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  2. Tooth discoloration - Wikipedia

    en.wikipedia.org/wiki/Tooth_discoloration

    Portrayals of cosmetically enhanced teeth are common in the media. In one report, the most common tooth shade in the general population ranged from A1 to A3 on the VITA classical A1-D4 shade guide. [9] Tooth color varies according to race, gender and geographic region. [4] Females generally have slightly whiter teeth than males, partly because ...

  3. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    The remaining formats fit in between all these formats, such that the sequence of formats A4, E4, C4, G4, B4, F4, D4, *H4, A3 is a geometric progression, in which the dimensions grow by a factor from one size to the next. However, this SIS standard does not define any size between a D format and the next larger A format (called *H in the ...

  4. Universal Numbering System - Wikipedia

    en.wikipedia.org/wiki/Universal_Numbering_System

    Universal numbering system. This is a dental practitioner view, so tooth number 1, the rear upper tooth on the patient's right, appears on the left of the chart. The Universal Numbering System, sometimes called the "American System", is a dental notation system commonly used in the United States. [1] [2]

  5. The best electric toothbrushes of 2025, according to dentists

    www.aol.com/lifestyle/best-electric-toothbrush...

    Dr. Joyce Kahng, owner of O+M Dental Studio in Orange County, California. Dr. Naomi Goldman Levy, a Boston-based cosmetic dentist. Dr. Irina Kessler, a cosmetic dentist with New York Family Dental ...

  6. ISO 216 - Wikipedia

    en.wikipedia.org/wiki/ISO_216

    Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the area of the preceding paper size and rounding down, so that the long side of A(n + 1) is the same length as the short side of An. Hence, each next size is nearly exactly half the area of the prior size. So, an A1 page can fit two A2 pages inside the same area.

  7. Tint, shade and tone - Wikipedia

    en.wikipedia.org/wiki/Tint,_shade_and_tone

    Some tints and shades of blue. In color theory, a tint is a mixture of a color with white, which increases lightness, while a shade is a mixture with black, which increases darkness. Both processes affect the resulting color mixture's relative saturation. A tone is produced either by mixing a color with gray, or by both tinting and shading. [1]

  8. FDI World Dental Federation notation - Wikipedia

    en.wikipedia.org/wiki/FDI_World_Dental...

    FDI World Dental Federation notation (also "FDI notation" or "ISO 3950 notation") is the world's most commonly used dental notation (tooth numbering system). [ 1 ] [ 2 ] It is designated by the International Organization for Standardization as standard ISO 3950 "Dentistry — Designation system for teeth and areas of the oral cavity".

  9. Crown (dental restoration) - Wikipedia

    en.wikipedia.org/wiki/Crown_(dental_restoration)

    To overcome this, the light shade polyvalent colorants take on a distinctly unnatural, bright white appearance. However, research has shown that the shade of the supporting tooth or abutment significantly influences the final appearance of lithium disilicate crowns. Discolored foundations can adversely affect the esthetics of the restoration.