Occlusal interference during mastication can cause pathological tooth mobility.
OBJECTIVE
Despite little evidence regarding the relationship between tooth mobility and nonworking contact, the evaluation of occlusion is performed mainly by the detection of premature and/or nonworking contacts during tapping movements and lateral excursion. The hypothesis of this study is that occlusal contact during mastication is potentially traumatic to periodontal tissue. It clarifies the relationship between chewing patterns and the status of periodontal tissue.


METHODS
Subjects included 73 adults, 20-29 years of age (39 men and 34 women), with complete sets of teeth and no history of orthodontic treatment or periodontal disease. The closing chewing patterns of each subject were classified into three groups by the Masticatory Deviation Index, which depicts the deviation from the normal chewing patterns within 5 mm from the intercuspal position. Periotest was used to diagnose teeth mobility and the values were compared among the three groups.


RESULTS
The present study indicates that the chewing movements which deviated from the normal chewing movements increased the mobility of specific types of teeth.


CONCLUSIONS
The results of this study imply a relationship between chewing movements and tooth mobility and indicate that functional evaluation of occlusion is necessary for the examination of periodontal tissue. Occlusal evaluation with border and tapping movements might be insufficient, and functional occlusal evaluation during chewing movements can be clinically useful for using to evaluate periodontal tissue.
Ishigaki
S
S
Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan. ishigaki@dent.osaka-u.ac.jp
Kurozumi
T
T
Morishige
E
E
Yatani
H
H