NDAEB 42 MDA Ch. 42 Study Guide Exam With Answers, Exams of Dentistry

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NDAEB 42 MDA Ch. 42 Study Guide

Exam With Answers.

A collimator inside the tubehead is always shaped as what? - ✔✔A thin vertical slit. A panoramic image will not distinguish what? - ✔✔Soft tissue What information will a panoramic xray provide about buccal and lingual areas? - ✔✔Widths and location A computed tomographic energy source is? - ✔✔X radiation What radiograph provides a 3 dimensional image? - ✔✔Cone beam computed tomographic ( CBCT ) Who uses skull radiographs most? - ✔✔Orthodontics and oral surgeons What does a CBCT image provide information on? - ✔✔The exact placement of implants, position of impacted teeth, and the mandibular nerve. On panoramic xray units, what else is included? - ✔✔Cephalostats

What is the purpose of a grid? - ✔✔To reduce scatter radiation What causes an exaggerated smile line? - ✔✔The chin being tilted too far down Panoramic xrays can be used to observe tooth eruption patterns. T/F? - ✔✔True What is observed on an edentulous patient? - ✔✔Bone loss In addition to a panoramic unit, what else is needed to produce an image? - ✔✔Cassette, film, and intensifying screens. We will always use what type of xray if a patient is incapable of opening their mouths wide, are unable to fit a film in their mouths, and when we need to view wide portions of the skull? - ✔✔Panoramic xray On the newer digital panoramic units, we are able to see what? - ✔✔Interproximal decay, location of impacted wisdom teeth, and lesions in the mandible. With digital, xrays are described as what? - ✔✔Images

On the Frankfort plane, the proper position of the chin is what? - ✔✔Parallel to the floor What is done with the lips during a panoramic xray? - ✔✔They are closed What is done with the tongue during a panoramic xray? - ✔✔Pushed to the roof of the mouth What does the patient do first during a panoramic xray? - ✔✔Swallow The 2 most common skull radiographs in dentistry are? - ✔✔Lateral supplimentric projection and posterior/anterior projection What are the advantages of panoramic xrays? - ✔✔Less exposure, faster/easier, and youre able to see both jaws on one film. What makes the teeth look skinny and narrow on a panoramic xray? - ✔✔Patient is biting too far forward on the biteblock What makes the teeth look short and wide on a panoramic xray? - ✔✔Patient is biting too far back on the biteblock.

What is a focal trough? - ✔✔A U shaped area that's used for jaw placement. Extraoral means what? - ✔✔Outside the mouth. A focal trough is also known as what? - ✔✔The image layer. If someone has jewelry or another foreign object in the face, what will it cause on a panoramic xray? - ✔✔Ghost image on opposite side of its placement. What does a panoramic xray show dentists? - ✔✔all related dentition and dental structures. Do we use a panoramic xray to detect decay? - ✔✔No Who mandates the MA's and KVP's be automatically set and can they be changed? - ✔✔The federal government and they cannot be changed. What are the two types of panoramic xray machines? - ✔✔Film based and direct ( digital )

With direct ( digital ) panoramic radiographs, what two things are required to create the image? - ✔✔Computer and sensor A panoramic radiograph will show entire maxillary and mandibular jaws. T/F? - ✔✔True The joint in your jaw is referred to as what? - ✔✔TMJ What type of radiographs are taken to show the jaw joint ( TMJ)? - ✔✔Cephalometric All panoramic images are two dimensional. T/F? - ✔✔True What are the 5 parts to the panoramic unit? - ✔✔Forehead rest, chin rest, biteblock, tubehead, exposure controls.