Year4DD/Orthodontic I/Prof.Mey Phoung/
Orthodontic Knowledge Quiz
Test your understanding of orthodontics with this comprehensive quiz designed for Year 4 Dental Students. Featuring questions on cephalometric analysis, skeletal discrepancies, and normative values, this quiz will challenge your knowledge and enhance your learning.
Key features:
- Multiple choice questions
- Covers essential topics in orthodontics
- Ideal for students preparing for exams
201. What’s function of labial bow ( Active ) when apply the force to anterior teeth ?
To procline anterior teeth
To retract anterior teeth
To intrude the anterior teeth
To keep in position of anterior teeth
Unrelated
202. The location of the Basion ( Ba Point ) was known as ?
The most inferior point of the Porion
In the middle point of the sella turcica
Nearest the zygomatic bone
The most superior of the condylar head
All unrelated
203. The maxillary landmark were known as:?
Anterior nasal spine
Posterior nasal spine
Point A
Incisor superius
All are related
204. What cephalometric planes tracing were found ?
Frankfort plane
Maxillary plane
Functional occlusal plane
Mandibular plane
All are related
205. The normative values of SNA angle for the A-P Jaw relationship of the Chinese Norm: ?
SNA: 83±1
SNA: 83±2
SNA: 83±3
SNA: 83±4
All unrelated
206. The normative values of SNB angle for the A-P Jaw relationship of the Chinese Norm: ?
SNB: 80±3
SNB: 82±3
SNB: 83±3
SNB: 84±3
All unrelated
207. The normative values of ANB angle for the A-P Jaw relationship of the Chinese Norm: ?
ANB: 3±1
ANB: 3±2
ANB: 3±3
ANB: 3±4
All unrelated
208. The normative values of SNA angle for the A-P Jaw relationship of the Caucasian Norm: ?
SNA: 81±1
SNA: 81±2
SNA: 81±3
SNA: 81±4
All unrelated
209. The normative values of SNB angle for the A-P Jaw relationship of the Caucasian Norm: ?
SNB: 78±1
SNB: 78±2
SNB: 78±3
SNB: 78±4
All unrelated
210. The normative values of ANB angle for the A-P Jaw relationship of the Caucasion Norm: ?
ANB: 3±1
ANB: 3±2
ANB: 3±3
All unrelated
ANB: 3±4
211. The most frequently used of cephalometric in orthodontic ?
Postero-Anterior view
Lateral view
Lateral oblique
All are related
Unrelated
212. The skeletal discrepancy of Class II malocclusion when ?
The maxilla normal and mandibular retrusive
The maxilla protrusive and mandibar retrusive
The maxilla protrusive and mandible normal
All are related
All unrelated
213. The skeletal discrepancy of Class III malocclusion when ?
The maxilla retrosive and mandibular protrusive
The maxilla normal and mandibular protrusive
The maxilla retrosive and mandibular normal
All are related
Unrelated
214. The skeletal Class I was described when ?
ANB : 2-3 degrees
ANB: 2-4 degrees
ANB: 2-5 degrees
ANB: 2-6 degrees
Unrelated
215. The skeletal Class II was described when ?
ANB : ˃ 1 degrees
ANB : ˃ 2 degrees
ANB : ˃ 3 degrees
ANB : ˃ 4 degrees
All unrelated
216. The skeletal Class III was described when ?
ANB : ˂ 1 degrees
ANB : ˂ 2 degrees
ANB : ˂ 3 degrees
ANB : ˂ 4 degrees
All unrelated
217. Dental analysis, how can upper central incisor compares to ?
SN Line
Maxillary plane
Lower central incisor
All are related
All unrelated
218. Dental analysis, how can lower central incisor compares to ?
Facial plane
Occlusal plane
Mandibular plane
Franfort plane
All unrelated
219. In cephalometric analysis of children with malocclusion, the angle ANB is frequently used. In patients with severe Class II malocclusion, this angle is ?
Greater than the Norm
Less than the Norm
Normal
Unrelated
Sometimes greater, sometimes less
220. Which of the following conditions is usually present in a Class II, Division 2 malocclusion?
Open bite
Steep mandibular plane
Mesiocclusion of permanent first molarsO
Retroclination of maxillary central incisors
Unrelated
221. Anterior teeth are most likely to be fractured in children with which of the following mixed dentition malocclusions?
Class I
Class II div 1
Class II div 2
Class III
There is no relation
222. The best time to correct a upper central incisor crossbite is ?
After permanent canines erupt
After permanent central incisors erupt
After permanent lateral incisors erupt
During erupting stage of central incisors erupt
Un related
223. The inter-incisal angle was constructed by axis of ?
Upper incisor to maxillary plane
Upper incisor to mandibular plane
Lower incisor to maxillary plane
Lower incisor to mandibular plane
Upper incisor to Lower incisor
224. Lower anterior facial height ratio ( % ) was calculated by ?
LAFH + TAFH x 100%
LAFH/TAFH x100%
UAFH + TAFH x 100%
UAFH/TAFH x 100%
All unrelated
225. The line joining the tip of the nose to the chin was called a Ricketts E- Line or Aesthetic Line in Normative value for the Caucasion Norm is ?
