MCQs 215 Operative Dentistry 3dd Khov Sok 2018 Updated

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    នៅក្នុង components of the dental exam, Extra-oral Examination ត្រូវពិនិត្យ:

    • TMJ + Eyes + Face + Neck (Lymph node)
    • TMJ + Eyes
    • Face
    • Neck (Lymph node)
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About This Quiz

The MCQs 215 Operative Dentistry 3DD Khov Sok 2018 Updated quiz focuses on aspects of operative dentistry, including radiographic interpretation, visual methods for lesion detection, and fluoride toothpaste concentration. It assesses key skills in identifying dental conditions and appropriate fluoride treatments.

Radiography Quizzes & Trivia

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  • 2. 

    Vital pulp therapy includes 2 therapeutic approaches :

    • ទាំង២ខាងលើ

    • Indirect pulp capping in case of deep dentinal cavities

    • Direct pulp capping/pulpotomy in case of pulp exposure

    • Endodontic

    Correct Answer
    A. ទាំង២ខាងលើ
    Explanation
    The correct answer is "ទាំង២ខាងលើ" which means "both of the above". This means that vital pulp therapy includes both indirect pulp capping in case of deep dentinal cavities and direct pulp capping/pulpotomy in case of pulp exposure.

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  • 3. 

    នៅក្នុង components of the dental exam, General History ត្រូវកត់ត្រា:

    • ទាំងអស់ខាងលើ

    • Name + Age + Address

    • Systemic Diseases

    • Major Complaint

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    In the components of the dental exam, the General History section should include the patient's name, age, and address. Additionally, it should also include information about any systemic diseases the patient may have and their major complaint.

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  • 4. 

    Caries active/high risk:

    • មានឃើញនូវ active lesion និងចំនួនកើនឡើងនៃ lesion លើសពី2 ក្នុងអំឡុងពេល ២ទៅ ៣ ឆ្នាំ

    • មិនមានឃើញនូវ active lesion និងចំនួនកើនឡើងនៃ lesionទេ

    • មានឃើញនូវ active lesion ប៉ុន្តែមិនមានឃើញនូវចំនូនកើនឡើងនៃ lesion ទេ

    • ទាំងអស់ខាងលើ

    Correct Answer
    A. មានឃើញនូវ active lesion និងចំនួនកើនឡើងនៃ lesion លើសពី2 ក្នុងអំឡុងពេល ២ទៅ ៣ ឆ្នាំ
  • 5. 

    Fluorosis is the appearance of:

    • Chalky white opaque flecks

    • Opacity white

    • Translucent white

    • Dark brown

    Correct Answer
    A. Chalky white opaque flecks
    Explanation
    Fluorosis is a condition that occurs due to excessive intake of fluoride. It causes the appearance of chalky white opaque flecks on the teeth. These flecks are a result of the mineralization of enamel, which becomes discolored and appears white and opaque. This condition is commonly seen in areas with high levels of fluoride in the water or from the excessive use of fluoride toothpaste. It is important to note that fluorosis is a cosmetic issue and does not usually cause any health problems.

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  • 6. 

    Enamel Hypoplasia caused by:

    • ទាំងអស់ខាងលើ

    • Systemic childhood infectious diseases

    • Trauma, high fever

    • Malnutrition, or hypomineralize

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    Enamel hypoplasia is a condition where the enamel, the outer layer of the teeth, is not formed properly. It can be caused by various factors such as systemic childhood infectious diseases, trauma, high fever, malnutrition, or hypomineralization. These factors can disrupt the normal development of the enamel, leading to its incomplete formation.

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  • 7. 

    Enamel Hypoplasia appear as:

    • Chalky white or brown spot on the teeth

    • Translucent white or black spot on the teeth

    • Translucent white or brown spot on the teeth

    • Translucent white or white spot on the teeth

    Correct Answer
    A. Chalky white or brown spot on the teeth
    Explanation
    Enamel hypoplasia is a condition where the enamel on the teeth is underdeveloped or thin. This can result in the appearance of chalky white or brown spots on the teeth. These spots may indicate areas of enamel that are weaker and more prone to decay or damage. Therefore, the correct answer is "Chalky white or brown spot on the teeth."

