MCQs 242 Orthodontic 5dd,Prof.Mom Sovannrithy 1st 2019

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Questions: 242 | Attempts: 418 | Updated: May 10, 2024

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MCQs 242 Orthodontic 5dd,Prof.Mom Sovannrithy 1st 2019 - Quiz

Questions and Answers

1.

Lower incline bite plane use for correcting?
- A.
  
  Simple anterior cross bite
- B.
  
  Posterior cross bite
- C.
  
  Unilateral cross bite
- D.
  
  Bilateral cross bite
Correct Answer
A. Simple anterior cross bite

Explanation
A simple anterior cross bite refers to a condition where the upper front teeth are positioned behind the lower front teeth when the jaws are closed. This can be corrected using a lower incline bite plane. The incline bite plane helps to reposition the lower jaw forward, allowing the upper and lower teeth to align properly. By using a lower incline bite plane, the anterior cross bite can be corrected, improving the alignment and function of the teeth.

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2.

What is the lower incline bite plane?
- A.
  
  An appliance for correct simple cross bite
- B.
  
  Fixed appliance
- C.
  
  Removable appliance
- D.
  
  Functional appliance
Correct Answer
A. An appliance for correct simple cross bite

Explanation
The lower incline bite plane is an appliance used to correct a simple cross bite. It can be either fixed or removable, depending on the specific needs of the patient. This appliance helps to realign the teeth and improve the bite by adjusting the lower jaw position. By using the lower incline bite plane, the cross bite can be corrected, allowing for proper alignment and function of the teeth.

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3.

Lower incline bite plane cover the teeth of ?
- A.
  
  Lower labial segment
- B.
  
  Lower buccal segment
- C.
  
  Upper labial segment
- D.
  
  Upper buccal segment
Correct Answer
A. Lower labial segment

Explanation
The lower incline bite plane covers the teeth of the lower labial segment. This means that the lower incline bite plane is designed to protect and cover the teeth in the front of the lower jaw. It helps to provide stability and support to the lower labial segment, ensuring proper alignment and function of the teeth in that area.

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4.

Lower incline bite plane we make incline in?
- A.
  
  45 degree
- B.
  
  30 degree
- C.
  
  15 degree
- D.
  
  60 degree
Correct Answer
A. 45 degree

Explanation
The correct answer is 45 degrees because a lower incline bite plane is typically made with a 45-degree incline. This angle allows for proper alignment of the teeth and jaw, providing optimal comfort and function for the patient. A 45-degree incline also helps to distribute the biting forces evenly, reducing the risk of excessive wear or damage to the teeth.

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5.

How many bend orders is the most comment use in orthodontic?
- A.
  
  3
- B.
  
  2
- C.
  
  4
- D.
  
  5
Correct Answer
A. 3

Explanation
The most common use in orthodontics is to have 3 bend orders.

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6.

What is the 2nd bend order mean?
- A.
  
  Tiping
- B.
  
  Torqueing
- C.
  
  In-out
- D.
  
  Up-down
Correct Answer
A. Tiping

Explanation
The 2nd bend order refers to the bending of a material or object in a specific direction. In this context, "Tiping" is the correct answer as it indicates the bending of the object in a tipping or tilting motion. The other options, such as torqueing, in-out, and up-down, do not accurately describe the specific type of bend order being referred to in the question.

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7.

The most comment used of wire in fixed appliance is?
- A.
  
  Rectangular and round
- B.
  
  Round and triangle
- C.
  
  Rectangular and triangle
- D.
  
  Bending wires
Correct Answer
A. Rectangular and round

Explanation
The correct answer is rectangular and round. This is because rectangular and round wires are commonly used in fixed appliances. These types of wires provide stability and durability to the appliances, allowing them to function properly. Rectangular wires are often used for structural support, while round wires are used for electrical connections. The combination of rectangular and round wires ensures that the appliance is secure and can effectively perform its intended tasks.

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8.

How many direction do fixed appliance can do?
- A.
  
  6
- B.
  
  4
- C.
  
  5
- D.
  
  3
Correct Answer
A. 6

Explanation
Fixed appliances can typically perform six different directions: up, down, left, right, forward, and backward. This allows for flexibility and movement in various orientations, making them versatile and adaptable for different purposes.

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9.

