Experiments on the rat incisor into the cellular proliferation and blood-pressure theories of tooth eruption

Main, J. H. P.; Adams, Daniel L.

doi:10.1016/0003-9969(66)90185-3

Cited by 43 publications

(15 citation statements)

References 20 publications

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“…Small amounts of cobalt administered to rats induce polycythemia and a decrease in the impeded eruption rate (Bryer, 1957). Polycythemia, which in turn increases the viscosity of blood, probably reduces the circulation rate and the tissue oxygen tension within the pulp, a factor which appears to be important in the eruptive mechanism of the rat incisor (Bryer, 1957), although this interpretation has been questioned by Main and Adams (1966). In the present experiment, incisor eruption rate was depressed only in those animals exhibiting polycythemia, a finding which could apparently give support to the above hypothesis.…”

Section: Discussionsupporting

confidence: 45%

Impeded Eruption Rate of the Rat Maxillary Incisor During Exposure to Different Simulated Altitudes

et al. 1987

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Female rats weighing about 200 g each were separated into normoxic and hypoxic groups. The former were maintained at sea-level conditions. The hypoxic groups were placed in an altitude chamber and maintained at the equivalent of 1850 m, 4100 m, or 7100 m over a period of two weeks. Hematocrit, body weight, body length, and impeded eruption rate were recorded once a week. Food intake was recorded every day. Exposure to 1850 m did not significantly alter hematocrit, body weight and body length gains, food intake, and impeded eruption rate. Nevertheless, exposure to 4100 m and 7100 m decreased body weight and body length gains, food intake, and impeded eruption rate, and increased hematocrit value. These parameters varied as a function of altitude. In spite of the lack of conclusive evidence, this work affords further insight into the particular significance of polycythemia on the eruption rate.

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Section: Discussionsupporting

confidence: 45%

Impeded Eruption Rate of the Rat Maxillary Incisor During Exposure to Different Simulated Altitudes

et al. 1987

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“…The average daily unimpeded eruption rate for the naked mole-rats of approximately 645 mm are intermediate between estimates for the mouse (415 mm and 480 mm: Ness, 1965;Robins, 1980), the rat (approximately 1000 mm: Bryer, 1957;Main & Adams, 1966;Berkovitz & Thomas, 1969;BurnMurdoch, 1993), the guinea pig (530±850 mm: Berkovitz, 1974), and the rabbit (735 mm: Ness, 1956;950 mm: Moxham & Berkovitz, 1974). The unimpeded eruption rates recorded for the naked mole-rat are therefore unexceptional and within the range reported for other laboratory rodents and lagomorphs.…”

Section: Discussionmentioning

confidence: 91%

Eruption rates of the mandibular incisors of naked mole‐rats (Heterocephalus glaber)

Berkovitz

Faulkes

2001

Journal of Zoology

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Naked mole-rats Heterocephalus glaber are highly social hystricomorph rodents endemic to the arid regions of East Africa. Living entirely underground, they excavate an extensive system of tunnels with their continuously growing extra-buccal incisors. The majority of the burrow is composed of foraging tunnels, constructed in search of the underground roots and tubers that form their staple diet. Subterranean foraging imposes risks associated with not ®nding food, and a high energetic cost, and in addition could be limited by the rate of wear of the incisor teeth. The aim of this study was to determine eruption rates for mandibular incisors in naked mole-rats to investigate whether they showed evidence of faster eruption as an adaptation to their subterranean niche and mode of digging. Impeded eruption rates (when the teeth were left in normal occlusion) were initially determined over a period of 1 week in a group of 12 naked mole-rats kept in laboratory conditions. Unimpeded eruption rates were then monitored in the same animals by cutting one mandibular incisor free of occlusion thrice weekly, and measuring growth over a 2-week period. Mean daily impeded eruption rates were c. 228.7 17.5 mm, while mean daily unimpeded rates were higher at c. 624.7 10.4 mm. While impeded eruption rates under laboratory conditions may be an underestimate of the rates occurring in the wild, unimpeded rates (usually about twice the impeded rate) indicate the maximum potential eruption rates of the teeth and are independent of functional activity. These data are not dissimilar from those determined for laboratory rodents and lagomorphs suggesting that the naked mole-rat does not display unusual patterns of eruptive behaviour. Tooth wear resulting from their subterranean lifestyle may be offset as a limiting factor by the social behaviour of the naked mole-rat, where digging activity is distributed among a large workforce during favourable burrowing conditions.

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“…To ensure that the tooth remained unimpeded, it was trimmed to the gingival margin every 2 to 3 days with a carborundum disc. The tooth was cut to the gingival margin 2 days prior to the experimental period, as the occlusal plane of the adjacent impeded mandibular incisor falls during the first 48 h; thereafter it remains more or less constant [16]. The height of the adjacent impeded incisor from the incisal edge to the gingival margin was monitored throughout to assess its stability as a reference point.…”

Section: Methodsmentioning

confidence: 99%

The Effects of Aging on the Eruptive Behavior of the Mandibular Incisor in Male Rats

Moxham

2002

Connective Tissue Research

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Several studies have highlighted the lack of age changes in the extracellular matrix of the periodontal ligament, but more needs to be known about cellular and functional changes (including the effects upon eruption). For this study, impeded and unimpeded eruption rates were measured over a 2-week period for the mandibular incisors of a group of 24-month-old rats. The technique used for measuring eruption was similar to that described by Bryer [15]. Both impeded and unimpeded eruption rates were found to be significantly increased (p < .01) compared with those obtained from a group of rats aged 8 weeks. These changes might be related to changes in the mechanism(s) responsible for the generation of the eruptive force(s) or to changes in the resistance of the tissues to such forces.

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Experiments on the rat incisor into the cellular proliferation and blood-pressure theories of tooth eruption

Cited by 43 publications

References 20 publications

Impeded Eruption Rate of the Rat Maxillary Incisor During Exposure to Different Simulated Altitudes

Impeded Eruption Rate of the Rat Maxillary Incisor During Exposure to Different Simulated Altitudes

Eruption rates of the mandibular incisors of naked mole‐rats (Heterocephalus glaber)

The Effects of Aging on the Eruptive Behavior of the Mandibular Incisor in Male Rats

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