MCQs 7dd For Final Exam

The treatment of choice for a localized infection with pus is to establish drainage. This is because drainage helps to remove the pus and infected material from the affected area, allowing for proper healing. Antibiotic administration may also be necessary to help fight the infection, but drainage is the primary method to address the localized infection. Applying cold to the area and advising hot mouth washes are not appropriate treatments for a localized infection with pus.

Dextran is a type of polysaccharide that is produced by certain bacteria in dental plaque. It forms a sticky matrix that helps the plaque adhere to the teeth and other surfaces in the mouth. Bacteria, viruses, and dead cells are also present in dental plaque, but dextran is specifically responsible for its adhesiveness.

Both Azithromycin and Clarithromycin are classified as Macrolides 2nd generation, meaning they belong to the same class of antibiotics. This classification is based on their chemical structure and mechanism of action. Therefore, this statement is correct and provides a similarity between the two drugs.

The palatoglossal arch is the structure that separates the oral cavity from the oropharynx. It is located at the back of the oral cavity and forms a boundary between the two regions. The other options, such as the tonsil, soft palate, dorsum of the tongue, and palatopharyngeal arch, are not specifically related to the division between the oral cavity and the oropharynx.

The management of angina pectoris involves avoiding vasoconstrictors in local anesthesia (LA) as they can worsen the condition by further reducing blood flow to the heart. Aspiration is also important to prevent the vasoconstrictors from entering the bloodstream and causing systemic effects. Therefore, large amounts of vasoconstrictors in LA with particular importance of aspiration is incorrect.

The given description of the lesions as asymptomatic, bilateral, reticular, radiating, and grayish-white linear lesions in the buccal mucosa is consistent with lichen planus. Lichen planus is a chronic inflammatory condition that affects the skin and mucous membranes, including the buccal mucosa. It typically presents with reticular or lace-like white lesions, which may be linear or radiating in pattern. The lesions are usually asymptomatic and can be bilateral. Therefore, lichen planus is the most appropriate answer based on the given description.

All of the above answers are correct. Stomatitis can be caused by a variety of factors, including candida albicans infection, xerostomia (dry mouth), poor fitting dentures, and inadequate denture hygiene.

The hamular notch is a depression located between the maxillary tuberosity and the hamulus of the medial pterygoid plate.

The given correct answer, a blockage of Wharton's duct, is the most likely explanation for the intermittent painful swelling in the submandibular region. Wharton's duct is the main duct that carries saliva from the submandibular gland to the mouth. If this duct becomes blocked, it can cause a buildup of saliva and lead to painful swelling. The other options, such as ranula, Ludwig's angina, a blockage of Stensen's duct, and epidemic parotitis, do not specifically involve the submandibular gland or its ducts.

The correct answer is "ត្រឹម 6,8". This is because the initial pH of stomach acid is around 1.5 to 3.5, which is highly acidic. As food is digested and passes through the stomach, it is neutralized by bicarbonate ions from the pancreas, raising the pH to around 6.8 in the small intestine. Therefore, the pH of stomach acid at the beginning should be closer to 6.8.

The correct answer is "Cut by scissor." This suggests that the method to clean and remove the follicle in the cervical area of the tooth is by cutting it with scissors. This implies that a physical removal is required, rather than peeling off or wiping with gauze. Additionally, the use of Sodium Hypochloride is not mentioned as a cleaning method in this context.

The maillary lateral incisor is the anterior tooth with the greatest variability in size and shape. This means that among the options given, the maillary lateral incisor is the tooth that can vary the most in terms of its size and shape compared to the other teeth mentioned (mandibular canine, maillary canine, maillary central incisor, and mandibular central incisor).

Keeping a light occlusion on the distal extensions is the best selection for preventing abutment teeth of class I Kennedy from the negative effects of additional load. This means that the pressure and force applied to the teeth in the back of the mouth should be minimized. This can be achieved by ensuring that the occlusion, or the way the upper and lower teeth come together, is not too heavy on the distal extensions. By reducing the force on these teeth, the risk of damage or complications due to the additional load is decreased.

The correct answer is "គ្រលៀន". Barbiturates are a class of drugs that act as central nervous system depressants. They are commonly used as sedatives, hypnotics, and anticonvulsants. The word "គ្រលៀន" in Khmer translates to "sedative" in English, which accurately describes the action of barbiturates.

