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31 results for “tooth replacement”
FIGURE 3 in Histology of spinosaurid dinosaur teeth from the Albian-Cenomanian of Morocco: Implications for tooth replacement and ecology
FIGURE 3. (A-E) Teeth SNSB-BSPG 2008 XXXVII 1a–5a in mesial (left) and lingual (right) view. All scale bars equal 1 cm.
Text-fig. 4. Tooth replacement by the barbary ground squirrel (Atlantoxerus getulus). a – right maxillary with DP3–M3 (MNCN- 5522) showing the relative position of the two deciduous teeth; b – right maxillary with P3–M3 (MNCN-5538) showing the replacement of the DP4 by the P4 (not erupted). Blue: DP4; green: P4; yellow DP3; red: P3. in Dental Anomaly In A Middle Miocene Fossil Of The Genus Spermophilinus (Rodentia, Sciuridae) From Southern Germany
Text-fig. 4. Tooth replacement by the barbary ground squirrel (Atlantoxerus getulus). a – right maxillary with DP3–M3 (MNCN- 5522) showing the relative position of the two deciduous teeth; b – right maxillary with P3–M3 (MNCN-5538) showing the replacement of the DP4 by the P4 (not erupted). Blue: DP4; green: P4; yellow DP3; red: P3.
Figure 3 in Tooth shape in teleosts and its link to tooth spacing and replacement
Figure 3. - The upper jaw dentition in three different life stages of Eretmodus cf. cyanostictus (lineage A) (A-C) (11.4 mm SL, 23.4 mm SL and 51.0 mm S.L., resp.) and magnifications of an individual tooth in the respective dentition (A'-C'). D: Lower jaw of the specimen used in (B, B'), showing monocuspid teeth, formed extramedullary (arrowhead), at the end of a row of spatulate teeth, displaying intramedullary replacement. D': Detail of the last spatulate tooth (arrow) showing replacement tooth forming intramedullary below (asterisk). Scale bars: A, B', D' = 100 µm; A' = 15 µm; B, C = 500 µm; C', D = 200 µm.
Figure 1. – A in Tooth shape in teleosts and its link to tooth spacing and replacement
Figure 1. – A: Scanning electron micrograph of the pharyngeal dentition of a one month-old zebrafish (10.4 mm SL). Note considerable differences in tooth shape in the different positions, and micro-ornamentations (arrowheads) at the tooth tip. Anterior to the left, dorsal to the top. B: Detail of the micro-ornamentations of the tooth tip. Note major cusp (asterisk), minor cusp (arrow), and basal protuberance (arrowhead). C: Transmission electron micrograph of a developing replacement tooth in a one month-old zebrafish (9 mm S.L.). Note that the minor cusp is developing with just one odontoblast extending into it (arrow). Scale bars: A = 50 µm; B = 10 µm; C = 10 µm.
Data from: Computed tomographic analysis of dental system of three Jurassic ceratopsians: implications for the evolution of the tooth replacement pattern and diet in early-diverging ceratopsians
<p><span>T</span><span>he </span><span>dental system of ceratops</span><span>ids is among the most specialized structure in Dinosauria</span><span>, and includes high angled wear surfaces, split tooth roots, and multiple teeth in each tooth family. However, the early evolution of this unique dental system is generally poorly understood due to a lack of knowledge of the dental morphology and development in early-diverging ceratopsians.</span><span> Here we study the dental system of </span><span>three</span><span> of the earliest-diverging Chinese ceratopsians</span><span>: </span><em><span>Yinlong</span></em><span> and <em>Hualianceratops</em> from the early Late Jurassic of Xinjiang</span><span>,</span><span> and <em>Chaoyangsaurus</em> from the Late Jurassic of Liaoning. By using micro-computed tomographic analyses, our study has revealed significant new information regarding the dental system of these early ceratopsians, including </span><span>no</span><span> more than five replacement teeth in each jaw quadrant; at most one generation of replacement teeth in each alveolus; nearly full resorption of the functional tooth root during tooth replacement; and occlusion with low-angled, concave wear facets that differs significantly from the shearing occlusal system seen in ceratopsids. <em>Yinlong</em> displays an increase in the number of maxillary tooth alveoli and a decrease in the number of replacement teeth during ontogeny as well as the retention of remnants of functional teeth in the largest individual.</span> <span>Early-diverging ceratopsians thus display a relatively slow tooth replacement rate compared to late-diverging ceratopsians.</span> <span>Combined with paleobotany and palaeoenvironment data, <em>Yinlong</em> likely uses gastroliths to triturate foodstuffs, and t</span><span>he difference in diet strategy might have influenced the pattern of tooth replacement in later-diverging ceratopsians.</span></p>
