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  2. Nail (fastener) - Wikipedia

    en.wikipedia.org/wiki/Nail_(fastener)

    Double-ended nail – a rare type of nail with points on both ends and the "head" in the middle for joining boards together. See this patent. Similar to a dowel nail but with a head on the shank. Double-headed (duplex, formwork, shutter, scaffold) nail – used for temporary nailing; nails can easily pulled for later disassembly

  3. 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]

  4. Human tooth - Wikipedia

    en.wikipedia.org/wiki/Human_tooth

    Primary teeth start to form in the development of the embryo between the sixth and eighth weeks, and permanent teeth begin to form in the twentieth week. [25] If teeth do not start to develop at or near these times, they will not develop at all. A significant amount of research has focused on determining the processes that initiate tooth ...

  5. Dental anatomy - Wikipedia

    en.wikipedia.org/wiki/Dental_anatomy

    The universal numbering system uses a unique letter or number for each tooth. The uppercase letters A through T are used for primary teeth and the numbers 1 - 32 are used for permanent teeth. The tooth designated "1" is the right maxillary third molar and the count continues along the upper teeth to the left side.

  6. Tooth fusion - Wikipedia

    en.wikipedia.org/wiki/Tooth_fusion

    Double teeth can cause other dental problems such as crowding, ectopic eruption of adjacent teeth, gum issues, cavities, malocclusion, poor esthetics, and more. [1] Treatment depends on whether the tooth is a primary or permanent tooth, the degree of fusion, and its functional & esthetic impact.

  7. Dental notation - Wikipedia

    en.wikipedia.org/wiki/Dental_notation

    The upper teeth are denoted I 1, I 2, C −, Pm 3, Pm 4, M 1, M 2, and M 3. Left or right has to be specified. The lower teeth are I 1, I 2, C −, Pm 3, Pm 4, M 1, M 2, and M 3. The reason the premolars are labeled 3 and 4 is that in earlier primates there were two other premolars between them and the canines. [5]

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  9. Butt joint - Wikipedia

    en.wikipedia.org/wiki/Butt_joint

    Members are brought together and a number of nails are driven in to hold them in place. The technique of skew-nailing is applied so that nails are not parallel to each other and so resist the pulling apart of the joint. [2] This form of butt joint is rarely used in furniture making. Used for: framing in building construction, such as platform ...