Modified Law method and Schuller method. for TMJ Flashcards
axiolateral oblique ( modified law) and axiolateral( schuller method)
What are the clinical indications for the Modified Law Method?
Abnormal relationship or range of motion between condyle and TM fossa.
Generally, images are obtained in the open mouth and closed mouth positions.
What is the patient position for the Modified Law Method?
- The patient should be erect or semiprone (erect is preferred if the patient’s condition allows), with the lateral aspect of the head against the table/upright imaging device surface, with the side of interest closest to the IR.
What is the central ray (CR) alignment for the Modified Law Method?
- Angle CR 15° caudad, centered to 1.5 inches (4 cm) superior to the upside EAM (to pass through the downside TMJ). Center IR to projected CR.
How should the part be positioned for the Modified Law Method?
- Prevent tilt by maintaining IPL perpendicular to IR.
- MSP is parallel to IR to start.
- Align IOML perpendicular to the front edge of the IR.
- From a lateral position, rotate the face toward the IR 15° (with MSP of the head rotated 15° from the plane of IR).
What are the clinical indications for the Schuller Method?
Abnormal relationship or range of motion between condyle and TM fossa.
Generally, images are obtained in the open mouth and closed mouth positions.
Q: What are the technical factors for the Schuller Method? A:
Minimum SID: 40 inches (102 cm)
IR size: 18 × 24 cm (8 × 10 inches), lengthwise
Grid
Analog: 70 to 80 kV range
Digital systems: 75 to 85 kV range
AEC not recommended
How should shielding be applied in the Schuller Method?
Shield radiosensitive tissues outside the region of interest.
How should the part be positioned for the Schuller Method?
Adjust the head into a true lateral position and move the patient’s body in an oblique direction for comfort.
Align IPL perpendicular to IR.
Align MSP parallel with the table/imaging device surface.
Position IOML perpendicular to the front edge of IR.
What is the central ray (CR) alignment for the Schuller Method?
Angle CR 25° to 30° caudad, centered to 0.5 inches (1.3 cm) anterior and 2 inches (5 cm) superior to the upside EAM. Center IR to the projected TMJ.
What is a notable difference between the Schuller Method and the Modified Law Method?
The Schuller Method results in greater elongation of the condyle compared with the Modified Law Method.