NDAEB exam 2 Questions with Answers, Graded to Pass

Periodontal disease - Infection of the structures that support the teeth (gums and bones) Mercury, silver & tin - What is amalgam fillings composed of Periodontal disease - Bone loss in the jaw is an indication of what disease Concept of radiation that states that exposure should be kept "as low as resonably possible" - What is the ALARA concept Positive - Anode Negative-Cathode - What is the positive & negavtove electrode in the x-ray tube Film, phosphorous storage plate, digital sencor - What are examples of inage receptors •To help the dentist see conditions in the mouth not visitble to the eye - •What is the purpose of dental x-rays ▪bone loss ▪info during dental procedures (ex: root canal therapy) ▪locate abnormalities in the soft & hard tissue ▪evaluate growth & development ▪Identify early dent caries - •What can a dentist see on an x-ray that he canot see with just his eyes Film based or digitally produced recording of anatomic structures - What is an IMAGE (in radiology) With radiation - How are dental images produced The process of recording images of the teeth & adjacent structure by exposure to x-radiation - What is dental radiography •tubehead •extension arm •control panel - What are the main components of an x-ray mashine •it is a metal housing that contains the X-RAY TUBE •it is filled with INSULATING OIL which prevents overheating (by absorbing the heat created by x-ray) •this is where the x-rays are produced •this is where the TRANSFORMER is located. (The transformer alters the voltage) - Describe the tubehead & it's function •It is an open ended lead-line cylinder that extends from the opening of the metal housing (metal housing=tubehead) - Describe the PID & it's function •LEAD COLLIMATOR - small metal disc with small opening in the center (it form the size and shape of the x-ray beam as it leaves the tubehead & goes to the PID) •ALIMINUM FILTER - is 0.5mm thick. It filters out the non-penetrating, long-wavelengths - What are the 2 things in the PID that shape and filter the x-ray beam Shorter -shorter wavelengths are the MOST useful in dentistry! - The _________ (shorter/longer) the wavelength the GREATER the energy Heart of the mashine= x-ray tube (it contains the cathode (-) and anode (+) andnis vacune sealed to allow electrons to flow with minimum resistance) •Located in tubehead - •What is the "heart" of the x-ray mashine? •where is it located? •The hollow exention arm help POSITION the tubehead to the patients cheek. •The wires that CONNECTS the TUBEHEAD and the CONTROL PANLE are enclosed in the extention arm. - What is the purpose of the extention arm Located: on wall outside x-ray area -it contains: •MASTER SWITCH (turns mashine on/off) •SELECTOR BUTTON (used to select exposure time in milliamperage (mA) and kilovoltage (kV)) •INDICATOR LIGHT (turns orange to show that master switch is on) •EXPOSURE BUTTON (conteols flow of electricity to generate x-rays) - Decribe the control panel & where is it located Yes, it is safe to leave it on all day. It does not produce ratiation unless the eposure button is being pressed! - Is it safe to leave the x-ray mashine on all day