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Wang Mei-qing - One of the best experts on this subject based on the ideXlab platform.
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The effects of unilateral hyper-erupted third Molar Tooth on apical stress distribution of mandibular teeth by photoelastic analysis
Chinese Journal of Conservative Dentistry, 2002Co-Authors: Wang Mei-qingAbstract:AIM: To investigate the effect of unilateral hyper-erupted third Molar on the stress distribution to the apical area of mandibular teeth. METHODS: Epoxy resin models of normal occlusion and those with unilateral hyper-erupted maxillary or mandibular third Molar Tooth were employed to determine the stress distribution features to the apical area under 2.0 kg vertical load. The values and directions of main stress were both measured and analized. The relationship between the long axes inclination of the mandibular teeth and its stress direction was also considered. RESULTS: In occlusion with maxillary third Molar Tooth hyper-erupted, the main stress of the Tooth socket of Molar areas in the side with hyper-erupted Tooth directed mesial-lingually, while those of opposite side were disto-buccally. But in occlusion with hyper-erupted mandibular third Molar Tooth, it was just the reversal. While the long axes inclination of mandibular teeth in both occlusions had no difference to the normal. Both of opposite sides of hyper-erupted maxillary third Molar Tooth and the side of hyper-erupted mandibular third Molar Tooth showed higher stress values than those of the normal occlusion ( P 0.05) . CONCLUSION: Occlusions with the hyper-erupted third Molar Tooth had significant effect on the stress distribution to the apical area of mandibular teeth.
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The effect of Tooth occlusal surface wear on the inclination of the first mandibular Molar Tooth long axis: An anatomic measurement study
Chinese Journal of Conservative Dentistry, 2001Co-Authors: Wang Mei-qingAbstract:AIM: To investigate the characteristics and significance of the effect of Tooth occlusal surface wear on the long axis of the mandibular first Molar Tooth. METHODS: Three groups of mandibular first Molar Tooth were selected from 3418 collections in our department. Group I: including 18 teeth without obvious attrition, representing those of young age. Group Ⅱ: including 26 teeth with serious attrition, representing the aged ones. Group Ⅲ: including 18 teeth with deep carries on their occlusal surface, representing the weak functioning ones. Only those with two roots were included to make the measurement comparatively. Three-blind methods were taken through the study. RESULTS: It was found that the Tooth crowns in Group II inclined more medially than those in Group I ( P 0.01). No difference was found between Group I and Ⅲ. CONCLUSION: In comparing with the non-wear Tooth the long axis of the mandibular first Molar Tooth with serious wear of occlusal surface inclined even significantly implying that the effect of occlusion functional stimulation may be involved. [
Peter Yu. Petrov - One of the best experts on this subject based on the ideXlab platform.
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Molar Tooth structures in calcareous nodules, early Neoproterozoic Burovaya Formation, Turukhansk region, Siberia
Sedimentary Geology, 2003Co-Authors: Michael C. Pope, Julie K. Bartley, Andrew H. Knoll, Peter Yu. PetrovAbstract:Molar Tooth structures are abundant in large (1-2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, Turukhansk Uplift, northwestern Siberia. Although Molar Tooth structures are regionally abundant in this unit, here they occur only within the nodules. Stable isotopic compositions of Molar-Tooth-filling dolomicrospar cements and of thinly bedded dolomicrite within and surrounding the nodules are indistinguishable from one another. The carbon isotopic compositions (mean δ13C= + 2.8% PDB+/- 0.4) reflect mean average oceanic surface water composition during their formation; the light oxygen isotopic compositions (mean δ18O = -6.4% PDB+/- 2.2) are generally similar to those of other little-altered Meso- to Neoproterozoic limestones and dolostones. These Molar Tooth structures have no features that would support a tectonic origin; they more likely formed through bacterial processes. Carbonate cement filling of these voids occurred soon after their fort-nation, but the mechanism responsible for this carbonate precipitation is currently uncertain. Local restriction of Molar Tooth structures to early diagenetic nodules suggests that penecontemporaneous lithification was required for the formation, or at least preservation, of these widespread Mesoproterozoic to Neoproterozoic features.Organismic and Evolutionary Biolog
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Molar Tooth structures in calcareous nodules, early Neoproterozoic Burovaya Formation, Turukhansk region, Siberia
Sedimentary Geology, 2002Co-Authors: Michael C. Pope, Julie K. Bartley, Andrew H. Knoll, Peter Yu. PetrovAbstract:Abstract Molar Tooth structures are abundant in large (1–2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, Turukhansk Uplift, northwestern Siberia. Although Molar Tooth structures are regionally abundant in this unit, here they occur only within the nodules. Stable isotopic compositions of Molar-Tooth-filling dolomicrospar cements and of thinly bedded dolomicrite within and surrounding the nodules are indistinguishable from one another. The carbon isotopic compositions (mean δ13C=+2.8‰PDB±0.4) reflect mean average oceanic surface water composition during their formation; the light oxygen isotopic compositions (mean δ18O=−6.4‰PDB±2.2) are generally similar to those of other little-altered Meso- to Neoproterozoic limestones and dolostones. These Molar Tooth structures have no features that would support a tectonic origin; they more likely formed through bacterial processes. Carbonate cement filling of these voids occurred soon after their formation, but the mechanism responsible for this carbonate precipitation is currently uncertain. Local restriction of Molar Tooth structures to early diagenetic nodules suggests that penecontemporaneous lithification was required for the formation, or at least preservation, of these widespread Mesoproterozoic to Neoproterozoic features.
