ortho mey phoung 121-180
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 ?
Functional appliance
Removable appliance
Fixed 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
151. What treatment options when permanent lateral incisors are missing ?
create space for implants
Preserve space with bridges
preserve space with partial denture
Closing space and shape 3 to look like 2
All are related
152. Premature loss of deciduous teeth, when the C and D in unilateral loss cause ?
Midline shift to the side of extraction
The first permanent molars drift distally
The E’s drift backwards
All are related
All unrelated
153. Premature loss of deciduous teeth, when the C and D in bilateral loss cause ?
The first permanent molars and the E’s to drift forwards
The first permanent molars and the E’s are rotated
The first permanent molars and the E’s are tilting
All are related
All unrelated
154. Premature loss of deciduous teeth, when the E is extracted before 6 erupts ?
The 6 will erupts more towards the mesial entering the premolar areas
Loss of space in the arch for the premolar erupts
Midline shift to the extraction side
All are related
All unrelated
155. Premature loss of deciduous teeth, when the E is extracted after 6 has erupted ?
The 6 will tilt mesially
The 6 will extrude
The 6 will drift backwards
Space will be created
All unrelated
156. The early loss of deciduous teeth would cause ?
Loss of space will be faster
Loss of space will be more severe
Crowding in the buccal segment
All are related
All unrelated
157. Treatment of early loss of deciduous teeth, balancing extraction is needed if ?
The C or D is decay
The C or D is missing unilaterally
The C or D has crown fracture
The C or D has restoration
All unrelated
158. Treatment of early loss of deciduous teeth, space maintainer is 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
159. Examination and Diagnosis in family and social history related to ?
Hereditary factor
Do they understandwhat orthodontic treatment involves
How far they live
Can they come regurlary
All are related
160. Usually reduced face height is associated with ?
Normal bite
Deep bite
Open bite
Cross bite
All unrelated
161. Excessive lower face height may be the cause of ?
Anterior open bite
Anterior deep bite
Anterior cross bite
Anterior over the bite
All unrelated
162. The inclination of mandibular plane to the true horizontal or Franfort plane should be note ?
A steep mandibular plane angle correlates with long anterior face height
Anterior open bite malocclusion
A flat mandibular plane angle correlates with short anterior face height
Deep bite malocclusion
All are related
163. 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 Chinese Norm is ?
value = 2 ± 2 mm
value = 2 ± 1 mm
value = 2 ± 0 mm
value = 0 ± 1 mm
value = 1 ± 1 mm
164. The ideally of the lip line at rest position the lower lip cover between?
⅓ or ½ of the labial surface of the upper central incisor
¾ of the labial surface of the upper central incisor
⅔ of the labial surface of the upper central incisor
⅝ of the labial surface of the upper central incisor
All unrelated
165. Check the soft tissue in clinical examination in extra-oral of the lip was found ?
Competent or incompetent lip
Lip line
Lip posture
Habitual position of lip
All are related
166. Clinical examination of intra-oral in the labial segment was checked and found ?
Incisor relationship
Overbite, Overjet
Centre line
Any displacement on closure
All are related
167. What we can see the overbite after intra-oral examination ?
Reduced or deep bite
Anterior open bite
Complete or incomplete
Trauma or non trauma
All are related
168. The amount of anchorage required depend on the factor below?
The number of teeth to be move
The distance of teeth need to be move
Force applied
Root surface areas (RSA) of the teeth used for anchorage
All are related
169. Which one the following types of anchorage for orthodontic treatment ?
Intra-maxillary
Inter-maxillary
Extra-oral anchorage
All are related
All unrelated
170. How to minimize anchorage loss for the tooth movement ?
Use force as light as possible
Move minimum number of teeth at one time
Increase the resistance of anchor teeth
All are related
All unrelated
171. The factors determining of the anchorage value ?
Force magnitude
Pressure distribution in the periodontal ligament
Root morphology
Space available
All are related
172. Frankfort Horizontal is a reference plane constructed by joining which of the following landmarks ?
Nasion and Sella
Porion and Sella
Porion and Nasion
Porion and Orbital
Basion and Orbital
173. The FMPA Angle was recognized and constructed by ?
Frankfort to maxillary plane
Frankfort to mandibular plane
Frankfort to horizontal plane
Frankfort to occlusal plane
Frankfort to SN plane
174. The Molar relationship class II was known as the mesio-buccal cusp of the upper first permanent molar occlude to the lower first permanent molar at ?
The mesio-buccal groove
The distal-buccal groove
The distal of mesio-buccal groove
The mesial of mesio-buccal groove
Unrelated
175. In determining a patient's skeletal growth pattern, the most important factor is ?
Diet
Habits
Heredity
Dental occlusion
Unrelated
176. The last primary tooth to be replaced by a permanent tooth is usually the ?
Maxillary canine
Mandibular canine
Maxillary first molar
Maxillary second molar
Mandibular second molar
177. The factors that causes of overjet increase ?
Skeletal factor
Dental factor
Soft tissues
Habits
All are related
178. A child at 5-6 years with molar class II, later stage the first molar become class I. The causes of the leeway space in ?
The upper arch is greater
The lower arch is smaller
The upper arch is normal
The lower arch is greater
Unrelated
179. The malocclusion cause by thumb sucking
Procline of upper incisors
Retrocline of lower incisors
Anterior open bite
constricted the maxilla
All are related
180. Screw expansion should be turned for a week ?
¼ turn = 0.15mm
¼ turn = 0.20mm
¼ turn = 0.25mm
¼ turn = 0.30mm
Unrelated
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