Terms of occurrence of non-permanent teeth
lower jaw: central incisors - early in the second half of the year, side - 7 months, the fourth in a year or a year and four months, canines to about 20 months, the teeth in the fifth year and eight monthsand up to two and a half years.Upper jaw: central incisors of 7.5 months, the side in 8 months, the teeth in the fourth year and up to 16 months, with fangs and four years to one year and eight months, the fifth to 30 months.
reason for non-permanent loss of milk teeth
loss of deciduous teeth begins with the beginning of growth of permanent teeth.The process of loss of primary teeth root resorption caused by the dairy, t. E. The root gradually resorbed.
Upon germination permanent tooth that extends through the jawbone directly to the soft tissues of the jaw, the root of the primary tooth is good less and less.And as a result of milk tooth root no longer able to hold it in the cavity and the tooth freely separated from its seat.
Effect of premature
One of the significant features of primary teeth are pointers room for the second shift, t. E. Permanent teeth.In that case, if the child as it develops premature baby tooth falls out and his place is not maintained, then later to replace the permanent teeth can be curved or may be hindered their growth.
premature loss of primary teeth can cause the permanent teeth to grow uneven.Consider the example of a premature loss of second molar child.
Under normal growth of teeth, t. E. The normal change of non-permanent teeth to permanent teeth should occur resorbitsiya primary roots of the teeth.Resorbitsiya root frees up space for the next permanent tooth and shows him the right place for its location in the dentition.In addition, if the primary root of the second tooth was available before the end of the eruption of permanent, its presence on the spot helps ensure consistent and proper space for the permanent teeth.
But if the second indigenous milk tooth fell prematurely in the early stages of tooth replacement, its function is to specify the place of permanent location is not shown.Because of this first permanent molar will undertake the search for a suitable new place and begins to move toward the center of the free space.As a result, bicuspid can generally be left without proper place or have difficulties eruption bicuspid, t. To. He can not easily pass through the gum tissue.
To replace the specified place, dropped out prematurely tooth, using a special device.
If you can not avoid removing milk tooth at an early stage of development and the need to maintain a permanent place for the next permanent teeth, dentists use the tool - holder places the extracted tooth.This device is mounted on one of the teeth on the side where the tooth was removed, and the second end of the device holds the wire on the tooth from the opposite side of the empty seats.With this method (hold space wells premature tooth extraction), there is room for further growth of permanent tooth and the neighboring teeth will shift, taking someone else's place.This helps correct the appearance of permanent teeth and activities designed for them places.This arrangement will help prevent further intervention for correction of teeth, such as braces.This holder is removed as soon as it becomes noticeable permanent tooth penetration through the gums.