A keloid is the excessive formation of scar tissue beyond the wound margin. It is characterized by a raised, thickened, and often shiny appearance. Keloids can occur after any type of skin injury, such as surgery, burns, or even minor cuts. They are more common in individuals with darker skin tones and may cause itching, pain, or discomfort. Treatment options for keloids include corticosteroid injections, silicone gel or sheeting, cryotherapy, laser therapy, or surgical removal.

During an infection, the body's immune response triggers the release of various chemicals, including hydrogen ions. These hydrogen ions contribute to the acidity of the area, resulting in a decrease in pH. This low pH environment is unfavorable for many pathogens, as it can inhibit their growth and survival. Therefore, the tissue pH at the infection site becomes low.

The correct answer is to observe the case until the eruption of maillary permanent lateral incisors and canines. This is because the labial frenum is causing a diastema (gap) between the maxillary permanent central incisors, but the lateral incisors and canines have not yet erupted. It is important to wait until these teeth have erupted before deciding on the appropriate treatment, as they may help to close the gap naturally. Therefore, observing the case until the eruption of these teeth is the most appropriate course of action.

When designing palatal connectors, relief should be given for the palatal torus. Palatal torus refers to a bony prominence on the palate, which can vary in size and shape among individuals. Providing relief for the palatal torus ensures that the connector does not impinge on this anatomical structure, allowing for a more comfortable and secure fit of the dental appliance. By accommodating the palatal torus, the palatal connector can distribute forces evenly and prevent any discomfort or pressure on the torus during functional movements of the mouth.

Thyroxin is a hormone produced by the thyroid gland that plays a crucial role in regulating the body's metabolism. It increases the metabolic rate, which leads to an increase in energy production and utilization. This increase in energy can result in heightened alertness, increased heart rate, and improved overall physical performance. Therefore, the release of thyroxin can lead to an increase in the body's efficiency and effectiveness, hence enhancing its overall performance and functionality.

Leukopenia is the correct answer because it refers to a low white blood cell count. Leukocytosis, on the other hand, refers to a high white blood cell count. Thrombocythemia and thrombocytopenia are related to platelet counts, not white blood cell counts. Anemia, meanwhile, is a condition characterized by a low red blood cell count or low hemoglobin levels, not white blood cells.

The term 'carcinoma in situ' refers to a condition where the abnormal cells are confined within the epithelium, meaning they have not invaded deeper tissues or spread to other parts of the body. Dysplasia is a term used to describe abnormal cellular changes, such as changes in size, shape, and organization, which are often seen in pre-cancerous or early cancerous lesions. Therefore, the correct answer is dysplasia of cells confined within the epithelium.

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The patient is a 10-year-old who experienced pain on biting down on hard food. The tooth in question has a large mesio-occlusal cavity and shows signs of pulp inflammation. The correct answer, traumatic occlusion, refers to the condition where the tooth is subjected to excessive forces during occlusion, leading to pulp inflammation and pain. This is consistent with the patient's symptoms and the observed clinical findings.

The most clear differentiation between an acute periodontal abscess and an acute periapical abscess would be the response to a test for vitality. In an acute periodontal abscess, the tooth is vital and will respond to the test for vitality, whereas in an acute periapical abscess, the tooth is non-vital and will not respond to the test. This test helps to determine the source and location of the abscess.

The correct answer is (4) ត្រឹមត្រូវ. The use of pins in the placement of amalgam increases the retention of the material, which helps prevent dislodgement and improves the overall durability of the restoration. This is especially important in areas such as the occlusal surface of the tooth (1) where there is a lot of chewing force, (2) areas where there is a need to provide additional support to the weakened tooth structure, and (3) areas where it is important to achieve proper alignment and stability. Therefore, the use of pins in these situations is appropriate and necessary.

To make a diagnosis of an odontogenic keratocyst, a histologic examination is necessary. This involves analyzing a tissue sample under a microscope to identify the characteristic features of the cyst. Aspiration, exfoliative cytology, and radiographic examination may provide additional information, but they are not sufficient on their own to confirm the diagnosis of an odontogenic keratocyst.

