scispace - formally typeset
Search or ask a question
Author

H. T. Groeneveld

Bio: H. T. Groeneveld is an academic researcher from University of Pretoria. The author has contributed to research in topics: Euclidean distance & Sample size determination. The author has an hindex of 2, co-authored 2 publications receiving 15 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: A strong association between arcadal length (jaw size) dependence, and the dimensional stability of individual teeth is suggested, which allows for a reassessment of some of the problems associated with hominid dental evolution.
Abstract: Intra-arcadal mesiodistal and buccolingual tooth size correlations were evaluated in a sample of 125 caucasoids with ideal occlusion. Dental dimensions were corrected for arcade mength (as a measure of jaw size) by a series of regression analyses of each mesiodistal dimension on the sum of the mesiodistal dimensions within each arcade. Regression coefficients of tooth dimension on arcade length were calculated to gain an insight into the dimensional sensitivity of individual teeth to arcade length variation. The data presented here suggest a strong association between arcadal length (jaw size) dependence, and the dimensional stability of individual teeth. When corrected for arcade length, a definite pattern of tooth size correlation emerges: postcanine maxillary and mandibular teeth are negatively correlated to the anterior teeth and are positively correlated to one another. The hypothesis is developed that anterior and postcanine teeth should be viewed as two separate and negatively size-correlated units, beyond the boundaries of the four morphological tooth classes. Recognition of this basic dichotomous size arrangement within each jaw allows for a reassessment of some of the problems associated with hominid dental evolution.

11 citations

Journal ArticleDOI
TL;DR: In this article, the usefulness of the M-statistic in odontomorphometric distance analyses was evaluated against a battery of more traditional metrics, which included Mahalanobis' D2, Penrose's shape metric, the Manhattan distance and Delta.
Abstract: The usefulness of the M-statistic in odontomorphometric distance analyses was evaluated against a battery of more traditional metrics, which included Mahalanobis' D2, Penrose's shape metric, the Manhattan distance and Delta. Odontometric data used for the analyses were derived from 202 Paraguayan Lengua Indians and 125 contemporary caucasoids. Efron's Bootstrap procedure was used to evaluate the statistical accuracy of the different metrics, when each was applied to the same populations. Additionally, metric stability in the face of reduced sample size, statistical bias resulting from over- and underestimation, and the effects of standardization, were investigated. Our results indicated that Penrose's shape metric rather that the recently introduced M-statistic was the most reliable metric evaluated. Penrose's shape remained the most reliable when sample size was artificially reduced and when raw data were used. Interestingly, Mahalanobis' generalized distance emerged as the least reliable statistics, especially when used on small sample sizes.

5 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: The results show a clear distinction between the morphology seen in earlier hominin taxa such as Australopithecus and African early Homo, as well as Asian H. erectus, and more recent groups such as European H. heidelbergensis, neanderthalensis, and H. sapiens.

122 citations

Journal ArticleDOI
TL;DR: The notion that there exists a 'species-specific' amount of enamel over the tooth crown must be reconsidered, and one should refrain from pooling different tooth types for taxonomic purposes.

35 citations

Journal ArticleDOI
TL;DR: Allometric analyses indicate that mandibular length scales negatively allometric to maxilloalveolar length and to bigonial width, that canine base area scales positively to upper and lower jaw length, and that all the other teeth scale negatively to jaw length.
Abstract: Static adult intraspecific allometry of jaws and teeth was investigated in a sample of 100 Negro crania. The relations between tooth area, postcanine surface, incisor surface, and four viscerocranial measures were examined separately for males and females. Our results indicate a marked lack of morphological integration between P-sets within the orofacial subregion and a similar lack of correspondence between jaw size and tooth size. Allometric analyses indicate that mandibular length scales negatively allometric to maxilloalveolar length and to bigonial width, that canine base area scales positively to upper and lower jaw length, and that all the other teeth scale negatively to jaw length. The postcanine surface area was found to be negatively allometric to the canine base area, which in turn scaled isometrically to incisor surface. Hence, any lengthening of the mandible will tend to be associated with a relative shortening of the maxilla, with relatively larger canines and a relative reduction of the cheek teeth.

20 citations

Journal ArticleDOI
TL;DR: Analysis of unpublished hominin dental remains recovered from the late Early Pleistocene Gran Dolina-TD6.2 level of the Sierra de Atapuerca supports the taxonomic validity of Homo antecessor, since this species presents a unique mosaic of traits.

17 citations

Journal ArticleDOI
TL;DR: The size relationship between the crown area of the lower canines, third and fourth premolars, and first molars in hominids is examined and the P4:P3 size ratio is considered as an excellent indicator of the taxonomic and philogenetic status of fossil hominid.
Abstract: The size relationship between the crown area of the lower canines (Cs), third (P3s) and fourth premolars (P4s), and first molars (M1s) in hominids is examined by means of the regression analysis. The lower P3 seem to be under the influence of those factors that control both the size of the anterior and posterior teeth, and the P4:P3 size ratio is related to the relative size of the anterior and posterior dentitions. So, the P4>P3 sequence is associated with the megadontia and hipermegadontia of the posterior teeth, whereas the expansion of the anterior teeth produces the P3>P4 sequence. We consider the P4:P3 size ratio as an excellent indicator of the taxonomic and philogenetic status of fossil hominids.

11 citations