MCQs in Chapter 1 of Contemporary Orthodontics

1-Perfect occlusion of the teeth is present NATURALLY in

a. Less than five percent of the population .b. About 25 percent of the population .c. About 50 percent of the population .

d. Nearly 100 percent of the population.2-What is the relation of the lower first

molar to the upper first molar in an Angle Class II malocclusion?

a. Mesialb. Lateral

c. Distal

d Normal 3.Overbite is defined as .. overlap of the

incisors .a. Horizontal

b. Verticalc. Transverse d. Mesiodistal

4.Which malocclusion is LEAST prevalent ?a. Class I

b. Class II c. Class III

d. All5 .At what age should a child be referred for

an orthodontic examination ?

a. Three years b. Six years

c. Seven years d. Fourteen years

6 .Which of the following is generally NOT the responsibility of the primary care

dentist ?a. Early recognition of developing malocclusion

b. Performing comprehensive treatment of complex malocclusion

c. Performing limited objective tooth movement d. Preserving and maintaining space for the

developing permanent dentition 7 .Which term describes the vertical relation

of upper and lower incisors ?a. Crossbite b. Overbite

c. Overjet d. Underbite

8 .Which of the following is NOT a variation of normal occlusion ?

a. Mild crowding b. Open bite

c. Slight midline deviation d. Small diastema

9 .Angle Class II malocclusion is also called a. distoclusion .

b. mesioclusion .

c. neutroclusion .10 .What is the purpose of orthodontic

treatment ?a. To move teeth in order to improve esthetics and

function b. To improve facial proportions

c. To prevent periodontal disease d. To put each tooth into the position it is supposed

to occupy 11 .Which aspect of malocclusion is the most

common ?a. An oversized lower jaw

b. Crowded teeth c. Spaces between teeth

d Single tooth crossbite12 .What is the maximum age for a person to

have orthodontic treatment ?a. 8 years

b. 12 years c. 25 years

d. There is no maximum age 13 .Which tooth is used to identify the type of

occlusion in the Angle classification?a. Upper central incisor

b. Canine c First premolar

.d. First molar

14. Which is NOT a goal of orthodontic treatment ?a. Esthetics b. Function

c. Restoration of the teeth

d. Stability 15 .Why do most patients seek orthodontic

treatment ?a. To have better function

b. To improve the appearance of their smile c. To make the teeth easier to clean

d. To prevent their teeth from being lost to periodontal disease

16 .What term is given to the first permanent molars ?

a. Cornerstone of the arch b. The key to occlusion

c. "Old Glory "d. The genetic determinant

17 .What describes the Class II relationship using the Angle

Classification system?a. The lower arch is distal in its relation to the upper

arch .b. The lower arch is mesial in its relation to the

upper arch .c. The arches have normal mesiodistal relation

d. None of the above .

18 .What is the Angle classification of occlusion based upon?

a. The position of the maxillary incisors relative to the mandibular incisors

b. The position of the maxillary incisors relative to the mandibular incisors

c. The position of the maxillary first permanent molars relative to the mandibular first permanent

molars.d. The position of the upper lip relative to the lower

lip19 .Which of the following is the MOST

common?a. Class III malocclusionb. Class II malocclusionc. Class I malocclusion

d. Normal occlusion20 .What dental relationship is present in an

Angle Class I occlusion?a. The buccal cusp of the maxillary second

premolar aligns with the mesiobuccal groove of the mandibular first molar.

b. The cusp of the maxillary canine aligns with the cusp of the mandibular canine.

c. The mesiobuccal cusp of the maxillary first molar aligns with the mesiobuccal

groove of the mandibular first molar.d. The mesiobuccal cusp of the maxillary

first molar aligns with the embrasure between the mandibular first molar and

second premolar.21 .Which of the following best characterizes

a malocclusion involving a subdivision classification?

a. The buccal segments are of different Angle classifications.

b. The buccal segments are Angle Class I.c. The buccal segments are Angle Class II.d. The buccal segments do not involve an

Angle Class I.22 .A patient with a -5mm overbite can be

classified to have which type of malocclusion?

a. Crossbiteb. Deep bite

c. Class IId. Openbite

23 .What is Orthodontics?a. The branch of dentistry that specializes

in the diagnosis, prevention and treatment of dental and facial irregularities .

b. The branch of dentistry that specializes in the treatment of dental and facial

irregularities.c. The branch of dentistry that specializes

in the diagnosis, prevention and treatment of dental irregularities only.