A primordial cyst is a developmental cyst that forms in the place where a tooth should have developed but did not. It is not directly associated with an impacted tooth because it occurs before the tooth even begins to form. In contrast, adeno-ameloblastoma, odontogenic myxoma, Pindborg's tumor, and ameloblastoma are all types of tumors that can be associated with an impacted tooth.

Z-plasty is a surgical technique used to reposition or lengthen scars. It involves creating two triangular flaps of skin with a central limb, resembling the letter "Z". This technique is commonly used to improve the functional and cosmetic outcomes of scars, particularly in areas of tension. The triangular flaps are designed to redirect tension away from the scar, resulting in a more inconspicuous and flexible scar. Therefore, the correct answer is Z-plasty.

The correct answer is (1) and (3) are correct. This is because overjet refers to the horizontal distance between the upper and lower incisors, and overbite refers to the vertical overlap of the upper and lower incisors. Both of these factors can contribute to the severity of crowding in Class I and Class II cases.

The patient's symptoms of vesicles on the vermillion border of the upper lip, preceded by itching and occurring multiple times a year, are consistent with recurrent herpes simplex infection. Herpes zoster typically presents as a painful rash in a dermatomal distribution, while primary herpetic stomatitis usually occurs in children and presents with widespread oral ulcers. Recurrent aphthous ulceration typically presents as shallow, painful ulcers in the oral cavity. Therefore, recurrent herpes simplex infection is the most likely diagnosis based on the patient's symptoms.

Cavity varnish is used in the placement of amalgam to provide several benefits. It helps to seal the dentinal tubules, preventing sensitivity and leakage of fluids. It also aids in the adaptation of the amalgam to the cavity walls, ensuring a better marginal seal. Additionally, cavity varnish promotes the formation of secondary dentin, which helps protect the pulp. Lastly, it acts as a barrier, preventing the discoloration of the tooth structure caused by the components of the amalgam. Therefore, options (2) and (4) are correct as they accurately describe the benefits of using cavity varnish in amalgam placement.

Papillary hyperplasia on the palate is a condition characterized by the overgrowth of the tissue on the palate. This condition is commonly associated with wearing an ill-fitting denture and poor oral hygiene. An ill-fitting denture can cause trauma and irritation to the tissues, leading to hyperplasia. Poor oral hygiene can also contribute to the development of this condition as it allows for the accumulation of plaque and bacteria, further irritating the tissues. Heavy smoking and an allergy to acrylic resin are not typically associated with papillary hyperplasia. Occlusion with posterior natural teeth is also not a common cause of this condition.

The history of the oral lesion would be of greatest value in determining the etiology of an oral ulceration. By gathering information about the patient's medical history, including any recent trauma, infections, or medication use, it can help identify potential causes of the ulceration. Additionally, the history can provide insights into the duration, progression, and associated symptoms of the lesion, which can aid in making a diagnosis.

A fraenectomy is a surgical procedure that involves the removal or modification of the fraenum, a small fold of tissue that connects the lips, tongue, or cheeks to the underlying structures. It is commonly performed to correct issues such as a short or tight fraenum that restricts movement or causes dental problems. In this case, the correct answer is Fraenectomy, as it refers to the general surgical procedure of removing or modifying the fraenum.

The premature loss of deciduous second molars can lead to the permanent first molars being displaced and erupting in a more forward position. This can cause a lack of space for the first premolars and the lingual eruption of the second premolars, resulting in them being displaced and erupting in an abnormal position. Therefore, the premature loss of deciduous second molars is the most likely explanation for the observed dental arch pattern.

The most likely diagnosis for a painless, bluish lump just inside the vermillion border of the lower lip is a mucocoele. Mucocoeles are commonly caused by trauma to the minor salivary glands, leading to the accumulation of saliva in a cyst-like structure. They often present as bluish or transparent swellings and are typically painless. Smokers' keratosis, squamous cell carcinoma, fibroma, and fibro-epithelial polyp are less likely diagnoses in this case.

Dysplastic lesions of squamous epithelium are most commonly found on the buccal mucosa.

