Maximum Occlusal Force and Physical Performance in the Oldest Old: The Tokyo Oldest Old Survey on Total Health

Iinuma, Toshimitsu; Arai, Yasumichi; Fukumoto, Michikazu; Takayama, M.; Abe, Yukiko; Asakura, Keiko; Nishiwaki, Yuji; Takebayashi, Toru; Igarashi, Takashi; Komiyama, Kanki; Gionhaku, Nobuhito; Hirose, Nobuyoshi

doi:10.1111/j.1532-5415.2011.03780.x

Cited by 105 publications

(132 citation statements)

References 40 publications

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“…2b and c) seen between younger and middle groups compared to differences between middle and older groups is indicative of a general mineralization process throughout cementum, and is likely regulated through a network of mechanically sensitive cementocytes [60]. The change in mineral content with age can be described as an adaptation to decreased load rates coupled with metabolic activity of cells since older individuals present decreased muscle size and strength compared with younger individuals [23, 61]. Additionally, the effect of functional loads is seen most between the younger and middle age groups.…”

Section: Discussionmentioning

confidence: 99%

“…Modulation of physicochemical properties can occur based on the classic tenet that with an increase in age the magnitude of forces on mechanosensitive tissues decrease due to an increase in muscle atrophy [19–26]. Studies specific to the bone-tooth organ have shown an inverse relationship between age and masticatory force, citing decreasing strength of the main masticatory muscles (temporalis, masseter, and medial pterygoid) and muscular atrophy that accompany aging process [23, 27]. It continues to be a challenge to seamlessly tie the cause and effect relationship within the context of functional loads and resulting tissue properties.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive properties of human cementum and cementum dentin junction with age

Jang

Lin

Choi

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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Objectives The objective of this study was to evaluate age related changes age related changes in physical (structure/mechanical properties) and chemical (elemental/inorganic mineral content) properties of cementum layers interfacing dentin. Methods Human mandibular molars (N=43) were collected and sorted by age (younger = 19–39, middle = 40–60, older = 61–81 years). The structures of primary and secondary cementum (PC, SC) types were evaluated using light and atomic force microscopy (AFM) techniques. Chemical composition of cementum layers were characterized through gravimetric analysis by estimating ash weight and concentrations of Ca, Mn, and Zn trace elements in the analytes through inductively coupled plasma mass spectroscopy. The hardness of PC and SC was determined using microindentation and site-specific reduced elastic modulus properties were determined using nanoindentation techniques. Results PC contained fibrous, 1–3 µm wide hygroscopic radial PDL-inserts. SC illustrated PC-like structure adjacent to a multilayered architecture composing of regions that contained mineral dominant lamellae. The width of cementum dentin junction (CDJ) decreased as measured from cementum enamel junction (CEJ) to the tooth apex (49–21µm), and significantly decreased with age (44–23µm; p<0.05). The inorganic ratio defined as the ratio of post-burn to pre-burn increased with age within primary cementum (PC) and secondary cementum (SC). Cementum showed an increase in hardness with age (PC (0.40–0.46GPa), SC (0.37–0.43GPa)), while dentin showed a decreasing trend (coronal dentin (0.70–0.72GPa); apical dentin (0.63 – 0.73 GPa)). Significance The observed physicochemical changes are indicative of an increased mineralization of cementum and CDJ over time. Changes in tissue properties of the teeth can alter overall tooth biomechanics, and in turn the entire bone-tooth complex including the periodontal ligament. This study provides baseline information about the changes in physicochemical properties of cementum with age, which can be identified as adaptive in nature.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive properties of human cementum and cementum dentin junction with age

Jang

Lin

Choi

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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“…Iinuma et al (2) reported that maximum bite force was significantly associated with age in males. However, another study (3) of bite force in young adults (age 20-29 years) and 10 senior citizens with 28 teeth found no difference between the older and younger groups in total bite force distribution.…”

Section: Introductionmentioning

confidence: 99%

Effect of age on bite force

Chong

Khoo²,

Goh

et al. 2016

Journal of Oral Science

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This study compared bite force in adults older than 60 years with that of young adults. The participants were 20 healthy adults (9 men) older than 60 years (median age, 66 years) and 44 healthy young adults (22 men; age range, 18-25 years; median age, 22 years) at the International Medical University, Malaysia. All participants had at least 20 teeth, and bite force was measured and evaluated using the Dental Prescale system. Average (SD) bite force was 420.5 (242.0) N for the older adults and 541.4 (296.3) N for the young adults. Although mean bite force was higher for the young adults, the difference was not significant. These findings suggest that bite force is unaffected by age in adults with adequate dentition. (J Oral Sci 58, 361-363, 2016)

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“…12 Previous studies have found that physical fitness is significantly and positively correlated with bite force. 14,15 Because obese adolescents might have lower bite force, it is very important to understand how obesity influences the maximum bite force in this population. Moreover, the role gender difference plays in the association between obesity and bite force is less studied.…”

Section: Introductionmentioning

confidence: 99%