Questions bank

Orthodontic's Question Bank

Prepared by: Dania, Bahoz, Rasti, Ari aso, Rauand, Nigar, Marwa, Mastan, Huda, Hiba, Lana, Asma, Niga, Shwan.

FILL IN THE BLANKS

1-When habit cause defect in orofacial structure it is termed as pernicious oral habit.

2-thumb sucking causes Labial flaring of maxillary anterior teeth.

3- thumb sucking causes Lingual collapse of mandibular anterior teeth

4- patients who sucks his thumb the upper lip is hypotonic and the lower lip is hypertonic

5- Bottle feeding is more contributory than breast feeding to tongue thrust development.

6- Goals of Cephalometric is Cranium and cranial base , skeletal maxilla , skeletal mandible .

7- Steiner analysis is divided into skeletal , dental , soft tissue .

8- Gnathion : the most aneriorinferior point on the lateral shadow of the chin.

9- Bilateral landmarks are : orbitale , gonion , condylion .

10-defect infusion between frontonasal and maxilary will lead to clift lip.

11-counductive hearing lose and chronic suppurative otitis media may result ear problems.

12-Each lateral nasal prominences is separated from the maxillary

swelling by Nasolacrimal groove.

13- Pharyngeal arches: A series of five paired swellings that surround the

embryonic foregut from day 25 to day 35 of development.

14- Nasal placodes are primordia of nose and nasal cavities

15-The superior, middle and inferior conchae develop on the lateral wall of each nasal cavity

16. hyperplasia increase in the number of cells.

17. change in ratio is development.

18. by time of birth the trunk and limbs grow faster than head and face.

19.extrusion is a type of tooth movement parallel to the long axis of the tooth in the direction of the occlusal plane

20. 3-D dental models had showed that grate stresses while tooth movement occurs at the alveolar crest and apex

21-the paired mandibular prominences develop from caudal part of first pharyngeal arch

22- by the forth day, when the zygote reaches the uterus, it is many celled mass called morula.

23- pharyngeal pounches the endodermally lined depression between pharyngeal arches

24-with the formation of medial and lateral nasal prominace, the nasal placode lies in the floor od depression called nasal pit

25-the blastocoele separates the call into two parts an outer call layer, the trophoblast and an inner call mass the embryoblast

TRUE & FALSE

1- There is an increased overjet of patients who suck their thumb – true


2- The distance between the front surface of the lower incisors and the front surface of the upper incisors. The front surface of the upper incisors is usually 6-10 mm ahead of the front surface of the lower incisors - fasle

3 – placing the tongue inferiorly causes posterior cross bite – true

4 - Facial appearance of child with mouth breathing habit is termed as Adenoid facies. – TRUE

5- nail biting does not cause rotation and crowding of teeth - fasle

6- Nasion is the most anterior point on maxilla at the level of the plate . (False)

7- Incision superius : the incisal tip of the most anterior maxilla central incisor . ( True )

8- Menton is the highest point on the symphyseal outline of the chin . (False)

9-Bolton point is the most posteriosuperior point on the condyle of the mandible . ( False)

10-Orbitale , gonion , articulare , pterygomaxillary fissure , condylion , porion is Bilateral landmark . ( True )

11- S.N.B Angle shuld be >82* prognathic maxilla( class 3 ) , <82* retrognathic maxilla ( class 2) . (False )

12- S.N.B >80* prognathic mandible , <80* retrusive mandible ( True )

13- tweed , Down’s analysis , steinier’s analysis is mandibular plane ( True )

14- Upper incisor to N-A , the normal value is 4 cm . ( False )

15- Cephalometric imaging system consist of X-ray apparatus only . ( false )

16-cleft lip or palate is gentical normal space or gap in upper lip,alveolus and palate.(false)

17-50% of clefts are uniletral and rest are bilateral.(false)

18-local dental problems are congenital missing tooth,haypodontya,oligodontia.(false)

19-speech problem is hearing lose,humper proper development of spech.(ture)

20-schedule of trestment of cleft lip in 3 mounths is primary lip repaier .(ture)

21. Intramembranous replace cartilage (False).

22. The mesoderm of the five prominences is continuous with each other(True).

23. Pharyngeal grooves: the endodermally lined depressions between the

pharyngeal arches (False).

24.The upper lip is formed by the two medical nasal prominences and the

two maxillary prominences (True).

25. The paired mandibular prom

26.growth is largely an anatomical phenomenon,wherease development is physiologic

and behavior. True

27.growth may or may not bring development. True

28.developmentis not possible without growth. False

29.changes and growth can occur after tooth eruption. False

30.hypertrophy is more important mechanism than hyperplasia. False

31.in bodily movement all points on a tooth move in different direction by the same amount. False


32.overjet is also called horizontal overlap. True

33.prognathism affects the upper part of the face. False

34.orthodontic tooth movements are based on the apposition and resorption of gingiva. False

35.the center of resistance of each tooth is not constant and changes with tooth characteristics. True

MULTIPLE CHOICE

1- Most children stop sucking their tongue at what age?

a) 5-6 years b) 10-12 years c) 1-2 years d) 3-4 years

2- Thumb sucking causes?

