Year4DD/Orthodontic I/Prof.Mey Phoung/
Orthodontic Knowledge Quiz
Test your understanding of orthodontic principles and practices with this engaging quiz designed for dental students and professionals alike. Whether you're preparing for exams or refreshing your knowledge, this quiz covers essential topics.
- Midline coincidence
- Overbite reduction
- Impression techniques
- Crossbite treatment
- Tooth eruption timings
101. Midline coincidence mean ?
Upper midline shift
Lower midline shift
Upper and Lower midline shift
Upper and Lower midline in the middle
Unrelated
102. What causes of the easy to relapse of overbite reduction when orthodontic treatment was finished ?
Use hawley retainer regime
No occlusal stop
No anterior bite plane
No posterior bite plane
Unrelated
103. Why the model base were kept as a records for the patient in orthodontic treatment ?
Do it as an aesthetic
Keep the position
Easy to know the relationship of occlusion
Easy to count teeth
All are related
104. Why need the precise way to take impression for orthodontic treatment patient ?
Need to check the sulcus
Need to check the fraenum
Need to check unerupted teeth
All are related
All unrelated
105. A 11 years old girl who has class I malocclusion and skeletal I base , the upper and lower teeth alignment associated with unilateral posterior crossbite and mandibular displacement. How can treat this patient ?
Arch expansion screw
Functional appliance
Orthognatic surgery
All are related
All unrelated
106. A 12 years old boy who has class III incisor relationship with the bite edge to edge associated skeletal III base by ANB= 0,5 degree. How could manage this patient ?
Removable appliance with cantilever spring
Removable appliance with screw expansion
Removable appliance with facemask
Removable appliance with high pull headgear
Unrelated
107. Why need to wear removable appliance combined with fixed appliance in orthodontic treatment ?
Easy to clean teeth
Reduce harmful
Need reinforce anchorage
The price is cheaper
Unrelated
108. Hawley retainer regime was placed after orthodontic treatment ?
Wait for bone reorganize
Keep for stability
To prevent the relapse
All are related
All unrelated
109. Adams claps on the first molar for retention were used the wire in diameter ?
0.4 mm
0.5 mm
0.6 mm
0.7 mm
All unrelated
110. Buccal canine retractor can be used in wire size ?
0.4 mm or 0.6 mm
0.5 mm or 0.7 mm
0.6 mm or 0.7 mm
0.7 mm or 0.8 mm
All unrelated
111. How can treat the incisors crossbite when patient is growing ?
Z- Spring
T- Spring
Screw
Lower inclined bite plane
All are related
112. What active component that can move molar distally ?
Coil spring
Claps spring
Headgear
Screw
All are related
113. Why need posterior bite plane in removable appliance ?
To obstruct the buccal segment teeth to erupt
To release the occlusal interference
To control the anchorage
To reduce the overbite
All unrelated
114. How can measure the overjet when intra-oral examination check ?
Use dividor
Use metal ruler
Use meter string
All are related
All urelated
115. Which one is the correct answer of the permanent canine crown width ?
6 mm
7 mm
8 mm
9 mm
All unrelated
116. Which one is the correct answer of the permanent first premolar crown width ?
6 mm
7 mm
8 mm
9 mm
All unrelated
117. How can reduce the overjet when use the removable appliance ?
Screw expansion
Headgear
Class II traction
Labial bow
All unrelated
118. Robert retractor was used in removable appliance to ?
Protract the labial segment teeth
Retract the labial segment teeth
Reduce the overbite
Intrude the incisors
All unrelated
119. Robert retractor was indicated with size of wire ?
0.7 mm
0.6 mm
0.5 mm
0.4 mm
All unrelated
120. Buccal canine retractor was indicated when it’s position ?
Mesially inclined
Distal inclined
Palatally position
Canine upright
All unrelated
121. A 12 years old boy with class II incisors relationship when upper incisor are procline (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
