TDA Online Continuing Dental Education

Exam for Determining the Sagittal Relationship Between Maxilla and Mandible - Exam 44

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Description: Establishing the sagittal jaw relationship is a key component to developing a diagnosis when treating an orthodontic patient. Several measurements, including the Wits Appraisal, ANB angle and nasion perpendicular have been and are currently used by practitioners to diagnose the sagittal jaw relationship. Unfortunately, all of these measurements have their limitations. The Cannon Analysis was created in an attempt to help overcome these limitations.

1. The major limitation(s) of Jacobsen’s Wits Appraisal is:

a. Inability of the measurement to tell us which jaw is discrepent
b. Difficulty in accurately constructing the Functional Occlusal Plane
c. Inability to tell us if we do have a jaw disharmony present
d. Both a and b
e. Both b and c

2. Harvold based his measurements off a point at the center of the condyle called:

a. Porion
b. TM point
c. Articulare
d. Condylion
e. Sella

3. Anatomic Porion is the superior point or margin of the:

a. Internal Auditory Meatus
b. Condyle
c. External Auditory Meatus
d. Ear Rod
e. Styloid Process

4. The Palatal Plane-Mandibular Plane Angle in determining the nature of a closed bite:

a. An angle of 25 degrees or above indicates a dental closed bite
b. An angle of less than 25 degrees indicates a skeletal closed bite
c. Both a and b above are correct
d. Both a and b above are incorrect

5. Which two measurements are included in the Cannon Analysis simply for comparison’s sake:

a. Wits Appraisal and ANB Angle
b. Wits Appraisal and MP-PP Angle
c. ANB Angle and Frankfort Mandibular Plane Angle
d. SN-MP Angle and ANB Angle
e. SNA Angle and ANB Angle