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

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  • 1/242 Questions

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

    • No vital or root treated
    • Long roots.
    • Previously caries
    • Light forces
Please wait...
About This Quiz

This quiz, created by Prof. Mom Sovannrithy in 2019, focuses on orthodontic techniques like the lower incline bite plane, used for correcting simple anterior cross bites.

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

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  • 2. 

    What is the most comment risk in orthodontic treatment?

    • Relapse

    • Retention

    • Over correction

    • 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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  • 3. 

    Why we use retainer after finishing orthodontic treatment?

    • Preventing teeth relapse

    • Allow teeth eruption

    • Allow growth change

    • 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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  • 4. 

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

    • Class II div 1

    • Class I

    • Class II DIV 2

    • 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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  • 5. 

    Which causes can make Root resorption?

    • Exceesive force

    • Light force

    • Optional force

    • Ideal force

    Correct Answer
    A. Exceesive force
    Explanation
    Excessive force can cause root resorption, which is the breakdown or destruction of the root structure of a tooth. When excessive force is applied to a tooth, it can lead to inflammation and damage to the surrounding tissues, including the root. This can result in the resorption of the root, weakening the tooth and potentially leading to tooth loss if left untreated. Light force, optional force, and ideal force are not typically associated with causing root resorption.

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  • 6. 

    Which one is the most harmful effects of orthodontics tooth movement?

    • Root resorption

    • Change position of teeth

    • Healthy gum

    • Reconstruction bone

    Correct Answer
    A. Root resorption
    Explanation
    Root resorption is the most harmful effect of orthodontic tooth movement. This refers to the loss of root structure, which can weaken the teeth and potentially lead to tooth loss. Root resorption can occur due to the pressure applied during orthodontic treatment, causing the roots to break down. It is important for orthodontists to monitor and minimize the risk of root resorption during treatment to ensure the long-term health and stability of the teeth.

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  • 7. 

    Which appliance can correct anterior cross bite?

    • Removable appliance within Z spring or T spring and posterior bite plane

    • Orthognatic surgery

    • Retainer

    • Class II twinblock

    Correct Answer
    A. Removable appliance within Z spring or T spring and posterior bite plane
    Explanation
    A removable appliance with a Z spring or T spring and a posterior bite plane can correct anterior cross bite. This appliance helps to realign the upper and lower teeth by applying pressure on the affected area and promoting proper alignment. It is a non-invasive and reversible treatment option that can be used to correct the cross bite without the need for orthognathic surgery or a retainer. The Class II twinblock is not specifically designed to correct anterior cross bite, so it is not the correct answer.

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  • 8. 

    Clinical feature of Anterior Open Bite?

    • Long face

    • Lips competent

    • Deep bite

    • Cross bite

    Correct Answer
    A. Long face
    Explanation
    The clinical feature of an anterior open bite is a long face. This means that the patient's face appears elongated or vertically stretched. This can be observed when the distance between the forehead and chin is greater than usual. An anterior open bite is a condition where there is a lack of vertical overlap between the upper and lower front teeth when the mouth is closed. It can be caused by factors such as thumb sucking, tongue thrusting, or skeletal abnormalities.

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  • 9. 

    Which one is more likely components for Expansion arch?

    • Screw expansion

    • Z- spring

    • Labial bow

    • Adam Spring

    Correct Answer
    A. Screw expansion
    Explanation
    The correct answer is Screw expansion. Screw expansion is a commonly used component in orthodontics for widening the upper jaw. It is designed to apply pressure on the palatal bones, causing them to separate and create more space. This technique is often used to correct narrow arches and improve the alignment of teeth. Z-spring, labial bow, and Adam Spring are other components used in orthodontics, but they are not specifically designed for expansion purposes.

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  • 10. 

    Which one is not Active Component?

    • South end clasp

    • T-spring

    • Z- spring

    • Finger spring

    Correct Answer
    A. South end clasp
    Explanation
    A south end clasp is not an active component. Active components are those that actively generate or control electrical signals, such as transistors or diodes. A south end clasp, on the other hand, is a type of dental clasp used in dentures to provide stability and retention. It does not generate or control any electrical signals, making it a passive component in this context.

