Читать книгу Temporomandibular Disorders - Robin J. M. Gray - Страница 62

Examination of the range of movement involves examining the interincisal opening, both pain‐free and maximum (Figure 3.1) and lateral excursions of the mandible.

Figure 3.1 Measurement of incisal opening.

(M. Ziad Al‐Ani, Robin J.M. Gray.)

The lower limit of normal range of incisal opening is regarded as being approximately 35 mm for female patients and 42 mm for male patients. The opening is usually measured from incisal tip to incisal tip. It does not matter whether or not the overbite is included in your measurement regimen as long as you are always consistent in either including the overbite or excluding it so that your measurements are comparable and reproducible.

The range of lateral mandibular excursions (lower limit 8 mm on either side) should be measured from upper incisal midline to lower midline, with the patient moving the mandible first to one side then to the other (Figure 3.2).

Figure 3.2 Measurement of lateral jaw movement.

(M. Ziad Al‐Ani, Robin J.M. Gray.)

Any starting discrepancy in the incisal midlines when the patient is in centric occlusion should be taken into account.