Which one is the auxiliaries’ component in fixed appliance?
- A.
  
  Power chain
- B.
  
  Brackets
- C.
  
  Wire
- D.
  
  Molar bend
Correct Answer
A. Power chain

Explanation
The auxiliaries' component in fixed appliance is the power chain. The power chain is a series of elastic or metal links that are used to connect the brackets and apply continuous force to move the teeth. It is typically placed around the brackets and helps in closing gaps, aligning teeth, and correcting bite issues. The power chain is an essential part of fixed appliances like braces and plays a crucial role in the orthodontic treatment process.

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10.

What is the clinical feature of fixed appliance?
- A.
  
  Bonded bracket to the teeth
- B.
  
  Fixed brackets to removable appliance
- C.
  
  Bonded bracket to an appliance
- D.
  
  The appliance that can be remove
Correct Answer
A. Bonded bracket to the teeth

Explanation
The clinical feature of a fixed appliance is the bonding of brackets to the teeth. This means that the brackets are attached to the teeth using dental adhesive, providing a stable and permanent fixation. This allows for the application of forces to the teeth to correct alignment and bite issues. The other options mentioned in the question, such as fixed brackets to a removable appliance or a removable appliance, do not accurately describe the clinical feature of a fixed appliance.

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11.

What is the most common appliances to avoid for adult orthodontic?
- A.
  
  Head Gear and Face Mask
- B.
  
  Removable appliance
- C.
  
  Fixed appliance
- D.
  
  Lingual brace
Correct Answer
A. Head Gear and Face Mask

Explanation
Head gear and face masks are not common appliances for adult orthodontic treatment. These appliances are typically used in younger patients to correct severe skeletal discrepancies. In adult orthodontics, removable appliances, fixed appliances, and lingual braces are more commonly used. Removable appliances are often used for minor tooth movements, while fixed appliances (such as braces) are used for more complex cases. Lingual braces are similar to traditional braces but are placed on the inner surface of the teeth, making them less visible. Therefore, the correct answer is head gear and face mask.

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12.

What is the problem can increased risk of root resorption:?
- A.
  
  No vital or root treated
- B.
  
  Long roots.
- C.
  
  Previously caries
- D.
  
  Light forces
Correct Answer
A. No vital or root treated

Explanation
The increased risk of root resorption can be attributed to teeth that have not undergone any vital or root treatment. This means that these teeth have not received any necessary dental procedures to address issues such as infection or decay, which can lead to root resorption. Without proper treatment, the risk of root resorption is higher.

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13.

What is the risk of orthodontic treatment?
- A.
  
  Root resorption
- B.
  
  Carries
- C.
  
  Periodontal disease
- D.
  
  Bone fracture
Correct Answer
A. Root resorption

Explanation
Root resorption is a potential risk of orthodontic treatment. It occurs when the roots of the teeth begin to break down or dissolve, leading to their eventual loss. This can be caused by the pressure exerted on the teeth during orthodontic treatment, as well as other factors such as genetics or previous dental trauma. While root resorption is relatively rare, it is a concern that orthodontists must be aware of and monitor during treatment. Regular dental check-ups and X-rays can help detect any signs of root resorption early on, allowing for appropriate intervention if necessary.

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14.

What is the most comment risk in orthodontic treatment?
- A.
  
  Relapse
- B.
  
  Retention
- C.
  
  Over correction
- D.
  
  Good digitation
Correct Answer
A. Relapse

Explanation
Relapse is the most common risk in orthodontic treatment. After the braces are removed, there is a tendency for the teeth to shift back to their original positions. This can happen due to various factors such as inadequate retention, inadequate follow-up, or not wearing the prescribed retainers. Therefore, it is crucial for patients to diligently follow the orthodontist's instructions regarding retention to prevent relapse and maintain the desired results achieved through orthodontic treatment.

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15.

What is the meaning of balancing extraction?
- A.
  
  Extraction Both side in one arch
- B.
  
  Extraction upper and lower tooth in both side
- C.
  
  Extraction upper and lower tooth in one side
- D.
  
  Both side in two arches
Correct Answer
A. Extraction Both side in one arch

Explanation
Balancing extraction refers to the removal of teeth from both sides of the mouth within a single dental arch. This means that an equal number of teeth are extracted from both the left and right sides of either the upper or lower jaw. This technique is often used in orthodontic treatments to create a balanced and symmetrical dental arch, ensuring proper alignment and bite.

