Dental Assistant Test #4: Radiography, Infection Control, and Dental Procedures, Exams of Nursing

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Dental assistant test

what color are the gas tanks in a dental office? - Answer- oxygen=green nitrous=blue when nitrous oxide sedation is terminated, how is nitrous flushed from the system? - Answer- complete oxygen delivery for 5 minutes when is nitrous used in a dental office? - Answer- patient treatment when is nitrous not used in a dental office? - Answer- recreational purposes define MPD - Answer- maximum permissible dose. Exposure limit for those exposed to radiation how do you minimize genetic effects of radiation exposure - Answer- lead apron what does film speed have to do with radiation exposure - Answer- faster the film speed, the less radiation is necessary for each exposure what is the fastest film speed? - Answer- F-speed what are film holding instruments used for? - Answer- to keep hands and fingers from being exposed to x-ray how do you put the lead apron away and why? - Answer- should be hungup or laid over rounded bar rather than folded if the child is unable to hold the film, what should you do? - Answer- have the parent come in and hold the film what do you do if the tubehead drifts? - Answer- the arm should be immediately repaired what is "radioplaque" - Answer- structures appear white or light gray in radiograph. ie. metal, enamel, and dense bone what is radiolucent - Answer- appear dark or black on the radiograph. ie. air spaces, soft tissue, and dental pulp

what is contrast - Answer- difference between the shades of gray what is density - Answer- blackness or darkness of a radiograph what are the different types of intra-oral x-ray views - Answer- 1) periapical

2. bite-wing
3. occlusion how many bite-wings are taken of patients - Answer- adults= 4 children= 2 what size bite-wings are used on adults - Answer- size 2 when taking a premolar bitewing, what should be included? - Answer- distal half of crowns of cuspids, both premolars, and first molars what is the purpose developing solution - Answer- it soffens the emulsion what is the purpose of fixer solution - Answer- removes unexposed silver halide crystals what are the advantages of digital radiography - Answer- eliminates chemical processing no chemical waste exposure time is much shorter than conventional x-ray what are the disadvantages of digital radiography - Answer- initial setup cost what are the two different types of dental radiography - Answer- 1) solid-state technology
4. phosphore storage plate how quickly are images recorded to the computer when using PSP's - Answer- 0.5- seconds how can you maintain infection control when using a digital sensor? - Answer- sensor must be covered with a disposable barrier because it can't be heat sterilized describe the results of vertical angulation - Answer- stretches the image what results when there is incorrect horizontal angulation - Answer- overlap who owns dental radiographs - Answer- dentist who is the holder of privilege - Answer- patient what are the red XCP's used for? - Answer- bite wing exposures

what are blue XCP's used for? - Answer- anterior PA exposures what are yellow XCP's used for - Answer- posterier exposures where should the embossed dot be when mounting an x-ray? - Answer- dot up what is the unexposed panoramic film encased in and why - Answer- in a cassette because it's light sensitive what produces a blurred image - Answer- patient movement what is calculus and tartar made up of - Answer- plaque the bacteria found in biofilm are the primary causes of - Answer- dental carries and periodontal disease what is dimineralization? - Answer- loss of calcium and phosphate what is an abrasion? - Answer- tooth loss usually caused by excessive brushing what is a floss threader? - Answer- used to remove biofilm and debris from under bridges and orthodontist appliances what is flourosis - Answer- long-term exposure of fluoride what can be said about the levels of fluoride in fluorinated water - Answer- its so low that its not toxic what does cariogenic mean - Answer- producing or promoting decay after establishing open communication and a safe learning environment, what is the next step in active patient education - Answer- listen to patients concerns regarding oral health what is a prophy - Answer- cleaning. complete removal of calculus, debris, stains, and biofilm is prophy the same as coronal polishing? - Answer- no define extrinsic stain - Answer- occurs on the external structure of the tooth and can be removed by scaling or polishing define intrinsic stain - Answer- occurs within the enamel and cannot be removed

list and define the two types of intrinsic stains - Answer- endogenous- occurs during tooth development exogenous- occurs after eruption when are sealants recommended - Answer- deep pit and fissures are present tooth has recently erupted when are sealants not recommended - Answer- if pit and fissures are not deep occlusal surfaces is decayed primary tooth will be lost soon non-cooperative patient