diastema
D. All of these

# Straight wire appliance is developed by:
A. Angle
B. Andrew
C. Begg
D. Pancherz

# An example for tooth-colored bracket is:
A. Ceramic bracket
B. Ceram flex bracket
C. Polyacrylic bracket
D. All of these

# A 11-year-old patient wearing full-banded orthodontic appliance has inflamed gingiva. The family dentist should:
A. Encourage better oral hygiene
B. Perform deep scaling and curettage
C. Perform gingivoplasty after debanding
D. Ask orthodontist to remove the bands so that healing can occur

# The copper NiTi wires are not available in the temperature range of:
A. 15°
B. 29°
C. 35°
D. 40°

# Which of the following wires is a better choice if alignment is needed:
A. Nitinol wire
B. TMA wire
C. Elgiloy wire
D. Stainless steel wire

# Which of the following is not correct:
A. In straight wire or pre-adjusted edgewise technique there is inbuilt provision for first order, second order, and third order bends so that the wire may not have any complex bending
B. Tipping movements are permitted in Begg's technique whereas bodily movements are permitted in straight wire technique
C. In Begg's technique, the normal strategy for anchorage control is tipping/uprighting
D. Only Begg's principle is applied in lingual orthodontic technique

# The resiliency of an orthodontic wire as regards to its cross-section will:
A. Increase with an increase in the cross-sectional area
B. Decrease with an increase in the cross-sectional area
C. Remain the same
D. Independent of the cross-sectional area

# In Begg's technique, the width and thickness of molar band is:
A. 0.18 x 0.005 inch
B. 0.125 x 0.003 inch
C. 0.15 x 0.004 inch
D. 0.18 x 0.003 inch

# Intermaxillary elastics are used for correction of:
A. Class I malocclusion
B. Class II malocclusion
C. Class III malocclusion
D. B and C

# The force exerted by wire is:
A. Directly proportional to the cube of the length of the wire
B. Inversely proportional to the cube of the length of the wire
C. Directly proportional to the fourth power of the length of the wire
D. Inversely proportional to the fourth power of the length of the wire

# Slot size commonly used in orthodontics is:
A. 0.017 x 0.021
B. 0.014 x 0.024
C. 0.018 x 0.028
D. 0.010 x 0.020

# Orthodontic brackets attached directly to the tooth are retained by a:
A. Compressive force
B. Mechanical bond
C. Hydrostatic force
D. Chemical bond

# Maximum amount of incisor retraction achieved is:
A. 7mm
B. 16mm
C. 9mm
D. 26mm

# In classical Begg Mechanotherapy, bite opening is primarily effected in:
A. Stage I
B. Stage II
C. Stage III
D. Stage IV

# An upper anterior inclined plane provides:
A. Intra maxillary anchorage
B. Reinforced anchorage
C. Absolute anchorage
D. Reciprocal anchorage

# The rectangular wire used in edgewise appliance is primarily meant for:
A. Correction of crown-root position
B. Increasing the strength of wire
C. Correction of Arch-length deficiency
D. Used for correction of anterior crowning

# Force generated by 90° rotation of finger spring in pendulum appliance with distalisation:
A. 75 gms
B. 125 gms
C. 150 gms
D. 200 gms

# The anchorage utilized by quad helix is:
A. Simple
B. Reinforce
C. Extraoral
D. Reciprocal

# The width of bracket most commonly used are:
A. 0.017 and 0.021
B. 0.014 and 0.024
C. 0.018 and 0.028
D. 0.010 and 0.020

# Adams clasp for premolar is made using the following diameter wire:
A. 0.8mm
B. 0.7mm
C. 0.6mm
D. 0.5mm

# The major force-producing part of the fixed appliance is:
A. Bracket
B. Arch wire
C. Lock pin
D. Band

# Twin wire appliance is a:
A. Fixed appliance
B. Removable appliance
C. Functional appliance
D. Sectional fixed appliance

# Which of the following is not the contribution of E.H. Angle?
A. Pin & Tube Appliance
C. Edgewise Appliance
B. E-Arch Appliance
D. Straight Wire Appliance

# Nickel titanium alloy was first introduced as an orthodontic wire by:
A. Anderson
B. Buchler
C. Burstone
D. Bishara

# Camouflage treatment is best avoided in:
A. Mild to moderate skeletal Class II malocclusions
B. Severe skeletal class III malocclusions
C. Good vertical proportions of the face
D. Patients in the age of growth modulation

# Which of the following is an anterior deprogramming device:
A. Herbst appliance
B. Hawley's appliance
C. Lucus jig
D. Lucia jig