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  • 11. 

    Which Active Component can use as retention?

    • Labial bow

    • T-spring

    • Robert retractor

    • Finger spring

    Correct Answer
    A. Labial bow
    Explanation
    A labial bow can be used as a retention component. It is a wire appliance that is placed on the labial surface of the teeth to provide stability and prevent relapse after orthodontic treatment. The labial bow helps to maintain the position of the teeth and prevent them from shifting back to their original position. It is commonly used in removable orthodontic appliances to provide retention and support to the teeth.

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  • 12. 

    Which one is the cause of Anterior cross bite?

    • Premature contact/ pseudo class III

    • Retained lower deciduous incisors

    • Small lower arch and very broad Upper arch

    • Missing lower teeth

    Correct Answer
    A. Premature contact/ pseudo class III
    Explanation
    Premature contact or pseudo class III is the cause of anterior cross bite. This refers to a situation where the upper teeth come in contact with the lower teeth before they are supposed to, leading to a misalignment of the bite. This can result in an anterior cross bite, where the lower front teeth are positioned in front of the upper front teeth when biting down.

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  • 13. 

    Which is the more likely clinical feature of Class II division 2 malocclusion:?

    • Retroclined upper central Incisors with OJ reduced

    • Overjet reverse

    • Open bite

    • Procline upper incisors

    Correct Answer
    A. Retroclined upper central Incisors with OJ reduced
    Explanation
    The more likely clinical feature of Class II division 2 malocclusion is retroclined upper central incisors with OJ reduced. This means that the upper front teeth are tilted backward and the overjet (horizontal distance between the upper and lower front teeth) is reduced. This is a characteristic feature of Class II division 2 malocclusion, where the upper front teeth are positioned more towards the tongue and the lower front teeth.

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  • 14. 

    Malocclusion means ?

    • Irregularities of teeth

    • Normal alignment of teeth

    • Misaligned teeth with traumatic bite

    • Open bite

    Correct Answer
    A. Irregularities of teeth
    Explanation
    Malocclusion refers to the irregularities or misalignment of teeth. It can include various dental problems such as crowded teeth, crooked teeth, overbite, underbite, or crossbite. This condition can cause difficulties in chewing, speaking, and maintaining oral hygiene. Treatment for malocclusion may involve braces, retainers, or other orthodontic procedures to correct the alignment of teeth and improve overall oral health.

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  • 15. 

    Which one is Angle’s classification of malocclusion?

    • Molars relationship

    • Incisors relationship

    • Canine relationship

    • Premolars relationship

    Correct Answer
    A. Molars relationship
    Explanation
    Angle's classification of malocclusion is a system used to categorize different types of misalignment of the teeth and jaws. It is based on the relationship between the upper and lower molars. The classification includes three categories: Class I, Class II, and Class III. Class I refers to normal occlusion, where the molars are properly aligned. Class II refers to an overbite, where the upper molars are positioned more forward than the lower molars. Class III refers to an underbite, where the lower molars are positioned more forward than the upper molars. Therefore, the correct answer is "Molars relationship."

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  • 16. 

    In case of open bite FMA angle may be?

    • Increase

    • Low

    • Medium

    • Decrease

    Correct Answer
    A. Increase
    Explanation
    In the case of an open bite, the FMA angle may increase. An open bite is a dental condition where there is a lack of vertical overlap between the upper and lower teeth when the mouth is closed. The FMA angle refers to the angle formed between the Frankfort horizontal plane (a line connecting the external auditory meatus and the infraorbital rim) and the mandibular plane (a line connecting the lower border of the mandible). An increase in the FMA angle indicates an increase in the vertical position of the mandible, which can contribute to the development or exacerbation of an open bite.

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  • 17. 

    In class II div 2 malocclusion, the upper incisors are?

    • Retroclined

    • Proclined

    • Upright

    • Rotated

    Correct Answer
    A. Retroclined
    Explanation
    In class II div 2 malocclusion, the upper incisors are retroclined. This means that the upper incisors are inclined or tilted towards the back of the mouth. This is a common characteristic of class II div 2 malocclusion, where the upper front teeth are positioned in a more retruded or backward position compared to the lower front teeth. This can result in an overbite or deep bite, where the upper front teeth overlap the lower front teeth excessively.

