| ObjectivesThe objective of this study was to explore the relationship between occlusal conditions and mental status and sleep bruxism.Sleep bruxism related questionnaires were used for preliminary diagnosis of bruxism;symptom check list-90(SCL-90)was used to assess the mental status;polysomnography was used for definite diagnosis of bruxism and assess rhythmic masticatory muscle activity(rhythmic masticatory muscle activity,RMMA);Teetester bite force analysis system was used to assess occlusal conditions.MethodsSleep bruxism volunteers were randomly recruited.All subjects accomplished SCL-90 scales,sleep bruxism related questionnaire,PSG and TeeTester one by one.SCL-90 was used to assess mental situation of volunteers,consisting of 90 different questions.Sleep bruxism related questionnaire was about the clinical symptoms of sleep bruxism.Polysomnography was monitored in Respiratory and Sleep Monitoring Center,Tianjin Medical University General Hospital.Electroencephalogram,electrocardiogram,electromyography,and blood oxygen saturation were recorded.TeeTester concentrated on 3 occlusal conditions,the cusp position,maximum left and right lateral occlusion position.Percentage of left and right force and single tooth force value at maximal bite force and maximum occlusal contact area,and occlusion time(OT)and disocclusion time(DT)were recorded.The analysis of the results was analyzed by SPSS 21.0.The independent samples T test was used to analyze RMMA.Single factor and multiple linear regressions were used to analyze the influence of mental state to sleep bruxism.Paired T test was used to analyze results of TeeTester.Tester P<0.05 was considered statistically significant.ResultsAs for sleep structures,the polysomnography showed that patients with sleep bruxism can have a normal sleep structure,but the arousal index of sleep bruxism patients was higher than that of normal control(26.26 ± 15.76,14.08 ± 6.24,P = 0.001).As for RMMA,there were 15.89 ± 4.23 RMMA episodes in normal subjects,while there were 41.23 ± 16.78 RMMA episodes in patients with sleep bruxism,it was nearly three times increased with statistic difference(P = 0.001).With respect to major sleep stage of bruxism,in spite of that RMMA can occur at all stages of sleep,but mainly occurred in stage N1(17.32 ± 7.13 episodes)and N2(15.65 ± 6.51 episodes),with significant statistic difference(P < 0.001).The results of SCL-90 scales showed that there were significant statistic differences between sleep bruxism patients and normal subjects in the scores of each factor.In addition,univariate linear regression results showed that obsessive-compulsive behavior,interpersonal sensitivity,depression,anxiety,paranoid ideation and psychoticism were associated with sleep bruxism(p <0.05).Multiple linear regression results showed that mental factor was associated with 69.9% of the onset of sleep bruxism.TeeTester analysis results showed that at the cusp position,at maximum occlusal contact area and maximum occlusal force values,the right occlusal force values were greater than left.At the left lateral occlusion position,the right bite force value was greater than left at maximum occlusal contact area,while the left bite force value was greater than right at maximum occlusal force values.At right lateral occlusion position,at maximum occlusal contact area and maximum occlusal force values,the right occlusal force values were greater than left.Besides we could found that the occlusal force of anterior area,premolar area and molar area were quite high.Most of OT and DT were abnormal,maximum of OT up to 4.68 s,and DT up to 8.31 s.ConclusionsPatients with sleep bruxism may had poor psychological status,and obsessive-compulsive behavior,interpersonal sensitivity,depression,anxiety,paranoid ideation and psychoticism are related to onset of sleep bruxism.the right occlusal force values were greater than left.And bite interference exists. |
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