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KROK 2 Dentistry 2009 Questions | KROKEXAM
Browse 2009 KROK 2 Dentistry exam questions with answers and explanations.
Exam questions
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A 45-year-old female patient complains about pain caused by thermal srtimuli and spontaneous pain in the 26 tooth. A week ago this tooth was treated for pulpitis. Objectively: the 26 tooth is filled, percussion is painful, thermal stimulus causes slowly intensifying long-lasting pain. X-ray picture shows that the palatine canal is filled by 2/3, buccal canals contain no filling material. What is the most probable cause of this complication?
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Preventive examination of a 7-year-old schoolboy revealed unremovable grey-and-white layerings on the mucous membrane of cheek along the line of teeth joining. Mucous membrane is slightly hyperaemic, painless on palpation. The boy is emotionally unbalanced, bites his cheeks. What is the most likely diagnosis?
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A 48-year-old patient complains about itching gums. Objectively: gums are dense, of normal colour; cold water causes short-term toothache. X-ray picture shows osteosclerosis of interalveolar septa (fine granular bone texture), height of interalveolar septa and integrity of compact substance on their tops is unchanged. Which diagnosis is the most likely?
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A 26-year-old patient needs an inlay for a class V cavity of the 35 tooth. During the cavity preparation a prosthodontist has accidentally opened the pulp. What might be the most probable cause of this complication?
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Parents of a 9-year-old boy complain about permanently open mouth of the child. External examination revealed elongation of the lower face part, nonclosure of lips. Examination of the oral cavity revealed early mixed dentition. Relationship of the first permanent molars is neutral, vertical space is 5 mm. What is the most likely diagnosis?
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After removal of dental deposit an 18-year-old patient underwent preventive examination. It revealed painless chalky spots in the precervical area on the vestibular surface of the 22 and 41 teeth. Result of enamel resistance test is 7. What morphological changes are typical for this disease?
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A 32-year-old patient complains about gingival hemorrhages during eating and tooth brushing. It is known from the anamnesis that 2 weeks ago the patient got a cast metal crown. Objectively: the 27 tooth has a cast metal crown going beyond the gingival edge by 1-1,5 mm, touching causes hemorrhage. Percussion is slightly painful. What tactics is the most appropriate in this case?
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A 50-year-old patient complains about missing of the 37, 36, 45, 46, 47 teeth. The 35, 38, 44, 48 teeth are intact and stable, their crowns exhibit anatomic form, sufficient height, relative paralleli- sm. Fulcrum line typically goes through the 35 and 44 abutment teeth. What fixing element should be used in a clasp denture supported by the 35, 44 teeth?
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A 25-year-old patient complains about a cosmetic defect in the frontal part of his upper jaw on the left. Objectively: the 23 tooth is pulpless. The filling restores vestibular-approximal surface of the tooth crown by 1/3, it is stable, closely fits within cavity walls, its colour doesn't match the colour of the tooth. The tooth itself has changed its colour, its percussion is painless. What is the optimal prosthetic construction for this patient?
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A 12-year-old patient complains about gingival hemorrhage and tooth mobility. He has been suffering from this since the age of 4. Objectively: gums around all the teeth are hyperemic and edematic, bleed during instrumental examination. Tooth roots are exposed by 1/3 and covered with whitish deposit. II-degree tooth mobility is present. Dentogingival pouches are 4-5 mm deep. External examination revealed dryness and thickening of superficial skin layer on the hands and feet, there are also some cracks. What is the most likely diagnosis?
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A 20-year-old patient complains about feeling spontaneous undurable localised pain in the 26 tooth for one day. Objectively: the 26 tooth has a deep Black's class I carious cavity. Dentine of its walls and floor is unpigmented, softened, carious cavity is not communicating with the tooth cavity. Probing causes acute pain focused at a single point, cold test induces long-lasting pain. What method of treatment is the most appropriate in this case?
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A 42-year-old patient complains about acute pain in the region of the left temporomandibular joint (TMJ) that irradiates to the ear; headache, general indisposition, impossible mastication and limited mouth opening. Objectively: the patient's face is asymmetric due to the edema in the region of the left temporomandibular joint. The skin in this region is hyperemic. The pain is made worse by the smallest movements of mandible. Palpation of the joint causes acute pain. Mouth opening is limited down to 15-20 mm. What is the most likely diagnosis?
