Ortho mey phoung 121-180
Orthodontic Knowledge Quiz
Test your understanding of orthodontic concepts and principles with our comprehensive quiz designed for students, teachers, and orthodontic enthusiasts alike.
Challenge yourself with questions covering:
- Skeletal relationships
- Tooth eruption patterns
- Orthodontic appliances
- Treatment approaches
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 ?
σ� Functional appliance
σ� Removable appliance
σ� Fixed appliance
σ� Facemask
σ� All are related
122. Why the lower inclined bite plane was indicated ?
σ� Cheap
σ� Easy to produce
σ� Poor prognosis of all the teeth in buccal segment both side
σ� No areas for retention at the buccal teeth
σ� All are related
123. Overbite normal when measure is ?
σ� 2 mm
σ� 3 mm
σ� 4 mm
σ� 5 mm
σ� All are related
124. Overjet normal when measure is ?
σ� 2 mm
σ� 3 mm
σ� 4 mm
σ� 5 mm
σ� All unrelated
125. Class II Skeletal base mean ?
σ� When the maxilla protrusive and mandible normal
σ� When the maxilla protrusive and the mandible retrusive
σ� When the mandible retrusive and the maxilla normal
σ� All are related
σ� All unrelated
126. Class III Skeletal base mean ?
σ� When the maxilla retrusive and mandible normal
σ� When the maxilla retrusive and mandible protrusive
σ� When the maxilla normal and mandible protrusive
σ� All are related
σ� All unrelared
127. Lower permanent central incisor erupt ?
σ� 9 years
σ� 8 years
σ� 7 years
σ� 6 years
σ� All unrelated
128. Lower permanent lateral incisor erupt ?
σ� 9 years
σ� 8 years
σ� 7 years
σ� 6 years
σ� All unrelated
129. Upper permanent central incisor erupt ?
σ� 9 years
σ� 8 years
σ� 7 years
σ� 6 years
σ� All unrelated
130. Upper permanent lateral incisor erupt ?
σ� 9 years
σ� 8 years
σ� 7 years
σ� 6 years
σ� All unrelated
131. A line that drop perpendicular at the distal surface of Upper and lower E’s was known ?
σ� A facial plane
σ� A flus terminal plane
σ� A lee way space
σ� A occlusal plane
σ� All unrelated
132. The Lee way space of the upper arch is ?
σ� Greater than the Lower arch
σ� Smaller than the Lower arch
σ� Lee way space are the same
σ� Lee way space upper arch is narrow
σ� All unrelated
133. When the child was 6 to 8 years old what can you see the permanent teeth had erupted ?
σ� Upper incisors
σ� Lower incisors
σ� Upper first molars
σ� Lower first miolars
σ� All are related
134. When the first permanent molar was extracted, what’s happened in this area ?
σ� The second permanent molar tilt mesially
σ� The second permanent molar tilt distally
σ� The second permanent molar extruded
σ� The second permanent molar intruded
σ� All are related
135. What’s happened when loss of the lower first permanent molar ?
σ� The lower second premolar tilt distally
σ� The lower second permanent molar tilt mesially
σ� The upper first permanent molar extruded
σ� The contact points in this area are displaced
σ� All are related
136. How many types of the degree of crowding ?
σ� 2 types
σ� 3 types
σ� 4 types
σ� 5 types
σ� All aren’t related
137. When the upper second permanent molar make the extraction decision, what would we check ?
σ� Check the upper third molar
σ� Check the degree of crowding
σ� Check the distance for distalization
σ� All are related
σ� All unrelated
138. What should you do when the second premolars were absent ?
σ� Check root formed of E
σ� Check crown form of E
σ� Make crown on it
σ� Add composite
σ� All are related
139. When the first permanent molar was extracted what’s happened in this area ?
σ� The second premolar drifted and tilted mesially
σ� The second permanent molar drifted and tilted distally
σ� The space in this area were created
σ� The teeth are good alignment in their ache
σ� All unrelated
140. What is the flush terminal plane ?
σ� When the distal surface of upper and lower first permanent molars are in the line each other
σ� When the distal surface of upper and lower second permanent molars are in the line each other
σ� When the distal surface of upper and lower first deciduous molars are in the line each other
σ� When the distal surface of upper and lower second deciduous molars are in the line each other
