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1
Emily Harwitz. "Metallic edges make ant teeth razor sharp." C&EN Global Enterprise 99, no. 33 (2021): 10. http://dx.doi.org/10.1021/cen-09933-scicon6.
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Brookes, J. B., and I. J. Lean. "Teeth Clipping in Piglets." Proceedings of the British Society of Animal Production (1972) 1993 (March 1993): 75. http://dx.doi.org/10.1017/s0308229600024016.
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Piglets are born with 8 very sharp ‘needle-teeth’ - 4 incisors and 4 canines. These pointed teeth grow outwards, two on either side in each jaw, leaving an open space in the front of the mouth. In intensively run units, the tips of these teeth are usually removed soon after birth, using a pair of side cutter pliers. This is said to reduce the severity of piglet face wounding, caused by natural competition for space at the udder and during play. Reducing injury by clipping teeth is also said to limit the sites of entry for micro-organisms. Blunt clippers and clipping teeth too close to the gum can shatter teeth, providing places of entry for microbes and leaving sharp edges which can lead to deep wounds in tongues and lips. The aim of this trial was to determine whether grinding teeth is a preferable alternative to clipping teeth
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Derelli, Fatih Mehmet, Gültekin Atalan, and Muhammed Kaan Yönez. "A Prospective View of Oral and Dental Examination and Dental Diseases in Horses in İzmit and Karacabey Pension Hara of Turkey Jockey Club." Harran Üniversitesi Veteriner Fakültesi Dergisi 14, no. 1 (2025): 77–85. https://doi.org/10.31196/huvfd.1666852.
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This study, the aim was to prospectively examine the oral cavities and teeth of 300 horses of various age groups housed at the İzmit and Karacabey Pension Hara of the Turkish Jockey Club, focusing on dental disorders and dental diseases. Within the scope of the study, the oral cavities of the examined 300 horses were inspected, including the color of the oral mucosa, their appetite, whether they finished their feed, body condition scores, the type of feed they were fed, and whether salivation occurred during feeding. Following clinical examinations of the 300 horses, endoscopic and radiological examinations were performed, revealing dental disease and disorders, particularly in the molar teeth, in 59 horses. Among the group of 59 horses, consisting of stallions, broodmares, and yearlings aged 7-25 years, tooth extraction of deciduous teeth, tooth displacement, mobile teeth, caries, sharp-edged teeth, odontoclastic tooth resorption, and conditions such as equine odontoclastic tooth resorption and hypercementosis (EOTRH), fistula formation, gum abscess, gingivitis, and periodontitis were identified. Clinically, 54 out of 59 horses had their molar teeth rasped to correct sharp edges, resulting in the normalization of chewing movements and the ability of horses to consume their feed comfortably. Following treatment, the horses were monitored, and efforts were made to improve their nutrition and body condition scores. This study emphasizes the significance of oral health in horses and the impact of regular dental care on their overall well-being.
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Clemen, Günter, and Hartmut Greven. "Sex dimorphic dentition and notes on the skull and hypbranchium in the hynobiid salamander Pachyhynobius shangchengensis FEI, QU & WU, 1983 (Urodela: Amphibia)." Vertebrate Zoology 59, no. 1 (2009): 61–69. http://dx.doi.org/10.3897/vz.59.e30952.
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A noticeable sex-dimorphic dentition is described in the hynobiid salamander Pachyhynobius shangchengensis. In the upper and lower jaw, the male possesses pedicellate teeth with a chisel- or spearhead-like crown, i.e. secondary (labial) cusps of teeth are largely reduced, whereas the primary (lingual) cusps are fl attened antero-posteriorly and exhibit sharp edges. In contrast, females have pedicellate, somewhat fl attened teeth more variable in shape, but with small bladed labial and large bladed lingual cusps. Vomeres of both sexes bear typical bicuspid, pedicellate teeth. Skulls including the hyobranchium are largely ossifi ed with some minor differences between males and females. However, females appear to lack the pars hypohyalis in the hyobranchial apparatus.
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Clemen, Günter, and Hartmut Greven. "Sex dimorphic dentition and notes on the skull and hypbranchium in the hynobiid salamander Pachyhynobius shangchengensis FEI, QU & WU, 1983 (Urodela: Amphibia)." Vertebrate Zoology 59 (May 15, 2009): 61–69. https://doi.org/10.3897/vz.59.e30952.
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A noticeable sex-dimorphic dentition is described in the hynobiid salamander Pachyhynobius shangchengensis. In the upper and lower jaw, the male possesses pedicellate teeth with a chisel- or spearhead-like crown, i.e. secondary (labial) cusps of teeth are largely reduced, whereas the primary (lingual) cusps are fl attened antero-posteriorly and exhibit sharp edges. In contrast, females have pedicellate, somewhat fl attened teeth more variable in shape, but with small bladed labial and large bladed lingual cusps. Vomeres of both sexes bear typical bicuspid, pedicellate teeth. Skulls including the hyobranchium are largely ossifi ed with some minor differences between males and females. However, females appear to lack the pars hypohyalis in the hyobranchial apparatus.
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Torkghashghaei, Maryam, William Shaffer, Bruna Ugulino, Rémi Georges, Roger E. Hernández, and Carl Blais. "Improved life of circular saws used in primary wood processing." BioResources 18, no. 1 (2023): 2024–44. http://dx.doi.org/10.15376/biores.18.1.2024-2044.
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The effects of the Engineered Micro-Geometry (EMG) of the carbide teeth of circular saws on their wear rate and resulting sawing variation for 2-time intervals were studied. The objective was to improve the wear resistance of circular saws used during the primary transformation of wood. The tests were carried out under industrial production conditions with two series of circular saws; 1- with up-sharp tips, and 2- with cutting edges honed to adopt a waterfall geometry. The duration of the tests was 255 min and 645 min. Wood studs were sampled to measure sawing variation. Recession on the rake and clearance faces of the tips as well as the width of the wear land were measured. The wear mechanisms of the cutting edges of both types of saws were studied. Chipping and cracking were the two dominant wear mechanisms observed on the up-sharp tips. Saws with waterfall hone tips showed remarkably reduced chipping and cracking. Wear rate of the latter was notably lower than that of saws with up-sharp tips at both periods of sawing. Between-stud, within-stud, and total sawing variations decreased when saws with modified cutting edges were used.
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Qi, Shuo, Jing-Song Shi, Yan-Bo Ma, et al. "A sheep in wolf's clothing: Elaphe xiphodonta sp. nov. (Squamata, Colubridae) and its possible mimicry to Protobothrops jerdonii." ZooKeys 1048 (July 6, 2021): 23–47. http://dx.doi.org/10.3897/zookeys.1048.65650.
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Based on combined morphological and osteological characters and molecular phylogenetics, we describe a new species of the genus Elaphe that was discovered from the south slope of the Qinling Mountains, Shaanxi, China, namely Elaphe xiphodontasp. nov. It is distinguished from the other congeners by a combination of the following characters: dorsal scales in 21-21-17 rows, the medial 11 rows keeled; 202–204 ventral scales, 67–68 subcaudals; two preoculars (including one subpreocular); two postoculars; two anterior temporals, three posterior temporals; reduced numbers of maxillary teeth (9+2) and dentary teeth (12); sharp cutting edges on the posterior or posterolateral surface of the rear maxillary teeth and dentary teeth; dorsal head yellow, three distinct markings on the head and neck; a distinct black labial spot present in supralabials; dorsum yellow, 46–49 complete (or incomplete) large black-edged reddish brown blotches on the body and 12–19 on the tail, two rows of smaller blotches on each ventrolateral side; ventral scales yellow with mottled irregular black blotches, a few irregular small red spots dispersed on the middle of the ventral. Based on molecular phylogenetic analyses, the new species forms the sister taxon to E. zoigeensis. The discovery of this new species increases the number of the recognized species in the genus Elaphe to 17.
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Evans, Alexandra M., Jonah N. Choiniere, and Graham J. Alexander. "The cutting-edge morphology of the mole snake’s dental apparatus." PeerJ 7 (June 7, 2019): e6943. http://dx.doi.org/10.7717/peerj.6943.
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The mole snake (Pseudaspis cana) is capable of inflicting unusual bites in defence and during male combat that present as two parallel lacerations. We investigated the dental morphology of the mole snake by making SEM images, and by CT-scanning and digitally reconstructing the skulls of 14 specimens comprising both sexes. The lengths, volumes, shapes and positions of maxillary and dentary teeth were compared within individuals, between individuals, and between sexes. CT reconstructions show the occurrence of large, flat triangular teeth at the posterior end of the maxilla that are angled to point towards the posterior of the skull. SEM imagery highlights the presence of sharp ridges (carinae) on the posterior edges of the posterior dentary and maxillary teeth. Males have greater dental specialization, maxillary tooth variation, enlargement of the posterior-most maxillary teeth, and dentary teeth with posterior carinae. We hypothesize that mole snake dental specializations are adaptations for their particular form of male combat and possibly for subduing prey in the confines of underground burrows. Our findings reveal a complex dental morphology in mole snakes and provide impetus for further studies on the functional morphology of snake teeth.
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Qi, Shuo, Jing-Song Shi, Yan-Bo Ma, et al. "A sheep in wolf's clothing: Elaphe xiphodonta sp. nov. (Squamata, Colubridae) and its possible mimicry to Protobothrops jerdonii." ZooKeys 1048 (July 6, 2021): 23–47. https://doi.org/10.3897/zookeys.1048.65650.
