Dental Radiography Principles and Techniques CH 6, 18, and 21

The difference in the degrees of blackness between adjacent areas on a dental radiograph is termed

contrast

the capability of the receptor to reproduce the distinct outlines of an object is called

sharpness

by placing the PID perpendicular to the tooth and receptor, and the receptor parallel to the tooth, a radiographer can minimize

overlap

to evaluate the maxillary or mandibular arch in one image a dental hygienist could take an ________________ examination

occlusal

a stepwedge is composed of

aluminum

a dental image that exhibits very dark areas and very light areas is said to possess _________ contrast

high

magnification

the geometric characteristic that refers to an image that appears larger than its acutal size is

the paralleling technique can result in magnification due to IR replacement. what an the radiographer change to compensate for this magnification?

a longer PID and target receptor distance results in less image magnification

radiopaque

refers to the portion of an image that appears light or white

what dental materials appear the most radiopaque

metals, amalgam restorations, PFM crowns

radiolucent

refers to the portion of an image that is dark or black

what part of the tooth appears the most radiolucent

pulp

an increase in density can result when there is an increase in the following

kVp

The overall blackness or darkness of an image is termed

density

what factors can improve sharpness of an image

focal spot size
film compensation
movement

a __________ image is used to evaluate the crown, roots, and supporting bone of a tooth

periapical

if a patient has an edentulous area when taking bitewings, the radiographer can use __________ ___________ to help stabilize the receptor

cotton rolls

an increase in the subject thickness will result in an image with _______ density

high

which exposure factor controls contrast on an image

mA and exposure time

a variation in the true size and shape of the object is called

distortion

if you are treating a patient that has no clinical signs of disease, how frequently should you take a FMX on this patient

5 years

the panoramic image is an example of an __________ technique for a dental image examination

extraoral

how many dental images would you take if you wanted to obtain a full mouth series of x-rays

13-20 images (we take 18 at our clinic)

a ___________ image is used to evaluate the interproximal areas of the crowns of both maxillary and mandibular teeth in a single image

bitewing

occlude

the word used for closing or biting down is to

the paralleling technique (preferred) or the bisecting technique can be used for ____________ images

intraoral

the. purpose of the identification dot located on a traditional film is used for

film orientation

the mesial edge of the IR should be placed at the midline of the _________________ when taking a molar bitewing image

first premolar

what receptor size is recommended for an adult bitewing

size 2

when should adult bitewings be taken vertically

when they have periodontal disease

for patients that have a sensitive gag reflex, it is recommended to take ______ images first and then complete the posterior periapicals and bitewings

anterior

overlapped IP contacts are always due to improper _______________ angulation

horizontal

what size receptor should you use for a pedodontics patient

size 0