Transparent and radio-opaque retention pin
AssigneeSociete De Recherches Techniques Dentaires—Rtd
InventorsManh-Quynh CHU, Pierre-Luc REYNAUD, Marc REYNAUD
Life of this patent
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Abstract
A dental retention pin made of composite material includes a core consisting of fibers embedded in a resin matrix. The fibers, which have a refractive index (n), are radio-opaque, and the refractive index (n′) of the resin forming the matrix has a value close to that of the fibers.
Claims11
A dental retention pin made of composite material comprising:
- a core of fibers embedded in a resin matrix, the resin matrix comprising at least one resin and a solvent, wherein,
- the pin has two opposing ends along a longitudinal axis,
- the fibers are oriented in the core in a manner that is parallel to the longitudinal axis and continuously from one end of the pin to the other,
- the pin is able to transmit light from the one end to the other end,
- the fibers, which have a refractive index (n), are radio-opaque,
- a refractive index (n′) of the resin matrix has a value within 0.15 of that of the fibers, and
- the fibers are alkali resistant (AR) fibers.
A process for making a dental retention pin having a core of radio-opaque fibers extending from one end of the retention pin to the other and which are embedded in a resin matrix, the process comprising the steps of:
- making the resin matrix from at least one resin and a solvent, so that the resin matrix has a refractive index within 0.15 of that of the fibers;
- and
- embedding in the resin matrix a minimum quantity of the fibers for giving the retention pin mechanical characteristics and a degree of radio-opacity desired;
- wherein
- the pin has a length and a longitudinal axis,
- the fibers are oriented parallel to the longitudinal axis and continuously from one end of the retention pin to the other,
- the fibers are AR fibers,
- the pin is able to transmit light from the one end to the other end.
A composite rod comprises
- a core of fibers embedded in a resin matrix, the resin matrix comprising at least one resin and a solvent,
- the fibers are oriented in longitudinal direction and continuously over the whole length of the rod,
- the fibers, which have a refractive index (n), are radio-opaque;
- a refractive index (n′) of the resin matrix has a value within 0.15 of that of the fibers.
Dependencies are inferred from the claim text.