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KROK 2 Dentistry 2021 Questions | KROKEXAM
Browse 2021 KROK 2 Dentistry exam questions with answers and explanations.
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A 21-year-old woman complains of short-term pain attacks in her lower left tooth that are provoked by thermal stimuli and quickly stop after the stimulus is removed. On the masticatory surface of tooth 47, examination reveals a carious cavity with a narrow entrance that is filled with light softened dentin. Probing of the cavity floor and percussion of tooth 47 are painless. Probing of the cavity walls is painful. Make the diagnosis:
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A 37-year-old man was prescribed an extraction of tooth 25 under a local anesthesia. Where should the doctor be positioned in relation to the patient during the extraction of tooth 25?
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When fitting the metallic frame of a porcelain-fused-to-metal dental bridge, it was determined that in the central occlusion the frame is in a contact with the antagonist teeth. It reaches the ledges of the abutment teeth and is 0.3 mm thick. What tactics should a dentist choose?
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X-ray of the lower jaw of a 14-year old boy shows a round homogeneous lucency with clear margins. This neoplasm is located within the body of the mandible in the area of tooth 36 that was extracted 7 months ago. A puncture of the neoplasm yielded a yellowish liquid with cholesterol crystals. Make the provisional diagnosis:
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Removable complete dentures are being made for a 70-year-old man with completely edentulous jaws and marked progenia. What artificial teeth are not placed in such dentures?
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A clasp (bugel) denture with clammer fixation is being made for a partially man. edentulous (Kennedy class I) Impressions were obtained, casts were made, and the centric relation of the jaws was determined and fixed. What laboratory stage of the denture-making is the next one?
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45-year-old woman complains of bleeding gums. The bleeding occurs when she brushes her teeth or eats hard food. Objectively, in the frontal area of her lower jaw the gums are hyperemic, edematous, and bleed when palpated. In the other areas, her oral mucosa is normal. The woman has a deep bite. Her teeth are stable, except for teeth 41 and 31 (the I degree of mobility). X-ray shows resorption of the interalveolar septa in the area of teeth 41, 42, 31, and 32 to 1/3 of the root length. What is the most likely diagnosis?
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A regular check-up has detected crowded teeth on the front lower jaw of a 15-year-old boy. The gums in this area are slightly edematous and hyperemic with a cyanotic tint. The gingival margin has a torusal thickening. Dental calculus is observed on the teeth. The Schiller Pisarev test is positive. X-ray shows that in the front lower jaw the contours of the cortical plate are fuzzy on the apices of the interdental septa, though the cortical plate itself is intact. Make the diagnosis:
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A 45-year-old man complains of painful and loose front teeth on his lower jaw. Objectively, teeth 41, 42, 31, and 32 have the III degree of mobility. Plans are made to remove these teeth and make a direct denture for this man. When should a direct denture be installed after the teeth extraction?
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An 11-year-old child has a thickening in the frontal region of the lower jaw that appeared after the child fell down. The trauma occurred one month ago. Objectively, on the lower jaw, in the area of the mucogingival junction, there is a circumscribed dense spot with smooth surface that is slightly painful on palpation. The teeth in the pathologic focus are intact and vital. X-ray detects an osteoporotic focus with thickened periosteum in the frontal region of the lower jaw. What is the most likely diagnosis in this case?
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A patient needs a removable full laminar denture for the upper jaw. Objectively, on the mucosa of the denture bed there are numerous dense papillomas of varying size. What tactics should the dentist choose?
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A 48-year-old man came to a clinic for oral cavity sanation. He has a history of mild diabetes mellitus. Objective examination reveals whitish papulae against the background of normal buccal mucosa. The papulae are slightly raised above the mucosa. They are located symmetrically, predominantly in the olar space, and form a lace-like pattern. On the upper jaw there are two soldered dental bridges, tooth 37 has an amalgam filling, tooth 36 is covered with a cast metal crown. What is the most likely diagnosis?
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During or immediately after an injection, certain local complications can develop. What is not one of those complications?