Tomosada Sugimoto - One of the best experts on this subject based on the ideXlab platform.
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Parvalbumin- and calretinin-immunoreactive trigeminal neurons innervating the rat Molar Tooth pulp.
Brain research, 1995Co-Authors: Hiroyuki Ichikawa, Toru Deguchi, Tadao Nakago, David M. Jacobowitz, Tomosada SugimotoAbstract:Calcium-binding proteins and neuropeptides were examined in trigeminal neuronal cell bodies retrogradely labeled with Fast blue (FB) from the maxillary Molar Tooth pulp of the rat. FB-labeled cells were located in the maxillary division of the trigeminal ganglion. Approximately 30 and 50% of the labeled cells were immunoreactive for parvalbumin and calcitonin gene-related peptide (CGRP), respectively. The coexpression of these substances was observed in 9.5% of FB-labeled cells. On the other hand, 2.4% of FB-labeled cells exhibited calretinin-immunoreactivity (CR-ir) and 20% tachykinin (TK)-ir. The coexpression of CR and TK was observed in 1.9% of FB-labeled cells, i.e., most of CR-ir FB-labeled neurons coexpressed TK-ir. An immuno-EM method revealed that all parvalbumin-ir nerve fibers in the root pulp were myelinated and that CGRP-ir nerve fibers were both myelinated (15%) and unmyelinated (85%). The present study indicated that primary nociceptors innervating the rat Molar Tooth pulp contained parvalbumin and CR and coexpressed these calcium-binding proteins and neuropeptides. It was suggested that peripheral axons of parvalbumin-ir Tooth pulp primary neurons are all myelinated. Most peripheral CR-ir axons are probably unmyelinated because TK-ir myelinated axons have never been demonstrated in any peripheral organ.
Hiroyuki Ichikawa - One of the best experts on this subject based on the ideXlab platform.
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S100 protein-immunoreactive trigeminal neurons innervating the rat Molar Tooth pulp.
Somatosensory and Motor Research, 2009Co-Authors: Hiroyuki Ichikawa, He Yf, Sugimoto TAbstract:S100-immunoreactivity (ir) was examined in Tooth pulp primary neurons of the rat. An immunofluorescence method demonstrated that the Molar Tooth pulp contained S100-immunoreactive (ir) nerve fibers. In the root pulp, pulp horn and roof of the pulp chamber, S100-ir smooth and varicose fibers ramified and formed subodontoblastic nerve plexuses. All the fibers became varicose at the base of the odontoblastic layer and extended to the odontoblastic layer. Some varicose endings could be traced into the dentin. The trigeminal neurons retrogradely labeled with fluorogold (FG) from the first and second maxillary Molar Tooth pulps exhibited S100- and parvalbumin-ir. Approximately 60% and 24% of the labeled cells were ir for S100 and parvalbumin, respectively. Virtually all parvalbumin-ir FG-labeled cells showed S100-ir, while 40% of S100-ir ones coexpressed parvalbumin-ir. An immunoelectron microscopic method revealed that all myelinated axons and half of the unmyelinated axons in the root pulp contained S100-ir. ...
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Parvalbumin- and calretinin-immunoreactive trigeminal neurons innervating the rat Molar Tooth pulp.
