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During translation opening of the mouth, how much additional distance is added to the maximum opening?

10-15 mm

15-20 mm

The additional distance added to the maximum opening of the mouth during translation is typically in the range of 15-20 mm. This phenomenon occurs as a result of the complex movements of the temporomandibular joint (TMJ) during the opening of the mouth. When the jaw opens, the mandible not only drops downward but also moves forward slightly, which is referred to as translation.

This translational movement complements the rotational movement that occurs within the joint during the initial phase of mouth opening. The measured increase in distance during this phase is important in clinical and dental contexts, particularly in understanding the range of motion available for various treatments, as well as in assessing normal versus pathological conditions in the TMJ.

Having a solid grasp of these anatomical and functional movements is crucial for dental professionals when planning interventions or evaluating a patient's mandibular mobility.

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20-25 mm

25-30 mm

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