PubMed · 56569
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J S Davison. 1976-04-03. Letter: Lower oesophageal sphincter relaxation is not a myth.. https://doi.org/10.1016/s0140-6736(76)93132-9
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A review of the literature on occlusal contacts emphasizes the following points. 1. Contacts in centric occlusion do not correspond to any ideal occlusal diagram. 2. Canine protection and group function appear to correspond to two successive states of the evolving dentition under the effect of abrasion. In most lateral occlusions, two maxillary teeth, of which one is the canine, are involved. 3. During mastication, tooth contacts exist. They occur most often during a sliding movement in which the direction and the origin are variable. This justifies the concept of an occlusal field of mastication. 4. During unilateral mastication, the chewing of the food is performed by working as well as nonworking contact. This imposes the distinction between the chewing and nonchewing sides (functional) and the working and nonworking sides (kinematic). 5. Centric occlusion is the occlusion most often used during mastication. It is also the occlusion for which the masticatory forces are the greatest. 6. The bibliographic data concerning occlusal contracts during swallowing are largely contradictory. It nevertheless seems that the occlusal contacts obey laws nearly the same as those governing the occlusal contact during mastication (sliding on an occlusal field of deglutition, and the importance of centric occlusion).
An experiment has been completed to investigate the strain levels obtained on polymethylmethacrylate dentures in function when biting and swallowing. The use of stacked, rosette strain gauges enabled the magnitude of strain in the material underlying the gauge to be calculated and, in addition, the direction of the principle maximum and minimum strain was also calculated. Strain in the denture base was measured in biting and swallowing with a normal occlusion, when the occlusal contact area was narrowed, and with the rosette gauges.