Data from: Computed tomographic analysis of dental system of three Jurassic ceratopsians: implications for the evolution of the tooth replacement pattern and diet in early-diverging ceratopsians
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FIGURES 6–12. Liothrips jatrophae. 6. Female fore tarsal tooth. 7. Head. 8. Pronotum. 9. Antenna. 10 in Replacement names for two homonyms of Liothrips brevitubus Karny: one from California, the other for a species damaging Jatropha crops in Mexico
FIGURES 6–12. Liothrips jatrophae. 6. Female fore tarsal tooth. 7. Head. 8. Pronotum. 9. Antenna. 10. Meso and metanota of micropterous female. 11. Meso and metanota, and pelta of macropterous female. 12. Tergites II–III of macropterous female.
Soft and Hard Tissue Changes After Immediate Single-tooth Replacement
ClinicalTrials.gov study NCT03784430. IPD Sharing: NO. Countries: 1. Publications: 4.
Use of CBCT-based Tooth Replica in Tooth Autotransplantation to Improve the Outcome of Tooth Replacement in Children
ClinicalTrials.gov study NCT02464202. IPD Sharing: NO. Countries: 1. Publications: 1.
A Study on the Effects of Two Nicotine Replacement Products on Tooth Staining
ClinicalTrials.gov study NCT01440985. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Impact of Soft Tissue Grafts on Tissue Alterations After Immediate Tooth Replacement
ClinicalTrials.gov study NCT02922075. IPD Sharing: UNDECIDED. Countries: 1. Publications: 5.
Periodontal Regeneration Versus Tooth Extraction and Replacement Denture in Teeth With Periodontal Hopeless Prognosis
ClinicalTrials.gov study NCT04227964. IPD Sharing: NO. Countries: 1. Publications: 1.
Data from: The dentary of Wareolestes rex (Megazostrodontidae): a new specimen from Scotland and implications for morganucodontan tooth replacement
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FIGURE 6 in Histology of spinosaurid dinosaur teeth from the Albian-Cenomanian of Morocco: Implications for tooth replacement and ecology
FIGURE 6. (A) Natural logarithm of tooth formation rate plotted against the natural logarithm of the body mass. Dark blue = sauropodomorpha, light blue = sauropods, purple = ornithischians, green = theropods. (B) Natural logarithm of known tooth replacement rates plotted against natural logarithm of tooth formation rates including all available archosaurs, with a regression line and the regression equation. Colour code as above; yellow = spinosaur with the standard deviation as error bars. (C) Natural logarithm of known tooth replacement rates plotted against natural logarithm of tooth formation rates including theropods only, with a regression line and the regression equation. Colour code as above. Silhouette of Triceratops by R. Amos, all other silhouettes by S. Hartman from www.phylopic.org; licence https:/ /creativecommons.org/licenses/by-nc-sa/3.0/.
FIGURE 5 in Histology of spinosaurid dinosaur teeth from the Albian-Cenomanian of Morocco: Implications for tooth replacement and ecology
FIGURE 5. (A) Section SNSB-BSPG 2008 XXXVII 4b; scale bar equals 1 mm. (B) Section SNSB-BSPG 2008 XXXVII 4b with clearly visible growth lines; scale bar equals 1 mm. (C) Section SNSB-BSPG 2008 XXXVII 4c; scale bar equals 1 mm. (D) Section SNSB-BSPG 2008 XXXVII 5b shows the dentine tubuli curving towards the apex; scale bar equals 1 mm. (E) Section SNSB-BSPG 2008 XXXVII 5b shows the red mineralisation and the growth lines; scale bar equals 1 mm. (F) Section SNSB-BSPG 2008 XXXVII 5b. The arrow indicates the foreign particle with bent growth lines to its left and right; scale bar equals 1 mm.
