Year4DD/Orthodontic I/Prof.Mey Phoung/
Orthodontic Knowledge Quiz
Welcome to the Orthodontic Knowledge Quiz! Test your understanding of orthodontic principles and practices through a series of carefully curated multiple-choice questions.
This quiz is designed for:
- Students pursuing orthodontics
- Professionals looking to refresh their knowledge
- Anyone interested in dental care and orthodontics
251. The function of the upper inclined bite plane is ?
To maintain space
To allow eruption the lower posterior teeth
To expand upper arch transversely
All are related
All unrelated
252. The soft tissue effect in functional appliance used ?
Removal of severe crowding of teeth
Removal of lip competent
Removal of lower lip trap and improve lip competence
All are related
All unrelated
253. The indication for functional appliance , what is ideal patient ?
Growing patient with the angle of FMPA increase
Growing patient with anterior open bite
Growing patient with average or FMPA decrease
All are related
All unrelated
254. The working bite of the bite registration to advance the mandible ?
To move forward
To edge to edge or 4 – 6 mm
To occlude to the cingulum plateau of the upper central incisor
All are related
All unrelated
255. What should to do of the stage treatment when finish stage 1 ( functional appliance ) and start the stage 2 ( fixed appliance ) ?
Wear retainer and wait until the patient stop growing
Bonding the brackets in both arches
Reassess anchorage and extraction requirements to prior to fixed appliance
All are related
All unrelated
256. Which options to reduce relapse of the transition from functional to fixed ?
Night time wear of functional appliance 2 or 3 months
Class II elastic as soon as possible
Removable appliance that clips over fixed appliance.