Given the patient's symptoms of widespread, sore, red, and white oral mucosal lesions, the most likely diagnosis is candidiasis. Candidiasis is a fungal infection caused by the overgrowth of Candida species, commonly Candida albicans, in the oral cavity. It often occurs in patients who have been on broad-spectrum antibiotics for an extended period, as antibiotics can disrupt the normal balance of microorganisms in the mouth, allowing Candida to flourish. The characteristic appearance of red and white lesions is known as pseudomembranous candidiasis or thrush.

The patient's symptoms of malaise, fever, and cervical lymphadenopathy, along with abnormal blood examination findings of low hemoglobin, low platelets, low red blood cell count, and low white blood cell count, are consistent with acute myelogenous leukemia. This is a type of cancer that affects the bone marrow and causes abnormal production of myeloid cells, leading to a decrease in normal blood cell counts. Acute necrotizing ulcerative gingivitis typically presents with severe gingival pain, foul odor, and ulceration, but does not typically cause systemic symptoms or abnormal blood counts. Thrombocytopenic purpura and infectious mononucleosis may cause low platelets and abnormal blood counts, but do not typically cause the other symptoms described in the patient.

The correct answer is 3 levels: Level A, B, C. This means that there are three levels of precaution when using antibiotics, namely Level A, Level B, and Level C. It suggests that there are different levels of caution and guidelines that need to be followed while using antibiotics to ensure their proper and effective use.

Thumbsucking is a common behavior in young children, but it is usually discontinued before the age of four. This means that most children naturally stop thumbsucking on their own before they reach four years old. Therefore, the correct answer is that thumbsucking is discontinued before four years of age.

The earliest apical radiographic change seen in a pulpally involved tooth is widening of the periodontal ligament space. This can indicate inflammation and increased blood flow in the area, which is a response to the infection or injury in the pulp. Resorption of bone, loss of lamina dura, and external root resorption may occur later as the infection progresses and the inflammatory process continues. However, the initial change that can be observed on a radiograph is the widening of the periodontal ligament space.

The correct answer is (1), (2), and (4). This is because all three types of tumors mentioned - mixed tumor, adenocarcinoma, and mucoepidermoid tumor - can occur in the Parotid salivary gland. Warthin's tumor, on the other hand, typically occurs in the submandibular salivary gland rather than the Parotid gland.

A ranula is a type of mucous retention phenomenon. It occurs when the ducts of the sublingual or submandibular salivary glands become blocked, causing the mucus to accumulate and form a cyst-like swelling. This condition is characterized by a painless, translucent, bluish swelling in the floor of the mouth. It is typically caused by trauma, infection, or obstruction of the salivary ducts. Treatment usually involves surgical removal of the cyst.

Hyperplastic lingual tonsils may resemble median rhomboid glossitis.

Clindamycin belongs to the group of macrolide antibiotics. Macrolides are a class of antibiotics that inhibit bacterial protein synthesis by binding to the 50S ribosomal subunit. They are effective against a wide range of gram-positive bacteria, some gram-negative bacteria, and atypical pathogens. Clindamycin specifically is commonly used to treat infections caused by anaerobic bacteria and certain types of gram-positive bacteria. It is not a penicillin or a fluoroquinolone, and septicemia is a condition characterized by the presence of bacteria in the bloodstream, not a group of antibiotics.

The most likely explanation for the correct answer, "inequity between tooth size and supporting bone," is that this condition refers to a Class I malocclusion. In a Class I malocclusion, there is a discrepancy between the size of the teeth and the size of the supporting bone. This can lead to misalignment of the teeth and an improper bite. It is important to note that the other options listed, such as discoordinate growth of the dental arch, insufficient tooth size, maillary incisor crowding, and congenitally missing teeth, may also contribute to malocclusion but are not the primary cause in a Class I malocclusion.

Carbamazepine (Tegretol) is the drug most commonly used to treat trigeminal neuralgia. Trigeminal neuralgia is a condition characterized by severe facial pain, often triggered by normal activities such as eating or speaking. Carbamazepine is an anticonvulsant medication that helps to reduce the abnormal electrical activity in the nerves responsible for the pain. It is considered the first-line treatment for trigeminal neuralgia due to its effectiveness in relieving pain and its relatively low side effect profile compared to other medications. Diazepam, ergotamine, and phenytoin are not typically used for treating trigeminal neuralgia.

