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- Appelgren, Linnea, et al.
(författare)
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Dental plaque pH and ureolytic activity in children and adults of a low caries population
- 2014
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Ingår i: Acta Odontologica Scandinavica. - : Informa UK Limited. - 0001-6357 .- 1502-3850. ; 72:3, s. 194-201
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Tidskriftsartikel (refereegranskat)abstract
- Objectives. The aim of this study was to evaluate the plaque pH level and ureolytic activity among children and adults of Karen Hill tribes. Methods. Thirty-four children aged 6-10 years and 46 adults aged 20-38 years were interviewed regarding oral hygiene practices, sucrose intake and betel chewing. Caries experience (DMFT and DT), calculus, bleeding on probing (BoP) and Plaque index (PlI) were registered. Ureolytic activity in supragingival plaque was tested at two interproximal sites (11/12 and 41/42) with the rapid urease test (RUT). Registration of plaque pH was performed at two interproximal sites (15/ 16 and 31/41) before, during and 30 min after rinsing with an urea solution (0.25%). Four interproximal plaque samples (one from each quadrant) per individual were collected to test the bacterial composition using the checkerboard technique. Results. Children and adults had similarly low DMFT and DT values. Children had a higher baseline pH and a higher ureolytic activity in the maxilla (p < 0.05) compared with adults. A significant correlation (r(2) = 0.63) was found between baseline pH and urease activity in the mandibular anterior teeth. Caries-free individuals had a higher baseline pH compared with caries active individuals in the anterior mandibular region (p < 0.01). The microbiological composition was characterized by an anaerobic low acidiogenic microbiota. Conclusions. Dental plaque pH is related to the ureolytic activity, which explains the low acidogenic plaque microflora and the low caries levels in the Karen population.
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| 2. |
- Arnadottir, Anna, et al.
(författare)
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Solen är en levande stjärna
- 2020
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Konstnärligt arbete (övrigt vetenskapligt/konstnärligt)abstract
- The Sun has shone on our world for four and a half billion years. The light that warms our skin today has been felt by every person who has ever lived.It is our nearest star and our planet’s powerhouse, the source of the energy that drives our winds, our weather and all life.The passage of the Sun’s fiery disc across the sky — day by day, month by month — was the only way to keep track of time for countless past civilisations.Don’t be fooled by the terminology; although it is a typical dwarf star, the Sun consumes 600 million tons of hydrogen each second and is 500 times as massive as all the planets combined.Discover the secrets of our star in this planetarium show and experience never-before-seen images of the Sun’s violent surface in immersive fulldome format.Our team has worked with some of the most talented planetarium producers to bring you this visually striking planetarium show about the most important star in our lives.
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