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  • 8. 

    Bruxism commonly cause by:

    • ទាំងអស់ខាងលើ

    • Habit,

    • Clenching

    • Complex neuromuscular activity and Stress

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    Bruxism is commonly caused by a combination of factors including habit, clenching, complex neuromuscular activity, and stress. These factors contribute to the grinding and clenching of teeth, which can occur during the day or while sleeping. The habit of bruxism can be developed over time and may be exacerbated by stress and tension. Clenching of the jaw and complex neuromuscular activity also play a role in bruxism. Overall, these factors work together to cause bruxism.

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  • 9. 

    Dental caries គឺជា:

    • ជំងឺ microbial

    • ជំងឺកើតដោយសារដង្កូវ

    • ជំងឺកើតឡើងដោយសារដុសធ្មេញខ្លាំង

    • ជំងឺកើតឡើងដោយសារអាស៊ីតក្រពះ

    Correct Answer
    A. ជំងឺ microbial
    Explanation
    Dental caries is a microbial disease. This means that it is caused by microorganisms, specifically bacteria, that are present in the mouth. These bacteria feed on sugars and produce acids as a byproduct, which then erode the tooth enamel and lead to the formation of cavities. Therefore, the correct answer is "ជំងឺ microbial" which means "microbial disease" in English.

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  • 10. 

    Erosion affected area:

    • Labial/palatal surfaces maxillary anteriors, occlusal/buccal surfaces of lower molars

    • Only occlusal surface

    • Only palatal surface

    • Only Buccal surface

    Correct Answer
    A. Labial/palatal surfaces maxillary anteriors, occlusal/buccal surfaces of lower molars
    Explanation
    The correct answer is "Labial/palatal surfaces maxillary anteriors, occlusal/buccal surfaces of lower molars". This answer suggests that erosion affects both the labial/palatal surfaces of maxillary anteriors (front teeth in the upper jaw) and the occlusal/buccal surfaces of lower molars (back teeth in the lower jaw). This means that erosion can occur on the outer and inner surfaces of the front teeth in the upper jaw, as well as on the chewing surfaces and outer surfaces of the back teeth in the lower jaw.

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  • 11. 

    នៅក្នុង Dental trauma, luxation :

    • ទាំងអស់ខាងលើ

    • Tooth is displaced in a labial

    • Tooth is displaced in lingual or lateral direction

    • Fractures of supporting alveolus may occur

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    In dental trauma, luxation refers to the displacement of a tooth. The tooth can be displaced in a labial (towards the lips) direction or in a lingual or lateral (towards the tongue or cheek) direction. Additionally, fractures of the supporting alveolus, the bone socket that holds the tooth, may occur.

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  • 12. 

    នៅក្នុង components of the dental exam, Soft Tissue Examination ត្រូវពិនិត្យ:

    • ទាំងអស់ខាងលើ

    • Cheeks + mucosa

    • Lips + palate + tonsil area

    • Tongue and floor of the mouth

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The correct answer is to examine all of the above components, including the cheeks + mucosa, lips + palate + tonsil area, and tongue and floor of the mouth.

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  • 13. 

    Liner, they act as cavity sealers and may have the additional therapeutic benefits of:

    • ទាំងអស់ខាងលើ

    • Fluoride release

    • Adhesion to tooth structure

    • Antibacterial properties

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The given answer states that all of the above options are correct. This means that liners not only act as cavity sealers, but they also have the additional therapeutic benefits of fluoride release, adhesion to tooth structure, and antibacterial properties.

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  • 14. 

