The study of grinding patterns and factors influencing the grinding areas during sleep bruxism.
OBJECTIVE
The purpose of this study is to investigate the grinding patterns and discuss the factors influencing the position relationship between intercuspal position (ICP) and grinding area during sleep bruxism.


METHODS
Lateral condylar inclination, inclination of lateral incisal path and freedom in long centric of thirty subjects were measured. The grinding patterns during sleep bruxism were recorded with a bruxism recording device, BruxChecker. The position relationship between ICP and the grinding area was examined. Spearman's rank correlation coefficient was used for correlation analysis between grinding area and free factors (grinding patterns, freedom in long centric and discrepancy between lateral condylar inclination and inclination of lateral incisal path).


RESULTS
All 12 subjects with 0mm-freedom in long centric exhibited that ICP of both sides located within the grinding areas. 4 subjects showed that ICP of both sides located outside the grinding areas. There is a significant correlation between 0mm-freedom in long centric and ICP within the grinding areas (p <0.01).


CONCLUSIONS
Freedom in long centric has a significant effect on position relationship between intercuspal position and the grinding area.
Department of Prosthodontics, Laboratory of Oral Biomedical Science and Translational Medicine, School of Stomatology, Tongji University, Shanghai, China. Electronic address: taojxtohoku@hotmail.com.
Jianxiang
J
Tao
Department of Prosthodontics, Laboratory of Oral Biomedical Science and Translational Medicine, School of Stomatology, Tongji University, Shanghai, China.
Weicai
W
Liu
Department of Prosthodontics, Laboratory of Oral Biomedical Science and Translational Medicine, School of Stomatology, Tongji University, Shanghai, China.
Junhua
J
Wu
Department of Prosthodontics, Laboratory of Oral Biomedical Science and Translational Medicine, School of Stomatology, Tongji University, Shanghai, China.
Xuying
X
Zhang
Department of Oral Radiology, Laboratory of Oral Biomedical Science and Translational Medicine, School of Stomatology, Tongji University, Shanghai, China.
Yongting
Y
Zhang
D000328:Adult; D003481:Cuspid / Q000473:pathology; D003768:Dental Occlusion, Centric; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008875:Middle Aged; D008963:Molar / Q000473:pathology; D020186:Sleep Bruxism / Q000503:physiopathology*; D055815:Young Adult
Grinding area; Grinding patterns; Long centric; Sleep bruxism