Modulation of the masticatory path at the mandibular first molar throughout the masticatory sequence of a hard gummy jelly in normal occlusion

Kitashima, Fumiaki; Tomonari, Hiroshi; Kuninori, Takaharu; Uehara, Sawako; Miyawaki, Shouichi

doi:10.1179/2151090314y.0000000020

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…In a previous study, Uesugi et al [20] reported that there was a significant correlation between the amount of mouth opening and masticatory function. Kitashima et al [21] reported that food properties are involved in the mandibular position when mouth opening is > 3.0 mm in the masticatory movement path of the mandibular first molars.…”

Section: Closing Angle During Masticatory Movementmentioning

confidence: 99%

A Study for Determining the Inclination of the Occlusal Plane from the Mandibular Functional Trajectory

Ikeda

Yamashita

2022

International Journal of Dentistry

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Background. During the fabrication of prostheses, the putative occlusal plane is generally determined based on morphological criteria such as Camper’s plane. There is a possibility that morphological indexes deviate from their original positions over time. The current study investigated whether functional indexes could be used to determine occlusal planes instead of morphological indexes. Objectives. The objectives of the present study were to investigate the relationship between the maxillary occlusal plane and mandibular functional trajectory and to consider a method for reconstructing a lost occlusal plane based on functional trajectories. Methods. Thirteen healthy dentulous individuals were recruited for the study. Using a jaw motion tracking device with 6-degrees of freedom, the trajectories of the mandibular first molar and incisor during masticatory movement or tapping movements were measured. Results. The closing angle of the mandibular first molar to the maxillary occlusal plane was converged and averaged 74.1° just below the intercuspal position, which is the terminal position of masticatory movement. This angle was positively correlated with the closing angle of the incisal point during tapping movement. The regression equation obtained was y = 0.37x + 45.99, where x was the closing angle of tapping movement and y was the closing angle of masticatory movement. Conclusions. It was suggested that when determining lost occlusal plane, the occlusal plane can be derived using the closing angle of the incisal point during tapping movement.

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Section: Closing Angle During Masticatory Movementmentioning

confidence: 99%

A Study for Determining the Inclination of the Occlusal Plane from the Mandibular Functional Trajectory

Ikeda

Yamashita

2022

International Journal of Dentistry

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“…They also cited Woda et al (2006) who found that in humans it is primarily jaw muscle activity, not jaw kinematics, that is related to food hardness. More recent experimental studies in humans, however, suggest that while muscular activity increases as a function of food hardness, so too does lateral jaw movement (Almotairy et al, 2021; Kitashima et al, 2015; Komino & Shiga, 2017). Thus, cusp flare may serve as a buttress against laterally‐directed forces during the crushing or grinding of hard foods.…”

Section: Aspects Of Crown Geometrymentioning

confidence: 99%

Molar form, enamel growth, and durophagy in Cercocebus and Lophocebus

Guatelli‐Steinberg

Schwartz

O'Hara

et al. 2022

American Journal of Biological Anthropology

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Objectives To test the hypothesis that differences in crown structure, enamel growth, and crown geometry in Cercocebus and Lophocebus molars covary with differences in the feeding strategies (habitual vs. fallback durophagy, respectively) of these two genera. Relative to Lophocebus molars, Cercocebus molars are predicted to possess features associated with greater fracture resistance and to differ in enamel growth parameters related to these features. Materials and Methods Sample proveniences are as follows: Cercocebus atys molars are from the Taï Forest, Ivory Coast; Lophocebus albigena molars are from a site north of Makoua, Republic of Congo; and a Lophocebus atterimus molar is from the Lomako Forest, Democratic Republic of Congo. For μCT scans on which aspects of molar form were measured, sample sizes ranged from 5 to 35 for Cercocebus and 3 to 12 for Lophocebus. A subsample of upper molars was physically sectioned to measure enamel growth variables. Results Partly as a function of their larger size, Cercocebus molars had significantly greater absolute crown strength (ACS) than Lophocebus molars, supporting the hypothesis. Greater crown heights in Cercocebus are achieved through faster enamel extension rates. Also supporting the hypothesis, molar flare and proportional occlusal basin enamel thickness were significantly greater in Cercocebus. Relative enamel thickness (RET), however, was significantly greater in Lophocebus. Discussion If ACS is a better predictor of fracture resistance than RET, then Cercocebus molars may be more fracture resistant than those of Lophocebus. Greater molar flare and proportional occlusal basin thickness might also afford Cercocebus molars greater fracture resistance.

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Electromyographic activity of superficial masseter and anterior temporal muscles during unilateral mastication of artificial test foods with different textures in healthy subjects

et al. 2019

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Modulation of the masticatory path at the mandibular first molar throughout the masticatory sequence of a hard gummy jelly in normal occlusion

Cited by 7 publications

References 41 publications

A Study for Determining the Inclination of the Occlusal Plane from the Mandibular Functional Trajectory

A Study for Determining the Inclination of the Occlusal Plane from the Mandibular Functional Trajectory

Molar form, enamel growth, and durophagy in Cercocebus and Lophocebus

Electromyographic activity of superficial masseter and anterior temporal muscles during unilateral mastication of artificial test foods with different textures in healthy subjects

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