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Mandible and TMJ

Mandible and TMJ radiography

QuestionAnswer
The two main parts of the mandible are divided by the gonion (angle),
The two main parts of the mandible are the body and ramus
This extends along the entire superior portion of the body of the mandible where the lower teeth are rooted alveolar process
The flat angular area below the symphysis is called the mental point
The coronoid process is located anterior to the mandibular notch and is a site for muscle attachment
The posterior process of the upper ramus is the condyloid process which has a head and neck and fits into the temporomandubilar fossa of the temporal bone to form the TMJ
The Head of the condyloid process of the mandible is also called the condyle
The Head of the condyloid process of the mandible fits into the temporomandubilar fossa of the temporal bone to form the TMJ
What type of joint is the TMJ Synovial, Diarthrodial (freely moveable), ginglymus (hinge) and plane (gliding) type
For the Axiolateral Mandible projection what is the angulation to demonstrate the ramus 0 degrees rotation, MSP parallel
For the Axiolateral Mandible projection what is the angulation to demonstrate the body 30 degrees rotation toward IR, MSP 30 degrees
For the Axiolateral Mandible projection what is the angulation to demonstrate the symphysis 45 degree rotation, MSP 45 degrees
What is positioning for PA Mandible OML perpendicular, MSP perpendicular,center to exit the junction of the lips (for body),(optional PA Axial- 20-25 degree cephalad angle of tube, centered to exit the acanthion)
What is positoning for AP Axial Mandible (Towne) OML perpendicular CR 35 degrees caudad, or IOML perpendicular and CR 42 degrees caudad, MSP perpendicular, center to the glabella
What is demonstrated for AP Axial Mandible (Towne) condyloid processes demonstrated
What is positioning for SMV Mandible IOML parallel, MSP perpendicular, center midway between the angles of mandible (1 ½ "inferior to mandibular symphysis)
What is positioning for AP Axial TMJ (Modified Towne) OML perpendicular with 35 degree caudad CR or IOML perpendicular with 42 degree caudad angle, MSP perpendicular, center to exit 1" anterior to the level of TMJs (2" anterior to EAMs) (Hejny says level of TMJ)
What is demonstrated on AP Axial TMJ (Modified Towne) condyloid processes and TM fossa demonstrated
What is positioning for Axiolateral Oblique TMJ (Modified Law) IPL perpendicular (in a true lateral to start), rotate face toward image receptor 15 degrees (MSP 1 degrees from plane of IR),15 degree caudad angle, center 1 ½ "superior to the upside EAM, open and closed mouth
What is positioning for Axiolateral TMJ (Schuller) true lateral position, IPL perpendicular, MSP parallel, 25-30 degrees caudad angle, center ½ "anterior and 2" superior to upside EAM, open and closed mouth projections
What is positioning for TMJ Tomography upside TMJ, true lateral position, center ½ "anterior to EAM (TMJ clearly demonstrated)
The symphysis of the mandible is where the two sides of the mandible meet
Created by: StudyGroup
 

 



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