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DenTek Oral Care, Inc. is an American private company that develops, manufactures and markets oral care products. DenTek was founded in 1985 by John Jansheski. His father, John Jansheski, invented an at-home tartar removal device. [1] Their products are available in the United States, Canada, Germany, and the United Kingdom.
Dental floss (waxed) Levi Spear Parmly (1790-1859), a dentist from New Orleans, is credited with inventing the first form of dental floss. [4] In 1819, he recommended running a waxen silk thread "through the interstices of the teeth, between their necks and the arches of the gum, to dislodge that irritating matter which no brush can remove and which is the real source of disease."
where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.
In 2006, Crest Glide was the second-ranked brand of dental floss in the United States, with sales (in supermarkets and drug stores) of $22 million and a market share of 18.8%, just behind Johnson & Johnson Reach. [4]
Needle threader and usage with a needle. Typical needle threader. A needle threader is a device for helping to put thread through the eye of a needle.Many kinds exist, though a common type combines a short length of fine wire bent into a diamond shape, with one corner held by a piece of tinplate or plastic.
For example, “.750-10 UNC-2A” is male (A) with a nominal major diameter of 0.750 inches, 10 threads per inch, and a class-2 fit; “.500-20 UNF-1B” would be female (B) with a 0.500-inch nominal major diameter, 20 threads per inch, and a class-1 fit. An arrow points from this designation to the surface in question. [19]