    Operative dentistry is the art and science of:

    • All are correct

    • The diagnosis,

    • Treatment,

    • Prognosis of defects of teeth

    Correct Answer
    A. All are correct
    Explanation
    Operative dentistry encompasses the diagnosis, treatment, and prognosis of defects of teeth. This field combines both the art and science of dental care, focusing on restoring and preserving the natural function and appearance of teeth. By addressing various dental issues such as cavities, tooth decay, and other defects, operative dentistry aims to improve overall oral health and restore proper dental function.

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  • 15. 

    The following are the art and science of operative dentistry, except:

    • Api-cectomy

    • The diagnosis,

    • Treatment,

    • Prognosis of defects of teeth

    Correct Answer
    A. Api-cectomy
    Explanation
    The given question is asking for the exception among the options listed, which include Api-cectomy, diagnosis, treatment, and prognosis of defects of teeth. Api-cectomy is the correct answer because it does not fall under the category of operative dentistry. Operative dentistry primarily focuses on the diagnosis, treatment, and prognosis of defects of teeth, whereas Api-cectomy is a surgical procedure performed to remove the apex of a tooth root. Therefore, Api-cectomy is not part of operative dentistry.

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  • 16. 

    The advantage of rubber dam:

    • All are correct

    • Reduce contamination

    • Airway protection

    • Prevention of bacteria

    Correct Answer
    A. All are correct
    Explanation
    The advantage of using a rubber dam is that it can reduce contamination, provide airway protection, and prevent the spread of bacteria. By isolating the tooth being worked on, the rubber dam helps to prevent saliva, blood, and other contaminants from entering the area, ensuring a clean and sterile environment. It also protects the patient's airway by preventing any instruments or materials from accidentally entering the throat. Additionally, the rubber dam acts as a barrier, preventing the spread of bacteria from the oral cavity to other parts of the mouth.

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  • 17. 

    The disadvantage of rubber dam:

    • All are correct

    • Difficult breathing

    • Extra time

    • Patient discomfort

    Correct Answer
    A. All are correct
    Explanation
    The disadvantage of using a rubber dam is that all of the given options are correct. It can make breathing difficult for the patient, as it covers the mouth and nose. It also requires extra time to set up and remove, which can prolong the dental procedure. Additionally, some patients may experience discomfort or anxiety while wearing the rubber dam.

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  • 18. 

    Class VI, carious lesions on:

    • Cusp tip of posterior teeth

    • Incisal edges of anterior teeth

    • Occlusal surfaces of posterior teeth

    • Proximal surfaces of posterior teeth

    Correct Answer
    A. Cusp tip of posterior teeth
    Explanation
    The carious lesions on the cusp tip of posterior teeth are the correct answer because caries commonly occur in this area due to the presence of deep pits and fissures that can trap food particles and bacteria. The cusp tip is also more susceptible to decay because it is harder to clean and can be missed during brushing. Additionally, the cusp tip is subjected to greater occlusal forces during chewing, making it more prone to wear and decay.

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  • 19. 

    Dental caries can be diagnosed:

    • All are correct

    • At chair-side examination

    • During intra-oral examination

    • When the carious lesion progress

    Correct Answer
    A. All are correct
    Explanation
    All of the options listed are correct for diagnosing dental caries. Dental caries can be diagnosed through chair-side examination, which involves visually inspecting the teeth for signs of decay. It can also be diagnosed during intra-oral examination, which involves using dental instruments to examine the teeth and detect any cavities or lesions. Additionally, dental caries can be diagnosed when the carious lesion progresses, meaning that as the decay advances, it becomes more apparent and easier to diagnose. Therefore, all of these methods are valid for diagnosing dental caries.

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  • 20. 

    Bi-wing technique is to find:

    • Carie class II

    • Carie class I

    • Carie class III

    • Carie class V

    Correct Answer
    A. Carie class II
    Explanation
    The bi-wing technique is used to find caries class II. This technique involves using two wing extensions on either side of the cavity preparation to provide additional retention and resistance form. It is commonly used for caries in the proximal surfaces of molars and premolars, where the cavity extends beyond the contact area.