Value = 2 ± 2 mm
Value = 2 ± 1 mm
Value = 2 ± 0 mm
Value = 0 ± 1 mm
Value = 1 ± 1 mm
226. The Functional was defined as Removable or fixed appliance that ?
Stretching the muscles
Posture the mandible move forward
Force was transmitted to the dentition
Force was transmitted to the skeletal structure
All are related
227. The most important action of a functional appliance was ?
The condyles in the glenoid fossa
Holding the mandible forwards
Holding the mandible backwards
Holding the mandible upwards
All are related
228. The patient in deep bite case who wear functional appliance the bite plane was used as ?
Posterior bite plane
Posterior capping
Anterior bite plane
Lower incisor capping
Lower incisor inclined bite plane
229. What’s happened when the functional appliance was finished ?
Discrepancy of the skeletal structure
Facial convexity
Condylar heads were ankylosis
Gap in the buccal segments
Lower incisor are retroclined
230. The component that can be used to help upper arch expansion during functional appliance related to the soft tissue change ?
Labial bow
Frankels
Shields
Springs
Wax bite
231. Space analysis requires a comparison between the amount of space available for the alignment of teeth and the amount of space required to align them properly, the method of space analysis when ?
Permanent first premolars have erupted
Permanent second premolars have erupted
Permanent first molars have erupted
Permanent second molars have erupted
Permanent third molars have erupted
232. The space analysis of Tanaka and Johnston prediction value based on in mixed dentition when ?
Lateral incisors have erupted
Central incisors have erupted
Permanent first molars have erupted
All are related
Unrelated
233. The factor that effect to the choice for teeth extraction when the space is required as follows ?
Teeth are poor prognosis
Teeth are well alignment with spacing
Anchorage requirements is enough
Teeth are well alignment without spacing
All are related
234. The soft tissue effect when functional appliance was finished ?
Lower lip incompetence
Lower lip competence
Lower lip seal when swallowing
Lower lip cover full crown of the upper incisors
All are related
235. what’s ideal patient was Indicated for functional appliance ?
Average FMPA
Low FMPA
FMPA : 20-30 deg
All are related
Unrelated
236. What method that can effect for the overbite reduction when patient wear removable appliance?
Molar capping
Posterior bite plane
Anterior bite plane
Head gear
All are related
237. For patient compliance, patient should wear functional appliance regularly at least ?
10 hours/day
12 hours/day
14 hours/day
24 hours/day
All are correct
238. A 12 years old boy with upper and lower teeth alignment in both arches who has class II incisor relationship associated with skeletal II base, what’s appliance should be indicated for this patient ?
Removable appliance
Functional appliance
Fixed appliance
Head gear
All are related
239. Which option can be related to the Andrew six keys ?
Molar relationship class II
Spacing
Rotation
Inclination abnormal
All unrelated
240. The most important of incline bite plane when the functional appliance was finished ?
Keep for aesthetic
Keep mandible in position
Keep mandible move forward
Keep mandible move backward
Keep the gap at the buccal segment
241. The most common cause of median diastema in the ugly duckling stage with patient who has ?
4 to 5 year of age
5 to 6 year of age
6 to 7 year of age
8 to 9 year of age
All are related
242. The patient who has to need for fixed retainers after post- treatment of orthodontic when?
Teeth are spacing
Teeth are Periodontology
Teeth are rotation
All are related
Unrelated
243. What is the right answer for teeth movement in fixed appliance ?
Rotation
Tipping movement
Bodily movement
Extrusion
All unrelated
244. What is the optimum force ( g ) for root uprighting ?
50g – 100g
50g – 120g
50g – 130g
50g – 140g
All unrelated
245. ( overjet= 11 mm ) and the teeth in both arches are well aligned combined with skeletal II base by the normal maxilla when the mandible in retrusive, how can manage this patient ?
Fixed appliance
Removable appliance
Functional appliance
Facemask
All are related
246. Treatment of early loss of deciduous teeth, space maintainer can be used if ?
The E is present
The E has large restoration
The E is lost prematurely
The E has just roots
All unrelated
247. Upper and lower arches were checked in intra-oral examination ?
Inclination of incisors
Crowding teeth
Gingival recession
Cross bite, rotation, missing, impacted….
All are related
248. The angulation of upper and lower permanent canines means that when the canines ?
Mesially inclined
Distally inclined
Upright
All are related
Unrelated
249. What are the components for functional appliance ?
Working bite
Bite-planes
Shields
Extra-components
All are related
250. The component to change the soft tissue balance in functional appliance is ?
Bite-planes
Working bite
Spring
Shield
Screw
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