A) High palate B) Low palate C) Does not affect palate D) Both A and B

3- Tongue thrusting causes ?

a) Increased overjet b) Generalized spacing between teeth c) Maxillary constriction d) All of above


4- Dry mouth is associated with which of the below conditions?

a) Tongue thrusting b) Thumb sucking c) Mouth breathing d) B and C

5- Night time bruxism is caused due to rhythmic contraction of which muscle?

a) Orbicularis oris b) Tensor palatine c) Temporalis d) Masseter

6- the center of hypophyseal fossa is

a-PNS b-ANS c-Ptm d-SELLA

7- most posterior point on the curve between ANS & SPr is :

A.Subspinale B. supramentale C. Incision inferius D.Incision Superius

8- the frontonasal suture at most superior point on the curve at the bridge of the nose is :

A. pogonion B. Gnathion C. Basion D. Nasion

9- the angle that refer to the proclination of the lower incisor (N-B) angle is


a- <25* b- >25* c- <32* d- >32*

10- Bolton is the highest point in the upward curvature of the

a-retrocondylar fossa b-hypophyseal fossa c-maxillary fossa d-mandibular fossa

11- gnathion may be approximated by the midpoint between

a-pogonion & gonion b-menton & gonion c-pogonion & menton d-none of them

12- THE mean value of occlussal plane angle is :

a- 14 degree b-14.5 degree c-21.9 degree d-32 degree

13- Steinier analysis extend from :

a-Go to Me b-Go to Gn c-Gn to Me d-Go to N

14- All of the following are soft tissue landmark except :

a-Subnasale b-Submentale c-Pronasale d-Subspinale


15- disadvantage of down analysis is/are :

a-many landmarks b-many measurments c-time consume d-all of the above

16-microform cleft may look like

a-Postiror nasal spine is almost always missing b-Midline diffecincy

c-Speech problems d-A scar from the lip up to the nostril

17-which one of the fallowing is incorrect about the advantage of prenatal dignosis

a-Time for prenatal education

b-Time for prenatal pathological preparation

c-Opprtunity to investigate other assosiated abnormalites

d-Give parrent choice of countinuing pregnancy

18-mediacal conditional and abnormalty reffers to dawnward displacement of tounge


a-Glossoptosis b-Pierrer robin sequence c-Nasal defformty d-Cleft lip

19-local dental problems are

a-Class III tendency b-Antiror and postiror crossbite c-Enamel haypoplasia d-Spacing and crowding

20-schedule in teatment of cleft lip and palate in 16 years

a-Lip revision surgery b-Alveolar bone graft c-Nasal revision surgery d-Palate repaier

21. As the cell mass divides, it enlarges and gains fluid filled cavity

termed the

A- Trophoblast B- Endometrium C- Morula D- Blastocele

22. Ectoderm forms the:

A- Liver B- Parathyroid glands C- Cartilage D-Skin

23. Initially the nasal sacs and separated from the oral cavity by:


A-Mesial nasal prominence B- Oronasal membrane C- Lateral nasal prominence D- Nasal septum

24- Which of the following is marked by the first fetal movement perceived by mother ?

A- 5th month B- 4th month C- 6th month D- 7th month

25- Which of the following is an example of Endochondral growth?

A-Cranial vault B- Ethmoid C-Maxilla D-Mandible

26.increase in size and number is:

A) hypertrophy B) growth c) hyperplasia D)development

27.if extracellular matrix Not mineralized interstitial growth continue in ………..

A) hard tissues b) soft tissue and cartilage. c)bonesd) tooth

28.major portion of the skeletal system is originally modeled in

A) blood b) muscle c)cartilage d) joints


29.for any orthodontic tooth movements we need.

a)tooth, bone B) healthy PDL c)applied force D)all of them

30. lack of incisal contact when jaw is closed normally is called:

A)deep bite B) cross bite C)open bite D)overjet

31.a torsion force applied to a tooth to produce or maintain crown or root movement is termed as :

A) uncontrolled movement B) bodily movement c) torque D) center of rotation

32.optimal orthodontic force applied for intrusion is

A)10-20 b) 50-100 c)35-60 d)70-120

33.orthodontic adverse affects can cause damage to

a)pulp b)PDL c)none of them d)both of them

34- mesoderm forms


a-Muscle, bone & cartilage b-Blood & kidney c-Reproductive system organs d-All of the above

35-Each lateral nasal prominece is separated from maxillary swelling by

a-Nasolacrimal groove b-Nasal placode c-Nasal pit d-Non of the above

CLASSIC

1- What are the extraoral and intraoral features of thumb sucking?

Intraoral:

Labial flaring of maxillary anterior teeth.

Lingual collapse of mandibular anterior teeth Increased overjetTongue placed inferiorly leading to posterior cross bite due to maxillary arch contraction.

Extraoral:

Lips Upper lip may be short and hypotonic.

Lower lip is hyperactive .

Facial form analysis:-

Check for mandibular retrusion.

Maxillary protusion.

Fungal infection on thumb

2- Give the definition of Bruxism, its classification and the clinical features

Definition Habitual grinding of the teeth due masseter muscle contraction

Classification Day time bruxism and night time bruxism

Clinical features Trauma to occlusion and periodontium , Tooth mobility , Headache , Pain in TMJ , Masticatory muscle soreness

3-what are problems assosiated with cleft lip and palate ?

-Fedding

-dental problems-

nasal deformity and estathic problems

-ear problems-

-speech deficalty

-assosiated anomalies.

4-what are the nasal deformity and esthitic problems ?

-facial disfigurements

-poor nasal shape

-scar marks of surgeres

-poor lip function during speech

-poor dental alingment and smile

5-Explain appositional growth?


- Growth occur by combination of hyperplasia, hypertrophy and secretion of extracellular matrix

- Occurs only at the surface of bones

- Addition of new bone to the surface of existing bone

- Occur through the activity of cells in the periosteum

EX: bony surfaces of cranial vault and, bony surfaces of maxilla and mandible