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1,210 results for “teeth”
Photoacoustic tomography versus cone-beam computed tomography versus micro-computed tomography: Accuracy of 3D reconstructions of human teeth
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Data from: Sauropod teeth from the Middle Jurassic of Madagascar, and the oldest record of Titanosauriformes
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Data for: Coping with abrasive food – diverging composition of radular teeth in two Porifera-consuming nudibranch species (Mollusca, Gastropoda)
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Data from: Marine strontium isotopes preserved in fossil shark teeth calibrate Neogene land mammal evolution
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Data for: The biomechanics of tooth strength: testing the utility of simple models for predicting fracture in geometrically complex teeth
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Fig. 55. Batomorphii indet., teeth. A–E. MSC 37675.2, basal Lisbon Formation. A. Labial view. B. Lingual view. C. Profile view. D. Oral view. E. Basal view. F–J. MSC 37675.1, basal Lisbon Formation. F. Labial view. G. Lingual view. H. Profile view. I. Oral view. J. Basal view. K–O in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 55. Batomorphii indet., teeth. A–E. MSC 37675.2, basal Lisbon Formation. A. Labial view. B. Lingual view. C. Profile view. D. Oral view. E. Basal view. F–J. MSC 37675.1, basal Lisbon Formation. F. Labial view. G. Lingual view. H. Profile view. I. Oral view. J. Basal view. K–O. SC2012.42.154, basal Lisbon Formation. K. Labial view. L. Lingual view. M. Profile view. N. Oral view. O. Basal view. Labial at top in oral and basal views. Labial at top in oral and basal views. Scale bars = 1 mm.
Fig. 47. Myliobatis Cuvier, 1816, teeth. A–J in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 47. Myliobatis Cuvier, 1816, teeth. A–J. Myliobatis sp. 1. A–E. MSC 38937, median tooth, lower Tallahatta Formation. A. Oral view. B. Basal view. C. Lingual view. D. Labial view. E. Profile view. F–J. MSC 33293, median tooth, lower Tallahatta Formation. F. Oral view. G. Basal view. H. Lingual view. I. Labial view. J. Profile view. — K–T. Myliobatis sp. 2. K–O. MSC 38640, median tooth, Gosport Sand. K. Oral view. L. Basal view. M. Lingual view. N. Labial view. O. Profile view. P–T. MSC 38849.1, lateral tooth, basal Gosport Sand. P. Oral view. Q. Basal view. R. Labial view. S. Lingual view. T. Profile view. Labial at top in oral and basal views. Scale bars: A–O = 5 mm; P–T = 2 mm.
Fig. 41. Aturobatis aff. A. aquensis Adnet, 2006, teeth. A–D. MSC 37687, basal Tallahatta Formation. A. Orolingual view. B. Labial view. C. Oral view. D. Profile view. E–H. MSC 38464, basal Tallahatta Formation. E. Orolingual view. F. Labial view. G. Oral view. H in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 41. Aturobatis aff. A. aquensis Adnet, 2006, teeth. A–D. MSC 37687, basal Tallahatta Formation. A. Orolingual view. B. Labial view. C. Oral view. D. Profile view. E–H. MSC 38464, basal Tallahatta Formation. E. Orolingual view. F. Labial view. G. Oral view. H. Profile view. Scale bars = 5 mm.
Fig. 36. Galeocerdo clarkensis White, 1956, teeth. A–E. MSC 188.68 in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 36. Galeocerdo clarkensis White, 1956, teeth. A–E. MSC 188.68, lateral tooth, basal Gosport Sand. A. Labial view. B. Close–up of distal notch. C. Lingual view. D. Close–up of mesial compound serrations. E. Mesial view. F–J. MSC 188.272, lateral tooth, basal Gosport Sand. F. Labial view. G. Close–up of mesial compound serrations. H. Lingual view. I. Close–up of distal notch. J. Mesial view. K–O. MSC 2382.4, lateral tooth, Gosport Sand. K. Labial view. L. Close–up of distal notch. M. Lingual view. N. Close–up of mesial serrations. O. Mesial view. P–T. MSC 37592, anterolateral tooth, basal Gosport Sand. P. Labial view. Q. Close–up of mesial compound serrations. R. Lingual view. S. Close–up of distal notch. T. Mesial view. Scale bars = 5 mm.