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A 42-year-old patient complains about pain in the submandibular and sublingual region that is getting worse during eating; body temperature rise up to 37,6°C. The patient has been suffering from this for 2 months. Objectively: along the right sublingual plica there is infiltration, hyperaemia, edema of soft tisues, acute pain on palpation. The duct of the right submandibular salivary gland discharges turbid saliva with pus admixtures. What is the most likely diagnosis?
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A 4-year-old girl presents with body temperature rise, aggravation of general condition. The symptoms has been observed for 3 days. Objectively: general condition is grave, body temperature is 38,6°C, the girl is anxious and pale. She presents also with halitosis, hyperaemia and edema of gingival mucous membrane in the region of the 83, 84, 85 teeth on both sides from the alveolar process. The mentioned teeth are mobile, their percussion causes acute pain; the 84 tooth is filled. What is the most likely diagnosis?
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A 38-year-old female patient came to a hospital and complained about a wound on her left cheek. She got this trauma 1618 hours ago, didn't loose consciousness. Objectively: a 3 cm long injury of skin, subcutaneous fat and muscle. The wound is bleeding. What kind of initial surgical d-bridement should be performed?
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A 47-year-old patient consulted a dentist about dental cervix exposure on both jaws. Objectively: the dentitions are intact, the dental cervixes are exposed. Untimely teeth contacts are present. It is planned to perform selective grinding. What controlling method should be chosen?
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During extraction of the 47 tooth its distal root was broken halfway along its length. What tool should be chosen for extraction of the residual root fragments?
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A 31-year-old patient consulted a dentist about teeth sanitation. Objectively: in the precervical region of the 13 and 23 teeth there are irregularly-shaped defects of hard tissues within deep layers of enamel. The floor of the defects is rough, their edges are chalky. What tactics should be chosen as to these defects?
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A 51-year-old female patient complains about food sticking in a right inferior tooth. Objectively: distal masticatory surface of the 45 tooth has a deep carious cavity filled with dense pigmented dentin that doesn't communicate with the tooth cavity. The patient was diagnosed with chronic deep caries. What method of examination allowed the dentist to eliminate chronic periodontitis?
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An 18-year-old patient complains about body temperature rise, weakness, pain induced by eating and deglutition. Objectively: mucous membrane of the oral cavity is erythematic with multiple petechia. Pharynx is hyperaemic. Regional lymph nodes are enlarged, mobile, painless. In blood: leukocytosis, monocytosis, atypic mononuclears, ESR is 30 mm/h. What is the leading factor of disease development?
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A female patient consulted a stomatologist about inability to close her mouth, speech difficulty. Objectively: the oral cavity is half-open, there is drooling, central line deviates to the right. There is a depression in front of the tragus, and above the malar arch the mandibular condyle bulges inward the infratemporal fossa. What is the most likely diagnosis?
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Analysis of a 10-year-old boy's jaw models revealed that occlusal plane of the frontal maxillary teeth was of concave form, its lateral parts were convex. Form of the alveolar process also represents deformation of dental arches. The upper jaw is of saddle-like form with abrupt narrowing in the region of premolar teeth. What type of bite is it?
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A 50-year-old patient complains about increased sensibility of the exposed tooth cervixes, displacement of teeth, gum itch, pain in the region of the 43, 42, 41, 31, 32, 33 teeth caused by chemical and thermal stimuli. Objectively: the gums are dense and anemic. X-ray picture shows atrophy of the alveolar bone reaching 2/3 of interalveolar septa height. What is the most likely diagnosis?
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A 32-year-old patient complains of a fistula in the submandibular region. Objectively: cheek is swollen in the region of mandible on the left, palpation revealed induration of soft tissues. In projection of the 35, 36 teeth there is a fistula containing pus and granulations. X-ray picture shows destruction of bone, sequestrum. What is the most likely diagnosis?
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A 23-year-old patient complains about a small ulcer on the red border of her lower lip that has been irresponsive to self-treatment for two weeks. Objectively: unchanged red border of lower lip has a circular ulcer of 2 mm in diameter with raised regular edges, its floor is of meatlike colour, dense, shiny, with "stearic film", with cartilaginoid infiltration, painless on palpation. Regional lymph node is enlarged, of tight elastic consistency, painless, mobile. What is the most likely diagnosis?
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A 39-year-old patient needs a clasp denture with porcelain teeth for the lower jaw. What method should be applied while substituting wax with plastic in order to avoid mold flash that may cause bite opening?
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X-ray picture depicts a circular well-defined area of bone tissue destruction 0,7x0,7 cm large in the projection of root apex. What is the most likely diagnosis?
