The invention discloses porous, bioactive glass and glass ceramic morsels or pellets to be used as tissue graft substitute materials and processes for obtaining the same wherein the bioactive glass and glass ceramic morsels or pellets are made up of natural agents like phosphate, calcium, sodium and other elements which are not alien to the human or animal body. The said preparation process encompasses various steps like quenching sintering, foaming, and sol-gel casting which render the glass morsels or pellets unique bioactivity and enhanced porosity which may facilitate tissue repair and augmentation during tissue graft replacement.

A glass composition includes, as main content components, by mass %, a TeO.sub.2 content percentage of 50% to 80%, a Bi.sub.2O.sub.3 content percentage of 0% to 30%, a WO.sub.3 content percentage of 0% to 30%, a ZnO content percentage of 0% to 30%, a BaO content percentage of 0% to 30%, a GeO.sub.2 content percentage of 0% to 30%, and a Ga.sub.2O.sub.3 content percentage of 0% to 30%, wherein at least any one of additive target elements is introduced, the additive target elements including, Si.sup.4+ of 1 mg/kg to 1,500 mg/kg, B.sup.3+ of 1 mg/kg to 1,500 mg/kg, P.sup.5+ of 1 mg/kg to 1,500 mg/kg, Li.sup.+ of 1 mg/kg to 1,500 mg/kg, Na.sup.+ of 1 mg/kg to 1,500 mg/kg, K.sup.+ of 1 mg/kg to 1,500 mg/kg, Mg.sup.2+ of 1 mg/kg to 1,500 mg/kg, Ca.sup.2+ of 1 mg/kg to 1,500 mg/kg, Al.sup.3+ of 1 mg/kg to 1,500 mg/kg, and Sr.sup.2+ of 1 mg/kg to 1,500 mg/kg.

A glass composition includes, as main content components, by mass %, a TeO.sub.2 content percentage of 50% to 80%, a Bi.sub.2O.sub.3 content percentage of 0% to 30%, a WO.sub.3 content percentage of 0% to 30%, a ZnO content percentage of 0% to 30%, a BaO content percentage of 0% to 30%, a GeO.sub.2 content percentage of 0% to 30%, and a Ga.sub.2O.sub.3 content percentage of 0% to 30%, wherein at least any one of additive target elements is introduced, the additive target elements including, Si.sup.4+ of 1 mg/kg to 1,500 mg/kg, B.sup.3+ of 1 mg/kg to 1,500 mg/kg, P.sup.5+ of 1 mg/kg to 1,500 mg/kg, Li.sup.+ of 1 mg/kg to 1,500 mg/kg, Na.sup.+ of 1 mg/kg to 1,500 mg/kg, K.sup.+ of 1 mg/kg to 1,500 mg/kg, Mg.sup.2+ of 1 mg/kg to 1,500 mg/kg, Ca.sup.2+ of 1 mg/kg to 1,500 mg/kg, Al.sup.3+ of 1 mg/kg to 1,500 mg/kg, and Sr.sup.2+ of 1 mg/kg to 1,500 mg/kg.

The invention relates to a process for inscribing a three-dimensional structure formed from variations in refractive index in the bulk of a transparent oxide glass comprising silver ions by femtosecond-laser-beam irradiation, the method comprising: generating a laser beam made up of a series of ultra-brief light pulses of pulse duration shorter than the characteristic time of thermalization of the glass so as to achieve an excitation at the point of irradiation via multi-photon interaction; focusing said beam at a desired depth in the glass; irradiating point by point the glass with said beam so as to form the structure in the glass along a predetermined path, the number of pulses, the repetition rate of the pulses and the irradiance at each irradiation point being controlled to induce an accumulation of silver aggregates localised in an annular peripheral region around an irradiation point, said accumulation of aggregates generating a variation in refractive index in the annular peripheral region around the irradiation point, and to erase a variation in refractive index in a segment of an annular peripheral region generated around another irradiation point when said segment of the peripheral region coincides with a region of the laser beam.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), barium oxide (BaO) and potassium oxide (K.sub.2O) as essential components and may optionally include titania (TiO.sub.2), calcium oxide (CaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), bismuth oxide (Bi.sub.2O.sub.3), strontium oxide (SrO), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), barium oxide (BaO) and potassium oxide (K.sub.2O) as essential components and may optionally include titania (TiO.sub.2), calcium oxide (CaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), bismuth oxide (Bi.sub.2O.sub.3), strontium oxide (SrO), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

The present invention relates to a composition for the remineralization of teeth and to the use thereof. The composition comprises calcium phosphate (CaP) glass, and aqueous silica sol.

The present invention relates to a composition for the remineralization of teeth and to the use thereof. The composition comprises calcium phosphate (CaP) glass, and aqueous silica sol.

Provided is a manufacturing method for a thin phosphor glass plate by which a thin phosphor glass plate can be more certainly produced. A manufacturing method includes the steps of: preparing a phosphor glass base material 21 having a first principal surface 21a and a second principal surface 21b opposed to each other; placing the phosphor glass base material 21 on a stage 22 and fixing the second principal surface 21b onto the stage 22; and polishing the first principal surface 21a of the phosphor glass base material 21 with a polishing member 23 including an abrasive layer 24.

Provided is a phosphate glass that has a low melting point and has excellent water resistance while maintaining a glass structure. This phosphate glass PGS has a glass transition temperature Tg lower than 490° C. and contains, in oxide-based mol %, 55-65 [mol %] of P.sub.2O.sub.5, 10-27 [mol %] of ZnO, 0.5-7 [mol %] of R.sub.2O.sub.3 ((R.sub.2O.sub.3 is at least one of Al.sub.2O.sub.3, Ga.sub.2O.sub.3, and Y.sub.2O.sub.3), 0.5-3.5 [mol %] of a lanthanoid oxide L.sub.2O.sub.3(L.sub.2O.sub.3 is at least one of La.sub.2O.sub.3, Ce.sub.2O.sub.3, Pr.sub.2O.sub.3, Nd.sub.2O.sub.3, Pm.sub.2O.sub.3, Sm.sub.2O.sub.3, Eu.sub.2O.sub.3, Gd.sub.2O.sub.3, Tb.sub.2O.sub.3, Dy.sub.2O.sub.3, Ho.sub.2O.sub.3, Er.sub.2O.sub.3, Tm.sub.2O.sub.3, Yb.sub.2O.sub.3, and Lu.sub.2O.sub.3), and 4-15 [mol %] of X.sub.2O (X.sub.2O is at least one of Li.sub.2O, Na.sub.2O, K.sub.2O, Rb.sub.2O, Cs.sub.2O, and Fr.sub.2O).