σ� All unrelated
141. The spacing distal to the lower deciduous canines and mesial to the upper deciduous canine the so-called ?
σ� Lee way space
σ� primate spacing
σ� Flus terminal plane
σ� Free way space
σ� All unrelated
142. Change in proportion of the head and face during growth ?
σ� Growth of the cranial vault
σ� Growth of the cranial base
σ� Growth of the maxilla
σ� Growth of the mandible
σ� All are related
143. How many types of growth rotation ?
σ� 2 types
σ� 3 types
σ� 4 types
σ� 5 types
σ� All unrelated
144. Growth can helps to facilitate relevant to orthodontic treatment ?
σ� Overbite reduction
σ� Distal movement of posterior teeth
σ� Space closure
σ� Functional appliance
σ� All are related
145. During the pubertal growth spurt what appliance is the best used ?
σ� Removable appliance
σ� Functional appliance
σ� Fixed appliance
σ� All are related
σ� All unrelated
146. Anomalies in position of teeth during eruption ?
σ� Ectopic
σ� Transposition
σ� impaction
σ� All are related
σ� All unrelated
147. Anomalies in form of teeth during eruption ?
σ� Peg lateral incisors
σ� Dilacerations
σ� twin teeth ( germination,fusion )
σ� Barrel shapes
σ� All are related
148. What cause of dilacerations during eruption of permanent central incisor ?
σ� Early eruption
σ� Spontaneous eruption
σ� Trauma to deciduous teeth
σ� Late eruption
σ� All unrelated
149. What problem when permanent lateral incisors are missing ?
σ� Food stagnation
σ� Aesthetic
σ� Difficult to eat
σ� All are related
σ� All unrelated
150. What a problem when permanent third molars are missing ?
σ� Aestheitc
σ� Difficult to eat
σ� When 7’s need to be extracted
σ� Cause midline shift
σ� All unrelated
151. What treatment options when permanent lateral incisors are missing ?
σ� create space for implants
σ� Preserve space with bridges
σ� preserve space with partial denture
σ� Closing space and shape 3 to look like 2
σ� All are related
152. Premature loss of deciduous teeth, when the C and D in unilateral loss cause ?
σ� Midline shift to the side of extraction
σ� The first permanent molars drift distally
σ� The E’s drift backwards
σ� All are related
σ� All unrelated
153. Premature loss of deciduous teeth, when the C and D in bilateral loss cause ?
σ� The first permanent molars and the E’s to drift forwards
σ� The first permanent molars and the E’s are rotated
σ� The first permanent molars and the E’s are tilting
σ� All are related
σ� All unrelated
154. Premature loss of deciduous teeth, when the E is extracted before 6 erupts ?
σ� The 6 will erupts more towards the mesial entering the premolar areas
σ� Loss of space in the arch for the premolar erupts
σ� Midline shift to the extraction side
σ� All are related
σ� All unrelated
155. Premature loss of deciduous teeth, when the E is extracted after 6 has erupted ?
σ� The 6 will tilt mesially
σ� The 6 will extrude
σ� The 6 will drift backwards
σ� Space will be created
σ� All unrelated
156. The early loss of deciduous teeth would cause ?
σ� Loss of space will be faster
σ� Loss of space will be more severe
σ� Crowding in the buccal segment
σ� All are related
σ� All unrelated
157. Treatment of early loss of deciduous teeth, balancing extraction is needed if ?
σ� The C or D is decay
σ� The C or D is missing unilaterally
σ� The C or D has crown fracture
σ� The C or D has restoration
σ� All unrelated
158. Treatment of early loss of deciduous teeth, space maintainer is can be used if ?
σ� The E is present
σ� The E has large restoration
σ� The E is lost prematurely
σ� The E has just roots
σ� All unrelated
159. Examination and Diagnosis in family and social history related to ?
σ� Hereditary factor
σ� Do they understandwhat orthodontic treatment involves
σ� How far they live
σ� Can they come regurlary
σ� All are related
160. Usually reduced face height is associated with ?
σ� Normal bite
σ� Deep bite
σ� Open bite
σ� Cross bite
σ� All unrelated
161. Excessive lower face height may be the cause of ?
σ� Anterior open bite
σ� Anterior deep bite
σ� Anterior cross bite
σ� Anterior over the bite
σ� All unrelated
162. The inclination of mandibular plane to the true horizontal or Franfort plane should be note ?
σ� A steep mandibular plane angle correlates with long anterior face height
σ� Anterior open bite malocclusion
σ� A flat mandibular plane angle correlates with short anterior face height
σ� Deep bite malocclusion
σ� 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 ?
