Bruxism is the most common form of maxillofacial hyperkinesia. Behavioral disorders as well as affective psychological factors, depression and anxiety being one of the most prominent factors, can together with emotional stress, induce bruxism. There has been the correlation between medications and bruxism (for example SSRI's).

We reported a case of a 47-year-old female patient who has been psychiatrically treated for depression since 1988 (F 32.1 by ICD 10). In 2005, she was hospitalised for the second time, this time for depression with psychotic traits (F 33.3 by ICD 10) due to which she was also hospitalised in 2006 and 2007. During 2005 and 2006 she was taking mirtazapine, paroxetine as well as olanzapine and since 2007 she has been taking sertraline and olanzapine.

There was an excessive wear of tooth surfaces and edges due to bruxism on seven-year-old bridge, which she noticed herself two years ago. She was awake during the diurnal bruxism and nocturnal bruxist activity was confirmed by her husband. Michigan splint was fabricated, thus alleviating the destructive impact of masticatory forces on the teeth and their supportive tissues.

Bruxism, associated with medications or mental disorders and very detrimental to teeth, the periodontium and oral health in psychiatric patients should be also treated as a general health problem and oral health problem. The prognosis for stopping bruxist activity is bad because a complete prosthodontic treatment was extremely limited due to the patient's psychiatric condition.