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A 35-year-old man complains of missing teeth on his lower jaw. Objectively, teeth 36, 37, and, 38 are missing. Teeth 34 and 35 are intact. What type of dentition restoration would be optimal in this case?
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A 35-year-old man has an open unilateral non-dispalced fracture of the mandibular body on the left. The fracture line passes between the missing teeth 33 and 34. The fragments need to be immobilized. What splint would be the most advisable for this purpose?
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A regular check-up of a 7-year-old girl detected chalk-like spots on the vestibular surface of her teeth 11 and 21. The surface of the spots is matt, smooth when probed, and can be stained with methylene blue. What treatment method would be rational in this case?
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The parents of a 6-year-old child complain that their child for the last three days had body temperature of 39°C, weakness, loss of appetite, and pain during swallowing. Objectively, the mucosa of the tonsils, palatine arches, retromolar space, and posterior and lateral pharyngeal walls is swollen and has a dirty-gray coating that is tightly attached to the underlying tissues. The coating is very difficult to remove. When removed, it exposes a bleeding surface. The submandibular lymph nodes are enlarged and painful. What is the most likely provisional diagnosis?
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After examination, an 8-year-old child was diagnosed with torsiversion of the lateral maxillary incisors and an arch length deficiency caused by macrodontia. To prevent the vestibular position of the canines, a Hotz serial extraction was performed. In what order were the teeth removed in this case?
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A 63-year-old woman has an oval neoplasm on the lateral surface of her neck. The neoplasm has a smooth surface and is approximately 3 cm in size. On palpation it is soft and dough-like, mobile, and painless. What is the most likely diagnosis in this case?
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A 16-year-old girl came to a dentist complaining of darkened crowns of her teeth 11 and 12. According to the girl, about one year ago she had a sports trauma. Objectively, the crowns of teeth 11 and 12 are dark gray, intact, painless on percussion. The mucosa of the alveolar process is unchanged. X-ray shows round areas of bone tissue destruction in the region of the root apices of teeth 11 and 12. These bone lesions are 0.3-0.4 cm in diameter and have clear margins. What tactics would you choose?
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A 42-year-old man complains of problems with chewing. Objectively, his tooth 26 is missing. On the medial surface of tooth 27 and distal surface of tooth 25 there are class II carious cavities according to Black's classification.It is recommended to make a full-cast dental bridge with 27 and 25 as the abutment teeth. What material is used to assess whether the dental bridge framework tightly adheres to the abutment teeth?
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A 26-year-old woman, who works with chemical substances at a factory, came to a dentist with complaints of teeth discoloration and extreme sensitivity to cold, sweet, and sour foods in her upper front teeth. Objectively, on the vestibular surface of teeth 13, 12, 11, 21, 22, and 23, at their equator, there are white spots that spread to the cutting edges. Probing detects rough and fragile enamel in the affected areas. Vital staining is positive. Make the clinical diagnosis:
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A 60-year-old man came to a dentist two days after the fixation of a removable partial denture. He complains of an ulcer that appeared on his oral mucosa. What has caused the mucosal lesion near the edge of the denture base?
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A 35-year-old man undergoes treatment for chronic fibrous pulpitis of tooth 25. The canal is to be filled using the warm gutta-percha vertical condensation technique. What instrument is needed for gutta-percha condensation?
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On the second day after the fixation of partial laminar dentures, a man developed complaints of a burning sensation and an unpleasant taste in his mouth, when using the dentures. Examination revealed hyperemic mucosa and hypersalivation. Prior to making new dentures, he was using the old ones for 5 years and had no such complaints. What is the likely cause of this phenomenon?
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A 25-year-old man complains of a dull pain in the area of his lower right second molar. This tooth was treated for pulpitis one day ago. The carious cavity has a temporary filling. Objectively, X ray of tooth 47 shows a perforation in the area of root bifurcation within the bone tissue. The root canals are filled and there are no pathologic changes in the periapical tissues. The depth of dentogingival probing in the bifurcation area is normal. What treatment method would be optimal in this case?
