What's the difference between molar and premolar?

Molar


Definition:

  • (a.) Of or pertaining to a mass of matter; -- said of the properties or motions of masses, as distinguished from those of molecules or atoms.
  • (a.) Having power to grind; grinding; as, the molar teeth; also, of or pertaining to the molar teeth.
  • (n.) Any one of the teeth back of the incisors and canines. The molar which replace the deciduous or milk teeth are designated as premolars, and those which are not preceded by deciduous teeth are sometimes called true molars. See Tooth.

Example Sentences:

  • (1) The effect of S-adenosylhomocysteine on DNA methylation was examined, and it was found at equal molar concentrations of S-adenosylhomocysteine to to S-adenosylmethionine that DNA methylation was competitively inhibited 50%.
  • (2) This suggests that molars do not maintain a fixed relationship to incisors over time, and extreme care must be taken to standardize an experiment to a specific body weight when using this method.
  • (3) Of the sampled population, 6.3 per cent exhibited some degree of hypodontia (third molar agenesis excluded).
  • (4) To understand the reason for the opposite effect of the molar ratio observed at the middle of and at four residues away from the lysine-rich sequence, actual cross-linked residue(s) was (were) determined by subjecting cross-linked product to a protein sequencer.
  • (5) This article presents the case of bilateral absent maxillary permanent molars with severe oligodontia and no other abnormalities.
  • (6) The molar refractivity has been shown to be a superior parameter for the description of the activity of sulphonamides than the sum of electronegativities of atoms making up a heterocyclic substituent in the sulphonamide molecule and molecular weight of the substituent.
  • (7) In terms of segmental motion and anisotropy of packing the lipoprotein-X bilayer closely resembles a model bilayer system consisting of phosphatidylcholine, lysophosphatidylcholine, sphingomyelin and cholesterol mixed in the same molar ratio as in lipoprotein-X.
  • (8) The effect develops within approximately 2 hours and does not depend on EDTA concentration provided the complexon is in a molar excess over the enzyme.
  • (9) This differential absorbance is linear with increasing concentrations of Na2MoO4 and was used to calculate the molar extinction coefficient of molybdochelin at 425 nm (epsilon similar to 6,200).
  • (10) Following a baseline examination, the furcation-involved molars were randomly assigned in each patient to either a test or a control treatment procedure.
  • (11) Three brands of glass ionomer were applied to prepared dentin surfaces of extracted human molars, after one of four treatments with polyacrylic acid.
  • (12) The oxygen-free radical scavengers thiourea, mannitol and catalase prevented toxicity mediated by ferrous ammoniumsulphate but not by ferrous ascorbate (molar ratio of 1:20).
  • (13) Both agents produced similar significant increases in the cholesterol ester content and cholesterol-to-phospholipid molar ratio of the membranes.
  • (14) Changes in third molar angulation from pretreatment to posttreatment for the two groups were compared for statistical differences using a Student's t-test.
  • (15) The Authors analyze the force system delivered on the molar and on the anchorage unit.
  • (16) Eight macerated human child skulls with a dental age of approximately 9.5 years (mixed dentition) were consecutively subjected to an experimental standardized high-pull headgear traction system attached to the maxilla at the first permanent molar area via an immovable acrylic resin splint covering all teeth.
  • (17) Both types of cells took up linoleic (18:2(n-6)) and linolenic (18:3(n-3)) fatty acids at the same rate when they were added complexed either to albumin or AFP at a 1:1 molar ratio.
  • (18) Owing to its broad spectrum of action (covering both gram-positive and gram-negative microorganisms and anaerobes) and its consistently strong molar action, mezlocillin is well suited as a beta-lactam combination component for intensive care patients.
  • (19) These findings indicate that rGRF-LI is localized in the median eminence and arcuate nucleus in the rat and that rGRF-, SRIF-(1-28)-, and SRIF-(1-14)-LI are present in a 1:2.10:6.29 ratio on a molar basis.
  • (20) The development of the first molar was examined from the dental lamina stage through apposition.

Premolar


Definition:

  • (a.) Situated in front of the molar teeth.
  • (n.) An anterior molar tooth which has replaced a deciduous molar. See Tooth.

Example Sentences:

  • (1) Maxillary and mandibular incisors and premolars of three rhesus monkeys were used.
  • (2) Erosion was observed on all teeth, but was commonest on the upper incisors, canines and premolars, and severest on palatal surfaces.
  • (3) Sound (n = 28) and carious (n = 123) approximal surfaces of extracted premolars and molars were radiographed.
  • (4) Four weeks after replantation, a more than threefold increase in PBF was measured in premolars with two roots, while PBF in premolars with one root and incisors was consistently reduced to an average of 40% of the controls.
  • (5) Molarization and premolarization of anterior teeth have never been reported before.
  • (6) The mandible does tend to rotate in a counterclockwise manner following enucleation of four first premolars without appliance therapy.
  • (7) Eight cases were studied separately, since three showed bilateral congenital absence of the second premolar, three showed unilateral congenital absence of the second premolar on the affected side, and two had the first permanent molar extracted.
  • (8) A "sweep" bend was incorporated to avoid unwanted side effects at the second premolar.
  • (9) Furthermore, agenesis of incisors, canines and premolars ranges from 0.4% in controls to 1.3% in propositi having reduced ULI and 5.0% in propositi with two missing ULI.
  • (10) The aberrant gland appeared on a panoramic radiograph as a radiolucency judged to be a periapical lesion on the right mandibular second premolar.
  • (11) All premolars were extracted after 1 calendar month.
  • (12) The purpose of the present radiologic study was to establish prevalence and distribution of pulp stones in mandibular premolars and molars in skulls of Norwegian Samis.
  • (13) One hundred and eighty seven mandibular premolars taken from a Turkish population were examined in this study.
  • (14) Forty molar and premolar teeth had non-retentive cavities prepared and restored with amalgam using (1) copal varnish (control), (2) a pin, (3) Amalgambond or (4) Panavia-Ex.
  • (15) Bone biopsies should be taken in either the premolar or the molar region of mandibular bodies.
  • (16) An unusual case of Stafne's bone cavity which presented in the canine-premolar region of the mandible is presented.
  • (17) Spaces needing prosthetic closure are transferred to more posterior regions of the dental arch, usually in the premolar region.
  • (18) In a second series of analyses, the mean lead concentrations of both dental hard tissues of premolars and permanent molars of young individuals from Strasbourg, rural Alsace, and Mexico City were compared.
  • (19) Autotransplantation of mandibular first premolars to the incisor region is suggested as an approach in selected cases.
  • (20) The samples were collected from both an intact fissure and a fissure with brown-stained defective enamel surface of the premolars of the lower jaw.