Fig. 35. Galeocerdo eaglesomei White, 1955, teeth. A–E in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 35. Galeocerdo eaglesomei White, 1955, teeth. A–E. MMNS VP–7496.1, anterolateral tooth, "upper" Lisbon Formation. A. Labial view. B. Close–up of distal notch. C. Lingual view. D. Close–up of simple mesial serrations. E. Mesial view. F–J. MMNS VP–7496.2, lateral tooth, "upper" Lisbon Formation. F. Labial view. G. Close–up of distal notch. H. Lingual view. I. Close–up of simple mesial serrations. J. Mesial view. K–O. MSC 37619.1, lateral tooth, "upper" Lisbon Formation, reversed for comparison, courtesy of James Lowery. K. Labial view. L. Close–up of distal notch. M. Lingual view. N. Close–up of simple mesial serrations. O. Mesial view. Scale bars = 5 mm.
Fig. 24. Hemipristis curvatus Dames, 1883, teeth. A–C. MSC 2377 in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 24. Hemipristis curvatus Dames, 1883, teeth. A–C. MSC 2377, lower anterior tooth, Gosport Sand. A. Labial view. B. Lingual view. C. Mesial view. D–F. ALMNH PV1994.4.220, upper lateral tooth, Gosport Sand. D. Labial view. E. Lingual view. F. Mesial view. G–I. ALMNH PV1994.4.221, upper lateral tooth, Gosport Sand. G. Labial view. H. Lingual view. I. Mesial view. J–L. ALMNH PV1994.4.189, lower lateral tooth, Gosport Sand. J. Labial view. K. Lingual view. L. Mesial view. Scale bars = 5 mm.
Fig. 18. Odontaspis winkleri Leriche, 1905, teeth. A–C. MSC 33380 in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 18. Odontaspis winkleri Leriche, 1905, teeth. A–C. MSC 33380, anterior tooth, lower Tallahatta Formation. A. Labial view. B. Lingual view. C. Mesial view. D–F. SC2012.47.162, anterior tooth, basal Lisbon Formation. D. Labial view. E. Lingual view. F. Mesial view. G–I. MSC 35764, lateral tooth, lower Tallahatta Formation. G. Labial view. H. Lingual view. I. Mesial view. J–L. WSU CC535.1, lateral tooth, basal Lisbon Formation. J. Labial view. K. Lingual view. L. Mesial view. Scale bars = 5 mm.
Fig. 9. Otodontidae Glikman, 1964, teeth. A–L in Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, including an analysis of otoliths
Fig. 9. Otodontidae Glikman, 1964, teeth. A–L. Otodus (Otodus) sp. A–C. MSC 2999.2, lower Tallahatta Formation. A. Labial view. B. Lingual view. C. Mesial view. D–F. MSC 3008.1, lower Tallahatta Formation. D. Labial view. E. Lingual view. F. Mesial view. G–I. MSC 35761.2, lower Tallahatta Formation. G. Labial view. H. Lingual view. I. Mesial view. J–L. MSC 35761.1, lower Tallahatta Formation. J. Labial view. K. Lingual view. L. Mesial view. — M–X. Otodus (Carcharocles) sp. M–O. MSC 37019, basal Lisbon Formation, courtesy of Carl Sloan. M. Labial view. N. Lingual view. O. Distal view. P–R. MSC 37172, basal Lisbon Formation, courtesy of James Lowery. P. Labial view. Q. Lingual view. R. Mesial view. S–U. MSC 2371, Gosport Sand. S. Labial view. T. Lingual view. U. Mesial view. V–X. MSC 2370, Gosport Sand. V. Labial view. W. Lingual view. X. Distal view. Scale bars: A–F, M–X = 1 cm; G–L = 5 mm.
METHODS. Bovine ilia were used in the simulations because their histological structure (a fibrolamellar cortex overlying cancellous bone26) was found to match that of the Triceratops ilium. Bone sections 10 x 50 x 縠 3.0 cm with cortices ranging from 0.5 to 5.5 mm in depth (the range of initial cortical-thickness estimates based on gross morphology) were mounted on a servohydraulic mechanical loading frame (MTS Bionix, Minneapolis) and penetrated with an aluminium-bronze T. rex tooth replica. The replica was cast from an actual adult T. rex maxillary tooth, after casts made from some ofthe deeper bite marks revealed the size and shape of the teeth that had impacted the pelvis8 • The replica was penetrated into the ilia sections at 1 mm s-1 to a depth of 11.5 mm, equivalent to the maximum depth of the deepest ilium bite mark8 • Forces were measured with an MTS 25 N strain-gauge-based axial load cell accurate to 0.2%. The forces increased with increasing penetration depth even after the cortical layer had been perforated and the underlying cancellous bone was being crushed. The increase in force with penetration depth is attributed to a greater cortical surface area coming into contact with the semi-conical penetrator tooth as it descended through the ilia. in Bite-force estimation for Tyrannosaurus rex from tooth-marked bones
METHODS. Bovine ilia were used in the simulations because their histological structure (a fibrolamellar cortex overlying cancellous bone26) was found to match that of the Triceratops ilium. Bone sections 10 x 50 x 縠 3.0 cm with cortices ranging from 0.5 to 5.5 mm in depth (the range of initial cortical-thickness estimates based on gross morphology) were mounted on a servohydraulic mechanical loading frame (MTS Bionix, Minneapolis) and penetrated with an aluminium-bronze T. rex tooth replica. The replica was cast from an actual adult T. rex maxillary tooth, after casts made from some ofthe deeper bite marks revealed the size and shape of the teeth that had impacted the pelvis8 • The replica was penetrated into the ilia sections at 1 mm s-1 to a depth of 11.5 mm, equivalent to the maximum depth of the deepest ilium bite mark8 • Forces were measured with an MTS 25 N strain-gauge-based axial load cell accurate to 0.2%. The forces increased with increasing penetration depth even after the cortical layer had been perforated and the underlying cancellous bone was being crushed. The increase in force with penetration depth is attributed to a greater cortical surface area coming into contact with the semi-conical penetrator tooth as it descended through the ilia.