Metastatic carcinoma refers to cancer that has spread from its original site to other parts of the body. In this case, the source of the metastatic carcinoma is not specified, but it is indicated that the lesion originated from the nasopharynx or prostate. Therefore, the correct answer is (4) ត្រឹមត្រូវ, as both options (1) and (3) are mentioned as possible sources of the lesion. Option (2) is not mentioned as a possible source, and therefore is not correct.

Dentigerous cysts are usually found pericoronally, meaning they are located around the crown of an impacted tooth. This type of cyst forms when the crown of a tooth becomes trapped within the surrounding tissue, causing fluid to accumulate and form a cystic sac. Pericoronal cysts are commonly associated with impacted third molars, also known as wisdom teeth, which often do not fully erupt and remain partially or completely covered by gum tissue. Therefore, the correct answer is pericoronally.

Cyclosporine is known to cause fibrous gingival hyperplasia in some patients. This condition is characterized by an overgrowth of fibrous tissue in the gums, resulting in enlarged and swollen gums. It can lead to aesthetic concerns and difficulties in maintaining oral hygiene. Regular dental care and monitoring are necessary for patients taking cyclosporine to manage this side effect.

A mycotic aneurysm is a complication that occurs when a bacterial infection spreads through the bloodstream and affects the arterial wall. This can weaken the wall and cause it to bulge, forming an aneurysm. It is called "mycotic" because it is often caused by a fungal infection, although bacterial infections can also be responsible. This condition is a serious medical concern as it can lead to rupture of the aneurysm and potentially life-threatening complications.

The correct answer is (1) and (3). This is because a larger diameter condenser and decreased condensing pressure are both important factors for efficient and effective cooling in the daily use of spherical admi alloy for soldering. An anatomical wedge and a dead soft matri band are not relevant to the process of soldering and cooling.

An injection at the anterior border of the ramus of the mandible, a centimetre above the lower occlusal plane, will anaesthetise the long buccal nerve.

The correct answer is (1), (2), and (3) are all correct. This is because the question is asking for the factors that can cause the pulp chamber and root canals to be smaller. Option (1) states that age can cause the pulp chamber and root canals to become smaller. Option (2) states that chronic trauma can also cause this. Option (3) states that dentinal dysplasia can cause the same effect. Therefore, all three options are correct explanations for the given statement.

Hairy leukoplakia is a condition characterized by white, hairy-like patches on the tongue, caused by the Epstein-Barr virus (EBV). EBV is a common virus that infects most people at some point in their lives and is associated with various diseases, including infectious mononucleosis. While other viruses listed, such as Papilloma, Herpes simplex, and Human immunodeficiency virus (HIV), can cause oral lesions, they are not specifically associated with hairy leukoplakia.

The given information states that a 3mm radiolucent lesion is present in the apical region of the mandibular second premolar. However, the tooth responds normally to vitality tests. Based on this information, it is unlikely to be a periapical granuloma, periapical cyst, or chronic periapical abscess, as these conditions would typically cause pain or discomfort and would result in abnormal vitality test results. The most likely explanation is that the radiolucent lesion is located near the mental foramen, which is a normal anatomical structure in the mandible.

Bactericidal antibiotics are a type of antibiotic that directly kill bacteria. Unlike bacteriostatic antibiotics, which only inhibit the growth and reproduction of bacteria, bactericidal antibiotics actively destroy the bacteria, leading to their death. This is achieved by targeting specific components or processes within the bacterial cells, such as cell wall synthesis or protein synthesis, causing irreparable damage and ultimately killing the bacteria. Bactericidal antibiotics are often preferred in severe or life-threatening infections, where rapid elimination of the bacteria is crucial for the patient's recovery.

The correct answer is (2) and (4). Ulceration and spontaneous bleeding are potential side effects of chemotherapy on the oral mucosa.

The correct answer is (2) and (4) because the statement in option (2) states that the device detects oscillations, which implies that it can detect vibrations or movements. Option (4) states that the device can measure pocket depths using a periodontal probe, which is a tool used to measure the depth of the space between the gum and tooth. Both of these options indicate that the device can detect and measure certain characteristics or conditions.