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A 28-year-old woman came to a dentist with complaints of a cavity in her upper right tooth. Objectively, on the masticatory surface of tooth 16 there is a carious cavity with a wide opening. The cavity is located within the parapulpar dentin and filled with dense pigmented dentin. The carious cavity does not communicate with the dental cavity. Probing of the carious cavity walls and floor, cold stimulus, and percussion cause no pain. Electric pulp testing-12 microamperes. What is the most likely diagnosis?
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A 28-year-old man came to a dentist for the purpose of sanation. Objectively, on the masticatory surface of tooth 47 there is a deep carious cavity that communicates with the dental cavity. Probing of the cavity is painless, the tooth is non-responsive to thermal stimuli, its percussion is painless. Electric pulp testing -108 microamperes. X-ray shows traces of filling material in the root canals of tooth 47, the periodontal fissure is widened and deformed in the apical region. Make the diagnosis:
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A 2-year-old child is being treated for severe acute herpetic stomatitis. Currently, it is the period of disease decline. What medicines for topical application to the oral mucosa should be added specifically at this stage to the complex of medicines being taken?
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A 48-year-old man came to a dental surgeon for extraction of the roots of tooth 37. What instrument must be used for this procedure?
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An 18-year-old young man complains of a cavity in his tooth 37 and pain that occurs when food gets into this cavity. The tooth was painful one year ago but he did not make an appointment with the doctor back then. Objectively, on the masticatory surface of tooth 37 there is a deep carious cavity that communicates with the pulp chamber. Overgrown granulation tissue protrudes from the perforation into the pulp chamber and fills practically the whole carious cavity. Probing of the granulations provokes bleeding and slight pain. Percussion is painless. Mucosa in the projection of the roots of tooth 37 is pale pink and has no pathologic changes. Electric pulp testing-60 microamperes. What is the most likely diagnosis?
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A 28-year-old man has received a trauma of the mental region. X-ray shows a bilateral mental fracture of the lower jaw. In what direction will the displacement of the lesser fragment occur?
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A 54-year-old man developed a pustule on the skin of his chin. The pustule rapidly progressed into a hard and sharply painful infiltration 3x3.5 cm in size. The skin over the infiltration is bluish-red. In its center there are three necrotic foci surrounding the hair follicles. Palpation detects enlarged and painful submental lymph nodes. The body temperature is 38.5°C. Make the provisional diagnosis:
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A 47-year-old man came to a dentist to have a denture made for him. Objectively, his teeth 43, 44, and 45 are missing. What class of mandibular dentition defect is it according to Kennedy?
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A 44-year-old man came to a dental polyclinic to have a denture made for him. He complains of problematic chewing and an aesthetical defect. Objectively, his teeth 14, 15, and 22 are missing. According to Agape, the loss of masticatory efficiency in this case is:
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A 60-year-old woman complains of pain in her ears and in the area of her temporomandibular joint and her teeth clacking when she talks. Her removable complete dentures were made two weeks ago. Objectively, her nasolabial folds are smoothed out, her masticatory muscles are strained. What tactics shoud be chosen by a dental orthopedist in this case?
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During intraoral examination the dentist suspected that the patient has syphilis. What should the dentist do in this case?
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A 40-year-old man complains of constant decementation of the porcelain fused-to-metal crown on tooth 11. The crown was made for him one year ago. How must the stump of the prepared tooth look like for proper functioning of this type of dental crown?
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Examination of the oral cavity of a 12-year-old child revealed a carious cavity on the medial contact surface of tooth 46. The cavity is located within the mantle dentin, its walls and floor are pigmented and dense. Thermal stimuli provoke no response. Preparation of tooth 46 is painful in the area of dentinoenamel junction. The decay-missing-filled index is DMF + df = 2. What filling material will be optimal in this case?
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During preparation of a 38-year-old man for denture-making, a perforation of the pulp chamber floor was detected in the bifurcation area of tooth 46. Objectively, tooth 46 is immobile and has no periodontal pockets. X-ray shows completely filled root canals of tooth 46 without pathologic changes in their periapical area. In the bifurcation area of tooth 46, the apex of the interradicular septum is destroyed. What type of procedure is recommended in this case to retain the tooth?
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