Bilateral symmetry of denture, masseter muscle, TMJ and jaw movement.

咀嚼肌、颞下颌关节、下颌运动左右对称。

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Human skull is usually composed by 29 bones. Besides jaw, other bone between seam by bone connected, the only allowed the traces of the movement.

人类颅骨通常由29块骨头组成。除了下颌骨，其他骨头之间由骨缝连接，只允许微量的运动。

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Lower lip movement under the gums to do reveal like action then you can feel the neck muscle tension lack of strength when the lower jaw with your fingers Gently press skin to assist the movement.

运动下唇做显露下牙龈状动作此时可感到颈部肌肉的紧张力量不足时用手指轻压下颌皮肤协助运动。

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Also friction from eating and other jaw movement can cause the bone around the implant to wear away.

BBC: Researchers grow teeth from gum cells

Berdych combined much-improved movement with jaw-dropping forehands and lightning-quick deliveries to wow the Centre Court, and broke in game seven before serving out the opening set.

BBC: Wimbledon 2010: Roger Federer stunned by Tomas Berdych