Radically polymerizable, difunctional phenylene sulfide according to Formula I ##STR00001##
in which X, Y independently of each other in each case are absent or are O or NR.sup.6, R.sup.1, R.sup.2 independently of each other in each case are H, a linear or branched C.sub.1 to C.sub.10 alkyl radical, OR.sup.7, SR.sup.8, Cl or Br, R.sup.3 is absent or is a C.sub.1-C.sub.10 alkylene radical which can be interrupted by O or S, R.sup.4 is absent or is a C.sub.1-C.sub.10 alkylene radical which can be interrupted by O or S, wherein R.sup.3 and R.sup.4 cannot be absent at the same time, R.sup.5 is H or a C.sub.1-C.sub.5 alkyl radical, R.sup.6, R.sup.7, R.sup.8 independently of each other in each case are H or a linear or branched C.sub.1 to C.sub.10 alkyl radical, a, b, c, d independently of each other in each case are 0 or 1 and e is 1 or 2.

Radically polymerizable, difunctional phenylene sulfide according to Formula I ##STR00001##
in which X, Y independently of each other in each case are absent or are O or NR.sup.6, R.sup.1, R.sup.2 independently of each other in each case are H, a linear or branched C.sub.1 to C.sub.10 alkyl radical, OR.sup.7, SR.sup.8, Cl or Br, R.sup.3 is absent or is a C.sub.1-C.sub.10 alkylene radical which can be interrupted by O or S, R.sup.4 is absent or is a C.sub.1-C.sub.10 alkylene radical which can be interrupted by O or S, wherein R.sup.3 and R.sup.4 cannot be absent at the same time, R.sup.5 is H or a C.sub.1-C.sub.5 alkyl radical, R.sup.6, R.sup.7, R.sup.8 independently of each other in each case are H or a linear or branched C.sub.1 to C.sub.10 alkyl radical, a, b, c, d independently of each other in each case are 0 or 1 and e is 1 or 2.

Provided is a dental bulk block for grinding processing. The dental bulk block includes a crystalloid, which includes lithium disilicate as a main crystal phase and silicate as a sub-crystal phase, and hyaline as a remainder. The dental bulk block is a functionally gradient material having a crystalline size gradient with respect to a depth thereof and having no interface at a change point of a crystalline size gradient value. The dental bulk block is useful for manufacturing an artificial dental prosthesis that is similar to natural teeth. Accordingly, the time and process for manufacturing the artificial dental prosthesis are shortened, and structural stability is increased in terms of dispersion of force due to gradient functionalization of mechanical properties.

A curable mixture and method of using the mixture are disclosed. In some embodiments, the mixture comprises a calcium silicate compound, a filler material, a non-aqueous carrier liquid, and a secondary carrier liquid, and has properties suitable for use as a tooth filling after curing.

A curable mixture and method of using the mixture are disclosed. In some embodiments, the mixture comprises a calcium silicate compound, a filler material, a non-aqueous carrier liquid, and a secondary carrier liquid, and has properties suitable for use as a tooth filling after curing.

The invention relates to a medical form body of lithium silicate glass ceramic. To increase its strength it is proposed that a surface compressive stress is created in a form body of lithium silicate glass, or containing lithium silicate glass, through the replacement of lithium ions by alkali metal ions of greater diameter. For this purpose the form body is covered with a paste that contains alkali metal.

The invention relates to a medical form body of lithium silicate glass ceramic. To increase its strength it is proposed that a surface compressive stress is created in a form body of lithium silicate glass, or containing lithium silicate glass, through the replacement of lithium ions by alkali metal ions of greater diameter. For this purpose the form body is covered with a paste that contains alkali metal.

To provide a dental porcelain paste which can maintain maintaining the paste state and have excellent application property for a long period of time and hardly causes carbonization or bubbles due to the influence of an organic component or a polymer component during firing. The present invention provides a dental porcelain paste for preparing a dental prosthesis device, comprising: 50.0 to 80.0 wt. % of a glass powder (a) having a maximum particle diameter of 100 m or less and an average particle diameter of 1 to 20 m, 0.5 to 10.0 wt. % of a hydrophobized fine particle silica (b) having an average primary particle diameter of 1 to 50 nm, and 10.0 to 49.5 wt. % of an organic solvent (c) having a boiling point it is within (bp) of 100 to 300 C.

To provide a dental porcelain paste which can maintain maintaining the paste state and have excellent application property for a long period of time and hardly causes carbonization or bubbles due to the influence of an organic component or a polymer component during firing. The present invention provides a dental porcelain paste for preparing a dental prosthesis device, comprising: 50.0 to 80.0 wt. % of a glass powder (a) having a maximum particle diameter of 100 m or less and an average particle diameter of 1 to 20 m, 0.5 to 10.0 wt. % of a hydrophobized fine particle silica (b) having an average primary particle diameter of 1 to 50 nm, and 10.0 to 49.5 wt. % of an organic solvent (c) having a boiling point it is within (bp) of 100 to 300 C.

The invention relates to a kit of parts for preparing a glass ionomer composition for dental use, the kit comprising a Paste A and a Paste B, Paste A comprising water, acid-reactive inorganic filler A, phyllo silicate(s), Paste B comprising water, poly-acid, non acid-reactive filler B, optionally chelating agent. The invention also relates to a hardenable composition obtainable by combining the pastes of the kit or parts and to the use of such a composition as or for preparing a dental cement, dental filling material, dental core build up material or dental root channel filling material.