Brain research, 1995Co-Authors: Hiroyuki Ichikawa, Toru Deguchi, Tadao Nakago, David M. Jacobowitz, Tomosada SugimotoAbstract:Calcium-binding proteins and neuropeptides were examined in trigeminal neuronal cell bodies retrogradely labeled with Fast blue (FB) from the maxillary Molar Tooth pulp of the rat. FB-labeled cells were located in the maxillary division of the trigeminal ganglion. Approximately 30 and 50% of the labeled cells were immunoreactive for parvalbumin and calcitonin gene-related peptide (CGRP), respectively. The coexpression of these substances was observed in 9.5% of FB-labeled cells. On the other hand, 2.4% of FB-labeled cells exhibited calretinin-immunoreactivity (CR-ir) and 20% tachykinin (TK)-ir. The coexpression of CR and TK was observed in 1.9% of FB-labeled cells, i.e., most of CR-ir FB-labeled neurons coexpressed TK-ir. An immuno-EM method revealed that all parvalbumin-ir nerve fibers in the root pulp were myelinated and that CGRP-ir nerve fibers were both myelinated (15%) and unmyelinated (85%). The present study indicated that primary nociceptors innervating the rat Molar Tooth pulp contained parvalbumin and CR and coexpressed these calcium-binding proteins and neuropeptides. It was suggested that peripheral axons of parvalbumin-ir Tooth pulp primary neurons are all myelinated. Most peripheral CR-ir axons are probably unmyelinated because TK-ir myelinated axons have never been demonstrated in any peripheral organ.
Michael C. Pope - One of the best experts on this subject based on the ideXlab platform.
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Molar Tooth structures in calcareous nodules, early Neoproterozoic Burovaya Formation, Turukhansk region, Siberia
Sedimentary Geology, 2003Co-Authors: Michael C. Pope, Julie K. Bartley, Andrew H. Knoll, Peter Yu. PetrovAbstract:Molar Tooth structures are abundant in large (1-2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, Turukhansk Uplift, northwestern Siberia. Although Molar Tooth structures are regionally abundant in this unit, here they occur only within the nodules. Stable isotopic compositions of Molar-Tooth-filling dolomicrospar cements and of thinly bedded dolomicrite within and surrounding the nodules are indistinguishable from one another. The carbon isotopic compositions (mean δ13C= + 2.8% PDB+/- 0.4) reflect mean average oceanic surface water composition during their formation; the light oxygen isotopic compositions (mean δ18O = -6.4% PDB+/- 2.2) are generally similar to those of other little-altered Meso- to Neoproterozoic limestones and dolostones. These Molar Tooth structures have no features that would support a tectonic origin; they more likely formed through bacterial processes. Carbonate cement filling of these voids occurred soon after their fort-nation, but the mechanism responsible for this carbonate precipitation is currently uncertain. Local restriction of Molar Tooth structures to early diagenetic nodules suggests that penecontemporaneous lithification was required for the formation, or at least preservation, of these widespread Mesoproterozoic to Neoproterozoic features.Organismic and Evolutionary Biolog
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Molar Tooth structures in calcareous nodules, early Neoproterozoic Burovaya Formation, Turukhansk region, Siberia
Sedimentary Geology, 2002Co-Authors: Michael C. Pope, Julie K. Bartley, Andrew H. Knoll, Peter Yu. PetrovAbstract:Abstract Molar Tooth structures are abundant in large (1–2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, Turukhansk Uplift, northwestern Siberia. Although Molar Tooth structures are regionally abundant in this unit, here they occur only within the nodules. Stable isotopic compositions of Molar-Tooth-filling dolomicrospar cements and of thinly bedded dolomicrite within and surrounding the nodules are indistinguishable from one another. The carbon isotopic compositions (mean δ13C=+2.8‰PDB±0.4) reflect mean average oceanic surface water composition during their formation; the light oxygen isotopic compositions (mean δ18O=−6.4‰PDB±2.2) are generally similar to those of other little-altered Meso- to Neoproterozoic limestones and dolostones. These Molar Tooth structures have no features that would support a tectonic origin; they more likely formed through bacterial processes. Carbonate cement filling of these voids occurred soon after their formation, but the mechanism responsible for this carbonate precipitation is currently uncertain. Local restriction of Molar Tooth structures to early diagenetic nodules suggests that penecontemporaneous lithification was required for the formation, or at least preservation, of these widespread Mesoproterozoic to Neoproterozoic features.
