FIXED ORTHODONTICS

DENTAL MEDICINE SPECIALITIES

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FIXED ORTHODONTICS

orthodontics

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آموزش تخصصی ارتودنسی ثابت و متحرک

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Fixed Orthodontics

In Farsi

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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. Mesial

b. Lateral

c. Distal

d Normal

3.Overbite is defined as .. overlap of the incisors.

a. Horizontal

b. Vertical

c. Transverse

d. Mesiodistal

4.Which malocclusion is LEAST prevalent?

a. Class I

b. Class II

c. Class III
d. All

5. 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 crossbite

12. 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 lip

19. Which of the following is the MOST common?

a. Class III malocclusion
b. Class II malocclusion
c. Class I malocclusion
d. Normal occlusion

20. 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. Crossbite
b. Deep bite
c. Class II
d. 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 EXCEPT

a. 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 I

b. Class II

c. Class III

d. All of the above.

30. The irregularity index is assessed in wich of the following planes?

a. Occlusogingival

b. Mesiodistal

c. Transversal

d. 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 4

d. 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. Whites

c. Hispanics

d. 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. 1

b. 2

c. 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	22	29	36
2	c	9	a	16	23	30	37
3	b	10		17	24	31	38
4	c	11		18	25	32	39
5	c	12		19	26	33	40
6	b	13		20	27	34	41
7	b	14		21	28	35	42

Reference books: contemporary orthodontics(Proffit),essentials of facial growth(Enlow & Hans),Textbook of Orthodontics(Bishara),cephalometry(rakosi)


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