# Surface of NiTi wire is:
A. Rougher than beta titanium wire
B. Rougher than stainless steel wire
C. Both of the above
D. None of the above

# Rotation correction of tooth can be a hazardous process if correction is required over:
A. 20
B. 45
C. 60
D. 90

# Quad helix is used to correct:
A. Posterior cross bite
B. Anterior cross bite
C. Lateral open bite
D. Deep bite

# Catlan's appliance is given for a period NOT more than 6 weeks because it:
A. Causes attrition of upper anteriors
B. Causes periodontitis of anteriors
C. Causes gingival recession in lower anteriors
D. Causes over eruption of posterior teeth

# Concept of lingual orthodontic appliance was introduced by:
A. Atkinson
B. Mershon
C. Johnson
D. Kurz

# Second molars that get locked under the distal cusps of first molars during eruption are best:
A. Extracted and third molars allowed to erupt
B. Autogenously transplanted
C. Disimpacted with "disimpaction springs"
D. Guided with distal shoe space maintainer

# Rate of activation with slow expansion is:
A. 1 mm per day
B. 1 mm for 3 days
C. 1 mm for a month
D. 1 mm per week

# The undesirable side effect most commonly associated with the use of finger spring to tip the crown of a tooth is:
A. Pain
B. Gingival irritation
C. Tendency for the root apex to move in the direction opposite from the crown
D. Tendency for the tooth to intrude

# The highest critical surface tension is for which of the orthodontic brackets:
A. Stainless steel
B. Polycarbonate
C. Ceramic alumina
D. Titanium

# Cold bend test is used to measure:
A. Compressive strength
B. Tensile strength
C. Ductility
D. Malleability

# Which of the following orthodontic wires has maximum surface friction with orthodontic brackets?
A. Australian wire
B. TMA wire
C. NiTi wire
D. Stainless steel wire

# Which of the following wires can be bent for maximum number of times before it gets fractured?
A. Stainless steel
B. Cr-Co -Ni
C. Ni-Ti
D. Beta-titanium

# Which of the following wires cannot be soldered and welded?
A. Beta-Titanium
B. Optiflex wire
C. Gold wire
D. Stainless steel

# Which of the following orthodontic wires cannot be soldered and welded?
A. NiTi
B. Stainless steel
C. Cobalt-chromium
D. Beta-titanium

# Which of the following cements provide maximum resistance to enamel calcification, when used with molar bands?
A. GIC
B. Zinc phosphate
C. Zinc polycarboxylate
D. Silicate

# Gjessing canine retraction spring is made up of:
A. 0.18 x 0.25 stainless steel rectangular wire
B. 0.16 x 0.22 stainless steel rectangular wire
C. 0.17 x 0.25 TMA wire
D. 0.15 x 0.22 TMA wire

# Orthodontically treated midline diastema is best retained by:
A. Hawley's appliance for 6 months
B. Hawley's appliance for 12 months
C. Bonded lingual retainer
D. No need for retainer as it is self-retained

# Dimensions of inner bow of facebow are:
A. 0.045" and 1.125 mm
B. 0.06" and 0.09"
C. 0.045" and 1.25%
D. 0.45 and 0.71"

# The appliance used for uprighting of molar is:
A. Inclined plane
B. Removable appliance with long labial bow
C. Fixed appliance with auxillary spring
D. Separating spring

# Which of the following appliances can be used for correction of single tooth crossbite?
A. Tongue blade therapy
B. Removable appliance with Z spring
C. Fixed appliance
D. Any of the above

# The length of tongue spike in tongue thrusting habit breaking appliance should be upto the:
A. Incisal edges of maxillary incisors
B. Incisal edges of mandibular incisors
C. Cingulum of mandibular incisors
D. Cervical margin of mandibular incisors

# Mushroom arch wire is used in:
A. Beggs appliance
B. Lingual appliance
C. Straight wire appliance
D. Edgewise appliance

# What is the type of wire formed by twisting five tempered wire over a common wire?
A. Twisted wire
B. Braided wire
C. Axial wire
D. Co-axial wire

# Pendulum appliance is used for?
A. Distalisation of molars
B. Derotation
C. Uprighting
D. Correcting open bite

# In Pendulum appliance which wire is used?
A. 0.036" TMA
B. 0.036" SS
C. 0.032" TMA
D. 0.032" SS

# The 'Begg appliance' is a modification of:
A. Ribbon arch appliance
B. E-arch appliance
C. Edgewise appliance
D. Pin and tube appliance