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Based on combined morphological and osteological characters and molecular phylogenetics, we describe a new species of the genus Elaphe that was discovered from the south slope of the Qinling Mountains, Shaanxi, China, namely Elaphe xiphodonta sp. nov. It is distinguished from the other congeners by a combination of the following characters: dorsal scales in 21-21-17 rows, the medial 11 rows keeled; 202–204 ventral scales, 67–68 subcaudals; two preoculars (including one subpreocular); two postoculars; two anterior temporals, three posterior temporals; reduced numbers of maxillary teeth (9+2) and dentary teeth (12); sharp cutting edges on the posterior or posterolateral surface of the rear maxillary teeth and dentary teeth; dorsal head yellow, three distinct markings on the head and neck; a distinct black labial spot present in supralabials; dorsum yellow, 46–49 complete (or incomplete) large black-edged reddish brown blotches on the body and 12–19 on the tail, two rows of smaller blotches on each ventrolateral side; ventral scales yellow with mottled irregular black blotches, a few irregular small red spots dispersed on the middle of the ventral. Based on molecular phylogenetic analyses, the new species forms the sister taxon to E. zoigeensis. The discovery of this new species increases the number of the recognized species in the genus Elaphe to 17.
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Siwińska, Natalia, Agnieszka Żak, Matylda Mańkowska, Michalina Drozd, and Hieronim Borowicz. "Frequency of dental problems in incisor teeth among horses in Poland." Medycyna Weterynaryjna 73, no. 6 (2017): 362–65. http://dx.doi.org/10.21521/mw.5704.
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The goal of this study was to determine the frequency of anomalies in incisor teeth depending on the horse’s age, sex, diet, diseases and floating frequency. A total of 255 horses from three Polish voivodeships, Kuyavian-Pomeranian, Greater Poland and Upper Silesia, were examined. The testing of incisor teeth was non-invasive and protocol-based. The most common defects were sharp edges of incisors in the maxilla and mandible, as well as a shortened mandible in relation to the maxilla. A relationship was proved between incisor anomalies and the horses’ age, floating frequency and bad habits. Anomalies of incisors are a common problem in horses in Poland, but they do not cause serious problems in the use of these animals.
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Mirdan, B. M., H. A. Jawad, D. Batani, V. Conte, T. Desai, and R. Jafer. "Surface morphology modifications of human teeth induced by a picosecond Nd:YAG laser operating at 532 nm." Laser and Particle Beams 27, no. 1 (2009): 103–8. http://dx.doi.org/10.1017/s0263034609000159.
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AbstractThe interaction of an Nd:YAG laser, operating at 532 nm with 40 ps pulse duration, with human teeth was studied. The results show that teeth were significantly modified at an energy fluence of about 11 J/cm2. Various surface morphologies of enamel and dentine were recorded. Features on enamel include crater (conical form) in the central part and cauliflower morphology at the periphery, whereas on dentine the crater looks like a stretched dome between sharp edges. The behavior of the enamel-dentine junction area showed different morphology with respect to both tooth enamel and dentine alone. Finally, the junction channel showed a removal of collagen fibers and the formation of a needle-like bottom structure. Generally, this investigation showed that the picosecond Nd:YAG laser can ablate a tooth surface practically instantaneously, implying that large tooth surfaces can be processed in short time.
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Harmaya, Putri Luthfiah, Muhammad Gilang Suryanata, and Khairi Ibnutama. "COMPARISON CANNY AND SOBEL METHODS DETECTING EDGES OF DENTAL CARIES." JURTEKSI (Jurnal Teknologi dan Sistem Informasi) 9, no. 4 (2023): 647–54. http://dx.doi.org/10.33330/jurteksi.v9i4.2565.
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Abstract: In the human body there are parts that act as tools for tearing and tearing food which are commonly called teeth, teeth are sharp and hard parts of the body. Dental caries is the medical term for cavities, dental caries is an infectious disease that damages the hard lining of the teeth. The presence of bacteria or germs found in the oral cavity causes cavities in the teeth. Medical images are useful for seeing the extent of the damage to cavities. Not all images have good quality detection results or have noise. Therefore, Image Processing is used by applying the Canny and Sobel method of edge detection to an image in order to process the results of segmentation and object identification in dental caries images. There are many operators in edge detection, including the Roberts Operator, Prewitt Operator, Laplacian Operator and Laplacian of Gaussian (LOG). The purpose and benefits of establishing an image processing application using Matlab software with the Canny and Sobel method to produce the appearance of an object's boundary line in an image. The results of this study can be concluded from the two operators regarding the advantages and disadvantages of the two operators. Keywords: dental caries; edge detection; image; matlab; canny method; sobel method Abstrak: Pada tubuh manusia ada bagian yang berperan sebagai alat untuk merobek dan mengoyak makanan yang biasa disebut dengan gigi, gigi merupakan bagian tubuh yang tajam dan keras. Karies gigi adalah istilah medis dari gigi berlubang, karies gigi merupakan penyakit infeksi yang merusak jaringan lapisan keras gigi. Adanya bakteri atau kuman yang terdapat pada rongga mulut menjadi penyebab gigi menjadi berlubang. Citra medis berguna untuk melihat sejauh apa kerusakan pada gigi yang berlubang. Tidak semua citra memiliki hasil pendeteksian yang bagus kualitasnya atau memiliki derau (noise). Oleh sebab itu digunakanlah Pengolahan Citra dengan menerapkan deteksi tepi metode Canny dan Sobel pada suatu citra guna untuk memproses hasil segmentasi dan identifikasi objek pada citra karies gigi. Ada banyak operator dalam deteki tepi, diantaranya yaitu, Operator Roberts, Operator Prewitt, Operator Laplacian dan Laplacian of Gaussian (LOG). Tujuan dan manfaat dari dibentuknya sebuah aplikasi pengolahan citra menggunakan software Matlab dengan metode Canny dan Sobel untuk menghasilkan penampakan garis batas suatu objek pada citra. Hasil dari penelitian ini dapat disimpulkan dari kedua operator mengenai kelebihan dan kekurangan dari kedua operator tersebut. Kata kunci: citra; deteksi tepi; karies gigi, matlab, metode canny, metode sobel
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Okhrimenko, Oleksandr, Vyacheslav Vovk, Serhii Maidaniuk, and Yuliia Lashyna. "Determining the width of a layer cut with saws with multidirectional teeth." Eastern-European Journal of Enterprise Technologies 3, no. 1 (111) (2021): 14–20. http://dx.doi.org/10.15587/1729-4061.2021.231779.
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To predict the workability of a tool structure at the design stage, it is necessary to calculate the parameters of the cut layer when this tool is used because the cut layer’s size determines the strength and dynamic characteristics of the cutting process. It is known that the size and shape of the cut layer are affected by the allowance cutting scheme embedded in the tool design. Therefore, the parameters of the cut layer with the tool must be investigated taking into consideration the actual shapes and location of the cutting edges of the tool teeth and the cutting scheme with individual teeth. Existing analytical dependences on determining the thickness of the cut layer do not take into consideration the group arrangement of the teeth, which have a different shape and location of their cutting edges. Therefore, a procedure for determining the thickness of the cut layer analytically has been proposed, using the example of circular saws with multidirectional teeth while taking into consideration the patterns in the arrangement of the cutting edges of individual teeth and the real movements of the tool during its operation. The proposed procedure makes it possible to determine the parameters of the layer cut with the tool at both constant and progressive allowance cutting schemes. One can also specify the parameters of the cut layer at any time of the tool’s operation and analyze the change in the shape of the slice in time. Based on the analysis of the parameters of the cut layer, it has been established that saws with multidirectional teeth do not work with the entire width of the cutting edge but only in its part, whose share does not exceed 55 % of the width of the tool. The procedure reported here could be used to determine the loading of the cutting tool part with a more complex cutting scheme, which also includes tools that are operated by the form-generating method
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Oleksandr, Okhrimenko, Vovk Vyacheslav, Maidaniuk Serhii, and Lashyna Yuliia. "Determining the width of a layer cut with saws with multidirectional teeth." Eastern-European Journal of Enterprise Technologies 3, no. 1 (111) (2021): 14–20. https://doi.org/10.15587/1729-4061.2021.231779.
Full textAbstract:
To predict the workability of a tool structure at the design stage, it is necessary to calculate the parameters of the cut layer when this tool is used because the cut layer’s size determines the strength and dynamic characteristics of the cutting process. It is known that the size and shape of the cut layer are affected by the allowance cutting scheme embedded in the tool design. Therefore, the parameters of the cut layer with the tool must be investigated taking into consideration the actual shapes and location of the cutting edges of the tool teeth and the cutting scheme with individual teeth. Existing analytical dependences on determining the thickness of the cut layer do not take into consideration the group arrangement of the teeth, which have a different shape and location of their cutting edges. Therefore, a procedure for determining the thickness of the cut layer analytically has been proposed, using the example of circular saws with multidirectional teeth while taking into consideration the patterns in the arrangement of the cutting edges of individual teeth and the real movements of the tool during its operation. The proposed procedure makes it possible to determine the parameters of the layer cut with the tool at both constant and progressive allowance cutting schemes. One can also specify the parameters of the cut layer at any time of the tool’s operation and analyze the change in the shape of the slice in time. Based on the analysis of the parameters of the cut layer, it has been established that saws with multidirectional teeth do not work with the entire width of the cutting edge but only in its part, whose share does not exceed 55 % of the width of the tool. The procedure reported here could be used to determine the loading of the cutting tool part with a more complex cutting scheme, which also includes tools that are operated by the form-generating method
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Miron, Mariana I., Ciprian T. Florea, Diana Lungeanu, and Carmen D. Todea. "Diagnostic Aspects of an Included Third Molar in an 88-Year-Old Patient: A Case Report and Literature Review." Diagnostics 12, no. 9 (2022): 2082. http://dx.doi.org/10.3390/diagnostics12092082.
