perikymata

perikymata

 [per″ĭ-ki´mah-tah]
the numerous small transverse ridges on the surface of the enamel of permanent teeth, representing overlapping prism groups; continued abrasion erodes the enamel surface and obliterates them.

per·i·ky·ma·ta

, sing.

per·i·ky·ma

(per'i-kī'mă-tă, -kī'mă),
Transverse ridges and grooves on the surface of tooth enamel.
[peri- + G. kyma, wave]

per·i·ky·ma·ta

(per'i-kī'mă-tă)
Shallow, horizontal furrows on the enamel of a tooth where the striae of Retzius meet the surface.
[peri- + G. kyma, wave]

per·i·ky·ma·ta

(per'i-kī'mă-tă)
Transverse ridges and grooves on tooth enamel surface.
[peri- + G. kyma, wave]

perikymata (per″'ĭki´mətə),

n the wavy ridges on the surface of a permanent tooth, which signify overlaps in the enamel structure and that may disappear as the enamel wears over time.
References in periodicals archive ?
from the Kayenta Formation (Early Jurassic: Pliensbachian) of Arizona (Sues 1985) in the presence of a distinct cingular cusp at the anterior (mesial) end of each row of cusps and pronounced perikymata on the enamel.
They estimated age at the time of death by counting a series of ridges on the surface of the enamel, called perikymata.
Greater numbers of perikymata indicate faster, ape-like enamel growth; fewer numbers point to slower, human-like growth.
Not all paleoanthropologists are sure that perikymata form on a weekly basis, but the British researchers have gained a number of supporters.
Their results are exciting,' says Tobias, "but more work needs to be done on the perikymata evidence.
Conroy says that studies suggesting a weekly cycle of enamel formation are "60 to 70 percent convincing at this point,' although it is unclear why the periodicity occurs or what function perikymata serve.
Grine of the State University of New York at Stony Brooks, regards the perikymata data as dubious and based on inadequate studies of enamel formation in modern populations.