DEFINITIONS
Controls the QUALITY of xray beams
(penetrating ability)
What is kVp?
High contrast xrays are useful in detecting
What is dental caries?
(black and white)
Percent of energy within tube-head that is converted to x-rays
What is 1%?
Structures that are dense and resist the passage of xray beams will appear
What is radiopaque?
Ideal mounting recommendated by American Dental Association
What is labial mounting?
(identification dot convex)
Controls the QUANITY of xray beams
(# of xray emitted/produced)
What is mA?
A high kVp will result in a film with ____ contrast
What is low contrast?
(many shades of grey)
3 types of transformer used in dental x-ray production
What are step down, step up, autotransformer?
Healthy anterior alveolar crest (bone) appears
What is pointed / sharp?
A high frequency wavelength with dental x-rays will have
What is short wavelengths with more penetrating ability?
Term to describe how dark and light areas are differentiated
What is contrast?
An increase in mA requires you to decrease
What is exposure time?
Aluminum filters (within tubehead) are placed in path of xray beam to
Healthy posterior alveolar crest (bone) normally appears
What is flat and smooth?
When mounting FMX you should organize xrays by
(detail)
What is BW's, maxillary anteriors, mandibular anteriors, maxillary posteriors, mandibular posteriors?
Radiation that is capable of producing ions by removing or adding an electron to an atom
What is ionizing radiation?
**USED IN DENTAL RADIOGRAPHY*
3 factors (specifically) that directly influence the density of a dental image
What is kVp, mA, exposure time?
Part within the dental tube-head that converts electrons into x-ray photons
What is the tungsten target of the anode?
Curve of max AND man arch when mounting dental xrays
Receptor placement difference when paralleling VS bisecting
What is paralleling = closer to center of oral cavity, bisecting = against lingual of tooth?
What is the short and long wavelengths?
*See PG 450*
(inverse square law)
What is reduce to 1/4 intensity?
Describe in DETAIL how an xray moves through tubehead
*800 points!!*
Machine turned on -> electrical current enters
Current-> step down transformer
Cathodes supply electron necc. to generate x-ray travel -> anode
Tungsten filament of cathode (made of coiled wire) produces the electrons when heated
Exposure button is pushed electrons travel from cathode -> anode
Anode is the positive electrode which has a tungsten plate (target) to convert electrons into x-ray photos
Copper stem removes heat -> oil
Xrays travel through aluminum disks which filter longer wavelengths -> collimator which restricts size of beam
Lamina dura appears as a
What is dense, thin radiopaque line around tooth?
*See page 339*
Describe primary radiation VS secondary radiation VS scatter radiation