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16.

What is the meaning of compensating extraction?
- A.
  
  Upper and lower teeth in both arches
- B.
  
  Upper and lower tooth in one side
- C.
  
  Both side in one arch
- D.
  
  Both side in two arches
Correct Answer
A. Upper and lower teeth in both arches

Explanation
Compensating extraction refers to the removal of upper and lower teeth in both arches. This procedure is often done to achieve balance and proper alignment between the upper and lower teeth. By extracting teeth from both arches, any discrepancies in the bite can be corrected, resulting in improved function and aesthetics.

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17.

Why we use retainer after finishing orthodontic treatment?
- A.
  
  Preventing teeth relapse
- B.
  
  Allow teeth eruption
- C.
  
  Allow growth change
- D.
  
  Prevent 3rd molars eruption
Correct Answer
A. Preventing teeth relapse

Explanation
After finishing orthodontic treatment, it is important to use a retainer to prevent teeth relapse. This is because the teeth have been moved into their new positions through braces or aligners, and without the retainer, they may gradually shift back to their original positions. The retainer helps to maintain the alignment achieved during treatment and ensures that the teeth remain in their corrected positions. By wearing a retainer, the risk of teeth relapse is minimized, and the results of the orthodontic treatment are preserved.

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18.

What is the factor related to retention to be consider at the treatment planning stage?
- A.
  
  Type of retention
- B.
  
  Growth spurt
- C.
  
  Extraction decision
- D.
  
  Growth modification
Correct Answer
A. Type of retention

Explanation
At the treatment planning stage, one of the factors related to retention that needs to be considered is the type of retention. This refers to the method or appliance that will be used to maintain the corrected position of the teeth after orthodontic treatment. The type of retention chosen will depend on various factors such as the patient's specific orthodontic needs, the complexity of the case, and the desired outcome. Different types of retention options include removable retainers, fixed retainers, or a combination of both. The choice of retention is crucial in ensuring that the teeth remain in their corrected position and that the treatment results are maintained in the long term.

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19.

Which one the factor may modify retention protocol?
- A.
  
  Lower incisors alignment
- B.
  
  Crowding
- C.
  
  Missing teeth
- D.
  
  Dental caries
Correct Answer
A. Lower incisors alignment

Explanation
Lower incisors alignment may modify the retention protocol because the alignment of the lower incisors plays a crucial role in the stability of the orthodontic treatment. If the lower incisors are not properly aligned, it can lead to relapse or shifting of the teeth after the braces are removed. Therefore, in order to ensure long-term retention of the teeth in their corrected positions, the retention protocol may need to be adjusted based on the alignment of the lower incisors.

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20.

What is the condition that requires short term retention?
- A.
  
  Deep bite
- B.
  
  Expanded arches
- C.
  
  Serial extraction procedures
- D.
  
  Midline shift
Correct Answer
A. Deep bite

Explanation
Short term retention is a condition that requires the individual to maintain a deep bite, where the upper front teeth excessively overlap the lower front teeth. This is because deep bites can cause various dental issues, such as tooth wear, gum recession, and jaw joint problems. Therefore, short term retention is necessary to prevent further complications and maintain proper dental alignment.

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21.

Which condition that require long term retention?
- A.
  
  Severe rotation
- B.
  
  High place canines in class one extraction cases
- C.
  
  Posterior cross bite in patients having step cusp
- D.
  
  Extraction cases
Correct Answer
A. Severe rotation

Explanation
Severe rotation is a condition that requires long-term retention because it involves the misalignment of teeth, where a tooth is rotated or twisted out of its normal position. In order to correct this condition, orthodontic treatment is typically needed, which may involve the use of braces or other appliances. After the treatment, it is important to maintain long-term retention to prevent the rotated tooth from shifting back to its original position. Retention can be achieved through the use of retainers or other orthodontic devices to ensure that the corrected tooth remains in its proper alignment.

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22.

Which condition that does not require retention?
- A.
  
  Anterior cross bite
- B.
  
  Sever rotation
- C.
  
  Median diastema
- D.
  
