Updating histological data on crown initiation and crown completion ages in southern Africans

Reid, Donald J.; Guatelli‐Steinberg, Debbie

doi:10.1002/ajpa.23173

Cited by 12 publications

(17 citation statements)

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“…In this study, we present a set of distance‐based exponential regression equations derived from the more accurate, and increasingly used, developmental growth data published by Reid and Dean (, ), and Reid and Guatelli‐Steinberg (). We suggest that by using regression equations to estimate the age of defect formation based on its distance from the CEJ, it is possible to refine the objectivity of the existing decile‐chart approach, while offering more precise age estimates and improving the overall replicability of results.…”

Section: Current Methods For Estimating Chronologymentioning

confidence: 99%

“…In our study, we use previously published histological data of surgically extracted anterior teeth consisting of a northern European sample (n = 115) by Reid and Dean () and a southern African sample (n = 155) by Reid and Dean (); Reid and Guatelli‐Steinberg (). The data for the northern European sample (Table ) indicate the total amount of time required (in days/years) for each decile of crown height to form in each of the upper and lower anterior teeth.…”

Section: Methodsmentioning

confidence: 99%

“…In this case, because we are using growth data that place a limit on the ages at which cuspal enamel and full crown completion has occurred, we present age ( y ‐axis) as a function of distance from CEJ or crown height ( x ‐axis). For each model, the y‐intercept was constrained to the maximum age of crown completion for each tooth as per data in Reid and Dean (, ); Reid and Guatelli‐Steinberg (). Five models ( R = 5) were fitted to the data from each tooth type (upper central incisor, upper lateral incisor, upper canine, lower central incisor, lower lateral incisor, and lower canine).…”

Section: Methodsmentioning

confidence: 99%

“…Following the above method, a set of equations for the data from southern African sample by Reid and Dean () were also constructed, and can be seen in Table . For these, updated crown initiation times and crown completion ages published by Reid and Guatelli‐Steinberg () were used.…”

Section: Methodsmentioning

confidence: 99%

“…Both crown initiation times as well as crown completion times are taken from updated data in “Updating Histological Data on Crown Initiation and Crown Completion Ages in Southern Africans,” by Reid & Guatelli‐Steinberg, , American Journal of Physical Anthropology, 162, pp. 817–829.…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

New distance‐based exponential regression method and equations for estimating the chronology of linear enamel hypoplasia (LEH) defects on the anterior dentition

Henriquez

Oxenham

2018

American J Phys Anthropol

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Objectives We present a new distance‐based exponential regression approach based on published histological data to refine the objectivity, accuracy, and precision of age estimates of LEH defect formation on the anterior dentition. Methods Published histological data of anterior tooth crown growth for two samples (northern European and southern African) were fitted with exponential trendlines to construct exponential regression equations for each tooth type. A theoretical comparison of the age estimates produced by two commonly used methods (decile chart and linear regression), and those based on the exponential regression equations presented in this article were undertaken. Paired‐samples t‐tests were used to determine whether the estimates obtained by these methods differed significantly. Results Exponential regression equations were able to accurately replicate age estimates produced by the decile‐chart method. For defects that fell precisely on a decile, estimates differed by 1–23 days. Estimates based on the linear regression method were consistently younger by 4.5–16 months. For defects that fell within deciles, the exponential regression equation estimates, when different, were 12 days to 4 months older than those yielded by the decile method. Conclusions By combining currently published histological data on anterior tooth crown growth with a regression approach, it is possible to produce more accurate age estimates than yielded by methods that do not rely on histological data. Furthermore, this approach also greatly improves the objectivity, precision and replicability of results, especially for defects that fall between deciles, when compared to the decile chart method.

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Section: Current Methods For Estimating Chronologymentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

New distance‐based exponential regression method and equations for estimating the chronology of linear enamel hypoplasia (LEH) defects on the anterior dentition

Henriquez

Oxenham

2018

American J Phys Anthropol

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Incremental Structures in Teeth

Antoine¹,

FitzGerald²,

Rose³

2018

Biological Anthropology of the Human Skeleton

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Dental anthropology in the AJPA: Its roots and heights

Guatelli‐Steinberg¹

2018

American J Phys Anthropol

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K E Y W O R D S : dental development, dental morphology, dentition, teethThe roots of dental anthropology in the American Journal of Physical Anthropology (AJPA) go deep. Ale s Hrdlička published his classic comparative study "Shovel-Shaped Teeth" in the AJPA in 1920, just two years after founding the journal.Hrdlička's study on shovel-shaped teeth exemplified his overall vision of physical anthropology, as articulated in the AJPA's inaugural issue. Here, in a 23-page essay, he defined the field of physical anthropology and spelled out its "scope and aims" (Hrdlička, 1918). The field as a whole, he stated, could be defined ". . .in the briefest form as the study of man's variation" (italics his). In multiple places throughout his essay, Hrdlička emphasized that the primary aim of physical anthropology is to understand the "complete" "range of variation" of human anatomy and physiology.Hrdlička was unfortunately a product of his times in thinking about human variation in terms of races and in arranging them along a gradient from primitive to advanced. However, his more fundamental point clearly still stands: physical anthropology greatly enhances our understanding of human biology though its broad perspective on human variation. Hrdlička further explained that to understand the origins of modern human variation, physical anthropologists must trace its evolutionary history. Thus, he explained, a major aim of the field is to uncover that history by studying the living primates, filling in the paleontological record, and analyzing human skeletal remains from the recent past. "Shovel-Shaped Teeth" is a prime example of how Hrdlička employed this broad, comparative approach across space, time, and species, to understand human biological variation. In this paper, Hrdlička documented human variation in the shovel-shaped trait in human skeletal collections (700 teeth), living children of diverse ancestry (2700 of them), non-human primates, and non-primate mammals. This comprehensive comparison allowed Hrdlička to discover that both East Asians and Native Americans shared high frequencies of incisor shoveling, a finding critical to his Asian-origin hypothesis for the peopling of the Americas. From his study of the incisors of non-human primates and other mammals, he gleaned insight into evolution and function. He concluded that "rimmed and hollowed incisors" (Figure 1) had evolved independently in different lineages, likely as a way to strengthen the tooth.Some of Hrdlička conclusions in this paper did not stand the test of time-for example, his idea that incisor shoveling is more prevalent in modern human populations that were late to adopt "advanced" technology. Nevertheless, this landmark paper serves to illustrate how the approach of physical anthropology Hrdlička outlined in 1918 can be used to gain insight into, and formulate hypotheses about, human biology. It also serves to illustrate how the study of teeth, specifically, can be approached to gain such insight. Finally, it helped to shape the form of modern dental ...

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Updating histological data on crown initiation and crown completion ages in southern Africans

Cited by 12 publications

References 35 publications

New distance‐based exponential regression method and equations for estimating the chronology of linear enamel hypoplasia (LEH) defects on the anterior dentition

New distance‐based exponential regression method and equations for estimating the chronology of linear enamel hypoplasia (LEH) defects on the anterior dentition

Incremental Structures in Teeth

Dental anthropology in the AJPA: Its roots and heights

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