FIGURE 2 in Histology of spinosaurid dinosaur teeth from the Albian-Cenomanian of Morocco: Implications for tooth replacement and ecology
FIGURE 2. (A) Positions of the measurements in labial (left) and distal (right) view. L = length from the crown (apex) to the basal end; WAPa = width measured anterio-posteriorly at the apex; WAPb = width measured anterior-posteriorly at the base; WLLa = width measured labio-lingually at the apex; WLLb = width measured labio-lingually at the base. PCap = width of the pulp cavity measured anterio-posteriorly; PCll = width of the pulp cavity measured labio-lingually. (B-F) Positions and collection IDs of the thin sections (SNSB-BSPG 2008 XXXVII followed by the number and letter given in the pictures). All scale bars equal 1 cm.
FIGURE 4 in Histology of spinosaurid dinosaur teeth from the Albian-Cenomanian of Morocco: Implications for tooth replacement and ecology
FIGURE 4. (A) Section SNSB-BSPG 2008 XXXVII 1b. The growth lines are visible in the upper half of the section; scale bar equals 1 mm. (B) Section SNSB-BSPG 2008 XXXVII 1e shows the curving of the dentine near the enamel; scale bar equals 1 mm. (C) Section SNSB-BSPG 2008 XXXVII 3b shows a higher density of growth lines around the pulp cavity. The arrow indicates the mineralised gap in the internal wall of the tooth; scale bar equals 1 mm. (D) Section SNSB-BSPG 2008 XXXVII 2b shows the red mineralisation and fissures; scale bar equals 5 mm. (E) Section SNSB-BSPG 2008 XXXVII 2c. The arrow indicates the area of a series of start of alternating incremental lines; scale bar equals 1 mm. (F) Section SNSB-BSPG 2008 XXXVII 2c. The arrow indicates curving incremental lines; scale bar equals 1 mm.
FIGURE 1 in Histology of spinosaurid dinosaur teeth from the Albian-Cenomanian of Morocco: Implications for tooth replacement and ecology
FIGURE 1. (A) Schematic drawing of a tooth cross section showing the concentric incremental lines of von Ebner and the radial tubuli. (B) Schematic drawing of a tooth longitudinal section; it demonstrates why cross sections do not always show all growth lines.
Data from: Tooth replacement in basal sarcopterygians
Teeth were an important innovation in vertebrate evolution but basic aspects of early dental evolution remain poorly understood. Teeth differ from other odontode organs, like scales, in their organised, sequential pattern of replacement. However, tooth replacement patterns also vary between the major groups of jawed vertebrates. Although, tooth replacement in stem- osteichthyans and extant species has been intensively studied it has been difficult to resolve scenarios for the evolution of osteichthyan tooth replacement because of a dearth of evidence from living and fossil sarcopterygian fishes. Here we provide new anatomical data informing patterns of tooth replacement in the Devonian sarcopterygian fishes Onychodus, Eusthenopteron and Tiktaalik and the living coelacanth Latimeria based on microfocus- and synchrotron radiation-based X-Ray microtomography. Early sarcopterygians generated replacement teeth on the jaw surface in a pattern similar to stem-osteichthyans, with damaged teeth resorbed and replacement teeth developed on the surface of the bone. However, resorption grades and development of replacement teeth vary spatially and temporally within the jaw. Particularly in Onychodus, where teeth were also shed through anterior rotation and resorption of bone at the base of the parasymphyseal tooth whorl, with new teeth added posteriorly. As tooth whorls are also present in more stem-osteichthyans, and statodont tooth whorls are present among acanthodians (putative stem-chondrichthyans), rotational replacement of the anterior dentition may be a stem-osteichthyan character. Thus, our data are compatible with a disparate pattern of evolution of tooth replacement and more complex evolutionary history of jawed vertebrates.
Figure 2 in Tooth shape in teleosts and its link to tooth spacing and replacement
Figure 2. - The heterodont dentition of an advanced perciform teleost, the wolffish Anarhichas sp., according to Owen (1840-1845).
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