  Deep bite
Correct Answer
A. Anterior cross bite

Explanation
An anterior cross bite refers to a misalignment of the upper and lower front teeth, where the lower teeth are positioned in front of the upper teeth. Unlike the other conditions listed, which involve misalignments or gaps between teeth that require retention (such as braces or retainers) to correct, an anterior cross bite can often be corrected without the need for retention. Treatment options for anterior cross bite may include orthodontic appliances, such as braces or a palatal expander, to gradually shift the teeth into proper alignment. Therefore, an anterior cross bite is the only condition listed that does not necessarily require retention.

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23.

Which classification of malocclusion, Over jet is increased?
- A.
  
  Class II division 1 malocclusion
- B.
  
  Class III malocclusion
- C.
  
  Class II division 2 malocclusion
- D.
  
  Class I malocclusion
Correct Answer
A. Class II division 1 malocclusion

Explanation
In Class II division 1 malocclusion, the overjet is increased. Overjet refers to the horizontal distance between the upper and lower incisors when the teeth are in a biting position. In this type of malocclusion, the upper front teeth are significantly protruded and stick out over the lower front teeth. This causes an increased overjet. Class II division 1 malocclusion is characterized by a retruded lower jaw and an overdeveloped upper jaw, leading to a prominent overbite and a deep overjet.

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1
0
24.

Which one is the Over jet of Class I malocclusion?
- A.
  
  Upper incisors are Proclined and OJ =3mm
- B.
  
  Upper incisors are Proclined and OJ < 2mm
- C.
  
  Upper incisors are Retroclined OJ = 1mm
- D.
  
  Upper incisors are Proclined and OJ>4mm
Correct Answer
A. Upper incisors are Proclined and OJ =3mm

Explanation
Overjet refers to the horizontal distance between the upper and lower incisors. In Class I malocclusion, the upper incisors are proclined, meaning they are inclined or tilted forward. A proclined upper incisor with an overjet of 3mm indicates a Class I malocclusion. This means that the upper incisors are positioned more forward than the lower incisors by 3mm.

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25.

Which one the most likely the Over jet of Class II division1 malocclusion?
- A.
  
  Upper incisors are Proclined, OJ>4mm
- B.
  
  Upper incisors are Proclined, OJ < 2mm
- C.
  
  Upper incisors are Retroclined , OJ = 1mm
- D.
  
  Upper incisors are Proclined, OJ =3mm
Correct Answer
A. Upper incisors are Proclined, OJ>4mm

Explanation
In Class II division 1 malocclusion, the upper incisors are typically proclined, meaning they are inclined or tilted forward. The overjet (OJ) refers to the horizontal distance between the upper and lower incisors. A measurement of OJ greater than 4mm is most likely in Class II division 1 malocclusion, indicating a significant protrusion of the upper incisors.

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26.

Which is the Over jet of Class II division 2 malocclusion?
- A.
  
  Upper incisors are retroclined, OJ
- B.
  
  Upper incisors are retroclined ,OJ = 1 mm
- C.
  
  Upper incisors are Proclined, OJ>4mm
- D.
  
  Upper incisors are proclined , OJ =3mm
Correct Answer
A. Upper incisors are retroclined, OJ

Explanation
The correct answer is "Upper incisors are retroclined, OJ". In Class II division 2 malocclusion, the upper incisors are retroclined, meaning they are inclined towards the back of the mouth. The overjet (OJ) refers to the horizontal distance between the upper and lower incisors. In this case, the overjet is not specified, but it can be assumed to be within normal limits or slightly increased since there is no mention of a significant protrusion of the upper incisors.

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27.

Which one the most likely the Over jet of Class III malocclusion?
- A.
  
  Upper incisors are Proclined OJ
- B.
  
  Upper incisors are Proclined, OJ > 3mm
- C.
  
  Upper incisors are Proclined and OJ>7mm
- D.
  
  Upper incisors are Proclined and OJ =3mm
Correct Answer
A. Upper incisors are Proclined OJ

Explanation
The correct answer is "Upper incisors are Proclined OJ". This answer suggests that the upper incisors are proclined, meaning they are tilted forward, and there is overjet present. Overjet refers to the horizontal distance between the upper and lower incisors. In Class III malocclusion, the lower jaw is positioned more forward than the upper jaw, causing the upper incisors to be proclined and potentially resulting in increased overjet.

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28.