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Included third molars in elderly patients are quite rare in dental practice, and therefore easily misdiagnosed, because these teeth are usually extracted in youth. Additional challenges to correctly diagnosing such a dental condition, and its associated complications, arise from frequent co-morbidities in elderly patients, and from difficult communication with the patient. We report a case of an 88-year-old female patient, who presented in the dental emergency room complaining of a discomfort caused by the sharp edges of her lower incisors, and requesting their extraction; the final diagnosis, of suppurated pericoronitis at tooth 48, was concluded based on the clinical elements and X-ray examination.
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Purushothaman, Akalya, Sahana N S, Chandrakala Jayaram, Savita S. Shiragur, Ninad V. Chavan, and Meghashyama Kulkarni. "Reactive lesions of oral cavity." Journal of Oral Medicine, Oral Surgery, Oral Pathology and Oral Radiology 9, no. 4 (2023): 175–82. http://dx.doi.org/10.18231/j.jooo.2023.039.
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Oral mucosa is constantly subjected to various external and internal stimuli that leads to various reactive lesions. They are non-neoplastic in nature, but clinically these lesions closely mimic benign neoplastic lesions leading the clinician to misdiagnosis and sub-optimal treatment. Reactive lesions are typically occurring as a response to chronic inflammation caused by various forms of low-grade chronic irritations to the oral mucosa such as dental plaque and calculus, sharp edges of grossly carious teeth, faulty dental restorations, chronic biting habits, ill-fitting dental/oral appliances and food impactions. This review article summarizes the various reactive lesions of oral cavity and their distinctive histopathologic features.
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Elvi, Elvi, Edy Machmud, Bahruddin Thalib, Armawati Arafi, and Indah Sulistiawaty. "Management of releasable full denture in patient with pseudo jaw relation class III: a case report." Journal of Dentomaxillofacial Science 2, no. 1 (2017): 76. http://dx.doi.org/10.15562/jdmfs.v2i1.453.
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Objective: To give information about management of releasable full denture in patient with pseudo jaw relation class IIIMethods: A 58 years old woman came with complaints that she could not chew food and felt shy when she laughed, the woman asked a denture made for her. Last tooth withdrawal was 3 months ago. Shape of upper jaw sharp edge is triangle (pointed alveolar ridge), while lower jaw sharp edge is in resorbtion condition. Making of denture was started with initial molding, physiology molding, bite determination, and teeth arrangement based on Lingualized occlusion to insertion.Results: A case with pseudo jaw relation class III successfully treated using denture with lingualized occlusion.Conclusion: Teeth arrangement using occlusion pattern Lingualized occlusion can give natural appearance to patient and stability of denture.
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Fang, Zichen, Long Cheng, Haishui Jiang, Xianlang Wu, Xulong Lai, and James G. Ogg. "First discovery of actinopterygian cutting-edged teeth from the middle Norian (Late Triassic) at the Tulong section, southern Tibet, China." PeerJ 12 (December 18, 2024): e18728. https://doi.org/10.7717/peerj.18728.
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Actinopterygians (ray-finned fishes) successfully passed through the Permian-Triassic Mass Extinction (PTME) and flourished in the Triassic with diverse feeding specializations and occupation of various trophic levels. Birgeria, one of the largest actinopterygian fish of the Triassic, was characterized by a strong, blunt rostrum and three rows of sharp cutting-edged teeth, making them the top predators in the Early Mesozoic oceanic ecosystem. These fishes rapidly radiated and diversified globally during the Early and Middle Triassic, but the fossil record is rare for the Neo-Tethys in the Late Triassic. Here, we report new actinopterygian teeth with cutting edges from Norian-age strata in the Tulong section, which was located on the northern margin of the Indian Plate at that time. The tooth features, such as the polished acrodin cap, the ratio of the acrodin cap in length, and the tiny vertical striae at the tooth base, suggest an affinity with Birgeria, which is reported in this region for the first time. Furthermore, we infer that the carnivorous Birgeria, which co-occurred with the enigmatic ichthyosaur Himalayasaurus tibetensis, played the role of predator in this part of the Neo-Tethys marine realm during the Late Triassic. These new findings increase the known diversity of actinopterygians during the Late Triassic and provide further insight into the marine fauna of this epoch.
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ANKER, ARTHUR, and SAMMY DE GRAVE. "Opaepupu, a new genus and species of bivalve-associated shrimp (Decapoda: Caridea: Palaemonidae) from Hawai’i." Zootaxa 4903, no. 1 (2021): 55–70. http://dx.doi.org/10.11646/zootaxa.4903.1.3.
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A new palaemonid shrimp genus, Opaepupu gen. nov., is established to accommodate a new species of bivalve-associated shrimp, Opaepupu huna sp. nov. from Hawaii. A single mated pair, the female holotype and the male allotype, were found inside the trapezid bivalve Trapezium oblongum (Linnaeus, 1758) at a depth of 14 m in Kâne’ohe Bay, Hawai’i. The new genus is characterised by the rostrum being proximally broad, distally pointed, mid-dorsally carinate, and non-dentate; the anterolateral margin of the carapace without supraorbital, hepatic or epigastric teeth, but with a strong sharp antennal tooth; the sixth pleonite posteriorly unarmed; the telson medially depressed, with the dorsal surface armed with two pairs of submarginal cuspidate setae and with the posterior margin armed with two pairs of spiniform setae; the distolateral angle of the first article of the antennular peduncle without a sharp tooth; the mandible without a palp; the maxillular palp furnished with one long stiff seta dorsal to a small tooth-like extension; the first maxilliped without a palp; the third maxilliped not being operculate; the second pereiopods moderately robust, relatively slender, subequal, subsymmetrical, with simple teeth on the cutting edges of the fingers; the ambulatory pereiopods being slender, each ending in an elongate biunguiculate dactylus; and the uropodal exopod with a faint diaeresis and greatly reduced distolateral spiniform seta. The phylogenetic position of Opaepupu gen. nov. remains unclear, although it does not appear to be closely related to other bivalve-associated palaemonid genera.
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Зиновенко, О. Г., И. Л. Бобкова, И. В. Садовская, М. В. Щинкевич, and Т. К. Барауля. "Dental Status of Patients with Manifestations of Lichen Planus in the Oral Cavity." Стоматология. Эстетика. Инновации 7, no. 2 (2023): 183–87. http://dx.doi.org/10.34883/pi.2023.7.2.004.
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В исследовании проведено изучение стоматологического статуса пациентов с проявлениями плоского лишая на слизистой рта. Практически каждый второй обследуемый пациент имел неудовлетворительные пломбы (48,9%) и ортопедические конструкции в ротовой полости из разнородных металлов (48,2%). Несостоятельные искусственные коронки, мостовидные протезы были выявлены в 66,4% случаев. Острые края коронок зубов при неравномерном стирании в 39,4% случаев и разрушенные кариозные зубы с острыми краями в 37,2% случаев также являются значимыми травмирующими факторами развития и прогрессирования данной патологии в ротовой полости. Практически каждый пятый обследуемый пациент имел несостоятельные съемные ортопедические конструкции (19,7%) и зубы, расположенные вне зубной дуги (19%). Большое практическое значение имеет тот факт, что при поражении плоским лишаем для слизистой оболочки рта характерна значительно более высокая ранимость. При данном заболевании присутствует положительный симптом (феномен) Кебнера, а именно появление свежих высыпаний на месте раздражения, наблюдающееся в острой (прогрессирующей) фазе. Все вышеперечисленное свидетельствует о значимости устранения местных раздражающих факторов в ротовой полости, а также профилактики их возникновения. The study examined the dental status of patients with manifestations of lichen planus on the oral mucosa. Almost every second examined patient had unsatisfactory fillings (48,9%) and orthopedic structures in the oral cavity made of dissimilar metals (48,2%). Failed artificial crowns and bridges were identified in 66,4% of cases. Sharp edges of dental crowns with uneven erasure in 39,4% of cases and destroyed carious teeth with sharp edges in 37,2% of cases are also significant traumatic factors of the development and progression of this pathology in the oral cavity. Almost every fifth examined patient had untenable removable orthopedic structures (19,7%) and teeth located outside the dental arch (19%). Of great practical importance is the fact that when affected by lichen planus, the oral mucosa is characterized by a much higher vulnerability. With this disease, there is a positive symptom (phenomenon) Koebner, namely the appearance of fresh rashes at the site of irritation, observed in the acute (progressive) phase. All of the above indicates the importance of eliminating local irritating factors in the oral cavity, as well as preventing their occurrence.
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Hsu, Hsiang Chen, Hsi Chien Liu, and Cheng Jiun Han. "Fabrication of Microfluidic Rapid Micromixer." Key Engineering Materials 467-469 (February 2011): 2013–17. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.2013.
