|Title||Влияние ориентации призм края кариозной полости на распределение напряжений в эмали|
Smiianov, Yurii Vladyslavovych
stress in enamel
finite element method
|Date of Issue||2016|
|Publisher||Харк. нац. мед. ун-т|
|Citation||Смеянов, Ю.В. Влияние ориентации призм края кариозной полости на распределение напряжений в эмали [Текст] / Ю.В. Смеянов // Питання експериментальної та клінічної стоматології: Зб. наук. праць. - Вип. 12. / Редкол.: Є.М. Рябоконь (вiдп. ред.) та iн.; МОЗ України, Харк. нац. мед. ун-т. - Xapкiв: ХНМУ, 2016. - С. 218-222.|
Under the functional load on teeth the surface enamel is exposed to internal
stresses and deformations. Further, the load is transmitted to the prisms, and then is
redistributed to the morphological structure of the tooth. In carious enamel on the
edge of defect with filling material the orientation of prisms change, which leads to
disruption of the internal stress distribution.
The aim of the research was to study the stresses in enamel in the formation
of the edge of carious cavity with a different course of prisms.
Methods. The finite element models were built with computer simulation. In
the center of the test tooth it was simulated the vertical unidirectional load of 100
MPa. It was calculated the tension in the enamel of intact tooth when the edge of
the enamel was formed in the form of direct and inverse cone. The characteristic of
the stress state was expressed by the von Mises equivalent stress in MPa.
Results. In intact teeth in the place of vertical load the maximum stress of
enamel (74.2 MPa) occurs. In the contact zone of the restorative material with the
edge of the enamel in teeth where the enamel edge of I class carious cavity are
formed vertically without skew, the maximum stress from 220.0 to 241.5 MPa occurs.
When the edge of the enamel is formed in the form of an inverted cone the
beams of enamel prisms are cut at their course so the restorative material contacts
with the side surface of prisms, the maximum stress in the surface enamel occurs in
the contact zone (246.1-290.9 MPa). The most favourable state of stress in the
enamel occurs in the formation of the edges in the form of direct cone, when prisms
intersect transversely -121.6-162.1 MPa.
Conclusions. The lowest stress, in the tooth enamel in the formation of I
class Black cavities, occurs under the load on the physiologically oriented course of
enamel prisms, transversely to their axis. This is achieved by the formation of a direct
cone in the enamel edge of carious cavity.
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|Smeyanov_enamelsprizm.pdf||4,26 MB||Adobe PDF||579|
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