When the lower incisor edges lie posterior to the cingulum plateau of the upper incisor and Upper incisors are Proclined?
- A.
  
  Class II div 1
- B.
  
  Class I
- C.
  
  Class II DIV 2
- D.
  
  Class III
Correct Answer
A. Class II div 1

Explanation
When the lower incisor edges lie posterior to the cingulum plateau of the upper incisor and the upper incisors are proclined, it indicates a Class II div 1 malocclusion. In this type of malocclusion, the upper front teeth are positioned more forward than normal, causing an increased overjet (horizontal distance between the upper and lower incisors). The lower incisors being positioned posterior to the cingulum plateau of the upper incisor further confirms the Class II div 1 malocclusion.

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29.

When the lower incisor edges lie posterior to the cingulum plateau of the upper incisor with retrocline?
- A.
  
  Class II DIV 2
- B.
  
  Class I malocclusion
- C.
  
  Class II div 1
- D.
  
  Class III
Correct Answer
A. Class II DIV 2

Explanation
When the lower incisor edges lie posterior to the cingulum plateau of the upper incisor with retrocline, it indicates Class II DIV 2 malocclusion. In this type of malocclusion, the upper incisors are retroclined (tilted towards the tongue) and the lower incisors are positioned posteriorly (behind) the upper incisors. This results in a deep overbite and a characteristic "V" shape in the upper arch. Class II DIV 2 malocclusion is typically characterized by a retrusive upper jaw and a normal or retrusive lower jaw.

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30.

When the lower incisor edges occlude into cingulum plateau of the upper is?
- A.
  
  Class I
- B.
  
  Class II div 1
- C.
  
  Class II DIV 2
- D.
  
  Class III
Correct Answer
A. Class I

Explanation
When the lower incisor edges occlude into the cingulum plateau of the upper incisors, it is classified as Class I malocclusion. This means that the upper and lower teeth are properly aligned and there is no significant overbite or underbite. Class I malocclusion is considered to be the ideal occlusion.

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31.

When the lower incisor edges lie Anterior to the cingulum plateau of the upper?
- A.
  
  Class III
- B.
  
  Class I
- C.
  
  Class II div 1
- D.
  
  Class II DIV 2
Correct Answer
A. Class III

Explanation
When the lower incisor edges lie anterior to the cingulum plateau of the upper, it indicates a Class III malocclusion. In this type of occlusion, the lower jaw is positioned further forward than the upper jaw, causing the lower incisors to overlap the upper incisors. This results in a "underbite" appearance, where the lower teeth protrude in front of the upper teeth when the jaws are closed. Class III malocclusions are typically treated with orthodontic interventions to correct the alignment of the teeth and jaws.

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32.

Which one is OJ of the Class I malocclusion?
- A.
  
  Average
- B.
  
  Increase
- C.
  
  Decrease
- D.
  
  Severe
Correct Answer
A. Average

Explanation
The correct answer is "Average" because Class I malocclusion refers to a dental condition where the upper teeth slightly overlap the lower teeth. It is considered the most common and mildest form of malocclusion, with the teeth being in a relatively normal position. This means that the severity of the misalignment is not significant, hence the term "average" is the appropriate choice.

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33.

Which one is the most likely OJ for Class II div 1 malocclusion?
- A.
  
  Increase
- B.
  
  Decrease
- C.
  
  Average
- D.
  
  Severe
Correct Answer
A. Increase

Explanation
In Class II div 1 malocclusion, the upper front teeth are protruded or stick out more than normal, causing an overbite. To correct this malocclusion, the most likely treatment option is to increase the overjet, which is the horizontal distance between the upper and lower front teeth. By increasing the overjet, the upper front teeth can be moved backward, aligning them with the lower front teeth and improving the overall bite.

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34.

Which one is OJ of Class III malocclusion?
- A.
  
  Decrease
- B.
  
  Increase
- C.
  
  Average
- D.
  
  Severe
Correct Answer
A. Decrease

Explanation
The correct answer is "Decrease" because Class III malocclusion refers to a condition where the lower jaw protrudes forward, causing the lower teeth to overlap the upper teeth. In this case, the term "decrease" implies that the protrusion of the lower jaw is reduced or becomes less prominent, indicating an improvement in the malocclusion.

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35.

Which one is likely Overbite in Class I malocclusion?
- A.
  
