SEM observations of Retzius lines and prism cross-striations in human dental enamel after different acid etching regimes

Li, Chunfang; Risnes, Steinar

doi:10.1016/s0003-9969(03)00195-x

Cited by 30 publications

(32 citation statements)

References 22 publications

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“…Additional evidence for the daily nature of laminations comes from observations in the current study that cross‐striations and laminations may be seen in register with one another (Fig. 10), as also implied by Whittaker (1982), Risnes (1998) and Li & Risnes (2004). Despite this finding, laminations should not be used to determine the periodicity of Retzius lines.…”

Section: Incremental Featuressupporting

confidence: 74%

Experimental determination of the periodicity of incremental features in enamel

2006

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Vital labelling of hard tissues was used to examine the periodicity of features of dental enamel microstructure.Fluorescent labels were administered pre-and postnatally to developing macaques ( Macaca nemestrina ), which were identified histologically in dentine and related to accentuated lines in enamel, allowing for counts of features within known-period intervals. This study demonstrates that cross-striations represent a daily rhythm in enamel secretion, and suggests that intradian lines are the result of a similar 12-h rhythm. Retzius lines were found to have a regular periodicity within individual dentitions, and laminations appear to represent a daily rhythm that also shows 12-h subdivisions. The inclusion of intradian lines and laminations represents the first empirical evidence for their periodicities in primates; these features frequently complicate precise measurements of secretion rate and Retzius line periodicity, which are necessary for determination of crown formation time. The biological basis of incremental feature formation is not completely understood; long-period features may result from interactions between short-period rhythms, although this does not explain the known range of Retzius line periodicities within humans or among primates. Studies of the genetic, neurological and hormonal basis of incremental feature formation are needed to provide more insight into their physiological and structural basis.

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Section: Incremental Featuressupporting

confidence: 74%

Experimental determination of the periodicity of incremental features in enamel

2006

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“…For the HCl + silica group with the 7‐day in situ regimen, only the outer layers, 10 and 25 μ m, presented mean microhardness values that were statistically similar to the control group. These results indicate that the remineralizing process occurs first in the outer layers, possibly due to the topographic characteristics of this region, where Retzius lines have a regular frequency . It is likely that complete recovery of enamel, mainly for the deeper layers, would occur after a few days, as reported in several in situ studies with an experimental phase of 15 days, when cariogenic challenges were evaluated .…”

Section: Discussionsupporting

confidence: 65%

Tooth enamel properties and morphology after microabrasion: an in situ study

Pini

Lima

Sundfeld

et al. 2016

J of Invest & Clin Dent

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“…The altered activity of ameloblasts can change the orientation of enamel rods (Weber et al. ), decrease their dimension, or produce a ridge and underlying cleft (Risnes, ; Li & Risnes, ).…”

Section: Introductionmentioning

confidence: 99%

Biorhythms, deciduous enamel thickness, and primary bone growth: a test of the Havers‐Halberg Oscillation hypothesis

et al. 2016

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Across mammalian species, the periodicity with which enamel layers form (Retzius periodicity) in permanent teeth corresponds with average body mass and the pace of life history. According to the Havers-Halberg Oscillation hypothesis (HHO), Retzius periodicity (RP) is a manifestation of a biorhythm that is also expressed in lamellar bone. Potentially, these links provide a basis for investigating aspects of a species' biology from fossilized teeth. Here, we tested intra-specific predictions of this hypothesis on skeletal samples of human juveniles. We measured daily enamel growth increments to calculate RP in deciduous molars (n = 25). Correlations were sought between RP, molar average and relative enamel thickness (AET, RET), and the average amount of primary bone growth (n = 7) in humeri of age-matched juveniles. Results show a previously undescribed relationship between RP and enamel thickness. Reduced major axis regression reveals RP is significantly and positively correlated with AET and RET, and scales isometrically. The direction of the correlation was opposite to HHO predictions as currently understood for human adults. Juveniles with higher RPs and thicker enamel had increased primary bone formation, which suggests a coordinating biorhythm. However, the direction of the correspondence was, again, opposite to predictions. Next, we compared RP from deciduous molars with new data for permanent molars, and with previously published values. The lowermost RP of 4 and 5 days in deciduous enamel extends below the lowermost RP of 6 days in permanent enamel. A lowered range of RP values in deciduous enamel implies that the underlying biorhythm might change with age. Our results develop the intra-specific HHO hypothesis.

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SEM observations of Retzius lines and prism cross-striations in human dental enamel after different acid etching regimes

Cited by 30 publications

References 22 publications

Experimental determination of the periodicity of incremental features in enamel

Experimental determination of the periodicity of incremental features in enamel

Tooth enamel properties and morphology after microabrasion: an in situ study

Biorhythms, deciduous enamel thickness, and primary bone growth: a test of the Havers‐Halberg Oscillation hypothesis

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