All are related
All unrelated
257. When the overjet increase more than 9 mm increased risk incisors trauma ?
There is a 20 %
There is a 30 %
There is a 40 %
There is a 50 %
All unrelated
258. The patient compliance when wearing functional appliance, the ideally should be?
Worn 14 hours a day
Worn 24 hours a day
Worn at nighttime only
Worn at daytime only
All unrelated
259. When should the patient take off the functional appliance ?
Tooth brushing
Contact sports
Eating is difficult for the first few weeks
All are related
All unrelated
260. What is the advantage of functional appliance ?
Reduce time of treatment in fixed appliance
Reduce anchorage requirements in fixed appliance
Reduce large overjets and Improving class II buccal segments in growing patients
All are related
All unrelated
261. The change in the proportion of head and face during growth of the maxilla ?
Downward and backward
Downward and forward
Upward and backward
Upward and forward
All unrelated
262. For every 1 mm for posterior arch expansion can get approximately?
1 mm is increased
0,75 mm is increased
0,5 mm is increased
0,25 mm is increased
All unrelated
263. Approximate space requirement to flatten a cure of spee when the curve of spee is 5 mm or more ?
1 mm
1,5 mm
2 mm
2,5 mm
All unrelated
264. What type of x-ray could check for notch in interdental bone between #11 and #21 ?
Maxillary anterior occlusal or Periapical view
Panoramic
Bite wing
All are related
All unrelated
265. Which one is the right answer for the canine classification ?
Canine class I
Canine class II
Canine class III
Canine ½ unit class II
All are related
266. Leeway space is:
More in maxilla than in mandible
More in mandible than in maxilla
Both are equal
Unrelated
267. Supernumerary teeth are give rise to:
Delayed eruption of teeth
Malocclusion
Dentigerous cyst
All are related
268. Orthodontic treatment can improve:
The appearance
Mastication
Speed
All are related
269. How many kind of occlusion:
2
3
4
5
270. The main reasons for doing orthodontic treatment:
3
4
5
6
271. Orthodontic treatment options:
3 options
4 options
5 options
6 options
272. Occlusal development divided into:
3 stages
4 stages
5 stages
6 stages
273. Root formation is normally completed after eruption in year:
2-3 years
2-4 years
2-5 years
2-6 years
274. Classification of malocclusion:
2 classifications
3 classifications
4 classifications
5 classifications
275. Normal overjet is:
2mm
3mm
4mm
5mm
276. Normal overbite is:
2mm
3mm
4mm
5mm
277. Flat occlusal plan:
Curve of spee ≤ 1 mm
Curve of spee ≤ 1.5 mm
Curve of spee ≤ 2 mm
Curve of spee ≤ 2.5 mm
278. Flush terminal plane is at:
Labial of Es
Lingual of Es
Distal of Es
Mesial of Es
279. Appliance for treatment is:
Removable appliance
Functional appliance
Fixed appliance
All are related
280. Anomalies in position of teeth is:
Ectopic
Transposition
Impaction
All are related
281. The permanent incisors develop to the roots of the deciduous incisors of face:
Labial
Distal
Lingual
Mesial
282. Other causes of median diastema could be due to:
Large fibrous
Missing or small lateral incisors
Generalised spacing
All are related
283. Normal occlusion is:
Molars relationship: class I ( Angle classification )
Incisors relationship: class I ( British standards incisor [BSI] classification )
No rotation
All are related
284. Anodontia :
Failure in the development of one tooth
Failure to develop all teeth
Tooth impaction
Tooth rotation
285. Two treatment options in missing #12 :
Extraction #63 then replace missing tooth
Use removable appliance for closing space
Reopen the space then replace missing tooth and close the space
Use fix appliance open space
286. Mesiodens :
Found in canine location
Found in buccal segment
Found next to wisdom tooth
Found in the midline
287. 4. Balancing extraction :
Is the removable of the contralateral tooth
Is the removable of wisdom tooth
Is the removable of the equivalent opposing tooth
Is the removable of periapical infection of upper central incisor
288. The prognosis for successful alignment of a palatally impacted upper canine :
Incisor root should be parallel to lateral root
Long axis of upper canine to mid-sagittal plane should be 90°
Root space of canine should be distal to second premolar
Upper canine should overlap not more than the mesial aspect of lateral root and not higher than apical third of the root of lateral
289. Malocclusion cause by thumb sucking :
Minus overjet
Retroclined upper incisors teeth
Upper arch narrowed, unilateral crossbite in posterior segment
Overbite is deep and complete
290. Effective of tongue thrust :
Both buccal segment crowding
Most of anterior crowding
Reduction of overbite or anterior open bite
Increase overbite and complete
291. Flush terminal plane :
Is the line of the mid of the face
Is the line of occlusal plane
Is the line from Mesio-buccal cusp of first molar to canine tip
Is the distal surface of upper E and lower E usually end in line with each other
292. Ectopic position :
Position of tooth away from normal
Position of tooth supra-occlusal
Position of tooth transposition
Position of tooth impaction close to lingual nerf
293. Treatment of large upper labial fraenum :
Close median diastema and frenectomy
Use removable appliance for bodily movement of upper central incisors
Closing space in ugly ducking stage
Closing space by veneer
294. Lower inclined plane :
Cemented to correct anterior crossbite
Cemented to correct posterior crossbite
Removable appliance for correcting posterior crossbite
Fix appliance for correcting anterior crossbite
295. Neural growth :
Is determined by growth of the brain and calvarium
Is determined by growth rotation of mandible
Is determined by growth downward and forward of maxillary
Is determined by growth of naso-maxillary complex
296. The use of lateral Cephalometric radiograph in diagnosis for focusing on the skeletal pattern in dimension view ?
Transverse
Vertical
In-out
All are related
Unrelated
297. What is the meaning of Cephalometric ?
The Skull plus Science of Measuring
The Skull plus Science of Prediction
The Skull plus Science of Analyzing
Unrelated
All are related
298. Which Cephalometric radiograph is most frequently used in Orthodontic ?
Postero-anterior
Lateral View
Lateral Oblique
All are related
Unrelated
299. The use of Cephalometric radiograph for focusing on the skeletal pattern in dimension view ?
Transverse
Vertical
Antero-posterior
All are related
Unrelated
300. The use of Cephalometric radiograph in Diagnosis of ?
Skeletal pattern
Dental base length
Soft tissue
Dental factors
All are related
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