Calcification and Crystallization in Bovine Enamel

Tanaka, Sakae; Hirai, G

doi:10.1177/00220345820610011301

Cited by 17 publications

(18 citation statements)

References 7 publications

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“…However those studies suggest that most of the mineral content is added during the first substage of the secondary mineralization: completion of mineralization is slower but involves a smaller amount of the deposited mineral (Suga et al, 1970(Suga et al, , 1987Sakae & Hirai, 1982). That would mean that the contribution, to the total isotopic signal, of the isotopic composition of mineral deposited during the latest stages of the process is low.…”

Section: Significance and Implications Of Prolonged Enamel Mineralizamentioning

confidence: 99%

“…Histological investigations, including microradiography, autoradiography with 45 Ca, 32 P and 35 S, and tetracycline labelling performed on growing teeth of rat and other rodents (Hammarström, 1967;Bawden & Wennberg, 1977;Wennberg & Bawden, 1978;Suga, 1979;Suga et al, 1987), pig (Weinmann et al, 1942;Suga et al, 1970), sheep and goat (Suga, 1982) and cattle Sakae & Hirai, 1982) demonstrate that the enamel mineralization is a progressive and discontinuous process. The process is accomplished in at least two stages in which the mode and gradient of mineralization differ: (1) the stage of matrix formation, from the beginning to the completion of matrix secretion, in which initial mineralization occurs, and (2) the stage of maturation, from the completion of matrix formation to the completion of mineralization, in which a secondary mineralization occurs (Weinmann et al, 1942;Suga, 1982).…”

Section: Enamel Formationmentioning

confidence: 99%

“…This observation is consistent with the progressive process of mineralization over several months. Sakae & Hirai (1982) studied the rate of enamel mineralization in developing bovine incisors. In incisors with complete crown and primary formation of roots, enamel in the incisal tip showed only 52% mineralization and enamel in the cervical margin showed only 30% mineralization.…”

Section: Influence Of Introduction Of Dietary C 4 Components On δ 13 mentioning

confidence: 99%

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Reconstructing dietary and environmental history from enamel isotopic analysis: time resolution of intra‐tooth sequential sampling

Balasse

2002

Intl J of Osteoarchaeology

295

272

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The carbon and oxygen isotopic composition of the mineral phase of tooth enamel is linked to diet and environment. Enamel is not remodelled once formed. Several studies of intra-tooth isotopic variability in hypsodont mammal teeth have involved sequential sampling of enamel in order to detect changes in diet and environment during tooth formation. The possibility of exploring individual history opens the door to many applications, particularly in palaeoenvironment and herd management reconstruction. However, previous histological investigations have shown that enamel mineralization is a progressive and discontinuous process. The goal of the present study is to determine if this pattern significantly influences the time resolution of an intra-tooth sequential sampling. Isotopic analyses (δ 13 C) were performed on tooth enamel from steers (Bos taurus) that had changed from a C 3 plant-based diet to a C 4 plant-based diet with very different carbon isotopic compositions. The change of diet was reflected in the mineral phase of enamel. The pattern of intra-tooth isotopic variation suggests that completion of enamel mineralization required six to seven months. Such a lag in enamel mineralization will decrease the time resolution of enamel sequential sampling. The effects of prolonged mineralization of enamel have to be considered when interpreting patterns of intra-tooth isotopic variations.

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Section: Significance and Implications Of Prolonged Enamel Mineralizamentioning

confidence: 99%

Section: Enamel Formationmentioning

confidence: 99%

Section: Influence Of Introduction Of Dietary C 4 Components On δ 13 mentioning

confidence: 99%

See 1 more Smart Citation

Reconstructing dietary and environmental history from enamel isotopic analysis: time resolution of intra‐tooth sequential sampling

Balasse

2002

Intl J of Osteoarchaeology

295

272

View full text Add to dashboard Cite

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“…Histological studies performed on many different species have shown that enamel mineralization is a progressive and discontinuous process (Weinmann et al, 1942;Suga et al, 1970Suga et al, , 1987Suga, 1979Suga, , 1982Sakae & Hirai, 1982;Engel & Hilding, 1984;Moss-Salentijn et al, 1997). Deposition of the weakly mineralized organic matrix, which contains 10-20% of inorganic matter versus 80-90% in mature enamel (Moss-Salentijn et al, 1997), is only the first stage of the process.…”

Section: Mineralization Frontsmentioning

confidence: 99%

Potential biases in sampling design and interpretation of intra‐tooth isotope analysis

Balasse

2003

Intl J of Osteoarchaeology

139

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An increasing number of studies dealing with environmental and dietary reconstruction involve measurement of intra-tooth variation of isotope ratios. The sampling procedure typically consists of collecting a sequence of horizontal bands perpendicular to the growth axis of the tooth. The objective is to obtain a temporal sequence of the changes recorded in dental tissues during tooth development. This paper examines some issues associated with this sampling strategy and consequences for interpretation of the data. Time resolution is influenced by the pattern and duration of enamel mineralization, in a way that might, however, depend on the species and the tooth analysed. Although it may be impossible to sample discrete amounts of time, a chronological order seems to be respected, which should be well enough when the objective is to detect changes in isotope ratios with time. Absolute data must be interpreted with caution. Such issues do not affect studies of inter-individual variability as long as the sampling procedure applied to the compared specimens is consistent.A new sampling strategy is tested on modern goat teeth, involving drilling in an oblique direction. The results obtained from obliquely drilled samples are very similar to those obtained from the horizontal sampling procedure. More work is still needed to determine the value of alternative sampling strategies.

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“…Sakae and Hirai 23) showed the difference of the calcification and crystallization in the developing bovine enamel. The term calcification or mineralization means accumulation of the inorganic materials only whatever the state of materials, i.e.…”

Section: Discussionmentioning

confidence: 99%