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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