Chapter 18, 22, 23
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| What is the appropiate action for a PA of the maxillary molar region that did not image the thid molar? a. position the image receptor higher b. Position the image receptor lower c. Move the image receptor forward d. Move the image receptor back further | d. Move the image receptor back further in the oral cavity.
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| Which will result in not recording the apex of the maxillary premolar teeth on a PA? a. IR not placed high enough. b. IR not placed toward the midline of the palate. c. Patient not occliding way down on the biteblock. d. Vertical angulation was excessive. | d. Vertical angulation was excessive.
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| What does herringbone error indicate? a. Embossed dot was positioned incorrectly. b. Lead foil was processed with the film. c. Film packet was placed in the oral cavity backwards. d. Temp. of the processing chemicals were not equal. | c. Film packet was placed in the oral cavity backwards.
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| When using the bisecting technique, which of theses errors results from inadequate vertical angulation? a. Elongation b. Foreshortening c. Conecut d. Overlapping | a. Elongation
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| What error results in overlapped contacts being more severe; the first and second molar than between the first and second premolar? a. Excessive vertical angulation b. inadequate vertical angulation c. mesiodistal projection of horizontal angulation | c. Mesiodistal projection of horizontal angulation
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| Overlapped teeth contacts renders a bitewing radiograph indiagnostic.What corrective action is needed? a. Increase the vertical angulation. b. decrease the vertical angulation c. shift the horizontal angulation toward the mesial | c. Shift the horizontal angulation toward the mesial.
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| Which of these conditions results from a failure to direct the central ray toward the middle of the image receptor? a. overlapping b. conecut c. elongation d. foreshortening | b. conecut
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| Which of these indicate an overexposed radiograph? a. clear image b. light image c. dark image d. double image | c. dark image
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| Each of the following will result in radiographs that are too light EXCEPT one. Which one is the EXCEPTION? a. hot developer solution b. old, expired film c. underexposing d. underdeveloping | a. hot developer solution
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| Each of the following will result in radiographs that are blank (clear) EXCEPT one. Which one is the EXCEPTION? a. no exposure to x-rays b. placing films in the fixer first c. extended time in warm water rinse. d. accidental white light exposure | d. Accidental white light exposure
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| If two films become overlapped together because they were inserted into the automatic processor too quickly, what is the result? a. Green films b. brown films c. light films d. black films | a. green films
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| Which of these indicates that a film was not properly washed? a. image appears light b. fogging results c. film turns brown d. white spots form | c. film turns brown
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| Each of the following will result in black artifacts on the radiograph EXCEPT one. Which one is the EXCEPTION? a. static electricity b. bent film c. glove powder d. fixer splash | d. fixer splash
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| Static electricity appears radiographically as black. a. thin lines b. starburts c. dots d. any of the above | d. any of the above
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| Each of the following is a cause of film fog EXCEPT one. Whic one is the exception? a. exposure to scatter radiation b. use of old, expired film c. double exposing the film d. chemical fume contamination | c. double exposing the film
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| A competent dental hygienist and dental assistant must be able to identify which of the collowing radiographically? a. caires b. periodontal abcess c. normal anatomy d. periapical pathology | c. normal anatomy
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| Which of the following facial bones would most likely appear on a periapical radiograph? a. occipital b. parietal c. frontal d. zygoma | d. zygoma
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| Bone sometimes has a mixed radiopaque-radiolucent appearance due to the nature of the a. cortical plates b. trabeculae patterns c. alveolar process d. genial tubercles | b. trabeculae patterns
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| Which of the following will most likely appear as a radiopacity outlini g the tooth root? a. PDL space b. lamina dura c. nutrient canal d. cementum | b. lamina dura
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| When nutrient canals open at the surface of the bone, they often appear radiographically as a. small radiolucent dots b. large radiopaque lines c. small radiolucent lines d. small radiopaque dots | a. small radiolucent dots
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| Which of these structures appears radiolucent? a. enamel b. cementum c. dentin d. pulp | d. pulp
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| A periapical radiograph of a 10-year old will most likely reveal developing permanent dentition. a. the first is true, second is false b. first is false, second is true c. both are true d. both are false | a. the first statement is true, the second statement is false.
