(n.) A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a fibrous structure. It is supposed to be produced by the disengagement of watery vapor without liquid or plastic lava. It is much used, esp. in the form of powder, for smoothing and polishing. Called also pumice stone.
Example Sentences:
(1) A new method, not previously recommended, involving the use of a green rubber wheel followed by pumice or composite finishing paste was similarly examined and found to come closest to restoring the original, natural enamel surface.
(2) Radiograms of the cranium show a "pumice-stone" appearance of the dome and deformation of the sella turcica.
(3) This layer can be removed by thorough pumicing or by grinding.
(4) Also, fewer bacteria were recovered from vigorously-pumiced, molar-tooth surfaces 24 h after application of albumin compared to buffer-treated controls.
(5) Ragwheels and pumice samples were collected and cultured, the results of which mandate the need for infection control guidelines for the dental laboratory.
(6) Scanning electron micrographs, surface profile tracings, surface roughness recordings, and statistical analysis of data support the finding that the best surface finish is obtained when sandblasting, hard stone, medium abrasive disk, second sandblasting, electropolishing, hard rubber point, hard felt disk with pumice slurry, and felt disk and soft brush with polishing paste are used progressively.
(7) Finishing was done with wet pumice and cup, wet pumice and a brush, a grit rubber polishing point, and an aluminum oxide- coated disc.
(8) Method I consisted of green stone, followed in sequence by finishing bur and pastes of pumice, powdered chalk, and SnO2.
(9) Various abrasive materials, such as pumice, polyethylene, and aluminum oxide are widely used as adjuncts in the therapy of acne.
(10) Pumice and air-powder polishing gave a similar reduction of the sonic scaling roughness.
(11) The occlusal surface was (1) air polished for 20 seconds, (2) cleaned with pumice for 20 seconds, or (3) not cleaned.
(12) All patients received a subgingival scaling and pumice by a hygienist every 6 months.
(13) Test teeth were cleaned with pumice and 10% alcohol, air-dried, and insulated at the approximal surfaces with strips of rubber dam.
(14) Thus, pumicing is a necessary final step with all removal procedures studied.
(15) The mean CO2 output during anaesthesia in paralyzed patients can be monitored by continuous capnographic analysis of the total exhaled gases, the latter being mechanically integrated by pumice canisters.
(16) Food particles (wheat flour, fishmeal or yeast) were ingested approximately 3 times faster than inert particles (kaolin, pumice or synthetic cellulose).
(17) However, when the surface of the etched enamel was pumiced, the enamel reacquired both the shine and appearance of non-etched enamel.
(18) Samples of used dental laboratory pumice from the two dental laboratories were cultured for the isolation of fungi.
(19) A flat enamel surface was obtained with 600-grit silicon carbide paper and cleaned with a rubber cup and a water slurry of fine flour of pumice.
(20) The rubbing application of a hydrochloric acid-pumice mixture has been advocated for the removal of fluorotic-like areas of permanent teeth.
Volcanic
Definition:
(a.) Of or pertaining to a volcano or volcanoes; as, volcanic heat.
(a.) Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.
(a.) Changed or affected by the heat of a volcano.
Example Sentences:
(1) But volcanic liberation has never really been his bag.
(2) Future ice loss and bending of the crust due to rising sea levels have the potential ultimately to raise levels of both earthquake and volcanic activity.
(3) He was a prowling, volcanic presence on the touchline.
(4) The Texas senator Ted Cruz says the rise of Donald Trump makes him “very optimistic” the next occupant of the White House will be a conservative – perhaps himself – propelled there by the “volcanic rage” of voters.
(5) In summary, volcanic ash alone or in combination with SO2 had only minimal effects on certain host defense mechanisms.
(6) Facebook Twitter Pinterest The landscape near San José I had started with a night in Rodalquilar, a white-washed village inside a large volcanic crater.
(7) If you only have an 20cm tin you can use that instead, but don't use all the batter – about 80% will suffice – otherwise you'll end up with a volcanic overspill, cake soldered to the floor of the oven and a frayed temper.
(8) Even by Congolese standards, Goma has endured much in its history , from mass looting by the army to the arrival of a million Rwandan Hutu refugees, years of cross-border wars and, in 2002, a volcanic eruption that poured a tide of lava through its heart.
(9) She writes about the nightmarish scenarios surrounding geoengineering, or hacking the planet, by spraying seawater into the sky to create cloud cover, or simulating a volcanic eruption to fill the lower atmosphere with ash.
(10) The telescope, which is perched on the summit of Mauna Kea, a volcanic island in Hawaii, picked up signs of methane in the planet's atmosphere that could not be seen by either Hubble or Spitzer .
(11) A thermoacidophilic micro-organism, isolated from volcanic hot springs near Naples, was cultivated in vitro, and examined by electron microscopy in sections and after negative staining.
(12) Festivalgoers in Edinburgh will witness the city’s birth from volcanic eruptions and the crushing force ice in a late-night spectacular that will open this year’s events.
(13) Triassic-Jurassic, c 200 million years ago Three-quarters of species were lost, again most likely due to another huge outburst of volcanism.
(14) But to do Hakone justice, find a reasonably priced ryokan and take a couple of days to explore the volcanic geysers of Owakudani, the botanical gardens, the cherry blossom in spring and Hakone shrine on the shore of the lake.
(15) Following the 1980 Mount St. Helens volcanic eruption, psychiatric reactions were studied in the disaster area and in a control community.
(16) A thousand years ago, it was responsible for one of the largest volcanic eruptions in human history.
(17) Edinburgh’s skyline is dominated by Castle Rock, Calton Hill nearby, the dramatic volcanic remnants of Arthur’s Seat and the cliffs of Salisbury Crags , but festival events rarely focus on the city’s geological history.
(18) Lake Nyos sits in a crater on the edge of an inactive volcano in the Oku volcanic field.
(19) Costs of the disruption to the global airline industry caused by the volcanic ash cloud have spiralled to $1.7bn (£1.1bn), according to new estimates today from the International Air Transport Association (Iata).
(20) On her newest album Haze recalls discovering rap as an outlet: " I was nothing Then all of a sudden I'm a volcanic eruption. "