A 6-year-old patient has a dark brown discoloration of his maxillary central incisor. The discoloration started following trauma accompanied with a facial
... [Show More] sinus tract. What is the treatment-of- choice?
A. Extraction
B. Pulpectomy
C. Pulpotomy
D. Direct pulp treatment - ANSWER-A. Extraction
Squamous cell carcinoma appears in a variety of locations. In which of the following locations is its prognosis the LEAST favorable?
A. Lower lip
B. Floor of the mouth
C. Hard palate
D. Buccal mucosa - ANSWER-B. Floor of the mouth
Although a dentist wishes to use the long-cone paralleling technique (40 cm source-object distance), the x-ray machine is equipped with only a short cone (20 cm PID). As a result, the dentist moves the machine away from the patient's face so the source-object distance is 40 cm and adjusts the exposure time appropriately. Compared to the degree of tissue covered by an actual long cone, this "extended" short cone exposes what amount of tissue?
A. More
B. The same
C. Less - ANSWER-A. More
Fluoride therapy and occlusal sealants modify which of the following four factors the most?
A. Host
B. Time
C. Substrate
D. Microflora - ANSWER-A. Host
Which of the following drugs produces sufficient central nervous system depression to cause a state of sleep from which one may be aroused?
A. A sedative
B. A hypnotic
C. An opiate
D. An anesthetic - ANSWER-B. A hypnotic
Which of the following usually causes the slow progress in molar uprighting in an adult patient?
A. Appliance friction
B. Excessive deep bite
C. Occlusal interferences
D. Poor patient cooperation
E. Lack of anchorage control - ANSWER-C. Occlusal interferences
Porcelain failure in all-ceramic restorations can best be avoided if the
A. occlusal forces are minimal.
B. ceramic material is not over 1/2 mm in thickness.
C. ceramic material is 1 1/2 mm in thickness.
D. angles of the preparation are rounded. - ANSWER-D. angles of the preparation are rounded.
Squamous cell carcinoma of the tongue MOST commonly metastasizes to which of the following?
A. Lungs
B. Liver
C. Bones
D. Cervical nodes - ANSWER-D. Cervical nodes
To reduce a patient's salivary flow, a dentist has prescribed atropine. As a result of this medication, the patient might experience which of the following side effects?
A. Sedation
B. Diarrhea
C. Bradycardia
D. Blurred vision
E. Stomach cramping - ANSWER-D. Blurred vision
Which of the following is the OPTIMAL reduction for the lingual cusp on Tooth #3 to receive an MODL onlay?
A. 1.0 mm
B. 1.5 mm
C. 2.0 mm
D. 2.5 mm - ANSWER-B. 1.5 mm
Of the following local anesthetics, which has intrinsic vasoconstrictive actions?
A. Cocaine
B. Procaine
C. Xylocaine
D. Bupivacaine - ANSWER-A. Cocaine
During an interview, a dentist asks a patient, "You are not afraid of dentistry, are you?" This is an example of which type of question?
A. Leading
B. Closed
C. Open
D. Funneling - ANSWER-A. Leading
To be effective in translating the roots of teeth, an orthodontic appliance must be
A. very gentle in action.
B. augmented with extraoral force.
C. capable of exerting a torque or moment.
D. capable of exerting positive, intermittent forces. - ANSWER-C. capable of exerting a torque or moment.
Which of the following conditions can cause delayed eruption of permanent teeth?
A. Cherubism
B. Hyperthyroidism
C. Hyperparathyroidism
D. Paget's disease of bone - ANSWER-A. Cherubism
Class I carious lesions are the LEAST likely to occur on which of the following?
A. Lingual surfaces of mandibular incisors
B. Lingual surfaces of maxillary incisors
C. Lingual surfaces of maxillary molars
D. Facial surfaces of mandibular molars - ANSWER-A. Lingual surfaces of mandibular incisors
Inhalation of 100% oxygen is contraindicated for a person who has
A. a flail chest.
B. pneumothorax.
C. acute bronchitis.
D. acute viral pneumonia.
E. chronic obstructive lung disease. - ANSWER-E. chronic obstructive lung disease.
Which of the following antibiotics is found at much higher concentrations in crevicular fluid than in serum?
A. Clindamycin
B. Penicillin
C. Metronidazole
D. Tetracycline - ANSWER-D. Tetracycline
Selective beta1-adrenergic agonists produce which of the following effects?
A. Glycogenolysis
B. Increased cardiac output
C. Decreased peripheral resistance
D. Relaxation of bronchial smooth muscle - ANSWER-B. Increased cardiac output
Which of the following exhibits neoplasia of both the epithelial and connective tissue components?
