Enamel extension rate patterns in modern human teeth: Two approaches designed to establish an integrated comparative context for fossil primates

Guatelli‐Steinberg, Debbie; Floyd, Bruce; Dean, MC; Reid, DJ

doi:10.1016/j.jhevol.2012.05.006

Cited by 60 publications

(85 citation statements)

References 35 publications

(70 reference statements)

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“…One accepted view is that closely spaced perikymata intervals (growth lines) indicate a slower rate of growth, while more widely spaced perikymata point to faster growth [5]. We, therefore, conclude that our data support the view that ancient teeth grew faster than teeth of modern humans.…”

Section: Discussionsupporting

confidence: 82%

Tooth Growth in Ancient and Modern Times Inferred from Perikymata Growth Intervals; Modeled Statistically

Qualls¹,

Costa²,

Paffett³

et al. 2017

J Biom Biostat

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Tooth growth is essential to health and survival. In humans the growth rate can be inferred from the width of perikymata growth intervals. We hypothesized that in ancient times teeth grew faster than in modern humans. We measured the intervals between perikymata ridges on the surfaces of teeth and in thin sections of molars (which we used as standards) in ancient, prehistoric and modern humans. We compared statistically the results from ancient and modern specimens and assessed the impact of dietary factors and sociality on tooth growth. We found that ancient teeth grew faster than modern teeth (wider intervals) because of environmental, nutritional and life style influences. This apparently conferred evolutionary advantages for human survival. Our results gleaned from combining measurements of sections of teeth with modeling of web-available images suggest that life styles of modern humans have lead to smaller teeth.

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Section: Discussionsupporting

confidence: 82%

Tooth Growth in Ancient and Modern Times Inferred from Perikymata Growth Intervals; Modeled Statistically

Qualls¹,

Costa²,

Paffett³

et al. 2017

J Biom Biostat

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“…The distribution of perikymata on the enamel surface is correlated with the pattern of change of the enamel extension rate (EER) along the crown height (Guatelli-Steinberg et al, 2012). Moreover, the decline of the EERs in the most cervical portion of the tooth is associated with an increase in perikymata density.…”

Section: Methodsmentioning

confidence: 99%

Perikymata numbers and enamel extension rates in the incisors of three archaeological modern human populations from two caves located in Spain: Maltravieso Cave (Cáceres) and Mirador Cave (Burgos)

Modesto‐Mata

Dean²,

Castro

et al. 2017

Quaternary International

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“…Following methods described previously (Dean, 2009(Dean, , 2010Guatelli-Steinberg et al, 2012), a measurement of 200 m along a prism length (51 days formation time) was made from the EDJ tip in the cusp at the dentine horn. From this point an accentuated marking, or stria of Retzius, was identified and tracked obliquely back to intersect the EDJ further along from the dentine horn.…”

Section: Crown Formation Timesmentioning

confidence: 99%

“…High extension rates in the first-formed cuspal enamel play a large role in determining final cusp height and tooth height (Dean, 2009;Guatelli-Steinberg et al, 2012). Thereafter, a combination of extension rates and time spent forming enamel contribute to final crown height.…”

Section: Crown Heights Enamel Thickness and Enamel Formationmentioning

confidence: 99%

Enamel thickness and enamel growth in Oreopithecus: Combining microtomographic and histological evidence

Zanolli

Dean

Rook

et al. 2016

Comptes Rendus Palevol

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a b s t r a c tOreopithecus bambolii, a large-bodied fossil ape, lived in the Tusco-Sardinian archipelago during the Late Miocene, until ca. 6.7 Ma. Its dentition, an apparent blend of hominoid and cercopithecoid-like features, has been a matter of discussion since its first description, in 1872. While the height and sharpness of its molar cusps recall some Cercopithecidae, Oreopithecus is currently considered by many as more likely related to dryopithecines. Here, we use microtomographic-based quantitative imaging and histological evidence to link outer and inner tooth structural morphology with enamel development in Oreopithecus permanent teeth. The material consists of 14 teeth/crowns from the sites of Baccinello and Casteani, in Tuscany, and Fiume Santo, in Sardinia. In particular, we add to the record of 2-3D of molar enamel thickness topographic variation and enamel-dentine junction morphology, and using high-resolution replicas of the outer crown and ground sections, comparatively assess molar growth trajectory (crown formation times and enamel extension rates). Our results shed new light on dental development of this "enigmatic anthropoid" and provide additional evidence concerning the still debated question of its evolutionary history.

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Enamel extension rate patterns in modern human teeth: Two approaches designed to establish an integrated comparative context for fossil primates

Cited by 60 publications

References 35 publications

Tooth Growth in Ancient and Modern Times Inferred from Perikymata Growth Intervals; Modeled Statistically

Tooth Growth in Ancient and Modern Times Inferred from Perikymata Growth Intervals; Modeled Statistically

Perikymata numbers and enamel extension rates in the incisors of three archaeological modern human populations from two caves located in Spain: Maltravieso Cave (Cáceres) and Mirador Cave (Burgos)

Enamel thickness and enamel growth in Oreopithecus: Combining microtomographic and histological evidence

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