They may actually hold their mouth open, letting the mandible retrude, causing them to bite behind the elbow. Elbow vertical leg too short. Elbow vertical leg correct. In-out width discrepancies between the upper and lower crowns can be adjusted by placing a horizontal bayonet bend in the horizontal elbow leg to either widen or narrow the position of the vertical leg relative to the lower crown. Upper molar too wide, hard for elbow to engage lower arm.
Bayonet bend into horizontal leg to make vertical leg narrower.
Vertical leg torqued inward now engages lower arm in spite of excess upper molar width. Torquing vertical leg inward. The distal slant of the elbow's vertical leg can be varied to correctly engage the lower arm by placing up-down bends in the horizontal leg. Be careful not to allow the lower mandibular arm to bite above the horizontal leg or the patient will lock. A patient may lock up the MARA by slipping the lower arm into the opening of the upper elbow' s interior lumen space.