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 (ə-klo͞o′zəl, -səl)
Of or relating to occlusions of the teeth, especially the chewing or biting surfaces: occlusal wear.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(əˈklu səl, -zəl)
1. pertaining to the occlusion of the teeth.
2. designating or pertaining to the surface of a tooth that meets the surface of an opposing tooth in occlusion.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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[20] Laskin (1969) reported that the etiological factor that cause of temporomandibular joint disorder is muscular hyperactivity induced by abnormal contraction and relaxation of various masticatory muscles, psychological stress and parafunctional oral habits, that may lead to muscular fatigue, causes spasm, and restricted jaw movements resulting in temporomandibular joint dysfunction, further noted that this disorder may cause occlusal disharmony, deformation in articulation leading to alteration in muscular activity.
The present study found that need partial denture patients can also suffer from debonded or fractured artificial teeth that might be due to an occlusal disharmony with the presence of a wrong centric relation occlusion.