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A microfluidic multi-cylindric rapid micromixer is fabricated in the present paper. The key features in the presented MEMS-based microchannel design are (1) micro pump (2) Y-junction type channel (3) cylindric obstacle (4) notch with the edge of sharp teeth. Two different fluids (DI water and red ink) were pumped and injected into Y-type channel, and the fluids were broken-up by a cylindric obstacle in the center of tapered microchannel. The chaotic convection occurs in the mixing channel behind the cylindric obstacle. The mixing index is defined to qualify the mixing efficiency, which demonstrates the outlet notch with sharp teeth along the sidewall plays an important role for mixing effects. The developed micromixer can enhance mixing using the mechanisms of diffusion and convection for wide range of Reynolds number (0.01<Re<100). Parametric studies for volumetric flow rate include the number of cylindric obstacles, the number of notches with sharp-teeth and the width of microchannel. Preliminary results demonstrate that the mixing index reaches the desired effect (<0.1) within 0.08 second when the inlet fluid velocity is 0.49992m/s, i.e. volumetric flow rate is 1200μl /min. The presented device is faster than most of reported micromixers.
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Ochilova, G. S. "Treatment and prevention of chronic catarrhal gingivitis." Integrative dentistry and maxillofacial surgery 1, no. 2 (2022): 142–44. http://dx.doi.org/10.57231/j.idmfs.2022.1.2.022.
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This disease is the most common form of gum inflammation, which occurs as a result of the pathogenic effects of microorganisms present in the gingival plaque. At the same time, the capillaries of the gum are in the center of the pathological process, and the teeth retain their stability.According to the scale of inflammation, the disease can be localized or generalized. Chronic generalized catarrhal gingivitis engulfs the gum along the entire length on one or both jaws, while localized spreads only in the area of 1-2 teeth. The cause of localized gingivitis is more often the overhanging edge of the filling, the sharp edge of a destroyed tooth or prosthesis.
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Makeeva, I. M., V. E. Komogortseva, I. V. Reshetov, E. G. Margaryan, V. A. Put, and A. G. Kadzhoyan. "Oral status of patients in need of cancer chemotherapy." Medical alphabet, no. 22 (October 15, 2022): 32–37. http://dx.doi.org/10.33667/2078-5631-2022-22-32-37.
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The prevalence and detection of cancer in the world is steadily increasing. The most common methods of treating malignant neoplasms are chemotherapy and/or radiation therapy. Patients undergoing this treatment often experience oral complications. The most common complication is oral mucositis. According to the literature, the probability of its occurrence is from 20 to 80% [2, 3]. Oral mucositis and other complications have a negative impact on the quality of life of cancer patients. They face pain, difficulty eating, swallowing, and damage to the oral mucosa increase the risk of secondary infection.Aim. Evaluation of the dental status of oncological patients starting chemotherapy treatment.Material and methods. The study involved 94 patients aged 45 to 59, who were divided into three groups: 1 – malignant neoplasms of the maxillofacial region (n = 23), 2 – gastrointestinal tract (n = 39), 3 – breast (n = 32). To determine the dental status, the values of the DFM, PMA, OHI-s indices, as well as local factors contributing to the aggravation of the oral cavity (metal structures, sharp edges of the teeth) were studied. To assess the awareness of patients about the rules and methods of maintaining an individual hygienic state of the oral cavity, a survey of patients was conducted.Results. The dental status of cancer patients was assessed. The average value of the DFM index in group I is 13.3 (high), in group II – 11.4 (high), in group III – 5.7 (medium). The average value of the OHI-S index in group I was 3.8 (poor), in group II it was 3.1 (poor), in group III it was 1.7 (poor). The average value of the PMA index in group I was 67 (severe degree of inflammation), in group II – 55.6 (moderate degree of inflammation), in group III – 30.8 (moderate degree of inflammation). According to the survey, low awareness of patients about the means and methods of monitoring individual oral hygiene was revealed. Risk factors have been identified in the form of sharp edges of teeth and metal structures that can contribute to the development of severe complications from the oral cavity during chemotherapy treatment.Conclusion. According to the results of the study, an unsatisfactory dental status of patients with oncological diseases of various localization was revealed. The need for control by dentists is shown.
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Alvarado-Ortega, Jesús, and Héctor Gerardo Porras-Múzquiz. "On the presence of Xiphactinus (Teleostei, Ichthyodectiformes) in the Coniacian-Campanian marine deposits of the Piedritas site, Coahuila, northern Mexico." Revista Mexicana de Ciencias Geológicas 39, no. 2 (2022): 142–50. http://dx.doi.org/10.22201/cgeo.20072902e.2022.2.1684.
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The discovery of the first Mexican fossil specimen belonging to the species Xiphactinus audax is reported here. This specimen was recovered in the Coniacian-Campanian marine deposits of the Austin Group at the Piedritas site, within the homonymous ejido, Municipality of Ocampo, north of Coahuila. Although the specimen is strongly fragmentary, partially preserved by impressions or molds of the bones, and only shows parts of the head, the opercular series, and the pectoral fins, this has enough anatomical features that allow its specific taxonomic determination. Among these diagnostic features, this fossil has a well-developed ethmopalatine bone, a well-developed supraoccipital crest, a maxilla anteriorly higher than the rest of the bone, and a very robust palatine articular head. Particularly, this fossil exhibits two distinctive features of the genus Xiphactinus, a row of conical teeth, irregularly sized and distributed in the maxilla and dentary bones, as well as a pectoral radius 1 extremely developed and at least 2.5 times wider than the subsequent ray. At the same time, its teeth are smooth and have no sharp edges or carenae, which allows its specific identification. The present discovery complements the geographical distribution of Xiphactinus confirming its wide longitudinal distribution throughout America.
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Vatu, Mihaela, Daniela Vintilă, Dragos Laurentiu Popa, Rodica Mercuţ, Sanda Mihaela Popescu, and Georgiana Vintila. "Determining Mechanical Causes that Produce Dental Wear Using Finite Element Method." Applied Mechanics and Materials 896 (February 2020): 15–22. http://dx.doi.org/10.4028/www.scientific.net/amm.896.15.
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Dental wear has accompanied human evolution, being strictly related to its way of life. Dental wear is a lesion of dental hard tissue commonly found in dental practice. Starting from the virtual skull model, the virtual models of the two upper premolars on the left hemisphere were generated, then the finite element method evaluated the stresses, displacements and strains generated by the resistance forces from the dental tissues of the two premolars during mandibular movements with occlusal contact. It is found that the value of these results increases as dental wear increases. This phenomenon is more visible in the teeth where the value almost doubles. Two explanations could be given for this situation: mechanically, these stresses are inversely proportional to the volume of the dental structures and, as they reduce, through dental wear, increase the stress, also, the sharp edges resulting from dental wear are mechanical stress concentrators.
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Setiadhi, Riani, and Kosterman Usri. "Oral Lesion Caused by Improper Removable Partial Denture." Jurnal Material Kedokteran Gigi 7, no. 1 (2018): 12. http://dx.doi.org/10.32793/jmkg.v7i1.275.
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Oral lesions are relatively common findings in clinical practice, can occur due to various factors such as trauma, systemic diseases, autoimmune disorders, malignancies. Local trauma as one of the cause of oral lesions majority due to poor dentures, fractured restorations and sharp edges of teeth. The lesions are commonly found on the mucosa that is subjected to the source of trauma such as buccal mucosa, lateral border of the tongue or lips. Removable partial denture is a denture that can be removed and reinserted without professional help. Poor removable denture which is an ill-fitting denture, rough/sharp/overextended flanges, or lack of retention/stability could cause oral lesions. This case report describes a 76 old year man complained of pain on his right lateral tongue since 6 months ago. He was wearing a removable upper right denture which cannot be remove for about a year. It was a rough and sharp self-curing acrylic denture. There was erythematous and pain on his lateral right of the tongue but no induration on palpation. Triamcinolone acetonide 0,1% in orabase was the given treatment for the right lateral of the tongue and referred him to the prosthodontic department for replacing the denture. The oral lesion was healed after one week of treatment and the poor denture was removed. As a conclusion dentures should be made properly by the expert in order to prevent oral lesions.
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Kochurova, E. V., A. A. Mukhanov, E. O. Kudasova, A. S. Utyuzh, and A. V. Yumashev. "THE SPECIFICITY OF THE DENTAL STATUS IN PATIENTS WITH SQUAMOUS CELL CARCINOMA OF THE ORAL CAVITY." Russian Journal of Dentistry 21, no. 2 (2017): 117–20. http://dx.doi.org/10.18821/1728-28022017;21(2):117-120.
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In this article considered the current vision of the problem of the influence of dental status in patients on the occurrence and/or development of squamous cell carcinoma (SCC) of the mucous membrane of the mouth (MMOC). On the basis of the some studies have noted a relationship between low level of the oral hygiene and the sharp edges of the teeth or dentures and the risk of developing this disease. Also revealed a correlation between periodontal disease and the possible development of SCC MMOC that corresponds to the main prediction about the risk of the development of this pathology on the background of the effects of chronical infection in the oral cavity. Significant correlation between the presence of carious lesions and the risk of developing SCC MNOC in contrast, is not detected. But clearly expressed role in the development of the cancers are galvanism and precancerous diseases of the oral mucous membrane and the red border of the lips.
