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Facial bones Merrill

Facial bones

Question	Answer
Where is the CR centered for a lateral projection of the Facial Bones?	Perpendicular and entering the lateral surface of the zygomatic bone, halfway between the outer canthus and the EAM
Which line is Parallel to the transverse plane of the IR for a lateral projection of the Facial Bones?	IOML
What does the Lateral projection of the Facial Bones show?	All facial bones in their entirety with the zygomatic bone in the center
What other name does the Parietoacanthial Projection have?	Waters Method
Where is the CR directed for a Waters method?	Exits the Acanthion
What is the degree of angle the OML forms with the plane of the IR when doing a Waters view?	37 degrees
What line will be almost perpendicular to the plane of the IR when doing a Waters view?	MML
Which plane is perpendicular to the IR for a Waters view?	MSP
Where should the IR be centered for a Waters view?	Acanthion
What structures will be seen on a Waters projection of the Facial Bones?	Petrous ridges projected immediately below the Maxillary Sinuses, Maxillary Sinuses, Orbits, Zygomatic Arches and Maxilla
What part of the patients head will be placed on the IR for a Waters view?	Chin
When doing a Modified Waters, the OML is adjusted to form an angle of ______ degrees with the plane of the IR?	55
Where are the Petrous Ridges projected on a Modified Waters View?	Just below the inferior border of the Orbits, midway through the Maxillary Sinuses
What does the Modified Waters demonstrate better than the origional Waters?	Blow out fractures
What line is perpendicular to the IR for a Reverse Waters view?	MML
When is the Reverse Waters view done?	Trauma, or when the patient can not set up or turn over on their stomach
What is the degree of angulation of the CR for a Reverse Waters view?	0, Perpendicular
When would you angle the CR for a Reverse Waters view?	Trauma
Where does the CR exit on a Caldwell projection of the Facial Bones?	Nasion
What is the degree of angulation of the CR and in what direction for the Caldwell Facial Bones projection?	15 degrees, Caudad
On a Lateral projection of Nasal Bones, what line is parallel to the transverse plane of the IR?	IOML
What line is perpendicular to the plane of the IR for Lateral Nasal Bones?	IP
Where does the CR enter on a Lateral view of the Nasal Bones?	Perpendicular to the bridge of the nose and at a point 1/2 in distal to the Nasion
Why do both Laterals for Nasal Bones?	Comparasion
Where does the CR enter on an SMV projection of the Zygomatic Arches?	Perpendicular to the IOML and entering the MSP of the throat approx. 1 in posterior to the Outer Canthi
How do you position the patients head for an SMV of the Zygomatic Arches?	Hyperextend neck completely so that the IOML is nearly parallel to the IR; Vertex of skull is placed on IR
What structures will be shown on the SMV projection of the Zygomatic Arches?	Both Zygomatic Arches free of overlying structures; Symetric without foreshortening with no rotation
What types of film can be used to image the nasal bones?	Occlusal and Regular film
What projections of the Zygomatic Arches will demonstrate both arches on the same film?	AP Axial(modified townes) and SMV
What projection of the Zygomatic arches is similiar to the Tangential projection?	SMV
What line is parallel to the IR on a Tangential projection of the Zygomatic arches?	IOML
What degree is the MSP of the patients head rotated and in what direction, for the tangential projection?	15 degrees towards the affected side
What direction is the top of the patients head tilted and how many degrees, for the Tangential projection?	Away from the side being examined, 15 degrees
Where is the CR directed for the Tangential projection of the Zygomatic arches?	Perpendicular to the IOML and centered to the Zygomatic arch at a point approximately 1in posterior to the outer canthus
What is the main reason a Tangential projection is done for the Zygomatic arches?	Depressed fractures of the arch or flat cheekbones
When doing an AP Axial projection of the Zygomatic arches, what line is perpendicular to the IR?	OML
Where is the CR directed for a Modified Townes projection of the Zygomatic arches?	Glabella
What is the degree of angulation for the Zygomatic arches if the IOML is used and in what direction for the Townes method?	37 degrees, Caudad
What part of the patients face is touching the IR for a PA projection of the Mandibular Rami?	Nose and Forehead
What line will be perpendicular to the IR for a PA projection of the Rami?	OML
Where is the CR directed for a PA projection of the Rami?	Exit the Acanthion
What projection of the mandubilar rami is angled 20-25 degrees cephalad and exits the acanthion?	PA Axial projection of mandibular rami
In the PA Axial projection of the mandibular rami, what line is perpendicular to the IR?	OML
In the PA projection of the mandibular body, where is the CR directed?	Perpendicular to the level of the lips
What line is perpendicular to the IR on a PA mandibular body projection?	AML
On a PA Axial projection of the mandibular body, what is the degree of angle and in which direction does the CR enter?	30 degrees, cephalad
Where is the CR directed on the PA axial mandibular body projection?	Midway between the TMJ's
What line is perpendicular to the IR on the PA Axial mandibular body projection?	AML
On an Axiolateral oblique projection of the mandible,the head is in a _________ position and the _______ line is perpendicular to the IR.	Lateral, IP
What part of the mandible is parallel with the transverse axis of the IR on an Axiolateral Oblique?	The mandibular body
The CR is directed _____ degrees, __________ to pass through the mandibular region of interest on all mandibular axiolateral images.	25, cephalad
For an Axiolateral Oblique of the mandibulal ramus, the head is to be in what position?	True lateral
For an Axiolateral Oblique of the manbilular body, the head is in what position?	Laterally and rotated 30 degrees towards the IR
For an Axiolateral Oblique of the Mandibular symphysis, the head is in what position?	Laterally and rotated 45 degrees towards the IR
What projection of the mandible shows the neck the best?	Axiolateral Oblique
Where does the CR enter on an SMV projection of the mandible?	Centered between the angles of the mandible
On an AP Axial projection of the TMJ'S, what direction and to what degree is CR angled?	35 degrees, caudad
Where is the CR directed on an AP Axial projection of the TMJ's?	Midway between the TMJ's and 3 in above the nasion
What line is perpendicular to the IR on an AP Axial of the TMJ's?	OML
On an Axiolateral of the TMJ'S, the MSP is ________, and the IP is __________ to the IR.	Parallel, perpendicular
Where does the CR enter on an Axiolateral projection of the TMJ's?	1/2 in anterior to the EAM, and 2 in superior to the upside EAM
What position is the head in for the Axiolateral TMJ?	Lateral
In an Axiolateral Oblique of the TMJ's, the CR is directed in what direction and what angle?	Caudad, 15 degrees
The ______ is parallel with the transverse plane of the IR, on an Oblique TMJ.	AML
The MSP of the head is rotated _____ degrees towards the IR on the Oblique TMJ.	15
The CR is centered ____ in anterior to the EAM for the Oblique TMJ's.	1/2
The CR is directed _____degrees _______, exiting the TMJ closest to the IR and enters _____inches superior to the ______.	15, Caudad, 1 1/2, EAM
What projections of the mandibular rami will show medial or lateral displacement of fractures?	PA, PA Axial

Created by: radgirl37

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