G. NASAL BONES

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4 Terms

1
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<p>LATERAL PROJECTION</p>

LATERAL PROJECTION

can also be done with occlusal films
PP: semiprone; MSP & IOML parallel to IR; IPLE perpendicular to IR

RP: ¾ in. (old) or ½ in. (new) distal to nasion
CR: Perpendicular

SS: Nasal bones of side down & soft tissue structures

<p>can also be done with occlusal films<br>PP: semiprone; MSP &amp; IOML parallel to IR; IPLE perpendicular to IR</p><p><span>RP: ¾ in. (old) or ½ in. (new) distal to nasion</span><br><span>CR: Perpendicular</span></p><p><span>SS: Nasal bones of side down &amp; soft tissue structures</span></p>
2
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<p>TANGENTIAL PROJECTION</p>

TANGENTIAL PROJECTION

PP:
Extraoral Film (Cassette): prone; chin rested on sandbags; chin fully extended; MSP & GAL perpendicular to IR
Intraoral Film (Occlusal Film): supine; head elevated; MSP perpendicular to sponge; GAL parallel to sponge & perpendicular to film

RP: Glabelloalveolar line
CR: Perpendicular

SS: Nasal bones with minimal superimposition

ER: For demonstration of any medial or lateral displacement of fragments in fractures

Contraindications:
Children or adults who have very short nasal bones, concave face or protruding upper teeth

<p><span>PP:</span><br><span><em><u>Extraoral Film (Cassette)</u></em>: prone; chin rested on sandbags; chin fully extended; MSP &amp; GAL perpendicular to IR </span><br><span><em><u>Intraoral Film (Occlusal Film)</u></em>: supine; head elevated; MSP perpendicular to sponge; GAL parallel to sponge &amp; perpendicular to film</span></p><p><span>RP: Glabelloalveolar line</span><br><span>CR: Perpendicular</span></p><p><span>SS: Nasal bones with minimal superimposition</span></p><p><span>ER: For demonstration of any medial or lateral displacement of fragments in fractures</span></p><p><span>Contraindications:</span><br><span>Children or adults who have very short nasal bones, concave face or protruding upper teeth</span></p>
3
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<p>PARIETOACANTHIAL PROJECTION: WATERS METHOD</p>

PARIETOACANTHIAL PROJECTION: WATERS METHOD

PP: Prone; MSP & MML

perpendicular to IR; OML 37o to IR;

nose Âľ in. (1.9 cm) away from IR

RP: Acanthion (exit)

CR: Perpendicular

ER: Displacement of bony nasal

septum & depressed fx of nasal

wings

<p><span>PP: Prone; MSP &amp; MML</span></p><p><span>perpendicular to IR; OML 37o to IR;</span></p><p><span>nose Âľ in. (1.9 cm) away from IR</span></p><p><span>RP: Acanthion (exit)</span></p><p><span>CR: Perpendicular</span></p><p><span>ER: Displacement of bony nasal</span></p><p><span>septum &amp; depressed fx of nasal</span></p><p><span>wings</span></p>
4
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summary of projections of nasal bones

lateral projection, tangential projection, parietoacanthial projection waters method