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Abler, William L. "The Serrated Teeth of Tyrannosaurid Dinosaurs, and Biting Structures in Other Animals." Paleobiology 18, no. 2 (1992): 161–83. http://dx.doi.org/10.1017/s0094837300013956.
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The function of serrated teeth is analyzed by experimental comparison with the action of artificially made steel blades. Serrated blades cut compliant materials with a grip-and-rip mechanism, whereas smooth, sharp blades cut by concentrating a large downward force on a tiny area.Tyrannosaurid teeth from the Cretaceous Judith River Formation bear rows of serrations that have thick, rounded enamel caps, gripping slots between neighboring serrations, thick enamel bodies inside the teeth underneath the gripping slots, and a root beneath each serration. In contrast, the carnivorous dinosaur Troodon has teeth with exposed pointed serrations, thin enamel, and possibly serration roots.Serrations on the teeth of Troodon and the fossil shark Carcharodon, cut compliant materials in the same way as a serrated hacksaw blade. In contrast, the cutting action of tyrannosaurid teeth most closely resembles that of a dull smooth blade. The spaces between the serrations act as minute frictional vises that grip and hold meat fibers; chambers between neighboring serrations receive and retain small fragments of meat, and inevitably would have acted as havens where bacteria could be stored. These spaces may therefore have led to infections in wounds, analogous to those inflicted by the living Komodo dragon or ora. By analogy, the hunting and feeding behavior of tyrannosaurs may have resembled that of the ora.Serrations and slots are widely distributed among cutting devices in the natural world, and many of these deserve further study. For example, the carnassial teeth of mammalian carnivores cut by a combination of static force at the cutting edge, a crushing or scissoring action at the advancing junction between upper and lower teeth, and by lateral gripping and compression in a slot, like that seen on a much smaller scale in tyrannosaurid serrations. Mammalian teeth operate well only when deployed with sophisticated control over jaw movement, however, and the fine neural control necessary to operate them may have formed the basis for the later development of intelligence in mammals.Previously, being interested in mammals was largely a matter of being interested in teeth, whereas being interested in reptiles was largely a matter of being interested in everything but teeth. I suggest that the teeth of at least some reptiles are as rich in information as the teeth of any mammals.
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Paramita, Annisa Listya. "Long Term Evaluation of Anterior Primary Resin Crown in Pediatric Patient." DENTA 11, no. 2 (2019): 98. http://dx.doi.org/10.30649/denta.v11i2.103.
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<p><strong><em>Background: </em></strong><em>Nursing bottle carries is a problematic condition in children. On one side, parents try to supply enough nutrition to their children, though on the other side this night-time bottle feeding habit might cause negative effect on the childrens dental health. Esthetic dental treatment on children have improved greatly over the past few years, as parents expect an almost-complete restoration of their child’s dental condition. The alternatives for pediatrics esthetic dental restoration may depend on the cooperativeness and habit of the child themselves</em><em>, while also taking the child’s development into consideration. <strong>Aim:</strong> to report evaluation of aesthetic restoration on primary teeth. <strong>Case:</strong> A 4 year-old female child was presented by her parents, with damaged four anterior teeth, which made her uncomfortable especially on feeding due to the sharp edges. From history taking we found a night-time bottle-feeding habit, which usually occurred until patient was asleep. <strong>Case Management:</strong> restoration of the four primary incisive teeth was performed using a resin composite crown. Outcome of the treatment was evaluated until the primary teeth exfoliateand permanent teeth arise. <strong>Conclusion:</strong> cooperation between patient, parents, and dentist is important in the dental restorative treatment on paediatric patient. Moreover, a good communication with parents is encouraged, especially on follow-up schedule, treatment cost, success rate and possibility of treatment failure is also encouraged. Staged evaluation is needed due to the natural substitution of the primary teeth by permanent teeth, besides the development process of the jaws.</em></p><p><strong><em>Keywords:</em></strong><em> Nursing bottle caries, esthetic restoration</em>, <em>growthanddevelopment</em></p><p><strong><em>Correspondence</em></strong><strong>: </strong><em>Annisa Listya Paramita, drg., Sp.KGA. Departemen Ilmu Kedokteran Gigi Anak. Fakultas Kedokteran Gigi Universitas Hang Tuah, Surabaya. Jl. Arif Rahman Hakim No. 150, Surabaya. </em></p>
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Berio, Fidji, Yann Bayle, Daniel Baum, Nicolas Goudemand, and Mélanie Debiais-Thibaud. "Hide and seek shark teeth in Random Forests: machine learning applied to Scyliorhinus canicula populations." PeerJ 10 (July 4, 2022): e13575. http://dx.doi.org/10.7717/peerj.13575.
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Shark populations that are distributed alongside a latitudinal gradient often display body size differences at sexual maturity and vicariance patterns related to their number of tooth files. Previous works have demonstrated that Scyliorhinus canicula populations differ between the northeastern Atlantic Ocean and the Mediterranean Sea based on biological features and genetic analysis. In this study, we sample more than 3,000 teeth from 56 S. canicula specimens caught incidentally off Roscoff and Banyuls-sur-Mer. We investigate population differences based on tooth shape and form by using two approaches. Classification results show that the classical geometric morphometric framework is outperformed by an original Random Forests-based framework. Visually, both S. canicula populations share similar ontogenetic trends and timing of gynandric heterodonty emergence but the Atlantic population has bigger, blunter teeth, and less numerous accessory cusps than the Mediterranean population. According to the models, the populations are best differentiated based on their lateral tooth edges, which bear accessory cusps, and the tooth centroid sizes significantly improve classification performances. The differences observed are discussed in light of dietary and behavioural habits of the populations considered. The method proposed in this study could be further adapted to complement DNA analyses to identify shark species or populations based on tooth morphologies. This process would be of particular interest for fisheries management and identification of shark fossils.
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Chai, Herzl. "Modelling edge chipping in flint knapping, cutting tools and sharp teeth using a trapezoidal prism structure." International Journal of Solids and Structures 104-105 (January 2017): 1–7. http://dx.doi.org/10.1016/j.ijsolstr.2016.11.011.
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Turkyilmaz, Ilser, Gregory Neil Wilkins, and Sarah Yun. "Moving from analogue to digital workflows in dentistry: Understanding undermilling and overmilling as detrimental factors in fabricating CAD/CAM crowns." Primary Dental Journal 11, no. 2 (2022): 59–61. http://dx.doi.org/10.1177/20501684221100938.
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Due to the limitations caused by the specific dimensions of milling burs, milling machines may inaccurately fabricate restorations by either over-reducing or under-reducing restorative material, respectively known as “overmilling” and “undermilling”. Overmilling occurs when the bur is unable to accommodate areas smaller than the size of the bur, especially at cusp tips and sharp line angles. This results in excess cement space and a weaker restoration. Undermilling occurs when small concavities are ignored by the larger milling bur, particularly at the margins. This results in inadequate seating of the restoration and open margins due to premature binding, which can lead to restorative failure. To prevent these processing errors, clinicians should ensure that all incisal edges and cusp tips are flattened and rounded, verify that there are no undercuts, and prepare teeth with 1mm thick, smooth finish lines. Furthermore, clinicians may use the preparation check and milling simulation step of computer-aided design/computer-aided manufacturing (CAD/CAM) software to confirm the preparation is adequate and the restorative design does not have potential areas that will lead to overmilling.
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Jones, Marc E. H., Peter W. Lucas, Abigail S. Tucker, et al. "Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile." Journal of The Royal Society Interface 15, no. 143 (2018): 20180039. http://dx.doi.org/10.1098/rsif.2018.0039.
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Eilenodontines are one of the oldest radiation of herbivorous lepidosaurs (snakes, lizards and tuatara) characterized by batteries of wide teeth with thick enamel that bear mammal-like wear facets. Unlike most reptiles, eilenodontines have limited tooth replacement, making dental longevity particularly important to them. We use both X-ray and neutron computed tomography to examine a fossil tooth from the eilenodontine Eilenodon (Late Jurassic, USA). Of the two approaches, neutron tomography was more successful and facilitated measurements of enamel thickness and distribution. We find the enamel thickness to be regionally variable, thin near the cusp tip (0.10 mm) but thicker around the base (0.15–0.30 mm) and notably greater than that of other rhynchocephalians such as the extant Sphenodon (0.08–0.14 mm). The thick enamel in Eilenodon would permit greater loading, extend tooth lifespan and facilitate the establishment of wear facets that have sharp edges for orally processing plant material such as horsetails ( Equisetum ). The shape of the enamel dentine junction indicates that tooth development in Eilenodon and Sphenodon involved similar folding of the epithelium but different ameloblast activity.
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Tashtemirov, Ravshanbek Matlyubovich, and Jahongir To'lqinjon o'gli Chinmurodov. "ETIOLOGY, CLINIC, DIAGNOSIS AND PREVENTION OF ORAL INJURIES IN SPORT HORSES." Bulletin of vetinary and livestock 3, no. 1 (2023): 3. https://doi.org/10.5281/zenodo.7816543.
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Based on the analysis of the literature, this article provides information on the etiology, diagnosis, treatment and prevention of oral injuries in horses that cause serious harm to equestrian sport in our republic.