Xerostomia, or dry mouth, is a condition that reduces saliva production. Saliva plays a crucial role in maintaining oral health by washing away food particles and neutralizing acids produced by bacteria, which helps prevent tooth decay. When there is a lack of saliva, the mouth becomes dry, making it easier for bacteria to thrive and causing an increased risk of developing caries, or cavities. Therefore, xerostomia predisposes individuals to caries.

Physiologic (racial) pigmentation refers to the natural pigmentation of the skin that varies among different races. Melanoma, on the other hand, is a type of skin cancer that arises from the melanocytes, the cells responsible for producing melanin. Melanoma differs from physiologic pigmentation because it contains melanin. While both may involve pigmentation, melanoma is a pathological condition characterized by the presence of abnormal melanocytes and can be potentially life-threatening.

To achieve good aesthetics and a porcelain-like appearance in a metal crown, it is necessary to have specific margins and characteristics. The shoulder margin should be 0.8-1.2 mm in width and have a shoulder shape. The crown should have an all-in-one (AIO) gingival bevel that is smooth and continuous. The Cavo surface should have a 90-100 degree angle. Additionally, there should be a cervical limit below the gingival margin of 2mm. Therefore, options (1), (2), and (3) are all correct and aligned with the given requirements.

The correct answer is (2) and (4) are both correct. Adding fluoride is necessary for a child with active caries living in an area where the drinking water contains less than 0.7 ppm of fluoride (option 2). It is also necessary for a 1-year-old toddler living in a non-fluoridated community (option 4). Both cases require the addition of fluoride to prevent tooth decay and promote dental health.

Glass ionomer cement chemically bonds to the tooth. This type of cement contains a combination of glass powder and an organic acid. When it is applied to the tooth, the acid reacts with the minerals in the tooth structure, creating a strong chemical bond. This bond helps to seal the tooth and prevent bacteria from entering, reducing the risk of further decay. Composite resin, dental sealants, and amalgam do not chemically bond to the tooth in the same way as glass ionomer cement.

The correct answer is "វះកាត់ចោល (Resection)". This is the most common and effective treatment for ameloblastoma, which is a type of benign tumor that affects the jaw. Resection involves surgically removing the tumor and a portion of the surrounding healthy tissue to ensure complete removal and prevent recurrence. Other treatment options such as chemotherapy, enucleation, and radiation therapy may be used in certain cases, but resection is generally considered the primary treatment approach.

Necrotizing ulcerative gingivitis mainly affects the gingival papillae. This condition is characterized by the rapid destruction of gum tissue, leading to painful ulcers and necrosis. The gingival papillae are the triangular-shaped gum tissue located between the teeth. They are particularly susceptible to this condition due to their close proximity to dental plaque and bacteria, which can cause an inflammatory response and tissue damage.

Canines are responsible for tearing food because they have long, sharp, and pointed edges that are designed to grip and tear into food. They are particularly effective in tearing meat and other tough substances. Molars, on the other hand, are responsible for grinding and chewing food. Central incisors and premolars also play a role in biting and chewing, but they are not specifically designed for tearing.

Zinc phosphate cement can be used as a luting agent because it has the ability to bond to both enamel and dentin surfaces. It forms a strong and durable bond, making it suitable for cementing restorations such as crowns and bridges. Additionally, zinc phosphate cement has good biocompatibility and is resistant to dissolution in oral fluids. Therefore, it is an effective choice for luting agents in dental applications.

The correct answer is (1) and (3) because ordering a chest X-ray and maintaining space with a removable appliance are appropriate steps to take when a 7-year-old child loses a primary tooth due to trauma. A chest X-ray is necessary to rule out any aspiration or ingestion of the tooth, while a removable appliance helps to maintain the space for the permanent tooth to erupt properly.

Compomer restorative materials are resin systems that contain fluoride-containing glasses. These materials are a combination of composite resin and glass ionomer, providing the benefits of both materials. The resin system allows for better esthetics and strength, while the fluoride-containing glasses help to release fluoride ions, providing additional protection against tooth decay. Compomers are commonly used in dental restorations to provide a durable and aesthetically pleasing solution.

The correct answer is (4) because amalgam is a high-strength dental material that is commonly used for fillings. It is durable and can withstand the pressure of chewing for a long time.

