Injuries to teeth can be very distressing for patients. Prompt treatment is essential. Injuries of the tooth bearing portion of the mandible are common and can even result after a relatively low impact trauma. The alveolus (tooth bearing portion of bone) and/or the tooth may be damaged. Segmental fractures involve multiple teeth and the supporting alveolar bone.
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http://dx.doi.org/10.1136/emj.2006.035949 | DOI Listing |
J Orofac Orthop
December 2024
Department of Orthodontics, Saarland University, 66424, Homburg/Saar, Germany.
Background And Aim: Treatment effects of a combined rapid maxillary expansion (RME) and Delaire facemask (DFM) therapy have so far only been scientifically investigated through cephalometric analyses. The combination of cephalometric, dental cast and cone-beam computed tomography (CBCT) scan analysis was not yet used for investigating morphologic changes of the tooth-bearing palate. The aim of the present study was to determine whether patient age at treatment begin has an influence upon palatal length changes after RME/DFM therapy, and to what extent transverse palatal sutures contribute to these.
View Article and Find Full Text PDFAm J Primatol
January 2025
Shaanxi Key Laboratory for Animal Conservation, College of Life Sciences, Northwest University, Xi'an, Shaanxi, China.
A tooth-bearing mandible fossil of a colobine monkey discovered at Shuitangba, Zhaotong, Yunnan, China, was morphometrically analyzed and compared with extant Asian colobines. Our previous qualitative and quantitative descriptions indicate that it can be safely attributed to Mesopithecus pentelicus, a Miocene fossil colobine widely found in Europe and South Asia. The present research aims to explore fossil association with extant colobines and functionally propose its dietary preferences based on multivariate morphometric analyses of mandibular morphology.
View Article and Find Full Text PDFHeliyon
January 2024
The Department of Mechanical Engineering, The University of Sheffield, Sheffield S1 3JD, UK.
In order to ensure the normal transmission of incomplete gears without interference during the process of gear meshing. This research first establishes the theoretical model to explore the influence of the reference circle pressure angle ( ), the addendum modification coefficient, and the number of teeth on the addendum-shortened-coefficient ( ) of the incomplete driving gear's first-last teeth, and then systematically explores the influence between the key factors and the decrease of . The results show that: (1) When the pressure angle of the driven gear addendum circle ( ) and the maximum critical value of the addendum radius of the driving gear to avoid interference ( ) increases with the increase of , decreases with the increase of ; (2) In the cases of high-modification gear transmission and angular-modification gear transmission, there are five conditions in which decreases due to the addendum modification coefficient of driving gear ( ) and the addendum modification coefficient of driven gear ( ): 1) High-modification gear transmission with one case:① , with the increase of , that is: and are opposite number; 2) Angular-modification gear transmission with other four cases: ② , with , that is: The driving and driven gears are negative-modified and standard gears, respectively; ③ , with , that is: The driving and driven gears are standard and positive-modified gears, respectively; ④ , , with the increase of , that is: The sum of and are negative and neither of them is zero, there exist three kinds of addendum modification gears for the driving and driven gear, which are positive-negative, negative-positive and negative-negative.
View Article and Find Full Text PDFZootaxa
April 2024
Instituto Nacional de Pesquisas da Amazônia; Coordenação de Biodiversidade; Av. André Araújo; 2.936; 69067-375 Manaus; Amazonas; Brazil.
The F-0 exuvia of Protoneura paucinervis Selys, 1886 is described, illustrated, and diagnosed by comparison with the hitherto known Protoneura Selys in Sagra, 1857 larvae. The larvae of P. paucinervis can be distinguished from its congeners by the following combination of characters: palpal lobe squared bearing three strong teeth, 5 palpal setae, and nodus of lateral gills at 0.
View Article and Find Full Text PDFA new dromiid crab, Epigodromia mclayi sp. nov., is described from the southeastern Arabian Sea and southwestern Bay of Bengal, India, based on 2 males collected onboard FORV Sagar Sampada cruises 392 and 236, respectively at depths of 107-113 m.
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