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The relative movements of the chin and the mandible during chewing
Author(s) -
JEMT TORSTEN,
HEDEGÅRD BJORN
Publication year - 1982
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1982.tb01015.x
Subject(s) - chin , mandible (arthropod mouthpart) , displacement (psychology) , orthodontics , dentistry , medicine , anatomy , biology , psychology , genus , botany , psychotherapist
Summary The suitability of the soft tissue over the chin as a reference point in studies of mandibular performance during chewing was investigated. The movements of reference diodes (LEDs), one on the chin and the other attached to a lower front tooth, were registered simultaneously using the Selspot system and analysed in relation to the reference system in this method. With respect to chewing rhythm, the conformity of the behaviour of the two diodes‐or the two tissue locations‐was good, thus allowing the conclusion that a chin reference point is suitable for analysing chewing rhythm. Vertical displacement and velocity were less marked with the chin reference than with the tooth reference, however, indicating that the skeletal part of the mandible moves within the tissues envelope. The difference in movement at maximal opening was significant, the magnitude of the difference being between 12 and 20%. Lateral displacement seemed to be of similar magnitude, although a tendency towards larger movements of the chin point than of the tooth was found.