In this study it is to be evaluated wether a restoration with composite resin fillings to reestablish a canine guidance will reduce masticatory muscle activity in patients with bruxism.

30 patients showing clinical symptoms of bruxism receive treatment within this clinical trial. Typical symptoms like pain or tenseness of the masticatory muscles, headache or abrasions are mandatory preconditions. Exclusion criteria are a present treatment with a biteguard or a sufficient canine guidance.

In the first session a detailed history, a dental status and a clinical functional status are recorded. The baseline situation is documented by taking impressions with alginate of the maxilla and mandible for diagnostic study models. Following this procedure a first measurement of the muscular activity is conducted for seven days with the Grindcare device.

After four weeks without any intervention a second measurement is conducted again for seven days.

In the next session the canine cusps are restored with composite fillings. Finally a sufficient canine guidance should be present. In the same session a second impression of the maxilla is taken. A third measurement is conducted, again followed by four weeks without any intervention.

At last another impression of the maxilla is obtained and a final measurement for seven days is conducted.

At the first examination and after the third measurement of the masticatory muscle activity the patients fill out the questionnaire of the Oral Health Impact Profile in order to allow for the assessment of possible functional restraints and mental interferences.

Inclusion Criteria:

• patients show signs of bruxism
• no canine guidance is present
• no prosthodontic restorations of the canine are present

Exclusion Criteria:

• a sufficient canine guidance is present