Human teeth - solid education, which are located in the alveoli of the jaws.They are part of the unit, whose functions include chewing, speech.Human teeth have a high capacity to differentiate.They are much smaller compared to the genus of monkeys.
There are four groups of teeth: molars, premolars, incisors, canines.In dentistry, such education is divided by the side and front.The man to seven years functioning primary teeth, which then changed to permanent.These figures are subject to variations, which are caused by the peculiarities of nutrition and the environment.For the last 32 years appear the teeth of this type.Thus, to know how much a person has teeth only in this age.This amount is equal to 32. The last teeth are often reduced, sometimes they do not erupt.To determine the amount of data of bone formation, a special formula.It is called the tooth.In adults, it looks like this: three molars, premolars, two, one canine, two incisors on each half of both jaws.
anatomy of human teeth
There are three parts of this formation: the crown, neck, root.Inside each tooth is a cavity, which is divided into a root canal and the cavity of the crown.After opening the top of the exit of nerves, blood vessels, which ensure the normal functioning of the body.They are found in the pulp, which is represented by loose connective tissue.Wall that directly belongs to the chewing surface of a tooth is called vault.
In dentistry decided to allocate four surface data structures: the vestibular, lingual, chewable (for premolars and molars - plane clamping) contact.The regulations established by direct examination.The crown and root are divided into three parts: okklyuzalnaya average, cervical third.
Human teeth have a complex composition.They are formed dentine, which is represented kostepodobnoy cloth consisting of odontoblasts.The latter composition includes mineral salts (calcium fluoride, magnesium phosphate, calcium phosphate) and organic fibers (collagen).
tooth crown covers very durable material - the enamel, which is built of prisms, which have a thickness of 3-5 microns.It consists of a mineral salt the same as in dentin.
Neck and root covered with cement - a substance that resembles bone.It consists of 30% of organic substances (collagen), occupy the remaining weight mineral salts (calcium carbonate, calcium phosphate).All Education
oral combined under the general term: dentition.It has a complex hierarchy and includes periodontal, muscles, joints, salivary glands, teeth.This system provides the functions of chewing, and participates in the formation of speech.
Teeth-called antagonists in contact education upper mandible.Bone bodies located on the left and right side are designated as antimers.
spatial relationship of jaws and dentition at all movement is called articulation.Particular form of the term is occlusion, which is determined by closing these formations during chewing.It is a determining factor in the formation of an occlusion.
This term refers to the ratio of the upper, lower dentition in the closing jaws.The following types of malocclusion: alveolar arc located on the same level, one of them is located in front of the other.Physiological status is considered, in which the upper row of teeth somewhat shifted forward in relation to the bottom.However, under various pathological conditions in the oral cavity, trauma, occlusion may vary.Human teeth in this case can change their shape and composition.