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Makedonova, Yu A., S. V. Poroyskiy, L. M. Gavrikova, О. Yu Afanaseva, S. V. Dyachenko, and E. S. Aleksandrina. "Comparative analysis of the effectiveness of the oral mucosa traumatic lesion treatment in patients with a comorbidity." Parodontologiya 26, no. 3 (2021): 229–33. http://dx.doi.org/10.33925/1683-3759-2021-26-3-229-233.
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Relevance. Patients with diabetes are prone to complications which negatively affect their quality of life. In such patients, several comorbidities may develop. One of the complications of diabetes mellitus is an impaired wound healing. Oral wound healing associated with the constant chronic trauma by sharp edges of teeth and prostheses is not an exception. Such wounds are characterized by a long, persistent, sluggish process of restoring the integrity of the oral mucosa epithelium.Materials and methods. In this paper, a comparative analysis of the effectiveness of wound treatment was carried out in 52 patients with diabetes mellitus. All patients were randomized into two equal groups. In the first group of patients, wounds were treated with traditional methods of pharmacotherapy, while in the second group, the oral mucosa was exposed to ozone and ozonated oil was applied. The patients were monitored and followed up for 14 days and as the reparative function was restored. The area and depth of the wound, the nature and amount of exudate, destruction, the edges of the wound and the surrounding connective tissue were taken into account.Results. The positive wound healing process was noted in both groups during the follow-up period. However, the inclusion of the ozone therapy in the treatment protocol favored faster restoration of the epithelium integrity.Conclusion. The present data will help dentists monitor and treat the wound process, which in turn will prevent malignancy as well as improve the prognosis for patients with diabetes.
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Rougeot, R., and C. Aime. "Theoretical performance of serrated external occulters for solar coronagraphy." Astronomy & Astrophysics 612 (April 2018): A80. http://dx.doi.org/10.1051/0004-6361/201732512.
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Context. This study is made in the context of the future solar coronagraph ASPIICS of the ESA formation-flying mission Proba-3. Aims. In the context of solar coronagraphy, we provide a comparative study of the theoretical performance of serrated (or toothed) external occulters by varying the number and size of the teeth, which we compare to the sharp-edged and apodized disks. The tooth height is small (a few centimeters), to avoid hindering the observation of the solar corona near the limb. We first analyze the diffraction pattern produced by such occulters. In a second step, we compute the umbra profile by integration over the Sun. Methods. We explored a few methods to compute the diffraction pattern. Two of them were implemented. The first is based on 2D fast Fourier transformation (FFT) routines and a multiplication by the Fresnel filter of the form exp(−iπλzu2). Simple rules were derived and discussed to set the sampling conditions. The Maggi–Rubinowicz representation is then proposed as an alternative method, and is proven to be very efficient for this study. Results. Serrated occulters tend to create a two-level intensity pattern, the inner being the darker, which perfectly matches a previously reported geometrical prediction. The diffraction in this central region is lower by two to four orders of magnitude when compared to the sharp-edged disk. The achieved umbra level at the center ranges from 10−4 to below 10−7, depending on the geometry of the teeth. Conclusions. Our study shows that serrated occulters can achieve a high rejection and can almost reach the performance of the apodized disk when very many teeth are used. We prove that shaped occulters must be preferred to simple disks in solar and stellar coronagraphy.
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Yu, Jianjun. "Paper-Cutting Pattern Design Based on Image Restoration Technology." Security and Communication Networks 2022 (July 11, 2022): 1–9. http://dx.doi.org/10.1155/2022/3132047.
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Paper-cutting is one of the valuable intangible cultural heritages of China, with distinctive features such as “round as the autumn moon, sharp as the wheat mane, square as the green brick, missing as the serrated teeth, and thread as the beard,” and is a widely spread folk art. The art of paper-cutting brings new inspiration to the design of structures, and by changing the topology of the raw material, the material/structure can undergo significant changes in physical properties, such as optical, thermal, acoustic, and mechanical aspects. The protection of intangible cultural heritage is a process of cultural self-awareness and a kind of cultural reflection and enlightenment. In the history of promoting socialist cultural development, the protection of “intangible heritage” paper-cutting is undoubtedly of great significance. The purpose of digital image repair is to restore the integrity of the broken image, and the process is to fill in the specified area of the digital image with information, requiring a natural transition between the filled area and the original area of the image and minimizing artificial traces, so that the image looks as if it has never been broken. In this paper, the paper-cutting pattern design method based on image restoration technology is investigated, starting from the preprocessing of paper-cutting images by acquiring the edges of the images and using the Criminisi image restoration algorithm with image broken edge reconstruction to realize the image broken edge reconstruction design of paper-cutting graphics. Therefore, the paper-cut graphics generated by the method in this paper are concise and coherent as a whole, which reduces the difficulty of paper-cut design while satisfying individual design requirements.
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Bobkova, І., V. Burianova, O. Dunaievska, K. Uminska, and V. Khranivska. "MORPHOLOGICAL FEATURES OF SOME REPRESENTATIVES OF THE GENUS MENTHA L." Fitoterapia 3, no. 3 (2021): 39–44. http://dx.doi.org/10.33617/2522-9680-2021-3-39.
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Keywords: Mentha L., Mentha arvensis L., Mentha longifolia L., morphological, macroscopic and microscopic features. Background. The medicine in Ukraine widely uses peppermint leaves and their hybrids as vegetable raw materials. The fieldmint, Mentha arvensis L., and horsemint, Mentha longifolia L., are ofscientific interest. They are wide spread in Ukraine, resistant to disease, have a significant raw material base. The aim of the study. Identification of the main interspecific differences between field and long-leaf mint or horsemint and peppermint. Materials and methods of research. The morphological examination was performed on live and dried plant samples. The anatomical structure was established on the preparations from the surface. The Micromed XS 2610 biological microscope with magnification from (x10) to (x100) was used to study the anatomical and diagnostic features. Results and discussion. Representatives of the genus Mentha L. have both common and distinctive features. The pube scence, the nature of the margin, and the ratio of the length of the teeth to the calyx tube are different and canbe a diagnosticsign in identifying different types of mint in culture and in the wild. In field mint, the teeth are broadly triangular, obtuse, 3 times shorter than the tube, in horsemint, the teeth are linear-pointed, almost equalin length to the tube. The shape, size, base, edge and top of the leaf blade differed. Thus, in field mint form is ovoidoroblong- elliptical, the base is round, coreorwedge-shaped, the edge is serrated, the tip is sharp, the surface is bare, in long-leaved mint - oblongovoid, rounded, unevenly to othed, sharp, pubescent, respectively. According to the results of microscopican alysis, it was found that in the field mint on the edge of the leaf blade are simple 1-6 cellhairs; numerous 4-6 cellhairs are observed on the entire surface of the leaf blade, including veins. Horsemint has unicellular papillary hairs allover the leaf surface. Clusters of simple 1-4 cell hairs are observed along the edge of the leaf, simple hairs in long-leaved mint are much smaller than in other types of mint. Conclusions. Morphological and anatomical studies of plants of the genus Mentha L.: mint and mint have identified the main morphological specific features that will allow their identification.
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Pacheco Ordaz, Stephanie, Alvaro Reyes-López, and Jesús Alvarado-Ortega. "A Turonian pycnodontiform fish from the San José de Gracia Quarry, Puebla, Mexico." Boletín de la Sociedad Geológica Mexicana 77, no. 1 (2025): A241224. https://doi.org/10.18268/bsgm2025v77n1a241224.
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We report the presence of pycnodontiform fishes in the Turonian marine deposits of the Mexcala Formation, exposed in the San José de Gracia Quarry in the Municipality of Molcaxac, Puebla, central Mexico. This report includes a complete, articulated, and superficially poorly preserved specimen. This specimen has some peculiar osteological features for example: the supraorbital skull region is peculiarly prominent and rounded; its neural and hemal arcocentra have long, sharp lateral flanges that interlock with those of the contiguous arcocentra, forming tight and complex zigzagging suture; and its vomerine and pre-articular teeth have a flat and concave medial surface and lateral edges with aligned serrations and cusps. These along with other features are sufficient to allow us to conclusively identify this fish as a member of the order Pycnodontiformes, suborder Pycnodontoidei, family Pycnodontidae, and subfamily Nursalliinae. Comparison of the species within the subfamily allows us to identify the specimen of San José de Gracia as Paranursallia gutturosa, previously only known from northwestern Africa. In Addition, similar fossil fishes of the Agua Nueva Formation, previously recovered at sites such as the Vallecillo quarries in Nuevo León, Huehuetla in Puebla, and Xilitla in San Luis Potosí, suggest that these represent the same species.
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Oukerroum, Abdelhakim, Fatima Zahra Elfatoiki, Fouzia Hali, Faical Slimani, and Soumiya Chiheb. "Uncommon sublingual ulceration in an infant." Our Dermatology Online 13, no. 1 (2022): 103–4. http://dx.doi.org/10.7241/ourd.20221.27.
