matrix band


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band

 [band]
1. a part, structure, or appliance that binds; for anatomical structures, see frenulum, tenia, trabecula, and vinculum.
2. in dentistry, a thin metal strip fitted around a tooth or its roots.
3. in histology, a zone of a myofibril of striated muscle.
4. in cytogenetics, a segment of a chromosome stained brighter or darker than the adjacent bands; used in identifying the chromosomes and in determining the exact extent of chromosomal abnormalities. Called Q-bands, G-bands, C-bands, T-bands, etc., according to the staining method used. See also layer, stria, and stripe.
A band the dark-staining zone of a sarcomere, whose center is traversed by the H band.
H band a pale zone sometimes seen traversing the center of the A band of a striated myofibril.
I band the band within a striated myofibril, seen as a light region under the light microscope and as a dark region under polarized light.
M band the narrow dark band in the center of the H band.
matrix band a cylindrical metal band with a special clamp or holder (the matrix retainer); it is filled with softened impression compound and seated over a tooth so that the compound flows into the prepared cavity and an impression of the tooth can be obtained. It is also used for placement and contouring of certain restorative materials.
orthodontic band a band fitted over a tooth to anchor an orthodontic fixed appliance.
Z band a thin membrane in a myofibril, seen on longitudinal section as a dark line in the center of the I band; the distance between Z bands delimits the sarcomeres of striated muscle.

ma·trix band

a metal or plastic band secured around the crown of a tooth to confine restorative material to be adapted into a prepared cavity.

matrix band

a cylindrical copper or stainless steel band or short tube that is seated over a tooth. The band may be filled with impression compound, which flows into a prepared cavity in order to obtain an impression, or it may be used to aid in the placement and contouring of restorative materials. See also matrix retainer.

ma·trix band

(mā'triks band)
A metal or plastic band secured around the crown of a tooth to confine restorative material to be adapted into a prepared cavity.

ma·trix band

(mā'triks band)
Metal or plastic band secured around tooth crown to confine restorative material to be adapted into a prepared cavity.