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  • 21. 
    Which one do you like? - ProProfs

    Which one do you like?

    • Option 1

    • Option 2

    • Option 3

    • Option 4

    Correct Answer
    A. Option 1
    Explanation
    This question is asking for a personal preference. The correct answer is Option 1, indicating that the person likes Option 1 the most out of the given options.

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  • 22. 

    នៅពេលពិនិត្យអ្នកជំងឺ ទន្តបណ្ឌិតចាំបាច់ត្រូវធ្វើការសំរេចចិត្តដូចខាងក្រោម:

    • ទាំងអស់ខាងលើ

    • Diagnosis + Prognosis

    • Treatment option and treatment planning

    • Prevention of further disease + Restoration

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    During the examination of a patient, it is important to perform a diagnosis to determine the nature and cause of the illness. This is followed by a prognosis, which involves predicting the likely course and outcome of the disease. Once the diagnosis and prognosis are established, treatment options and planning can be discussed with the patient. This may involve medication, surgery, or other interventions. Additionally, efforts should be made to prevent further disease progression and restore the patient's health. This may include lifestyle changes, preventive measures, and rehabilitation.

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  • 23. 

    Definition of direct pulp capping:

    • Techniques for treating a pulp exposure with a material that seal over the exposure site and promote the reparative dentin formation with maintaining pulp vitality

    • It is a procedure in which only the infected dentin caries is removed

    • The cavity is sealed with a bactericidal agent

    • ទាំងអស់ខាងលើ

    Correct Answer
    A. Techniques for treating a pulp exposure with a material that seal over the exposure site and promote the reparative dentin formation with maintaining pulp vitality
    Explanation
    Direct pulp capping refers to the technique of treating a pulp exposure by sealing the exposure site with a material. This material not only seals the site but also promotes the formation of reparative dentin while maintaining the vitality of the pulp. This procedure involves removing only the infected dentin caries and sealing the cavity with a bactericidal agent.

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  • 24. 

    Indication of Indirect pulp capping:

    • ទាំងអស់ខាងលើ

    • No pulp exposure + No pain history

    • No evidence of pathosis or caries invaded

    • Clinical signs and symptoms of vitality

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The given answer suggests that all the above-mentioned indications must be present for indirect pulp capping. This means that there should be no pulp exposure and no history of pain. Additionally, there should be no evidence of any disease or decay invading the tooth, and the tooth should show clinical signs and symptoms of vitality.

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  • 25. 

    Indirect restorations may require:

    • 2 or more visits

    • 1 visit

    • ទាំង២ខាងលើ

    • ទាំងអស់ខាងលើ

    Correct Answer
    A. 2 or more visits
    Explanation
    Indirect restorations, such as crowns or bridges, often require multiple visits to complete. This is because the process involves taking impressions of the teeth, fabricating the restoration in a dental laboratory, and then fitting and cementing the restoration onto the tooth. These steps typically cannot be done in a single visit, as the restoration needs to be custom-made and adjusted for a proper fit and bite. Therefore, the correct answer is that indirect restorations may require 2 or more visits.

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  • 26. 

    Restorative materials ចែកចេញជា ២ ប្រភេទគឺ:

    • Temporary restorative materials + Permanent restorative materials

    • Surgery material + endodontic material

    • Prosthodontic material + orthodontic material

    • ទាំងអស់ខាងលើ

    Correct Answer
    A. Temporary restorative materials + Permanent restorative materials
    Explanation
    Restorative materials can be divided into two main categories: temporary restorative materials and permanent restorative materials. Temporary restorative materials are used for short-term purposes, such as filling a cavity until a permanent filling can be placed. Permanent restorative materials, on the other hand, are used for long-term purposes and are designed to withstand the daily stresses of chewing and biting. Therefore, the correct answer is temporary restorative materials + permanent restorative materials.

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  • 27. 

