Observations on the main occluding area in mastication.

Kato, Hitoshi; Furuki, Yuzuru; Hasegawa, Shigeo

doi:10.7144/sgf.2.119

Cited by 21 publications

(31 citation statements)

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“…In the present study, the coincidence in all three trials was over 80% in all groups and higher than that in the report by Kato et al 6 This high coincidence suggests that our experimental method is reliable and reproducible even though we examined just three trials. In addition, the high coincidence in the patients with mandibular prognathism as compared to the subjects with normal occlusion indicates that the concept of the main occluding area exists in patients with mandibular prognathism.…”

Section: Discussioncontrasting

confidence: 47%

“…Kato et al 6 had reported that the main occluding area in normal occlusion was located on the maxillary and mandibular first molars in most subjects, and concluded that the maximal biting force might be exerted in the first molar region. Nakata et al 7 reported the change of the main occluding area with dental age.…”

Section: Discussionmentioning

confidence: 99%

“…As for the coincidence of the main occluding area, Kato et al 6 reported that the percentage of the subjects who showed the coincidence in five trials was 67%. In the present study, the coincidence in all three trials was over 80% in all groups and higher than that in the report by Kato et al 6 This high coincidence suggests that our experimental method is reliable and reproducible even though we examined just three trials.…”

Section: Discussionmentioning

confidence: 99%

“…The main occluding area was identified in accordance with the method of Kato et al 6 Briefly, one piece of dental stopping was placed on the center of the dorsal surface of the tongue in each subject as test food, and the subject was instructed to clench it once on the particular occluding area that was preferably used during mastication ( Figure 2). The subjects were trained to clench dental stopping several times on the left and right side respectively.…”

Section: Identification Of the Main Occluding Areamentioning

confidence: 99%

“…Kato et al 6 first described an occlusal area where hard foods are initially crushed in the early step of mastication and named the area, the "main occluding area." He found that the main occluding area plays an important role in the initial step of mastication, and is usually located on the maxillary and mandibular first molars in most of the subjects.…”

Section: Introductionmentioning

confidence: 99%

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The main occluding area in normal occlusion and mandibular prognathism

Kanzaki

Tokiwa

et al. 2015

The Angle Orthodontist

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Objective: To clarify whether the concept of main occluding area, where hard food is initially crushed, exists in patients who have a jaw deformity. Materials and Methods: Nineteen subjects with normal occlusion, 18 patients with mandibular prognathism, and 11 patients with mandibular prognathism who had undergone orthognathic surgery participated in this study. The main occluding area was identified by clenching Temporary Stopping. The coincidence, location of the main occluding area, and distance from the first molars to main occluding area were examined. Results: High coincidence of the main occluding area was obtained in all groups, signifying that the main occluding area exists even in these patients. Mandibular main occluding area was located on the first molar in all groups. Maxillary main occluding area in subjects with normal occlusion was located on the first molar. However, it was located on the second premolar and first molar in patients with mandibular prognathism, and on the first and second molars in patients with mandibular prognathism who had undergone orthognathic surgery. There was a statistically significant difference in distance from the maxillary first molar to the main occluding area among groups, but there was no difference in the distance from the mandibular first molar among groups. Conclusion: The main occluding area is more stable on the mandibular first molar than the maxilla in all groups. (Angle Orthod. 2016;86:87-93.)

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Section: Discussioncontrasting

confidence: 47%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Identification Of the Main Occluding Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The main occluding area in normal occlusion and mandibular prognathism

Kanzaki

Tokiwa

et al. 2015

The Angle Orthodontist

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Effects of diet and age–sex class on the fecal particle size of wild Japanese macaques (Macaca fuscata yakui)

Lee

Hanya

2021

American J Primatol

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Fecal particle size provides important information on the feeding and digestion of herbivores. Understanding the effects of the potential proximate determinants on fecal particle size helps us interpret this widely used measurement. In folivores, previous studies found that diet composition, dietary toughness, and age-sex-related factors, such as body size and tooth wear, influenced fecal particle size. However, the role of these factors remains unknown in frugivorous and omnivorous primates. This study aims to clarify how age-sex class and diet influence fecal particle size in omnivorous Japanese macaques in Yakushima. We expected that their variable diet and differences among age-sex classes would cause variations in fecal particle size. We simultaneously documented Japanese macaques' diet, dietary toughness, and fecal particle size in the lowland area of Yakushima in the period from March 2018 to April 2019.Unexpectedly, fecal particle size showed limited differences across months and no difference among age-sex classes. Dietary toughness showed no effects on fecal particle size, while the consumption of fruits showed only a marginally significant negative effect. Our data indicate that the results of chewing were not affected by dietary toughness in our study subjects, while age-sex classes showed no difference in food comminution. This lack of variation might derive from a diet with low dietary toughness. We also found that the physical structure of preferred foods played an important role in fecal particle size variations. These results suggest that food comminution is less variable in frugivorous and omnivorous primates compared to highly specialized species (e.g., geladas). Factors other than what we examined in this study, such as food physical structure and chewing behavior, should also be taken into consideration.

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