Edema refers to the swelling caused by an abnormal accumulation of fluid in the body's tissues. This can occur due to various reasons such as inflammation, injury, or underlying medical conditions like heart failure or kidney disease. When there is an increase in tissue fluid, it leads to the swelling known as edema. Thrombosis, hematoma, embolism, and surgical emphysema are unrelated to the accumulation of tissue fluid and do not cause swelling.

Maxillary premolars typically have two roots, with one root positioned buccally (towards the cheek) and the other root placed lingually (towards the tongue). This placement of roots allows for stability and support of the tooth within the dental arch.

The correct answer is "Lateral parapharyngeal". Trismus refers to the condition of having difficulty in opening the mouth due to muscle spasm. The lateral parapharyngeal region is located on the side of the pharynx, near the jaw joint. In cases of trismus, the muscles in this region may become affected, leading to limited mouth opening. The other options, such as submandibular, sublingual, deep temporal, and submasseteric, are not directly related to trismus.

Gingivectomy is a surgical procedure performed to remove excess gum tissue and reshape the gums. It is commonly done to eliminate suprabony pockets, which are pockets of gum tissue that extend above the level of the underlying bone. This procedure helps to reduce the depth of the pockets and improve oral hygiene. The other options listed, such as osseous craters, infrabony pockets, root hypersensitivity, and inadequate attached gingiva, are not directly related to the purpose of gingivectomy.

The correct answer is Gingival marginal trimmer. This tool is specifically designed to remove loose enamel rods at the gingival floor of a class II amalgam cavity. It has a curved blade that allows for precise and controlled trimming of the enamel. The other options, such as the straight chisel, hatchet, and gingival curette, are not suitable for this purpose and may cause damage to the surrounding tooth structure.

Acute herpetic gingivostomatitis is a contagious condition caused by the herpes simplex virus. It is characterized by painful sores and blisters in the mouth and on the gums. The virus can be easily transmitted through direct contact with the sores or through saliva. Pemphigus, recurrent aphthous stomatitis, and acute necrotizing ulcerative gingivitis are not contagious conditions.

The correct answer is "Anterior teeth crown a longer than the maxillary premolar crown." This means that the crowns of the anterior teeth are longer in size compared to the crown of the maxillary premolar. This characteristic can be used to differentiate the maxillary first premolar from the other anterior teeth.

The patient is experiencing an anaphylactic reaction, as evidenced by the symptoms of difficulty breathing, swelling, and hives. The first step in managing anaphylaxis is to ensure the patient's airway is open and provide them with supplemental oxygen. Administering 100% oxygen will help improve the patient's oxygenation and alleviate their respiratory distress. This is the most immediate and essential intervention to ensure the patient's survival.

The correct answer is (1) , (2) និង (3) ត្រឹមត្រូវ. This is because tooth mobility, gingival sulcus depth, and signs of gingival inflammation are all important factors to consider when assessing the periodontal health of a patient. These indicators can help determine the severity of the disease and guide appropriate treatment planning. Oral hygiene status, although important, may not directly indicate the presence or severity of periodontal disease.

The removal of undermined enamel in a Class II cavity is done using a chisel. A chisel is a dental instrument with a sharp, flat blade that is used to remove decayed or undermined enamel and dentin. It is commonly used in restorative dentistry procedures to prepare the tooth for filling or restoration. The chisel's sharp edge allows for precise and controlled removal of the undermined enamel, ensuring that the tooth is properly cleaned and prepared for further treatment.

The presence of pulp chamber abnormalities in primary maxillary incisors can be caused by trauma. Trauma to the tooth can lead to damage or inflammation of the pulp chamber, resulting in abnormalities. Amelogenesis imperfecta, hypophosphatasia, ectodermal dysplasia, and cleidocranial dysostosis are conditions that can affect tooth development and structure, but they are not directly related to trauma.

Sublingual keratosis is a condition characterized by thickening and white patches on the mucous membranes beneath the tongue. It is considered a potentially premalignant lesion, meaning that it has a high rate of transforming into cancer. Therefore, individuals with sublingual keratosis should be closely monitored and undergo regular check-ups to detect any signs of malignant transformation. This is important in order to provide early intervention and prevent the progression to oral cancer.