σ� value = 2 ± 2 mm
σ� value = 2 ± 1 mm
σ� value = 2 ± 0 mm
σ� value = 0 ± 1 mm
σ� value = 1 ± 1 mm
164. The ideally of the lip line at rest position the lower lip cover between?
σ� ⅓ or ½ of the labial surface of the upper central incisor
σ� ¾ of the labial surface of the upper central incisor
σ� ⅔ of the labial surface of the upper central incisor
σ� ⅝ of the labial surface of the upper central incisor
σ� All unrelated
165. Check the soft tissue in clinical examination in extra-oral of the lip was found ?
σ� Competent or incompetent lip
σ� Lip line
σ� Lip posture
σ� Habitual position of lip
σ� All are related
166. Clinical examination of intra-oral in the labial segment was checked and found ?
σ� Incisor relationship
σ� Overbite, Overjet
σ� Centre line
σ� Any displacement on closure
σ� All are related
167. What we can see the overbite after intra-oral examination ?
σ� Reduced or deep bite
σ� Anterior open bite
σ� Complete or incomplete
σ� Trauma or non trauma
σ� All are related
168. The amount of anchorage required depend on the factor below?
σ� The number of teeth to be move
σ� The distance of teeth need to be move
σ� Force applied
σ� Root surface areas (RSA) of the teeth used for anchorage
σ� All are related
169. Which one the following types of anchorage for orthodontic treatment ?
σ� Intra-maxillary
σ� Inter-maxillary
σ� Extra-oral anchorage
σ� All are related
σ� All unrelated
170. How to minimize anchorage loss for the tooth movement ?
σ� Use force as light as possible
σ� Move minimum number of teeth at one time
σ� Increase the resistance of anchor teeth
σ� All are related
σ� All unrelated
171. The factors determining of the anchorage value ?
σ� Force magnitude
σ� Pressure distribution in the periodontal ligament
σ� Root morphology
σ� Space available
σ� All are related
172. Frankfort Horizontal is a reference plane constructed by joining which of the following landmarks ?
σ� Nasion and Sella
σ� Porion and Sella
σ� Porion and Nasion
σ� Porion and Orbital
σ� Basion and Orbital
173. The FMPA Angle was recognized and constructed by ?
σ� Frankfort to maxillary plane
σ� Frankfort to mandibular plane
σ� Frankfort to horizontal plane
σ� Frankfort to occlusal plane
σ� 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 ?
σ� The mesio-buccal groove
σ� The distal-buccal groove
σ� The distal of mesio-buccal groove
σ� The mesial of mesio-buccal groove
σ� Unrelated
175. In determining a patient's skeletal growth pattern, the most important factor is ?
σ� Diet
σ� Habits
σ� Heredity
σ� Dental occlusion
σ� Unrelated
176. The last primary tooth to be replaced by a permanent tooth is usually the ?
σ� Maxillary canine
σ� Mandibular canine
σ� Maxillary first molar
σ� Maxillary second molar
σ� Mandibular second molar
177. The factors that causes of overjet increase ?
σ� Skeletal factor
σ� Dental factor
σ� Soft tissues
σ� Habits
σ� 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 ?
σ� The upper arch is greater
σ� The lower arch is smaller
σ� The upper arch is normal
σ� The lower arch is greater
σ� Unrelated
179. The malocclusion cause by thumb sucking
σ� Procline of upper incisors
σ� Retrocline of lower incisors
σ� Anterior open bite
σ� constricted the maxilla
σ� All are related
180. Screw expansion should be turned for a week ?
σ� ¼ turn = 0.15mm
σ� ¼ turn = 0.20mm
σ� ¼ turn = 0.25mm
σ� ¼ turn = 0.30mm
σ� Unrelated
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