122. Why the lower inclined bite plane was indicated ?
Cheap
Easy to produce
Poor prognosis of all the teeth in buccal segment both side
No areas for retention at the buccal teeth
All are related
123. Overbite normal when measure is ?
2 mm
3 mm
4 mm
5 mm
All are related
124. Overjet normal when measure is ?
2 mm
3 mm
4 mm
5 mm
All unrelated
125. Class II Skeletal base mean ?
When the maxilla protrusive and mandible normal
When the maxilla protrusive and the mandible retrusive
When the mandible retrusive and the maxilla normal
All are related
All unrelated
126. Class III Skeletal base mean ?
When the maxilla retrusive and mandible normal
When the maxilla retrusive and mandible protrusive
When the maxilla normal and mandible protrusive
All are related
All unrelared
127. Lower permanent central incisor erupt ?
9 years
8 years
7 years
6 years
All unrelated
128. Lower permanent lateral incisor erupt ?
9 years
8 years
7 years
6 years
All unrelated
129. Upper permanent central incisor erupt ?
9 years
8 years
7 years
6 years
All unrelated
130. Upper permanent lateral incisor erupt ?
9 years
8 years
7 years
6 years
All unrelated
131. A line that drop perpendicular at the distal surface of Upper and lower E’s was known ?
A facial plane
A flus terminal plane
A lee way space
A occlusal plane
All unrelated
132. The Lee way space of the upper arch is ?
Greater than the Lower arch
Smaller than the Lower arch
Lee way space are the same
Lee way space upper arch is narrow
All unrelated
133. When the child was 6 to 8 years old what can you see the permanent teeth had erupted ?
Upper incisors
Lower incisors
Upper first molars
Lower first miolars
All are related
134. When the first permanent molar was extracted, what’s happened in this area ?
The second permanent molar tilt mesially
The second permanent molar tilt distally
The second permanent molar extruded
The second permanent molar intruded
All are related
135. What’s happened when loss of the lower first permanent molar ?
The lower second premolar tilt distally
The lower second permanent molar tilt mesially
The upper first permanent molar extruded
The contact points in this area are displaced
All are related
136. How many types of the degree of crowding ?
2 types
3 types
4 types
5 types
All aren’t related
137. When the upper second permanent molar make the extraction decision, what would we check ?
Check the upper third molar
Check the degree of crowding
Check the distance for distalization
All are related
All unrelated
138. What should you do when the second premolars were absent ?
Check root formed of E
Check crown form of E
Make crown on it
Add composite
All are related
139. When the first permanent molar was extracted what’s happened in this area ?
The second premolar drifted and tilted mesially
The second permanent molar drifted and tilted distally
The space in this area were created
The teeth are good alignment in their ache
All unrelated
140. What is the flush terminal plane ?
When the distal surface of upper and lower first permanent molars are in the line each other
When the distal surface of upper and lower second permanent molars are in the line each other
When the distal surface of upper and lower first deciduous molars are in the line each other
When the distal surface of upper and lower second deciduous molars are in the line each other
All unrelated
141. The spacing distal to the lower deciduous canines and mesial to the upper deciduous canine the so-called ?
Lee way space
Primate spacing
Flus terminal plane
Free way space
All unrelated
142. Change in proportion of the head and face during growth ?
Growth of the cranial vault
Growth of the cranial base
Growth of the maxilla
Growth of the mandible
All are related
143. How many types of growth rotation ?
2 types
3 types
4 types
5 types
All unrelated
144. Growth can helps to facilitate relevant to orthodontic treatment ?
Overbite reduction
Distal movement of posterior teeth
Space closure
Functional appliance
All are related
145. During the pubertal growth spurt what appliance is the best used ?
Removable appliance
Functional appliance
Fixed appliance
All are related
All unrelated
146. Anomalies in position of teeth during eruption ?
Ectopic
Transposition
Impaction
All are related
All unrelated
147. Anomalies in form of teeth during eruption ?
Peg lateral incisors
Dilacerations
Twin teeth ( germination,fusion )
Barrel shapes
All are related
148. What cause of dilacerations during eruption of permanent central incisor ?
Early eruption
Spontaneous eruption
Trauma to deciduous teeth
Late eruption
All unrelated
149. What problem when permanent lateral incisors are missing ?
Food stagnation
Aesthetic
Difficult to eat
All are related
All unrelated
150. What a problem when permanent third molars are missing ?
Aestheitc
Difficult to eat
When 7’s need to be extracted
Cause midline shift
All unrelated
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