d. The branch of dentistry that uses orthopedic appliances to correct dental

and facial irregularities.24 .Which one of the following is associated

with edge-to-edge incisors ?a. Class III malocclusion

b. Class II, division 1 malocclusion c. Class II, division 2 malocclusion

d. Class I malocclusion 25 .Which of the following statements is true for

the Angle classification ?a. Describes sagittal relationships b. Describes vertical relationships

c. Identifies transverse discrepancies d. Localizes the skeletal discrepancy

26 .Which malocclusion is described by the following two statements? 1) The disto-buccal

cusp of the upper first permanent molar (bilaterally) is located, when in occlusion, in the

buccal groove of the lower first permanent molar. 2) There is a deep overbite of the incisor

teeth .a. Class I malocclusion .

b. Class II, division 1 malocclusion c. Class II, division 2 malocclusion

d. Class III malocclusion 27 .All of the following are goals of modern

orthodontics EXCEPTa. Creation of the best balance among occlusal

relationships.b. Dental and facial esthetics.

c. Periodontal maintenance .d. Restoration of the dentition.

28 .Orthodontics is defined (by AAO) as the area of dentistry concerned with the:

a.Restoration of the dentition.b.facial esthetics and function.

c.Supervision, guidance and correction of the growing and mature dentofacial

structures.d. Dental occlusion, facial esthetics and function.

29 .In which of the following malocclusions is the line of occlusion not specified?

a. Class Ib. Class IIc. Class III

d. All of the above.30 .The irregularity index is assessed in wich of

the following planes?a. Occlusogingival

b. Mesiodistalc. Transversald. Labiolingual

31 .Major responsibilities of orthodontics include:

a. Diagnosis,prevention, interception and treatment of all forms of malocclusion.b. Design,application and control of appliances.c. Guidance of the dentition and its supporting

structures.d. All of the above.

32 .Extreme irregularity index is seen in which age range and racial/ethnic

groups,respectively?

a. Age 18-50, Hispanic.b. Age 8-11, Black.

c. Age 12-17, white.d. Age 50-75, All racial/ethnic groups.

33 .The line of occlusion is a smooth (catenary) curve passing

1-Through the central fossae of upper molars and across the cingulum of the upper anterior

teeth.2 -through the central fossae of lower molars

and across the cingulum of the lower anterior teeth.

3 -Along the buccal cusps and incisal edges of the upper teeth.

4 -Along the buccal cusps and incisal edges of the lower teeth.

a. 1 and 2 b. 2and 3 c. 1 and 4d. 2 and 4

34 .All of the following are evaluated in NHANES III EXCEPT

a. The irregularity index.b. The prevalence of anterior crossbite.

c. The prevalence of midline diastema > 2mm.d. Overjet and overbite.

35 .A midline diastema is most likely to be seen in

a. Blacks

b. Whitesc. Hispanicsd. Orientals

36.All of the following are true regarding oral function EXCEPT

a. Severe malocclusion in adults causes their difficulty in chewing.

b. Severe malocclusion may make adaptive alterations in swallowing

necessary.c. TMD and ulcerative colitis are correlated in

stressfull conditions.d. Posterior crossbite with a shift on

closure correlate positively with TM joint problems .

37 .Which of the following is defined as IOTN grade 5?

a. Increased overjet greater than 9 mm.b. Increased and complete overbite with gingival or

palatal trauma.c. Anterior crossbite with greater than 2 mm discrepancy between CR and ICP.

d. Presence of supernumerary teeth.38 .TPI grade 4-6 is equal to which of the

following IOTN grades?a. 1b. 2c. 3

d. 4-5

39 .In normal occlusion, where does the mesiobuccal cusp of the maxillary first molar

occlude?a. In the distobuccal groove of the mandibular first

molar b. In the embrasure between the mandibular first

and second molars c. In the embrasure between the mandibular

first molar and second premolar d. In the mesiobuccal groove of the mandibular first

molar 40 .In normal occlusion, which embrasure does

the cusp of the maxillary canine occupy ?a. Between the mandibular canine and first

premolar b. Between the mandibular central and lateral

incisors c. Between the mandibular first and second

premolars d.Between the mandibular lateral incisor and canine

Answers of Chapter 1

1 a 8 b 15 2

2 2

9 3

6

2 c 9 a 16 2

3 3

0 3

7

3 b 10 1

7 2

4 3

1 3

8

4 c 11 1

8 2

5 3

2 3

9

5 c 12 1

9 2

6 3

3 4

0

6 b 13 2

0 2

7 3

4 4

1

7 b 14 2

1 2

8 3

5 4

2