  20-30%
- B.
  
  0-10%
- C.
  
  10-20%
- D.
  
  50-80%
Correct Answer
A. 20-30%

Explanation
In Class I malocclusion, the upper teeth slightly overlap the lower teeth, causing an overbite. The correct answer of 20-30% suggests that approximately 20-30% of individuals with Class I malocclusion are likely to have an overbite.

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36.

Which plane we use to find Overbite?
- A.
  
  Vertical
- B.
  
  Transversal
- C.
  
  Horizontal
- D.
  
  Posterior-anterior
Correct Answer
A. Vertical

Explanation
The vertical plane is used to find overbite. Overbite is the vertical overlap of the upper and lower teeth when the jaws are closed. By examining the vertical relationship between the upper and lower teeth, dentists and orthodontists can determine the amount of overbite present and plan the appropriate treatment. The other options, transversal, horizontal, and posterior-anterior planes, do not specifically relate to the measurement or assessment of overbite.

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37.

Which one is Overbite in Class III malocclusion?
- A.
  
  0-10%
- B.
  
  40-60%
- C.
  
  20-30%
- D.
  
  50-80%
Correct Answer
A. 0-10%

Explanation
In Class III malocclusion, the overbite refers to the vertical overlap of the upper and lower front teeth. A normal overbite ranges from 20-30%, but in Class III malocclusion, the overbite is reduced or even reversed, resulting in a negative overbite or an underbite. Therefore, the correct answer is 0-10% as it indicates a reduced or negative overbite.

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38.

Which is ANB of Class I skeletal pattern?
- A.
  
  2-4 degree
- B.
  
  1-2 degree
- C.
  
  4-6 degree
- D.
  
  6-8 degree
Correct Answer
A. 2-4 degree

Explanation
Class I skeletal pattern refers to a normal relationship between the upper and lower jaws. In this pattern, the upper jaw aligns properly with the lower jaw. The ANB angle is a measurement used to determine the severity of skeletal discrepancies. A Class I skeletal pattern typically has an ANB angle within the range of 2-4 degrees. Therefore, the correct answer is 2-4 degrees.

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39.

Which one is the most likely ANB angle in Class II skeletal pattern?
- A.
  
  6-8 degree
- B.
  
  1-2 degree
- C.
  
  2-4 degree
- D.
  
  3-4 degree
Correct Answer
A. 6-8 degree

Explanation
The ANB angle is a measurement used in orthodontics to assess the relationship between the upper and lower jaws. In a Class II skeletal pattern, the upper jaw is positioned further forward than the lower jaw. A larger ANB angle indicates a more severe Class II skeletal pattern. Therefore, the most likely ANB angle in Class II skeletal pattern would be 6-8 degrees, as this range suggests a significant discrepancy between the positions of the upper and lower jaws.

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40.

What is the ANB angle in Class III skeletal pattern?
- A.
  
  0-1 degree
- B.
  
  2-4 degree
- C.
  
  4-6 degree
- D.
  
  6-8 degree
Correct Answer
A. 0-1 degree

Explanation
The ANB angle in Class III skeletal pattern is 0-1 degree. This means that the upper jaw (maxilla) is positioned slightly behind the lower jaw (mandible), resulting in a more pronounced lower jaw and a retruded upper jaw. This angle measurement helps to diagnose and classify the severity of the skeletal discrepancy in Class III malocclusions.

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41.

Which one is the best treatment for crowding?
- A.
  
  Extraction
- B.
  
  Closing space
- C.
  
  Derotation
- D.
  
  Proclined upper incisors
Correct Answer
A. Extraction

Explanation
Extraction is considered the best treatment for crowding because it involves removing one or more teeth to create more space in the mouth. This allows the remaining teeth to align properly and reduces the crowding. Other treatments like closing space, derotation, or proclining upper incisors may not be as effective in addressing the issue of crowding.

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42.

For spacing which one is the best treatment?
- A.
  
  Closing space
- B.
  
  Extraction
- C.
  
  Derotation
- D.
  
  Proclined upper incisors
Correct Answer
A. Closing space

Explanation
Closing space is the best treatment for spacing because it involves bringing the teeth closer together to eliminate the gaps between them. This can be done through various orthodontic methods such as braces or aligners, which apply gentle pressure to move the teeth into the desired position. By closing the space, the teeth can be aligned properly, improving both the appearance and functionality of the smile. Extraction, derotation, and proclined upper incisors are not relevant to spacing and may not address the issue effectively.

