Objective: The aim of this study was to clarify an influence of the fine structure of human tooth enamel to the yellowing teeth. Materials and methods: Sound maxillary first premolars of 15–50-year-old females that were extracted for the orthodontic treatment were used as the test samples. ...
Abstract. Enamel, which covers the anatomical crown of the tooth, is the hardest tissue in human body. Supported by a soft but tough dentin structure, the
a.The upper bony ridge of the human nose. b.The part of a pair of eyeglasses that rests against this ridge. 2.A fixed or removable replacement for one or several but not all of the natural teeth, usually anchored at each end to a natural tooth. ...
The human tooth is a functionally-gradient structural composite material composed of collagen and hydroxyapatite (HAP). The outer most region is a hard enamel layer consisting primarily of HAP. Underneath is dentin region, which is composed of HAP with a significant fraction of collagen fibers. It...
(1. 9) . (b)studied (c)some studies (d)studying (a)a study Vocabulary 9 Most cats are suspicious of human beings their lives. (1. 5) (c)through (d)while (a)during (b)throughout 南及 10 there is a good deal of truth in this idea. (1. 7) (d)Surprisingly enough (a)As ...
tooth- toothlike structure in invertebrates found in the mouth or alimentary canal or on a shell pad- the fleshy cushion-like underside of an animal's foot or of a human's finger branchial cleft,gill cleft,gill slit- one of a series of slit openings in the pharynxes of fishes and aquat...
Enamel is the hardest and most resilient tissue in the human body. Enamel includes morphologically aligned, parallel, ∼50 nm wide, microns-long nanocrystals, bundled either into 5-μm-wide rods or their space-filling interrod. The orientation of en
Much of the theory of population genetics is based on the assumption that populations are panmictic. While this may be nearly true in some instances, most populations of interest (particularly in man) exhibit some form of subdivision. Most often, spatial
tooth- toothlike structure in invertebrates found in the mouth or alimentary canal or on a shell pad- the fleshy cushion-like underside of an animal's foot or of a human's finger branchial cleft,gill cleft,gill slit- one of a series of slit openings in the pharynxes of fishes and aquat...
Studies of the human microbiome have revealed that even healthy individuals differ remarkably in the microbes that occupy habitats such as the gut, skin and vagina. Much of this diversity remains unexplained, although diet, environment, host genetics and