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14 Cards in this Set
- Front
- Back
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Describe the purpose and use of the bite-wing image
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a method used to examine the interproximal surfaces of teeth (contact point of teeth)
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Describe the appearance of opened and overlapped contact areas on a bite-wing image
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contact areas- where adjacent tooth surfaces meet
open contact areas-radiographically able to see b/w the teeth overlapped contacts-super imposed contact areas |
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State the basic principles of the bite-wing technique
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-Place receptor parallel to the crowns of both the maxillary and mandibular teeth
-receptor is stabilized when the patient bites on the BW or BW film holder -Central ray is directed thru the contacts of the teeth, using a 10 degree vertical angulation. gives an equal proportion in the image of the maxillary and mandibular -PID is centered over receptor |
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List the two ways a receptor can be stabilized in the bite-wing technique and identify which one is recommended for bite-wing exposures
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beam alignment device and bw tab
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List the three receptor sizes that can be used in the bite-wing technique and identify which size is recommended for exposures in the adult patient
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-size 0: for posterior teeth of children w/ primary dentition placed horizontally
-size 2: for the posterior teeth of children with mixed dentitions-placed horizontally -size 2: for posterior teeth of adults, placed vertically/horizontally |
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Describe correct and incorrect horizontal angulation
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Correct angulation:
-the center ray is directed perpendicular to the curvature of the arch and thru the contact areas of teeth Incorrect angulation -results in overlapped contact areas |
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Describe the difference between positive and negative vertical angulation
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Positive
-PID is positioned above the occlusal plane -Center ray is directed downward Negative -PID is positioned below the occlusal plane -Center ray is directed upward |
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State the recommended vertical angulation for all bite-wing exposures using a bite-wing tab
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+10 degrees, if less, results in a distorted image
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State the basic rules for the bite-wing technique
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Film Placement:
the receptor must cover prescibed area of interest Film Positions: the receptor must be positioned parallel to the crowns of max and man teeth and stabilized by the tab or the beam alignment Vertical angulation: must be directed at 10 degrees Horizontal angulation: center ray must be directed thru the contact areas b/w teeth for receptors using bite tabs Film exposure: x-ray beam must be centered over the receptor to ensure that all areas are exposed |
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Describe patient and equipment preparations that are necessary before using the bite-wing technique
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Patient Prep:
explain procedure; pt is positioned upright in chair; occlusal plane is parallel to floor and midsagittal plane (midline) is perpendicular to floor, remove eyeglasses and removable oral appliances; place lead apron, thyroid collar Equipment Prep: unit is on and exposure factors have been set; infection control protocol is demonstrated; film holder or BW tabs are on covered working surface |
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Discuss the exposure sequence for a complete mouth radiographic series (CMRS) that includes both periapical and bite-wing exposures
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-number of bw have been determined. -choose right or left side.
-follow sequence exposing premolar first then molar bw -if FMX, expose periapicals 1st and end w/ BW sequence |
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Describe the premolar and molar bite-wing receptor placements
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Sensitive side of receptor toward PID; identification dot is not significant w/ bw image (lower right is suggested); center film over area to be examined using the guideline requirements; ask pts to "slowly bite" on bite-tab
Premolar placement: Demonstrate at least 1/3 to 1/2 of the distal of mandibular canine, 1st premolar, 2nd premolar, 1st molar, and mesial portion of 2nd molar Molar placement- Demonstrate 1st, 2nd, 3rd molars. the 2nd molar is centered on the receptor |
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Describe the purpose and use of vertical bite-wing images
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-examine the level of aveolar bone - long portion of receptor in a vertical position
-7 images are taken for complete VBX -4 images if posterior only |
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List the size of receptor used in the vertical bite-wing technique
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-anterior VBW = size 1 receptor
-posterior VBW = size 2 receptor VBW placement: Molar: Center 2nd molar w/ emphasis of open contact b/w 1st and 2nd max molar Premolar: include distal 1/2 of canine, crowns of 1st and 2nd premolars, medial of 1st molar; emphasis of open contact b/w premolars and canine/premolar Canine: center canine w/ open contact emphasized b/w lateral incisor and canine incisor: center central incisors, lateral incisors in view, open contact emphasis b/w central incisors (at midline) Mods in BW techniquie: -endentulous spaces: a cotton roll must be placed in the area of the missing tooth to support the BW tab or receptor holder -Bony growths-The receptor must be placed b/w the tori and the tongue |