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43.

Which is the common treatment for tooth rotation?
- A.
  
  Derotation
- B.
  
  Closing space
- C.
  
  Extraction
- D.
  
  Proclined upper incisors
Correct Answer
A. Derotation

Explanation
Derotation is the common treatment for tooth rotation. This involves using orthodontic techniques to gradually realign the rotated tooth into its correct position. By applying gentle pressure and using various appliances, such as braces or aligners, the tooth can be guided back into alignment over time. This treatment helps to improve the aesthetics and function of the teeth, ensuring proper alignment and bite.

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44.

Which one is the best treatment for anterior cross bite?
- A.
  
  Proclined upper incisors
- B.
  
  Closing space
- C.
  
  Extraction
- D.
  
  Derotation
Correct Answer
A. Proclined upper incisors

Explanation
Proclined upper incisors are the best treatment for anterior cross bite because they involve moving the upper front teeth forward, which helps correct the misalignment of the upper and lower teeth. This treatment approach aims to bring the upper teeth into the correct position, allowing for a proper bite and alignment of the jaws. By proclining the upper incisors, the bite can be corrected, improving both the function and aesthetics of the teeth and jaws.

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45.

Which one is orthodontic treatment for spacing teeth?
- A.
  
  Space closure
- B.
  
  Crown bridge
- C.
  
  Implant
- D.
  
  Space closures
Correct Answer
A. Space closure

Explanation
Space closure is the orthodontic treatment for spacing teeth. This involves moving the teeth together to close the gaps or spaces between them. It is a common treatment used to correct gaps caused by missing teeth, small teeth, or natural spacing issues. Crown bridge and implant are not specifically orthodontic treatments for spacing teeth, as they are more focused on replacing missing teeth rather than closing gaps.

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46.

What is the most comment decision for making crown bridge?
- A.
  
  Spacing
- B.
  
  Crowding
- C.
  
  Rotation
- D.
  
  Tooth impacted
Correct Answer
A. Spacing

Explanation
The most common decision for making a crown bridge is spacing. This means that when a patient has gaps or spaces between their teeth, a crown bridge can be used to fill in these spaces and create a more even and uniform appearance. This is a common treatment option for individuals who have naturally occurring gaps between their teeth or for those who have lost a tooth and need to fill the space. By using a crown bridge, the dentist can effectively close the gaps and improve the overall aesthetics and functionality of the patient's smile.

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47.

Which one is the most comment decision for extraction teeth?
- A.
  
  Crowding
- B.
  
  Spacing
- C.
  
  Rotation
- D.
  
  Tooth impacted
Correct Answer
A. Crowding

Explanation
Crowding is the most common reason for extraction of teeth. When there is not enough space in the mouth for all the teeth to properly align, crowding occurs. This can lead to various dental issues such as misalignment, overlapping, and difficulty in cleaning the teeth. To alleviate the crowding and create space for proper alignment, extraction of one or more teeth may be necessary. Extraction helps in improving the overall oral health and preventing further complications.

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48.

A 12 years old girl come to orthodontics department at the UHS to check her teeth she complain of her front teeth are sticky out both arches with incompetent lips and her facial profile is more convexity . Which one is the most likely clinical feature of this sign?
- A.
  
  Bimaxillary protrusion
- B.
  
  Crowding
- C.
  
  Spacing
- D.
  
  Rotation
Correct Answer
A. Bimaxillary protrusion

Explanation
The most likely clinical feature of the given signs is bimaxillary protrusion. The description of the girl's front teeth sticking out in both arches, along with incompetent lips and a more convex facial profile, suggests that her upper and lower jaws are protruding forward, causing an excessive prominence of the front teeth. This condition is known as bimaxillary protrusion. Crowding refers to teeth that are crowded or overlapped, spacing refers to gaps between teeth, and rotation refers to teeth that are twisted or rotated.

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49.

A 12 years old girl come to orthodontics department at the UHS to check her teeth she complain of her front teeth are sticky out both arches with tongue trust and her facial profile is more convexity . Which one is the most likely clinical feature of lips?
- A.
  
