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Human and macaque mastication: a quantitative study.

Significant differences exist between human and Macaca fascicularis patterns of mandibular movement during mastication. Macaque patterns display less asymmetry, more uniformity, and limited lateral excursions when compared to humans for mastication of the same food. Different anatomical structures between the two species offer explanations of the different patterns that were observed. Researchers should use caution when using macaques as models for human mastication.

Animals↗
PubMed1979

The absence of proprioceptive nerve endings in the human periodontal ligament: the role of periodontal mechanoreceptors in the reflex control of mastication.

A review of the literature was conducted to determine the presence or absence of proprioceptive nerve endings in the human periodontal ligament. A histologic review of the periodontal ligament innervation concluded that nerve endings found were those mediating pain, pressure, or touch and that there is no histologic evidence of any "classic" proprioceptive nerve ending in the periodontal ligament. A summary is given concerning the precise role of nerve endings in the periodontal membrane, their afferent pathways, and the role of masticatory muscle proprioception, jaw reflexes, and the temporomandibular joint in the coordinated control of mastication and mandibular proprioception.

Afferent Pathways↗
PubMed1977

Mastication and maturity: a longitudinal study in pigs.

The electromyography of mastication was studied longitudinally in miniature pigs, and the effects of age and food type were assessed. Within-individual variation was large relative to between-individual variation. Duration of chewing strokes increased with age and with more resistant foods. The results are compared with data on human beings and other animals.

Age Factors↗
PubMed1977

[Surgical treatment of old alveolar process fractures for the rehabilitation of mastication].

Surgical therapy of old fractures of the alveolar ridge is indicated if masticatory disturbances exist or are expected. Bony fragments of the alveolar ridge which carry teeth and are consolidated in dislocation are osteotomized, repositioned and fixed by dental splints for more than eight weeks. The guidelines for segmental and en bloc osteotomy in orthodontic surgery are applicable. Defects of the alveolar ridge are treated by vestibuloplasty or reconstructive surgery. It is also possible to combine the two methods. For the reconstruction of the alveolus, recently almost exclusively homologous transplants preserved in Cialit are used. Following reconstruction, additional vestibuloplasty may be carried out three months after the transplantation of bone or cartilage.

Alveolar Process↗