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  • 18. 

    When the maxillary back teeth placed inside of mandibular teeth only one side called?

    • Unilateral cross bite

    • Anterior cross bite

    • Deep bite

    • Bilateral cross bite

    Correct Answer
    A. Unilateral cross bite
    Explanation
    Unilateral cross bite refers to a dental condition where the maxillary back teeth are positioned inside the mandibular teeth on only one side of the mouth. This means that the upper teeth on one side of the mouth are biting on the inside of the lower teeth on the same side. It is important to address this issue as it can cause problems with the bite alignment and overall dental health.

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  • 19. 

    Which clinical feature we can see anterior cross bite?

    • Skeletal III

    • Broad maxillary

    • Short mandible

    • Class II division 2 malocclusion

    Correct Answer
    A. Skeletal III
    Explanation
    Anterior crossbite is a condition where the upper front teeth are positioned behind the lower front teeth. Skeletal III refers to a skeletal class III malocclusion, which is characterized by a lower jaw that is more prominent than the upper jaw. This can result in an anterior crossbite because the lower jaw is positioned forward, causing the upper front teeth to be behind the lower front teeth. Therefore, the presence of a skeletal class III malocclusion, or Skeletal III, is associated with anterior crossbite.

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  • 20. 

    In class I malocclusion which is the most comment seen?

    • Rotation and crowding

    • Anterior Crossbite

    • Increase OJ

    • Deep bite

    Correct Answer
    A. Rotation and crowding
    Explanation
    Rotation and crowding is the most common malocclusion seen in class I. This refers to the misalignment of teeth, where some teeth may be rotated or twisted, and there is insufficient space for all the teeth to fit properly in the dental arch. This can result in overlapping or crowded teeth, which can affect the overall alignment and appearance of the teeth.

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  • 21. 

    A very high tongue in the roof of the mouth may causes ?

    • Wide upper arch & narrow lower arch

    • Cross bite

    • Crowding

    • Median diastema

    Correct Answer
    A. Wide upper arch & narrow lower arch
    Explanation
    A very high tongue in the roof of the mouth can cause a wide upper arch and a narrow lower arch. The tongue plays a crucial role in shaping the arches of the mouth during development. If the tongue is positioned too high, it can exert pressure on the roof of the mouth, causing the upper arch to widen and the lower arch to narrow. This can lead to issues such as cross bite, crowding, and even the development of a median diastema (gap between the front teeth).

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  • 22. 

    How many types of cross bite classification?

    • 2

    • 1

    • 3

    • 4

    Correct Answer
    A. 2
    Explanation
    There are two types of cross bite classification.

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  • 23. 

    Which clinical feature of anterior open bite?

    • Anterior teeth are not overlaps

    • LFH reduce

    • Anterior teeth are deep overlaps

    • Short face

    Correct Answer
    A. Anterior teeth are not overlaps
    Explanation
    The correct answer is "Anterior teeth are not overlaps." This clinical feature refers to a condition where the front teeth do not overlap each other when the mouth is closed. This can result in a visible gap between the upper and lower front teeth.

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  • 24. 

    Abnormal tooth mobility is because?

    • Abnormal resorption of the root e.g. in periodontal disease

    • Used light force.

    • Appliance worn full-time

    • Good oral hygiene

    Correct Answer
    A. Abnormal resorption of the root e.g. in periodontal disease
    Explanation
    Abnormal tooth mobility can occur due to abnormal resorption of the root, such as in periodontal disease. Periodontal disease is a condition that affects the supporting structures of the teeth, including the gums and bone. In this disease, the bacteria in dental plaque cause inflammation and infection, leading to the destruction of the tissues that support the teeth. As a result, the root of the tooth may become resorbed, causing abnormal mobility. The other options, such as using light force, wearing an appliance full-time, and good oral hygiene, do not directly contribute to abnormal tooth mobility in the same way as periodontal disease.

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  • 25. 