A. Ameloblastoma
B. Cementoblastoma
C. Ameloblastic fibroma
D. Odontogenic adenomatoid tumor - ANSWER-C. Ameloblastic fibroma
Non-working interferences usually occur on the inner aspects of the
A. facial cusps of maxillary molars.
B. facial cusps of mandibular molars.
C. lingual cusps of mandibular molars.
D. facial cusps of maxillary premolars. - ANSWER-B. facial cusps of mandibular molars.
Which of the following is MOST likely to play a role in the development of dental anxiety?
A. Hearing upsetting stories about going to the dentist
B. Being anxious with all health care providers
C. Being criticized by the dentist or hygienist for neglect of oral hygiene
D. Having had a specific frightening or painful experience in the dental office - ANSWER-D. Having had a specific frightening or painful experience in the dental office
When administered as oral centrally acting analgesics, which of the following is considered to have the highest dependence liability?
A. Codeine
B. Oxycodone (in Percodan®)
C. Propoxyphene (Darvon®)
D. Pentazocine (Talwin®) - ANSWER-B. Oxycodone (in Percodan®)
A vital permanent tooth has an irreversible pulpitis and an open apex. Which of the following represents the treatment-of-choice for this tooth?
A. Formocresol pulpotomy
B. Indirect pulp therapy
C. Calcium hydroxide pulpotomy
D. Conventional root canal therapy
E. Apexification - ANSWER-E. Apexification
Each of the following is associated with Sjogren's syndrome EXCEPT one. Which one is the EXCEPTION?
A. Arthritis
B. Xerostomia
C. Cervical caries
D. Warthin's tumor
E. Keratoconjunctivitis sicca - ANSWER-D. Warthin's tumor
A permanent tooth with a mature apex has become intruded deeply into the bone. As a result of this trauma, which of the following pulpal changes is the most likely to occur?
A. Necrosis
B. Internal resorption
C. Calcific metamorphosis
D. Transient inflammation - ANSWER-A. Necrosis
Trigeminal neuralgia (tic douloureux) is characterized by
A. paralysis of one side of the face.
B. uncontrollable twitching of one eye.
C. sharp, excruciating pain of short duration.
D. prolonged episodes of pain in one side of the face.
E. dull pain when pressure is applied over the affected area. - ANSWER-C. sharp, excruciating pain of short duration.
An individual has just received the first in a series of three hepatitis B vaccines. For the seroconversion of this series to be the most effective, the person should receive the second and third vaccinations how many months later?
A. Second vaccination one month later, third vaccination three months later
B. Second vaccination one month later, third vaccination six months later
C. Second vaccination two months later, third vaccination three months later
D. Second vaccination three months later, third vaccination six months later - ANSWER-B. Second vaccination one month later, third vaccination six months later
Each of the following statements describes intracanal instruments and their action EXCEPT one. Which one is this EXCEPTION?
A. A K-type file can be used in a filing and reaming action, while a reamer can be used in only a reaming action.
B. Clockwise-turning of a root canal instrument will force debris in an apical direction, while counterclockwise-turning will cause debris to move in a coronal direction out of the canal.
C. A reaming action will enlarge a root canal and produce a cross-sectional preparation that is approximately round in shape.
D. An intracanal instrument is more susceptible to breakage if locked in dentin and then rotated. - ANSWER-B. Clockwise-turning of a root canal instrument will force debris in an apical direction, while counterclockwise-turning will cause debris to move in a coronal direction out of the canal.
The usual metabolic pathway of ingested fluoride involves urinary excretion primarily, with the remaining portion found largely in
A. teeth.
B. muscle tissues.
C. skeletal tissues.
D. epidermal tissues. - ANSWER-C. skeletal tissues.
Pain that has no organic basis and that is fixed upon some portion of the anatomy is usually referred to as
A. false.
B. psychogenic.
C. referred.
D. phantom. - ANSWER-D. phantom.
In MOST instances, intraoral verruca vulgaris develops as the result of
A. trauma.
B. pipe smoking.
C. autoinoculation.
D. chronic alcoholism. - ANSWER-C. autoinoculation.
What happens to the permanent molar occlusion in the presence of a flush (straight) terminal plane and mandibular primate spaces?
A. Erupts end-to-end; early mesial shift into Class I occlusion
B. Erupts end-to-end; late mesial shift into Class I occlusion
C. Erupts with Class II tendency
D. Erupts with Class III tendency - ANSWER-A. Erupts end-to-end; early mesial shift into Class I occlusion [Show Less]