Sex prediction based on teeth mesiodistal width: model development in a Portuguese population
<p>168 pretreatment dental casts of orthodontics Portuguese subjects (59 males and 109 females) were included. Mesiodistal widths from right first molar to left first molar were measured on each pretreatment cast to the nearest 0.01 mm using digital caliper.</p>
FIGURE 25. Vomerine teeth type. A in Descriptions of neurocranium morphology in 34 species of moray eels (Muraenidae) found in Taiwan
FIGURE 25. Vomerine teeth type. A: long and sharp; B: short and stout; C: character is unobservable
Data from: Evolutionary origins of teeth in jawed vertebrates: conflicting data from acanthothoracid dental plates ('Placodermi')
Placoderms (Devonian fossil fishes) are resolved phylogenetically to the base of jawed vertebrates and provide important evidence for evolutionary origins of teeth, particularly with respect to the Arthrodira. The arthrodires represent a derived group of placoderms; the dentition of other more primitive placoderms such as the acanthothoracids is less well known. Articulated acanthothoracid dental plates are rare; x-ray computed tomography of a single, unique specimen, along with 3D segmentation of bone, oral denticles and vascular spaces, provides intrinsic developmental and topological information relevant to tooth origins. Recently, a disarticulated element was identified as a dental plate of the acanthothoracid Romundina stellina, with synchrotron microtomography providing characters to comment on ongoing debates regarding the evolution of teeth. We used segmental quantitative methods to re-analyse this data, for comparison to the articulated and unquestionable acanthothoracid dental plates above. We demonstrate substantial differences between these, disputing the identity of the isolated plate of R. stellina as a dental plate, and thus its relevance to questions of tooth evolution.
Data from: Performance of shark teeth during puncture and draw: implications for the mechanics of cutting
The performance of an organism's feeding apparatus has obvious implications for its fitness and survival. However, the majority of studies that focus on chondrichthyan feeding have largely ignored the role of teeth. Studying the functional morphology of shark teeth not only elucidates the biological role that teeth play in feeding, but also provides insight specifically into the evolution of shark feeding because teeth are often the only structures available in the fossil record. In the present study, we investigate the puncture and draw performance of three general categories of extant teeth, tearing-type, cutting-type, and cutting–clutching type, as well as three fossil morphologies, utilizing a universal testing system. Differences in puncturing performance occurred among different prey items, indicating that not all 'soft' prey items are alike. The majority of teeth were able to puncture different prey items, and differences in puncture performance also occurred among tooth types; however, few patterns emerged. In some cases, broader triangular teeth were less effective at puncturing than narrow-cusped teeth. There were no differences between the maximum draw forces and maximum puncture forces. Many of the shark teeth in the present study were not only able to perform draw and puncture equally well, but also many tooth morphologies were functionally equivalent to each other. The findings obtained in the present study lend little support to the belief that shark tooth morphology is a good predictor of biological role.
FIGURES 10, 11. Female labella. 10. Thricops simplex. 11 in A new European species of Drymeia Meigen (Diptera: Muscidae) near D. brumalis (Rondani), with observations of a unique prestomal teeth structure
FIGURES 10, 11. Female labella. 10. Thricops simplex. 11. Drymeia vicana. (Same scale.)
Dataset for "Alveoli, teeth, and tooth loss: Understanding the homology of internal mandibular structures in mysticete cetaceans"
<p>ZIP folders containing STL files of USNM specimens for Peredo et al.</p>
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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