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A 29-year-old patient complains about acute attack-like pain in the region of his upper jaw on the left, as well as in the region of his left maxillary sinus, eye and temple. The pain is long-lasting (2-3 hours), it is getting worse at night. The patient has a history of recent acute respiratory disease. Objectively: the 26 tooth has a carious cavity, floor probing is painful, thermal stimuli cause long-lasting pain, percussion causes slight pain. What is the most likely diagnosis?
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A 45-year-old patient complains about pain in his mandible that arose after extraction of the 36 tooth. Objectively: alveolar socket is covered with bloody clot. X-ray picture shows unextracted root of the 36 tooth. What tools are necessary for extraction of this root?
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A patient complains of pain and swelling in the right submandibular area. She has been treating the 45 tooth for a week. Objectively: body temperature is 38°C. There is a painful tense infiltration in the right submandibular region. The skin doesn't make a fold, its hyperemic and glossy. The mouth can be opened by 3 cm. Deglutition is painless. These clinical findings correspond with the following disease:
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A 5-year-old boy presents with body temperature rise up to 39,2°C, sore throat, headache, nausea. Objectively: mucous membrane of soft palate and palatine arches is evidently hyperemic, there is distinct border between it and surrounding tissues. The child's tongue is dry, edematic, its lateral surfaces are red and free of fur, fungiform papillae are evidently enlarged. Face skin is covered with spotty rash, hyperemic except for pale nasolabial triangle. Submandibular lymph nodes are painful on palpation. What is the causative agent of this disease?
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Preventive examination of a 4,5-year-old child revealed untimely missing of all the upper molars. The lower incisors contact with mucous membrane of palate. What is the tactics of choice?
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A 20-year-old patient complains about a carious cavity in an upper right tooth. Objectively: the 16 tooth has a deep carious cavity communicating with the tooth cavity, probing at the opening point is painless, percussion of the 16 causes mild pain. There is a fistula on the gingiva in the region of root apex projection of the 16 tooth. What is the most probable diagnosis?
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A 16-year-old patient complains about a cosmetic defect in form of white spots in the region of the upper frontal teeth. The defect was revealed long ago and doesn't change with time. Objectively: white spots on the vestibular surfaces of the 11,12,21, 22 teeth close to the cutting edge and on the vestibular surfaces of the 16,26,36,46 teeth close to the masticatory surface. On probing the spot surface was smooth, painless; cold stimulus produced no pain. The spots couldn't be stained with 2% solution of methylene blue. What is the most likely diagnosis?
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A 35-year-old patient complains about a cavity in a lower jaw tooth on the left, and the pain caused by sweet, sour and solid food. Examination of the 36 tooth revealed a deep carious cavity filled with light softened dentine. Probing of the carious cavity floor is painful, reaction to the cold stimulus is painful, undurable. What is the most likely diagnosis?
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A 31-year-old male patient complains of dryness and burning of tongue back that appeared for about a week ago and get worse when he eats irritating food. The patient has a history of recent pneumonia. He had been treated in the in-patient hospital for 2 weeks, the treatment program included antibiotics. Now he doesn't take any drugs. Objectively: mucous membrane of the oral cavity is hyperemic, dry, glossy. Tongue back and palate have greyish-white plicae that can be easily removed. Threads of saliva trail behind the spatula. What is the most likely diagnosis?
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A 53-year-old patient consulted a prosthodontist about lateral teeth mobility, frequent falling out of fillings. Objectively: all the molars and premolars of the lower jaw exhibit I degree mobility. Approximal masticatory surfaces have fillings. What splint construction should be applied in this case?
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A 28-year-old patient consulted a prosthodontist about dental prosthetics. Objectively: crown of the l3 tooth is decayed by 2/3 of its height, the stump sticks out above the gum line by 2 mm. X-ray picture shows that the root canal is filled up to the top. What construction should be fabricated for the patient?
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A 65-year-old patient complains about partially missing teeth on his upper jaw, difficult mastication, rhinolalia. Objectively: the 18, 16, 15, 11, 23, 28, 35, 38, 48, 47 teeth are missing; there is postoperative midline defect of hard palate. It was decided to make a clasp dental prosthesis with obturating part. The obturating part should be placed on the following element of the clasp dental prosthesis:
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A 10-year-old boy consulted a dentist about pain in the palate during eating. Objectively: the lower third of his face is shortened, mouth opening is not limited. By joining the teeth the cutting edge of inferior incisors contacts with the mucous membrane of palate. Mucous membrane in the contact point is hyperemic, slightly edematic. Lateral teeth exhibit Angle's class I malocclusion. What is the most appropriate plan of treatment of the lower jaw?
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