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| On a periapical radiograph of the maxillary molars, which of the following structures may be recorded superimposed over the roots of the teeth? a. mastoid process b. maxillary tuberosity c. zygomatic process d. mylohyoid ridge | c. zygomatic process
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| Each of these features will appear radiolcent EXCEPT one. Which is the EXCEPTION? a. foramen b. suture c. canal d. spine | d. spine
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| Each of these features will appear radiopaque EXCEPT one. Which is the EXCEPTION? a. ridge b. sinus c. tubercles d. process | d. process
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| Each of the following may appear on a periapical radipgraph of the maxillary anterior region EXCEPT one. Which one is the EXCEPTION? a. nasal septum b. median palatine suture c. maxillary tuberosity d. inverted Y | c. maxillary tuberosity
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| Each of the following may appear ona periapical radiograph of the maxillary posterior region EXCEPT one. Which one is the EXCEPTION? a. maxillary sinus b. incisive foramen c. zygomatic arch d. hamulus | b. incisive foramen
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| A mandible landmark feature that may be imaged on a periapical radiograph of the maxillary posterior region is the a. mandibular canal b. submandibular fossa c. inferior border of the mandible d. coronoid process | d. coronoid process
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| Each of the following may appear on a periapical radiograph of the mandibular anterior region EXCEPT one. which one is the EXCEPTION? a. genial tubercles b. mental ridge c. coronoid process d. lingual forament | c. coronoid process
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| Each of the following may appear on a periapical radiograph of the mandibular posterior region EXCEPT one. Which one is the EXCEPTION? a. mental foramen b. pterygoid plate c. mandibular canal d. mylohyoid ridge | b. pterygoid plate
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| The inverted Y landmark is compsed of the intersection of what two structures? a. lateral wall of the nasal cavity and anterior border of the maxillary sinus b. lateral wall of the nasal cavity and soft tissue | a. lateral wall of the nasal cavity and anterior border of the maxillary sinus
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| Almalgam and a full metal crown can be distinguished from each otherradiogrpahically by their a. degree of radiopacity b. shape and margins c. location in the mouth d. use of retention pins | b. shape and margins
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| Which of these dental restorative materials appears most radiopaque? a. amalgam b. porcelain c. silicate d. acrylic resin | a. amalgam
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| Which of these dental restorative materials is most likely to mimic decay radiographically? a. gold b. stainless steel c. amalgam d. composite | d. composite
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| Dens in dente appears radiographically as a a. tiny tooth b. large tooth c. twin tooth d. tooth within a tooth | d. tooth within a tooth
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| A sharp bend in the tooth root is called a. taurodontia d. hypercementosis c. dilaceration d. exostosis | c. dilaceration
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| Radiographically its not possible to accurately differ between PA abscess, granuloma and cyst. radiographically it is not possible to differ between carcinoma and sarcoma. a. the first is true, second is false c. both are true d. both are false | c. both statements are true
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| Which of these appears radiolucent on a radiograph a. sialolith b. abscess c. torus d. odontoma | b abcess
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| a large radiolucency surrounding the crown only of an unerupted tooth is most likely what type of cyst a. dentigerous b. radicular c. residual d. periapical | a. detingerous
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| The evidence of resprption that appears to shorten the tooth root is called a. internal resorption b. external resorption c. primary resorption d. secondary resorption | b. external resorption
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| The radiograph appearance of a samll ovoid radiopacity within the pulp chamber of the tooth is called a... a. rhinolith b. phlebolith c. pulp stone d. pulp cap | c. pulp stone
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| Which of the following appears radiolucent in its early stages and as a radiopaque mass in later stages? a. condensing osteitis b. periapical granuloma c. osteosclerosis d. Periapical cemental dysplasia (PCD) | d. periapical cemental dysplasia (PCD)
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| Which of the following tumors appears radiolucent radiographically? a. torus palatinus b. odontoma c. sarcoma | b. odontoma
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| Radiographic evidence of a bone fracture appears as a radiolucent line that may resemble a... a. nutrient canal b. cyst c. tumor d. retained root tip | a. nutrient canal
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