Full textAbstract:
Sir, An eight-month-old girl was referred to our department with an extensive lingual ulceration. The parents noted that she had habitually bitten her tongue since the release of her first teeth at the age of six months. She was a poor feeder and did not sleep well because of the painful lingual ulceration. There was no family history of developmental disorders or congenital syndromes. Intraoral examination revealed a deep, circular, and extensive ulceration of the whole ventral surface of the tongue with intermittent bleeding in the tongue (Figs. 1a – c). An examination of the rest of the intraoral mucosa revealed that the lower central incisors had recently erupted. However, there were two other ulcerations of the palmar surface of the second and third fingers caused by nocturnal finger biting. Neurological examination noted a lack of pain sensitivity related to peripheral neuropathy diagnosed as congenital insensitivity to pain. Based on the clinical features and the particular site on the ventral surface of the tongue against the lower central incisors and ulcerative lesions of the fingers due to self-biting, the lesion was diagnosed as Riga–Fede disease. Because of the size of the ulceration, significant pain during feeding led to inadequate nutrient intake associated with permanent sleep disturbances. Radical treatment was chosen and the lower central incisors were extracted. Topical corticosteroids were prescribed to help with healing. The term Riga–Fede disease has been used to describe a traumatic ulceration that has occurred on the ventral surface of the tongue in newborn babies and infants. It is most commonly related to neonatal or natal teeth but may also occur in infants after the eruption of the primary lower incisors [1]. This benign ulceration occurs as a result of repetitive mechanical trauma caused to the oral mucosal surfaces by the teeth and is most commonly located on the ventral surface of the tongue against the teeth [1,2]. Riga–Fede disease may reveal an underlying developmental or neurologic disorder, including congenital insensitivities to pain [3]. The case of our patient was associated with congenital insensitivity to pain. Failure to diagnose may lead to dehydration and inadequate nutrient intake in the infant because of the significant pain during feeding. No biopsy is needed. The diagnosis of Riga–Fede disease is based on clinical characteristics [1,2]. Treatment should focus on eliminating the source of trauma. Conservative treatment is attempted at first by grinding the sharp edges of the teeth and placing composite resin in a dome shape or by placing a protective ring. If conservative treatment fails to heal the wounds, radical treatment may be necessary, such as extraction of the teeth [2,3]. We believe that Riga–Fede disease must be recognized by clinicians to avoid misdiagnosis and delayed treatment.
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ASHRAFI, HOSSEIN, ALIREZA SARI, and REZA NADERLOO. "A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda: Caridea: Alpheidae) from the Persian Gulf." Zootaxa 4861, no. 3 (2020): 338–48. http://dx.doi.org/10.11646/zootaxa.4861.3.2.
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The present study is based on material collected in the intertidal and shallow subtidal areas of two Islands in the Persian Gulf, Abu-Musa and Larak. The new species, Synalpheus pentaspinosus n. sp., is closely related to S. quinquedens Tattersall, 1921. These two species share a very characteristic, sixth pleonite armed posteriorly with five stout sharp teeth, a feature unique within the genus. The color of ovaries or freshly laid eggs, red-orange in S. pentaspinosus n. sp. vs. green in S. quinquedens, is the most obvious character, by which the new species may be distinguished from S. quinquedens in the field. In addition, the two species can be separated by two characters on the dactylus of the minor cheliped. In the new species, the dactylus is furnished with two prominent rows of setae, one dorsally and one mesially, and has a small concavity on the cutting edge, contrasting to only one mesial row of setae and no obvious concavity in S. quinquedens.
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KIREJTSHUK, ALEXANDER G., CYRIL WILLIG, and PHILIPP E. CHETVERIKOV. "Discovery of a new sphindid genus (Coleoptera, Sphindidae, Protosphindinae) in Cretaceous amber of Northern Myanmar and taxonomic notes." Palaeoentomology 2, no. 6 (2019): 602–10. http://dx.doi.org/10.11646/palaeoentomology.2.6.11.
Full textAbstract:
Burmops neli gen. et sp. nov. is described from Cretaceous amber of Northern Myanmar, which is preliminarily assigned to the subfamily Protosphindinae Sen Gupta & Crowson, 1979 (family Sphindidae). This is the first record of the subfamily from the Mesozoic and the first in the fossil record at all. The new genus differs from the Recent Protosphindus Sen Gupta & Crowson, 1979 and Cretaceous Pleuroceratos Poinar & Kirejtshuk, 2008 (transferred here to the subfamily Protosphindinae) in the rather convex dorsum, head with peculiar pattern of above grooves and convexities, regular elytral punctation of longitudinal rows of very coarse punctures, non-explanate and gently undulate pronotal sides (without large teeth), sharp and subrectilinear longitudinal carinae and sharp carina along anterior edge of pronotum, and also rather projecting anterior edge of pronotum. New studies of additional specimens of Pleuroceratos burmiticus from Cretaceous amber of Northern Myanmar made it possible to establish a tentative position of this genus in the subfamily Protosphindinae, very similar and closely related to Protosphindus. The fossil record of this specialized beetle family can be considered as an indirect evidence of the presence of their food resource (slime molds) in Cretaceous ecosystems.
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Wang, Yan, Jolanta Brożek, and Wu Dai. "Comparative Morphology of the Mouthparts in Three Predatory Stink Bugs (Heteroptera: Asopinae) Reveals Feeding Specialization of Stylets and Sensilla." Insects 11, no. 11 (2020): 762. http://dx.doi.org/10.3390/insects11110762.
Full textAbstract:
Mouthpart structures were observed in three species of Asopinae using scanning electron microscopy to investigate their morphological disparity. The examined species attack mainly slow-moving, soft-bodied insects, primarily larval forms of the Lepidoptera, and are the natural enemies of many pests. This is the first detailed description of their external mouthparts. The triangular and elongated labrum and four-segmented tube-like labium are longer in Picromerus species (Picromerus bidens (Linnaeus, 1758) and Picromerus lewisi Scott, 1874 than in Cazira bhoutanica Schouteden, 1907. The labrum of P. lewisi and C. bhoutanica appear to be equipped with olfactory sensilla basiconica Sb3, a special type of sensilla with nanopores. The labium surface in all studied species bears 14 types of sensilla (St1–St4, Sb1–7, Sst, Sca1–2). A new characteristic of sensilla trichodea is represented in sensillum St1; in both Picromerus species, it is classified as an olfactory sensillum with nanopores. The tripartite apex of the labium consists of two lateral lobes and a central membranous lobe having microtrichial extensions. Each lobe has one sensory field, including sensilla basiconica (Sb7), sensilla styloconica (Sst), and sensilla trichodea (St4). In the three studied predatory stink bugs, each mandibular stylet tip has five irregular teeth and three long, pointed hooks. The two opposing maxillae, which are held together by a tongue-and-groove system, form a food canal and a salivary canal. The apices of the right maxilla have small teeth and few short barbs along the edge of the food canal. In P. bidens and P. lewisi, there are 5 teeth, while in C. bhoutanica there are 2. Based on structural differences, we inferred that the hook-shaped mandibular teeth, right maxilla with small teeth, and few short barbs along edge of the food canal are more adapted for a predatory lifestyle. Predatory stink bugs use sharp recurved hooks and irregular teeth penetrating, tearing, or filing devices that aid in the mechanical disruption of host tissue. Stiff bristles in the food canal may indicate their possible adaptation to feeding on insect larvae. The evolution of mouthpart morphology and the putative functional significance of sensilla are discussed, providing insight into the sensory mechanism.
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Salindeho, Indra Raymond, and Danielle Jane Johnston. "Functional morphology of the mouthparts and proventriculus of the rock crab Nectocarcinus tuberculosus (Decapoda: Portunidae)." Journal of the Marine Biological Association of the United Kingdom 83, no. 4 (2003): 821–34. http://dx.doi.org/10.1017/s0025315403007859h.
Full textAbstract:
Mouthpart and proventriculus structure of the brachyuran crab Nectocarcinus tuberculosus was described by scanning electron microscopy and histology and characteristics indicative of dietary preferences were identified. A qualitative stomach content analysis was conducted to verify structural interpretations with respect to diet. The mouthparts and proventriculus of N. tuberculosus have features that are typical of macrophagous crabs and are consistent with a carnivorous diet of hard items. However, the mandibular arrangement indicates that N. tuberculosus is also adapted to ingest soft plant material and fleshy items, revealing that this crab is omnivorous which is consistent with its habitat of rocky shores and sea grass beds. Carnivorous features of the feeding apparatus include large crista dentata on the third maxillipeds that grip food items during ingestion and cuspidate setae on the second maxillipeds and first maxillae. Nectocarcinus tuberculosus has a complex arrangement of proventricular ossicles, 5-denticulated accessory teeth, and a spiny cardio-pyloric valve with rough, calcified protuberances. It has a robust, strongly calcified gastric mill with a prominent anterior cusp and 11 roughly surfaced vertical ridges on each lateral tooth specialized for crushing and grinding. In contrast to true carnivorous crabs, the mandibles in this species are symmetrically arranged, with two sharp cutting edges and no teeth, an arrangement adapted to cut softer plant-like materials and flesh. Structural interpretations with respect to diet were confirmed by stomach content analysis where items identified included gastropods, bivalves and the sea grass Posidonia australis. Functionally, the filtering system in the proventriculus of N. tuberculosus is complex. The cardiac stomach has a well developed ventral filtration system or ‘cardiac filter’ which comprises coarse and fine filters. Different modifications of setation between the distal and proximal regions of the inner valve of the pyloric filter are unique to this crab species, with an intersetule width 600 nm in the distal region and 80–100 nm in the proximal region. This suggests that some differentiation in filtration occurs between regions within the pyloric filter.