    Tooth pain when we move it because?

    • Too much forces

    • Tooth move

    • Bone lost

    • Gingivitis

    Correct Answer
    A. Too much forces
    Explanation
    When we experience tooth pain when we move it, it is likely due to excessive forces being applied to the tooth. This can occur when we bite down too hard or grind our teeth. The excessive forces can cause the tooth to become sensitive and painful. It is important to address this issue as it can lead to further dental problems if left untreated.

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  • 26. 

    The most comment reasons for relapse is?

    • Rotation and spacing

    • Good digitation

    • Full unit class I,II,III

    • Enough OB

    Correct Answer
    A. Rotation and spacing
    Explanation
    The most common reasons for relapse in orthodontic treatment are rotation and spacing. Rotation refers to the misalignment of teeth where they are not properly aligned with each other, causing them to rotate or twist. Spacing refers to gaps or spaces between teeth, which can occur due to various factors such as tooth extraction or improper alignment. These issues can lead to relapse if not properly addressed during orthodontic treatment, as the teeth may gradually shift back to their original positions.

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  • 27. 

    Adam Clasps ភាគច្រើនគេដាក់នៅលើធ្មេញណាមួយ?

    • Strong and healthy teeth

    • Big and painful teeth

    • Deep caries teeth

    • Periodontitis teeth

    Correct Answer
    A. Strong and healthy teeth
  • 28. 

    តើលួសសំរាប់ធ្វើ Z-spring មានទំហ៊ំប៉ុន្មាន?

    • 0.5mm

    • 0.7mm

    • 0.4mm

    • 0.6mm

    Correct Answer
    A. 0.5mm
  • 29. 

    Cross bite should be corrected immediately because it can cause:?

    • Asymmetrical development of the jaw

    • Crowding

    • Spacing

    • Root resorption

    Correct Answer
    A. Asymmetrical development of the jaw
    Explanation
    Cross bite should be corrected immediately because it can lead to asymmetrical development of the jaw. This occurs when the upper and lower jaws do not align properly, causing one side of the jaw to grow more than the other. This can result in facial asymmetry and functional problems such as difficulty in chewing and speaking. Early intervention is important to prevent further complications and ensure proper jaw development.

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  • 30. 

    The clinical feature of Class II division 1?

    • Proclined upper incisors

    • Overjet reduce

    • ANB < 4degree

    • Anterior Crossbite

    Correct Answer
    A. Proclined upper incisors
    Explanation
    The clinical feature of Class II division 1 is proclined upper incisors. This means that the upper front teeth are inclined or tilted forward, giving the appearance of protrusion. This is a characteristic feature of Class II division 1 malocclusion, which is characterized by a discrepancy between the upper and lower jaws, with the upper jaw being more prominent. Other features of Class II division 1 malocclusion may include a reduced overjet (horizontal distance between the upper and lower incisors), an ANB angle of less than 4 degrees (indicating a more retrusive lower jaw), and the possibility of an anterior crossbite (where the upper front teeth bite behind the lower front teeth).

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  • 31. 

    In class II division 2 malocclusion FMPA angle may be?

    • Reduce

    • Increase

    • Medium

    • Normal

    Correct Answer
    A. Reduce
    Explanation
    In class II division 2 malocclusion, the FMPA angle may be reduced. This is because class II division 2 malocclusion is characterized by a retruded mandible, meaning that the lower jaw is positioned further back than normal. The FMPA angle, which stands for Frankfort-Mandibular Plane Angle, measures the relationship between the upper jaw and the lower jaw. In this malocclusion, the reduced FMPA angle indicates the retrusion of the mandible, contributing to the class II division 2 malocclusion.

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  • 32. 

    What is the Malocclusion means?

    • Irregularities of teeth

    • Normal alignment of teeth

    • Aligned teeth

    • Good digitation

    Correct Answer
    A. Irregularities of teeth
    Explanation
    Malocclusion refers to the misalignment or irregular positioning of the teeth when the jaws are closed. It can manifest as crowded teeth, gaps between teeth, overbite, underbite, or crossbite. Therefore, the correct answer is "Irregularities of teeth." This term is used to describe any deviation from the normal alignment of teeth.