    Prognosis ក្នុងករណី រោគពុកធ្មេញដំណាក់កាលដំបូង (early caries) យើងអាចពន្យល់អ្នកជំងឺអោយជ្រើសរើស:

    • ការព្យាបាលដោយថែទាំ(preventive treatment plan)

    • ការប៉ះដោយ Amalgam

    • ការប៉ះដោយ Composite

    • ទាំងអស់ខាងលើ

    Correct Answer
    A. ការព្យាបាលដោយថែទាំ(preventive treatment plan)
    Explanation
    The correct answer is "ការព្យាបាលដោយថែទាំ(preventive treatment plan)". This is because early caries refers to the initial stages of tooth decay, where the enamel is beginning to break down but the cavity has not yet formed. Preventive treatment plans focus on strategies to stop the progression of caries and prevent further damage to the tooth. This can include measures such as regular dental cleanings, fluoride treatments, and dental sealants to protect the tooth from decay.

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  • 28. 

    RIGHT FRONT POSITION (7 O'CLOCK), working areas include:

    • ទាំងអស់ខាងលើ

    • MANDIBULAR ANTERIOR

    • MANDIBULAR POSTERIOR TEETH (RIGHT SIDE)

    • MAXILLARY ANTERIOR TEETH

    Correct Answer
    A. ទាំងអស់ខាងលើ
  • 29. 

    Components of the Dental Exam:

    • ទាំងអស់ខាងលើ

    • General History + Extra-oral Examination + Intra-oral Examination

    • Recording the Dental Examination + Tooth Diagrams and Color Coding

    • Diangosis + Treatment plan

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The components of the dental exam include general history, extra-oral examination, intra-oral examination, recording the dental examination, tooth diagrams and color coding, diagnosis, and treatment plan.

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  • 30. 

    វិធីដែលអាចControlling cariesលើអ្នកជំងឺស្ងួតមាត់គឺ:

    • ទាំងអស់ខាងលើ

    • អោយអ្នកជំងឺប្រើថ្នាំដុសធ្មេញមានfluoride ខ្ពស់(5000 ppm)

    • អោយអ្នកជំងឺប្រើ Fluoride mouth wash និង ប្រើ Fluoride varnish រៀងរាល់៣ខែ

    • សំរាប់អ្នកក្រោយព្យាបាលដោយកាំរស្មី អាចប្រើទឹកមាត់សម្បនិម្មិត (saliva substitute) ជាជំនួយ

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The explanation for the given answer is that controlling caries on all surfaces of the teeth can be achieved by using high fluoride toothpaste (5000 ppm), using fluoride mouthwash, and applying fluoride varnish every three months. Additionally, for individuals with reduced saliva flow, using a saliva substitute can be helpful.

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  • 31. 

    Enamel Hypoplasia the enamel:

    • Should be soft and thin

    • Should be hard

    • Should be strong

    • Should be hard and strong

    Correct Answer
    A. Should be soft and thin
    Explanation
    Enamel hypoplasia is a condition where the enamel, the outer layer of the tooth, is underdeveloped or thin. This can occur due to various factors such as malnutrition, illness, or trauma during tooth development. In this condition, the enamel lacks proper mineralization, making it softer and thinner than normal. This can result in increased susceptibility to dental decay and sensitivity. Therefore, the correct answer is that enamel hypoplasia should be soft and thin.

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  • 32. 

    Trauma to the mouth អាចបង្កអោយរបួស ខូចខាតដូចខាងក្រោម:

    • ទាំងអស់ខាងលើ

    • Crown Fracture , Crown-root fractures

    • Vertical/Horizontal Root Fracture

    • Luxation and Avulsion

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    Trauma to the mouth can result in various types of injuries. These can include crown fractures, crown-root fractures, vertical/horizontal root fractures, luxation, and avulsion.

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  • 33. 

