Exam 2 Flashcards
What Beam Alignment device is used in the UNMC COD clinic?
RInn XCP instrument
How much does a Periapical radiograph capture?
The entire root and approximately a 2mm apical to it
Can open contacts to see interproximal caries
What are the different PA projections?
MX CI Projection MX LI Projection MX C Projection MX PM Projection MX M Projection
MD Incisal Projection
MD C Projection
MD PM Projection
MD M Projection
What is the goal of a premolar PA projection?
To open up the interproximal contact between the 1st and 2nd PM
What is the goal of a molar PA projection?
To image the most distal tooth entirely while capturing the distal half of the 2nd PM
What radiographs are to be taken on an edentulous patient?
PAs with cotton rolls
NO BWs
What are the 4 occlusal projections?
Topographical MX - Examine palate and anterior teeth Lateral MX - Examine palatal roots of molars, locate foreign bodies in posterior maxilla Anterior MD - Examine anterior teeth of MD Topographical MD - Examine B and L aspects of MD, locate foreign bodies/salivary stones in floor of mouth
What could cause a tooth to have a wide PDL space?
Ortho treatment
What could cause “double lines” on a radiograph?
Curvature of root surfaces
The PDL Space should appear ____
Radiolucent
How do the trabecular spaces differ between the MX Anterior, MD Anterior and the MD Posterior?
MX Anterior: Fine trabecular plates, multiple small trabecular spaces
MD Anterior: Coarser trabecular plates, larger marrow spaces
MD Posterior: Sparse trabeculation, Large marrow spaces
Opening the contacts between MX Molars will require a more ____ angled cone
Mesially
What are Lateral Cephalometric Projections utilized for?
- Evaluating the relationship between various orofacial and dental structures
- Growth and development of the face
- Treatment progression
What are Posteroanterior Projections utilized for?
- Evaluation of facial symmetries
- Assessment of orthognathic surgery outcome
What are Waters Projections utilized for?
Evaluation of sinuses
What are Submentovertex Projections utilized for?
Evaluating the zygomatic arch
What are Reverse-Towne Projections utilized for?
Evaluate condyle and condylar neck fractures
Panoramic Advantages include:
- Broad coverages of facial bones and teeth
- Low radiation dose (9-24 vs 17-388 microSv)
- Quick and convenient radiographic technique
- Useful visual aid in patient education and case presentation
- Can be used in patient with trismus or in patients who cannot tolerate intraoral radiography
Panoramic Disadvantages include:
- Do not provide the fine details provided by intraoral radiographs
- Unequal magnification across image, making linear measurements
unreliable - Requires accurate patient positioning to avoid positioning errors and artifacts
- Requires careful visualization due to superimposition of real, double, and ghost images
Image distortion of Panoramic radiographs is dependent on:
- X-ray beam angulation
- X-ray source to object distance
- Path of rotational center
- Position of the object within the focal trough.
Horizontal magnification is determined by ____
The position of the object within the focal trough
If an object is BUCCAL to the focal trough, it will be horizontally ____
Compressed
If an object is LINGUAL to the focal trough, it will be horizontally ____
Magnified
An X-Ray with a negative beam angulation will place objects closer to the source, ____ on the projection
Higher