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  • 33. 

    Tongue thrust is Effect of?

    • Proclination of anterior teeth with open bite

    • Retroclination of anterior teeth

    • Decreased over jet

    • Crowding

    Correct Answer
    A. Proclination of anterior teeth with open bite
    Explanation
    The correct answer is proclination of anterior teeth with open bite. Tongue thrust refers to the habit of pushing the tongue against the front teeth during swallowing or speaking. This constant pressure can cause the front teeth to tilt forward, leading to proclination. Additionally, the pressure from the tongue can also cause an open bite, where the upper and lower front teeth do not meet when biting down. Therefore, tongue thrust is the effect of proclination of anterior teeth with open bite.

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  • 34. 

    How to keep space in early lost of deciduous teeth?

    • Space Maintainer

    • Extraction

    • Correction Of Thumb Sucking

    • Distalise molars

    Correct Answer
    A. Space Maintainer
    Explanation
    A space maintainer is used to keep space in the early loss of deciduous teeth. When a baby tooth is lost prematurely, a space maintainer is placed to prevent neighboring teeth from shifting into the empty space. This helps to maintain the correct spacing for the permanent teeth that will eventually erupt. By keeping the space open, the space maintainer ensures that there is enough room for the permanent teeth to come in properly aligned. Extraction, correction of thumb sucking, and distalising molars are not directly related to keeping space in early loss of deciduous teeth.

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  • 35. 

    When the midline of upper and lower not in a line was call ?

    • Central Line Shifting

    • Displacement

    • Crowding

    • Spacing

    Correct Answer
    A. Central Line Shifting
    Explanation
    Central line shifting refers to the displacement of the midline of the upper and lower teeth, resulting in them not being in a straight line. This can occur due to various factors such as tooth loss, dental crowding, or orthodontic treatment. It can affect the overall aesthetics and alignment of the teeth, leading to an uneven smile. Therefore, central line shifting is the correct term to describe this condition.

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  • 36. 

    In case of class II division 1 malocclusion lips are?

    • Incompetent lips

    • Competent

    • Potentially competent

    • Everted lips

    Correct Answer
    A. Incompetent lips
    Explanation
    In class II division 1 malocclusion, the lips are typically incompetent. This means that they are unable to fully close or rest together without effort. This is often due to the upper front teeth protruding significantly over the lower front teeth, causing the lips to be unable to meet properly. As a result, the lips may appear open or have a gap between them when the mouth is at rest.

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  • 37. 

    Lower incline bite plane use for correcting?

    • Simple anterior cross bite

    • Posterior cross bite

    • Unilateral cross bite

    • 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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  • 38. 

    Which Classification of Malocclusion when the OJ is increase?

    • Class II div1

    • Class I

    • Class II div 2

    • Class III

    Correct Answer
    A. Class II div1
    Explanation
    When the OJ (overjet) is increased, it refers to a condition where the upper front teeth protrude significantly over the lower front teeth. This is commonly known as a "class II div1" malocclusion. In this type of malocclusion, the upper teeth are positioned too far forward in relation to the lower teeth, resulting in an increased overjet. Therefore, class II div1 is the correct answer in this case.

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  • 39. 

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

    • Type of retention

    • Growth spurt

    • Extraction decision

    • 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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  • 40. 

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

    • Increase

    • Decrease

    • Average

    • 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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  • 41. 

    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 kind of malocclusion?

    • Open bite

    • Deep bite

    • Cross bite

    • Scissors bit

    Correct Answer
    A. Open bite
    Explanation
    Based on the given information, the most likely kind of malocclusion is an open bite. An open bite is characterized by a lack of vertical overlap between the front teeth when the back teeth are closed together. In this case, the girl's complaint of her front teeth sticking out and her facial profile having more convexity suggests that her front teeth are not properly aligned, resulting in an open bite.

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  • 42. 

    Which Classification of Malocclusion when the OJ Normal?