  Incompetent lips
- B.
  
  Competent lips
- C.
  
  Everted lips
- D.
  
  Inverted lips
Correct Answer
A. Incompetent lips

Explanation
Incompetent lips are the most likely clinical feature in this case. The girl's complaint of her front teeth sticking out with tongue thrust suggests that her lips are unable to close properly, resulting in the protrusion of the teeth. The mention of a more convex facial profile also supports this, as incompetent lips can contribute to a convex appearance.

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50.

A 12 years old girl come to orthodontics department at the UHS to check her teeth she complain of her front teeth are sticky out both arches with incompetent lips and her facial profile is more convexity . Which one is the most likely cause by?
- A.
  
  Tongue trust
- B.
  
  Lips trap
- C.
  
  Moth breaching
- D.
  
  Thumb sucking
Correct Answer
A. Tongue trust

Explanation
The most likely cause for the 12-year-old girl's complaint of her front teeth sticking out, incompetent lips, and a more convex facial profile is tongue thrust. Tongue thrust is a swallowing pattern where the tongue pushes against or between the front teeth during swallowing, speech, or at rest. This constant pressure can cause the teeth to shift forward and create an overjet. Additionally, the incompetent lips and convex facial profile are common signs of tongue thrust.

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MCQs 242 Orthodontic 5dd,Prof.Mom Sovannrithy 1st 2019

Lower incline bite plane use for correcting?

What is the lower incline bite plane?

Lower incline bite plane cover the teeth of ?

Lower incline bite plane we make incline in?

How many bend orders is the most comment use in orthodontic?

What is the 2nd bend order mean?

The most comment used of wire in fixed appliance is?

How many direction do fixed appliance can do?

Which one is the auxiliaries’ component in fixed appliance?

What is the clinical feature of fixed appliance?

What is the most common appliances to avoid for adult orthodontic?

What is the problem can increased risk of root resorption:?

What is the risk of orthodontic treatment?

What is the most comment risk in orthodontic treatment?

What is the meaning of balancing extraction?

What is the meaning of compensating extraction?

Why we use retainer after finishing orthodontic treatment?

What is the factor related to retention to be consider at the treatment planning stage?

Which one the factor may modify retention protocol?

What is the condition that requires short term retention?

Which condition that require long term retention?

Which condition that does not require retention?

Which classification of malocclusion, Over jet is increased?

Which one is the Over jet of Class I malocclusion?

Which one the most likely the Over jet of Class II division1 malocclusion?

Which is the Over jet of Class II division 2 malocclusion?

Which one the most likely the Over jet of Class III malocclusion?

When the lower incisor edges lie posterior to the cingulum plateau of the upper incisor and Upper incisors are Proclined?

When the lower incisor edges lie posterior to the cingulum plateau of the upper incisor with retrocline?

When the lower incisor edges occlude into cingulum plateau of the upper is?

When the lower incisor edges lie Anterior to the cingulum plateau of the upper?

Which one is OJ of the Class I malocclusion?

Which one is the most likely OJ for Class II div 1 malocclusion?

Which one is OJ of Class III malocclusion?

Which one is likely Overbite in Class I malocclusion?

Which plane we use to find Overbite?

Which one is Overbite in Class III malocclusion?

Which is ANB of Class I skeletal pattern?

Which one is the most likely ANB angle in Class II skeletal pattern?

What is the ANB angle in Class III skeletal pattern?

Which one is the best treatment for crowding?

For spacing which one is the best treatment?

Which is the common treatment for tooth rotation?

Which one is the best treatment for anterior cross bite?

Which one is orthodontic treatment for spacing teeth?

What is the most comment decision for making crown bridge?

Which one is the most comment decision for extraction teeth?

A 12 years old girl come to orthodontics department at the UHS to check her teeth she complain of her front teeth are sticky out both arches with incompetent lips and her facial profile is more convexity . Which one is the most likely clinical feature of this sign?

A 12 years old girl come to orthodontics department at the UHS to check her teeth she complain of her front teeth are sticky out both arches with tongue trust and her facial profile is more convexity . Which one is the most likely clinical feature of lips?

A 12 years old girl come to orthodontics department at the UHS to check her teeth she complain of her front teeth are sticky out both arches with incompetent lips and her facial profile is more convexity . Which one is the most likely cause by?