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MURASAKI, KENTA, YOSHIAKI KAI, HIROMITSU ENDO, and ATSUSHI FUKUI. "Osteodiscus abyssicola, a new snailfish (Cottoidei: Liparidae) collected off the Pacific coast of northern Japan." Zootaxa 5032, no. 1 (2021): 136–42. http://dx.doi.org/10.11646/zootaxa.5032.1.8.
Full textAbstract:
The snailfish Osteodiscus abyssicola sp. nov. is described from a single specimen collected off the Pacific coast of Hokkaido, northern Japan, at a depth of 4,671–4,744 m. It is distinguished from all currently recognized congeners by the following combination of characters: vertebrae 49; dorsal-fin rays 44; anal-fin rays 39; principal caudal-fin rays 8; pyloric caeca 5; mouth horizontal; teeth on both jaws simple and sharp, without cusps; upper and lower jaw symphyses without diastema; cephalic pore sizes moderate, similar to or slightly larger than nostril; gill slit extending ventrally to 2nd pectoral-fin ray base; pectoral fin notched; mandibular symphysis to center of anus 101.6% head length (HL); posterior edge of pelvic disk to center of anus 15.5% HL; epural 1, reduced; epipleural ribs absent. An emended diagnosis and key to the species of Osteodiscus are provided.
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HEEMSTRA, PHILLIP C. "Gymnothorax hansi, a new species of moray eel (Teleostei: Anguilliformes: Muraenidae) from the Comoro Islands, Western Indian Ocean." Zootaxa 515, no. 1 (2004): 1. http://dx.doi.org/10.11646/zootaxa.515.1.1.
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Gymnothorax hansi, a new species of moray eel, is described from three specimens caught in ~ 146 m at Grand Comoro (Ngazidja) Island in the Comoros Islands. The length of the head plus the body is distinctly longer than tail; the dorsal fin origin is at a vertical midway between the gill opening and the rear edge of the eye. The head length is 11 to 12% total length. The colour is chestnut brown dorsally on the head, body and most of the tail; the dorsal and anal fins are brown anteriorly, blackish posteriorly with a bright white margin from dorsal fin origin round the tail tip to the anal fin origin; anterior nostril tube, posterior nostril mound and iris are yellow; head and ventrolateral part of body of 101 cm adult male golden brown, with several, irregular, distinct, dusky or black spots scattered over most of the body, tail and dorsal fin; head of 101 cm adult female brown dorsally, paler below; female with a few faint dusky spots on body and tail; both sexes with pores on jaws set in white spots. Teeth small, sharp, caniniform, slightly curved, uniserial on maxillae and dentaries; longest intermaxillary tooth equals 64% eye diameter; vomer with 3 minute teeth. The vertebral counts are higher than in most morays: 4 predorsal, 82 84 preanal and 183 185 total.
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ANKER, ARTHUR. "The eastern Pacific species of Salmoneus Holthuis, 1955, with description of a remarkable new species from Las Perlas Archipelago, Panama (Malacostraca: Decapoda: Alpheidae)." Zootaxa 4651, no. 1 (2019): 125–40. http://dx.doi.org/10.11646/zootaxa.4651.1.8.
Full textAbstract:
The present study deals with five species of the alpheid shrimp genus Salmoneus Holthuis, 1955 from the tropical eastern Pacific. One of them is new to science and is described as Salmoneus tiburon sp. nov. The new species is presently known only from the Las Perlas Archipelago in Panama and can be distinguished from all other congeners by the dentition on the cutting edges of the major chela, with some dactylar teeth reminiscent of shark teeth. It is also one of the largest species of the genus, with the carapace length of both type specimens surpassing 8.0 mm. Salmoneus serratidigitus (Coutière, 1897), a species with an ample distribution across the Indo-Pacific, is recorded for the first time from the Pacific coast of Panama and is confirmed from Colombia. Salmoneus malagensis Anker & Lazarus, 2015, previously known only from Bahía Málaga in Colombia, is recorded from Panama’s Azuero Peninsula. The remaining two species, S. excavatus Anker, 2011 and S. alvarezi Anker & Lazarus, 2015, are recorded regionally from Las Perlas Archipelago in Panama and Playa Tarcoles in Costa Rica, both for the first time since their original descriptions. An identification key to the five currently known eastern Pacific species of Salmoneus is provided. However, several immature and/or incomplete specimens herein preliminarily reported as Salmoneus spp., as well photographic records from southern California, USA, indicate the presence of further undescribed species in the eastern Pacific.
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P. Balabanov, Igor, Vitaliy N. Gilman, Tatyana S. Timofeeva, and Airat I. Faskhutdinov. "Modeling of the Cutting Edge Rounding Influence on the Tool Life in Processing A Gear Wheel by the Power Skiving Method." International Journal of Engineering & Technology 7, no. 4.7 (2018): 71. http://dx.doi.org/10.14419/ijet.v7i4.7.20386.
Full textAbstract:
Modeling of the shaping by a milling cutter is made while forming the internal gear teeth of the driven gear wheel. The estimate of the cutting edge rounding influence on the tool life taking into account the wear-resistant coating. The effects of radii of 10 μm, 15 μm, 20 μm, 25 μm are simulated. At the edge radius of 10 μm, the coating layer is rapidly collapses. At a radius of 15 μm, the highest tool life is obtained. At the more high radii, the tools durability is decreases. A practical experiment was carried out on a cupped skiving cutter with AlTiCN-coating (PVD). Processed steel 41CrAlMo7 with hardness 241-287НВ. The simulation results were confirmed, the highest tools lifetime at a radius of 16.13 microns for 60 parts. As a result, for this type of processing and for this coating type of the cutting tool, the most optimal cutting edge rounding can be considered as the value of 15-18 μm. It can be concluded that, perhaps, a more sharp edge from 10 to 15 μm can be a positive effect on tools lifetime, in the case of uniform rounding over the entire cutter edge of the tools tooth (on the top and side tooth profile).
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Aminova, E. V., O. E. Merezhko, and M. A. Tihonova. "NEW VARIETY OF RASPBERRY ARISHA." Pomiculture and small fruits culture in Russia 66, no. 1 (2021): 7–12. http://dx.doi.org/10.31676/2073-4948-2021-66-7-12.
Full textAbstract:
Raspberries (R. idaeus L.) remain an actual and popular crop. The creation of new varieties with a high level of a complex of economically valuable traits is the most important task in the breeding of raspberries for the conditions of the steppe zone of the Southern Urals. Over the past decade, 22 varieties of red raspberries have been included in the State Register of Breeding Achievements of the Russian Federation. The purpose of this work was to study the red raspberry primocane variety Arisha by a complex of economically valuable characteristics in the conditions of the steppe zone of the Southern Urals. This variety (breeding number 2-20) is one of the results of breeding work of the Orenburg branch of the Federal Horticultural Research Center for Breeding, Agrotechnology and Nursery. The new variety is obtained from free pollination. The research was conducted in 2016-2020 on the basis of the Orenburg branch of the Federal Horticultural Research Center for Breeding, Agrotechnology and Nursery. The variety is of medium maturity, the height of the bush is average, the habit is semi-erect, thorns are greenish-brown concentrated throughout the shoot. The leaves are dark green, wrinkled, and the teeth on the edges of the leaves are medium-sharp. In the irrigated conditions of the steppe zone of the Southern Urals, the average yield of the Arisha variety over the years of research was 3.0 kg per bush, and the average fruit weight was 4.9 g. The berries are large, conical in shape, sweet and sour in taste (4.6 points), with aroma. This promising raspberry variety is characterized by medium drought resistance and heat resistance, and is slightly affected by anthracnose. The potential yield of the variety is realized before freezing by 100 %.
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Depalma, Daniela María, and Myriam Emilia Mermoz. "Ground nesting birds in roadside borders of the Argentine Pampas: habitat use and predation risk of artificial nests." Revista Brasileira de Ornitologia 27, no. 4 (2019): 261–74. http://dx.doi.org/10.1007/bf03546072.
Full textAbstract:
AbstractHabitat loss and fragmentation have led to grassland bird declines, with ground nesters particularly vulnerable. Roadsides could provide habitat, although their suitability depends on several roadside and field characteristics. Vegetation structure determines foraging and nesting site availability. In addition, road delimits sharp edges where the activity of nest predators is usually higher, whereas herbaceous vegetation determines ground nest concealment. Trees could provide lookouts to predators, and modified habitat and woodlands in surrounding fields could offer additional resources to predators. Our objective was to assess habitat suitability for ground nester birds in roadsides belonging to one modified grassland of the Argentine Pampas. We surveyed birds (90 plots) and monitored artificial nests (60 plots) in different road types: unpaved, paved of one-lane per side, and paved of two-lanes per side. Within each road type, we evaluated the relationship that ground nesters abundance had with vegetation structure of roadsides and surrounding fields. In addition, we related predation of artificial nests with the proximity to the road, roadside vegetation, and modified land and woodlands of surrounding fields. We made 2832 records of 84 species using roadsides, including 1083 records of 13 ground nesting species. Abundance of ground nesters increased with tall grass cover of roadsides and decreased with the number of native trees within roadsides. Roughly half (31/60) of the artificial nests were predated and 82.6% of the identified egg-marks were of mammal teeth. Nest predation decreased with nest proximity to the road. Our results emphasize the importance of tall grass cover of roadsides for the conservation of ground nesting species, and the necessity of monitoring natural nests in order to clarify the effect of trees, proximity to the road, and other environmental variables on nest success.