    • Class I

    • Class II div1

    • Class II div 2

    • Class III

    Correct Answer
    A. Class I
    Explanation
    The correct answer is class I. This classification of malocclusion refers to a normal occlusion where the upper and lower jaws are properly aligned and the bite is normal. Class I malocclusion is considered the ideal occlusion, where the upper teeth slightly overlap the lower teeth, and there are no major dental or skeletal discrepancies.

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  • 43. 

    Choose the correct components for reduce OJ?

    • Robert retractor

    • Z- spring

    • T- spring

    • Bucal canin retractor

    Correct Answer
    A. Robert retractor
    Explanation
    The correct components for reducing OJ are the Robert retractor. The other options listed, such as Z-spring, T-spring, and Bucal canin retractor, are not suitable for this purpose.

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  • 44. 

    In case of open bite LFH may be?

    • Increase

    • Low

    • Medium

    • Decrease

    Correct Answer
    A. Increase
    Explanation
    In the case of an open bite, the lower facial height (LFH) may increase. An open bite refers to a dental condition where there is a gap between the upper and lower teeth when the mouth is closed. This can cause the lower jaw to grow more vertically, leading to an increase in the lower facial height.

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  • 45. 

    The clinical feature of tongue thrust is?

    • Proclined of anterior teeth in both arch

    • Reduce over jet

    • Anterior cross bite

    • Crowding

    Correct Answer
    A. Proclined of anterior teeth in both arch
    Explanation
    Tongue thrust refers to the habit of pushing the tongue against the front teeth during swallowing or at rest. This constant pressure can cause the anterior teeth in both arches to become proclined or pushed forward. As a result, the teeth may appear more prominent and protruded. Therefore, the correct answer is "Proclined of anterior teeth in both arch."

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  • 46. 

    The overlapping of the upper interior teeth over the lowers in the vertical plane is call?

    • Overbite

    • Overjet

    • Openbite

    • Cross bite

    Correct Answer
    A. Overbite
    Explanation
    Overbite refers to the overlapping of the upper interior teeth over the lowers in the vertical plane. This occurs when the upper front teeth extend too far over the lower front teeth. It is a common dental condition and can lead to various issues such as difficulty in biting and chewing, speech problems, and potential damage to the teeth and gums. Orthodontic treatment is often required to correct an overbite and improve the overall alignment of the teeth.

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  • 47. 

    មូលហេតុអ្វីដែលធ្វើអោយមាន Root resorption?

    • Heavy force

    • Good oral hygiene

    • Light force

    • Tipping movement

    Correct Answer
    A. Heavy force
    Explanation
    Root resorption occurs when there is excessive pressure or force applied to the teeth. Heavy force can cause the roots of the teeth to be resorbed, leading to their deterioration. This can happen due to various reasons such as trauma, orthodontic treatment, or grinding of teeth. Good oral hygiene, light force, and tipping movement do not cause root resorption.

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  • 48. 

    Harmful effects of orthodontics tooth movement?

    • Root resorption

    • Caries

    • Spacing

    • Crowding

    Correct Answer
    A. Root resorption
    Explanation
    Root resorption is a potential harmful effect of orthodontic tooth movement. It refers to the loss or destruction of the root structure of a tooth. During orthodontic treatment, excessive force or pressure applied to the teeth can cause the roots to resorb, leading to their shortening or even complete loss. This can weaken the teeth and compromise their stability. Therefore, it is important for orthodontists to carefully monitor the forces applied during treatment to minimize the risk of root resorption.

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  • 49. 

    When mesio-buccal cusp of upper first permanent molar occluding forward of the buccal groove of the lower first permanent molar is call?

    • Class II molar relationship

    • Class I molar relationship

    • Class III molar relationship

    • Class I skeletal pattern

    Correct Answer
    A. Class II molar relationship
    Explanation
    When the mesio-buccal cusp of the upper first permanent molar occludes (or comes into contact) forward of the buccal groove of the lower first permanent molar, it is known as a Class II molar relationship. In this relationship, the upper molars are positioned more anteriorly (forward) in relation to the lower molars. This can result in an overbite and a protrusive appearance of the upper teeth. It is a common malocclusion that may require orthodontic treatment to correct.

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  • May 10, 2024
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  • Mar 07, 2020
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