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Nonlever action of the mandible
Author(s) -
Taylor R. M. S.
Publication year - 1986
Publication title -
american journal of physical anthropology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.146
H-Index - 119
eISSN - 1096-8644
pISSN - 0002-9483
DOI - 10.1002/ajpa.1330700402
Subject(s) - lever , mandible (arthropod mouthpart) , stress (linguistics) , articulation (sociology) , condyle , orthodontics , action (physics) , function (biology) , anatomy , psychology , medicine , biology , philosophy , engineering , linguistics , physics , law , political science , mechanical engineering , botany , quantum mechanics , evolutionary biology , politics , genus
This study considers the current concept of the mandible as a lever of the third order. The concept requires a fulcrum, and this function has been ascribed to the condyle region, but it tends to be overlooked that the fulcrum of a third‐order lever in this case would sometimes have to bear a considerable stress. Certain changes, attributed to stress, have been observed in anatomical components of the articulation, but they cannot be explained in terms of the lever concept. They are accounted for by the changing anatomical relations in the working and contralateral sides during mandibular function. They arise from minor stress, especially when dental conditions indicate a period of abnormal function.