    មូលហេតុដែលនាំអោយមាន Dental Trauma:

    • ទាំងអស់ខាងលើ

    • ដួលខ្លាំង និង របួសដោយសារកីឡាផ្សេងៗ ឬ កាយសម្ព័ន្ធ

    • វត្ថុរឹងបុកចំ និង ដាល់គ្នា

    • គ្រោះថ្នាក់ចរាចរណ៏ និង របួសនៅពេល epilepsy ធ្វើទុក្ខ

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    All of the above reasons can cause dental trauma. This means that any of the mentioned factors, including strong impact or force, accidents or falls, biting on hard objects, grinding or clenching of teeth, and seizures during epilepsy, can lead to dental trauma.

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  • 34. 

    Visual methods:

    • ទាំងអស់ខាងលើ

    • Detection of white spot

    • Discoloration

    • Magnification loupes

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The given answer "ទាំងអស់ខាងលើ" (All of the above) suggests that all the visual methods mentioned above can be used for the detection of white spots, discoloration, and magnification loupes. This means that each of these visual methods has the capability to identify white spots, discoloration, and can be used with magnification loupes.

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  • 35. 

    Diagnosis and Detection of Dental Carie:

    • ទាំងអស់ខាងលើ

    • Detectable explorer and Radiograph

    • Fiber Optic Transillumination

    • Visual and Laser caries detector

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The answer states that all of the above methods can be used for the diagnosis and detection of dental caries. This means that detectable explorer and radiograph, fiber optic transillumination, visual, and laser caries detector are all effective techniques for identifying and diagnosing dental caries.

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  • 36. 

    Operative dentistry to restores damaged and defective teeth in order to maintain:

    • Form, function and esthetic

    • Form and function

    • Form and esthetic

    • Function and esthetic

    Correct Answer
    A. Form, function and esthetic
    Explanation
    Operative dentistry is a branch of dentistry that focuses on restoring damaged and defective teeth. The goal of operative dentistry is to maintain the form, function, and esthetic appearance of the teeth. This means that the treatment not only aims to restore the natural shape and structure of the teeth, but also ensures that they function properly and look aesthetically pleasing. By addressing all these aspects, operative dentistry helps to improve the overall health and appearance of the patient's teeth.

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  • 37. 

    Dental Caries អាច remineralization ត្រឡប់មកធម្មតាវិញក្នុង:

    • ដំណាក់កាលដំបូង early decay និងមិនទាន់មានជាប្រហោង

    • ដំណាក់កាលដំបូង early decay និងមានជាប្រហោង

    • ដំណាក់កាល caries ដល់ dentin និងមានជាប្រហោង

    • ដំណាក់កាល caries ដល់ pulp

    Correct Answer
    A. ដំណាក់កាលដំបូង early decay និងមិនទាន់មានជាប្រហោង
    Explanation
    Dental caries can go through a process called remineralization, where the early decay that has not yet reached the dentin can be reversed. However, once the caries reaches the dentin, it becomes more severe and cannot be reversed. If the caries progresses further and reaches the pulp, it can cause more serious complications. Therefore, the correct answer is that remineralization can occur in the early stages of decay before it becomes severe.

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  • 38. 

    Microorganism ដែលសកម្មជាងគេ នៅក្នុងការបង្កើត អោយមាន dental caries គឺ :

    • Streptococcus mutan

    • Lactobacillus acidophilus

    • Lactobacillus salivarius

    • Streptococcus sobrinus

    Correct Answer
    A. Streptococcus mutan
    Explanation
    Streptococcus mutans is the correct answer because it is a type of bacteria commonly found in the mouth and is known to be a major contributor to the development of dental caries or tooth decay. It produces acids that can break down the tooth enamel, leading to cavities. Other microorganisms listed, such as Lactobacillus acidophilus, Lactobacillus salivarius, and Streptococcus sobrinus, may also be present in the mouth but are not as strongly associated with dental caries as Streptococcus mutans.

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  • 39. 

