有的人在不咀嚼不吞咽时也在磨动牙齿或将牙齿咬紧,这种现象称为磨牙症,这是咀嚼系的一种异常功能运动。咀嚼系的正常功能——咀嚼、吞咽、说话等所引起的牙齿接触,时间短,用力也不大,对咀嚼系各部组织是一种生理性刺激。但磨牙症者上下牙齿接触的时间长,用力也大,对牙体、牙周、颞颌关节、咀嚼肌等组织均可引起损害,发生颞颌关节功能紊乱症、头痛、头面部肌痛。24小时内咀嚼和吞咽施于牙周之力的时间仅17.5分钟,其中一半以上是吞咽,而磨牙症者,持续地产生水平侧向力,几倍于正常功能。咀嚼时的验力一般为10—20公斤,而磨牙症所产生之力可达100公斤。磨牙症可分三型:磨牙型,常在夜间入睡之后磨动牙齿,为别人所听见而被告之,自己多半不知道,又称夜磨牙;紧咬型,常在白天注意力集中时不自觉地将牙咬紧,没有 Some people are grinding their teeth or biting their teeth without chewing or swallowing. This phenomenon is called bruxism, which is an abnormal functional exercise of the chewing system. The normal function of the chewing system - chewing, swallowing, talking, etc. caused by tooth contact, time is short, little effort, is a physiological stimulation of the Department of chewing Department of various organizations. However, bruxism teeth from top to bottom contact with a long time, the force is also large, on the teeth, periodontal, temporomandibular joint, masticatory muscle and other organizations can cause damage, the occurrence of temporomandibular joint dysfunction, headache, head and face myalgia. Within 24 hours of chewing and swallowing the periodontal force is only 17.5 minutes, of which more than half are swallowing, while bruxism, sustained horizontal horizontal force, several times normal function. The inspection force when chewing is generally 10-20 kg, while the power generated by bruxism up to 100 kg. Molar can be divided into three types: molars type, often at night after falling asleep grinding teeth, as others heard and accused, most of them do not know, also known as night molars; clenched type, often in the day when the concentration is not conscious The teeth will be clenched, no