[an error occurred while processing this directive]The Effect of Magnetic Attachment to the Human Periodontal Epithelial Cells
The denture magnetic attachment is supposed to approach
nearest the periodontal epithelial layer. The purpose of the present
study was to investigate the effects of magnetic field on fixation
and proliferation of human periodontal epithelial cells, periodontal
constitutive cells, and on the induction of production of
interleukin-8 (IL-8), an inflammatory cytokine secreted by
periodontal epithelial cells.
We are developing a new removable crown and bridge system used
in dental casting. In this system, the retentive force is given by
the magnetic force. In previous studies, We suggested that a Fe-Pt
magnetic alloy can be used for the outer cap of this system. For
inner cap material, magnetic stainless steel (SUS447J1) was
considered and the properties of this alloy were investigated. Using
commercially available investments, We examined castability and
surface roughness of the casting. The casting with
TitavestCB®‚ showed the possibility of dental casting.
This time, We investigated the magnetic behavior of SUS447J1 which
was cast according to the optimum condition of the previous studies.
Since SUS447Jl is a Fe-Cr alloy, it is generally considered that the
sigma-phase precipitate in the alloy during the cast procedure.
Therefore certain heat treatment conditions may be required to
prevent the precipitation of the sigma-Phase. We applied various
conditions of heat treatment to the casting and the effects of these
conditions on magnetic properties and attractive force were examined.
The SUS447Jl casting which was heated the optimum condition. showed
good magnetic properties. Attractive force exceeding 7N was obtained
under this condition. No sigma-phase was observed in X-ray analysis.
Generally, the clasp denture has been tended to affect the
abutment tooth an injurious lateral force, when setting the denture
in the mouth and removing the denture from the mouth. This case
report describes the rationality design for removable partial denture
without the lateral force at setting and removing the denture. The
patient was 59 years woman and missed tooth 76| into mandible. For
the patient, the denture was structurally designed to be used for
long term period. Sectional denture was connected upper and lower
segments with hinge on the distal end and magnetic attachment to
decrease the lateral forces. The patient has satisfaction without any
problems for five years.