    Abrasion មូលហេតុបណ្តាល មកពី:

    • Hard tooth brushing (ដុសធ្មេញ ខ្លាំងពេក)

    • អាស៊ីតមកពី ក្រៅខ្លួន (ចំណីអាហារ)

    • អាស៊ីត ខាងក្នុង ខ្លួនគឺ Gastro-oesophageal reflux disease (GORD)

    • Occlusal tooth-tooth contact

    Correct Answer
    A. Hard tooth brushing (ដុសធ្មេញ ខ្លាំងពេក)
    Explanation
    Hard tooth brushing can cause abrasion. Abrasion refers to the wearing away of tooth structure due to mechanical forces. When a person brushes their teeth too forcefully or with a toothbrush that has hard bristles, it can lead to the wearing down of the enamel and dentin of the teeth. This can result in tooth sensitivity, tooth wear, and even tooth loss in severe cases. Therefore, hard tooth brushing is a potential cause of abrasion.

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  • 40. 

    Fluorosis caused by :

    • Excessive fluoride intake

    • Excessive phosphate intake

    • Excessive calcium intake

    • Excessive sugar intake

    Correct Answer
    A. Excessive fluoride intake
    Explanation
    Fluorosis is caused by excessive fluoride intake. Fluoride is a mineral that is commonly found in water and various foods. When consumed in excessive amounts, fluoride can accumulate in the body and cause a condition known as fluorosis. This condition primarily affects the teeth and bones, leading to dental problems such as discoloration, enamel erosion, and increased susceptibility to cavities. In severe cases, it can also cause skeletal deformities and joint pain. Therefore, it is important to maintain a balanced intake of fluoride to prevent the development of fluorosis.

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  • 41. 

    Tetracycline Stain caused by :

    • Broad spectrum of antibiotic especially Tetracycline

    • Broad spectrum of steroid

    • Broad spectrum of non steroid anti-inflammatory (NSAID)

    • Broad spectrum of Codeine

    Correct Answer
    A. Broad spectrum of antibiotic especially Tetracycline
    Explanation
    Tetracycline stain is caused by a broad spectrum of antibiotics, particularly Tetracycline. Tetracycline is known to cause discoloration of teeth when taken during tooth development, resulting in a yellow or grayish appearance. This stain is often permanent and difficult to remove. Therefore, the correct answer is "Broad spectrum of antibiotic especially Tetracycline."

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  • 42. 

    Dental caries microorganism នៅក្នុងក្រុមទាំងនោះមាន៧ គឺ :

    • ទាំងអស់ខាងលើ

    • Streptococcus mutan + Streptococcus sobrinus

    • Lactobacillus acidophilus + Lactobacillus oris

    • Lactobacillus salivarius + Actinomyces naeslundii + Actinomyces viscosus

    Correct Answer
    A. ទាំងអស់ខាងលើ
    Explanation
    The answer is "ទាំងអស់ខាងលើ" because it states that all of the mentioned microorganisms are present in the group of dental caries microorganisms.

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  • 43. 

    Toothwear អាចបណ្តាលមកពី :

    • ទាំងពីរខាងលើ

    • Physiological ដោយវិវត្តន៏យឺតៗ តាមធម្មជាតិទៅតាមអាយុកាលរបស់មនុស្ស

    • Pathological ដែលអាចបំផ្លាញផ្ទៃរបស់ធ្មេញលឿន

    • Bacteria

    Correct Answer
    A. ទាំងពីរខាងលើ
    Explanation
    Toothwear can occur from both physiological factors, which are natural wear and tear on the teeth that happens over time as a person ages, and pathological factors, which can cause rapid and excessive wear on the tooth surface. Bacteria can also contribute to toothwear by producing acids that erode the enamel. Therefore, toothwear can be caused by both physiological and pathological factors.

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  • 44. 

