Abstract: Various embodiments of the present technology enable growth of a-axis oriented barium titanate (BTO) films by inserting a relaxed strain control layer having a larger lattice constant than the c-axis of BTO and a similar thermal expansion mismatch. As a result, in-plane tensile stress causes BTO to grow with its ferroelectric polarization in-plane. Some embodiments allow for BTO films to immediately be grown on silicon with a-axis orientation, and without the need to create thick layers for relaxation. Using various embodiments of the present technology, the BTO can be grown in-plane with minimal dislocation density that is confined to the interface region.

Abstract: Various embodiments of the present technology enable growth of a-axis oriented barium titanate (BTO) films by inserting a relaxed strain control layer having a larger lattice constant than the c-axis of BTO and a similar thermal expansion mismatch. As a result, in-plane tensile stress causes BTO to grow with its ferroelectric polarization in-plane. Some embodiments allow for BTO films to immediately be grown on silicon with a-axis orientation, and without the need to create thick layers for relaxation. Using various embodiments of the present technology, the BTO can be grown in-plane with minimal dislocation density that is confined to the interface region.

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.

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.

Abstract: [The invention concerns a] A dental retention pin made of composite material[, comprising] includes a core consisting of [fibers] fibers embedded in a resin matrix. [Said pin is characterized in that t]The [fibers] 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 [(n)] of the [fibers] fibers.

Abstract: A shaped member made of composite material for making a prosthetic element, particularly a tooth post, comprising a core of longitudinal fibers embedded in a resin matrix, and a method for making the member, are disclosed. The member is characterized in that the resin matrix contains at least one metal oxide.

Abstract: Dental post to be fitted, particularly, within a dental cavity (3) comprises axial and longitudinal stiffening elements (7). At least a portion of the stiffening elements which is to be fixed within the cavity (3) comprises, at least at its periphery, a curable product (9) capable of yielding under an applied force so as to conform to the walls of the cavity in which it is located. The product is curable after being introduced into the cavity.

Abstract: A tooth post made of composite material includes a central core (3) made of a resin matrix wherein are embedded fibers (5) which give the post (1) its main mechanical properties. The central core (3) is wrapped in a sheath (6) consisting of at least one layer of fiber (7) made of radio-opaque material.

Abstract: The present invention relates to a tooth prothesis made of composite material and to a process for fabricating said prothesis. The prothesis is characterized in that it is comprised of a central core (3), made of at least one bunch of fibers (5), for example glass fibers, the core being wrapped by a sheath (7) comprised of at least one layer of oriented, isotropic or non isotropic fibers (8a, 8b, 8c) , the fibers (5) of the central core (3) and the fibers of the sheath (7) being embedded in a curable resin, the fibers (8a, 8b, 8c) of the sheath (7) being oriented in a given angle with respect to the longitudinal axis (yy') of the prothesis (1), so as to adjust to desired respective values the longitudinal and transverse traction resistance of the prothesis (1).

Abstract: A crown-root reconstitution system and method of manufacturing a physiological dental securing peg in which a crown reconstituting material (3) is placed between a peg (1) and sound dentine walls (2a). The peg is formed of a composite material and includes high strength fibers (5) embedded parallel to one another, elongated in its axial direction, continuous from one end to the other end thereof. An epoxy resin matrix is formed, and a transverse modulus of elasticity of the order of magnitude of the average of that of the dentine in the amount of 18 GPa and a longitudinal compression-tensile strength and shear strength greater than corresponding average values for the dentine is provided by tensioning all of the fibers equally and pre-stressing all of the fibers in traction.

Abstract: In an assembly constituted by a drill and a tenon for anchoring a dental prosthesis adapted to be fixed in the root of a tooth the drill has a diameter slightly larger than that of the tenon at all points along its length. The tenon and the drill have similar meridian profiles and each is constituted by two coaxial cylindro-conical parts of large and small diameters respectively, the cylindro-conical part of small diameter comprising a cylindrical part connected to the small base of the conical frustum of the cylindro-conical part of large diameter projecting out of the root of the tooth. The tenon and the drill terminate respectively in their truncated end part of small diameter, of which the angle of taper is selected so as to ensure a wedging of the truncated end part of small diameter of the tenon in the corresponding truncated end part of the drilled hole. Futher the truncated end part of the tenon as a length shorter than that of the drill.

Abstract: The present invention relates to an apparatus for transferring a pasty matter for filling a hollow body.This apparatus comprises a cylindrical bowl in which the pasty matter to be transferred is placed and of which the bottom is extended by an axial tube open at its two ends, a push member being engageable in the bowl to push the pasty matter towards and in the axial tube, this push member having an outer diameter substantially equal to the inner diameter of the bowl and having an axial bore passing therethrough and a piston constituted by a rod of diameter equal to the inner diameter of the axial tube extending the bowl, housed and slidable in the axial bore of the push member to be engaged in the axial tube of the bowl and empty this tube of the pasty matter that it contains.