    នៅក្នុង Dental trauma, enamel-dentin fracture confined to enamel + dentin with loss of tooth structure but not :

    • Involving pulp

    • Involving enamel

    • Involving dentin

    • Involving root

    Correct Answer
    A. Involving pulp
    Explanation
    In dental trauma, an enamel-dentin fracture confined to enamel + dentin with loss of tooth structure means that the fracture only affects the outer layers of the tooth, specifically the enamel and dentin. It does not extend to the innermost layer, the pulp, which contains the nerves and blood vessels. Therefore, the fracture does not involve the pulp.

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  • 45. 

    Tetracycline Stain Caused by :

    • Broad spectrum of antibiotic esp. Tetracycline

    • Excessive fluoride

    • Excessive calcium

    • ទាំងអស់ខាងលើ

    Correct Answer
    A. Broad spectrum of antibiotic esp. Tetracycline
    Explanation
    Tetracycline stain is caused by the broad spectrum of antibiotics, especially tetracycline. Tetracycline is known to bind to the calcium in teeth, leading to the development of a yellow or brown discoloration. This stain can occur when tetracycline is taken during tooth development, which typically happens in childhood. The excessive fluoride and calcium options are not correct as they do not cause tetracycline stain.

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  • 46. 

    Which the following is not a treatment result in the restoration?:

    • Un-esthetics

    • Proper tooth form,

    • Function,

    • Esthetics

    Correct Answer
    A. Un-esthetics
    Explanation
    Un-esthetics is not a treatment result in the restoration because it refers to a lack of aesthetic appeal or beauty in the outcome of the treatment. The other options, proper tooth form, function, and esthetics, all refer to desirable outcomes in dental restoration. Proper tooth form ensures that the teeth are shaped correctly, function refers to the ability to chew and speak properly, and esthetics focuses on achieving a visually pleasing appearance.

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  • 47. 

    Which the following is not a treatment of dental caries?:

    • Extraction

    • Filling

    • Root canal filling

    • Crown

    Correct Answer
    A. Extraction
    Explanation
    Extraction is not a treatment for dental caries because it involves removing the entire tooth from the mouth. Dental caries, also known as tooth decay, is typically treated by removing the decayed portion of the tooth and filling the cavity with a dental filling. In more severe cases, a root canal filling may be necessary to remove the infected pulp from the tooth. A crown may also be used to restore the shape and function of a tooth that has been extensively damaged by dental caries. However, extraction is not a treatment option for dental caries as it involves removing the entire tooth, which is usually considered a last resort when all other treatment options have failed.

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  • 48. 

    Dentist most preferable sitting position is :

    • RIGHT REAR POSITION (11 O'CLOCK)

    • RIGHT FRONT POSITION (7 O'CLOCK)

    • RIGHT POSITION (9 O 'CLOCK)

    • DIRECT REAR POSITION (12 O'CLOCK)

    Correct Answer
    A. RIGHT REAR POSITION (11 O'CLOCK)
    Explanation
    The most preferable sitting position for a dentist is the right rear position (11 o'clock) because it allows the dentist to have a clear view of the patient's oral cavity and provides easy access for treatment. This position also allows the dentist to maintain good posture and reduces the risk of musculoskeletal disorders. Additionally, it enables effective communication with the dental assistant and provides a comfortable working environment.

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  • 49. 

    Dental trauma អាចប៉ះពាល់ដល់ :

    • ទាំងពីរខាងលើ

    • Dental tissue

    • Pulp

    • Only teeth

    Correct Answer
    A. ទាំងពីរខាងលើ
    Explanation
    The correct answer is "ទាំងពីរខាងលើ" (Both sides). This means that dental trauma can affect both the dental tissue and the pulp, not just one or the other. Dental trauma refers to any injury or damage to the teeth and surrounding structures, which can include fractures, dislocations, or injuries to the dental pulp. Therefore, it is important to consider both the dental tissue and pulp when assessing and treating dental trauma.

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Quiz Review Timeline (Updated): Mar 14, 2023 +

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  • Mar 14, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 26, 2018
    Quiz Created by
    Uhsmaster10
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