A radically polymerizable composition having at least one acidic radically polymerizable monomer, at least one fluoroaluminosilicate glass filler and/or radiopaque glass filler, and at least one masking agent in solid form.

The present invention provides a dental polymerizable composition that requires less discharging force, is easily formable, has low polymerization shrinkage stress during curing, and exhibits high stain resistance and surface gloss when cured. The present invention relates to a dental polymerizable composition including a (meth)acrylic block copolymer (A), a polymerizable monomer (B), and a polymerization initiator (C). The (meth)acrylic block copolymer (A) consists of a (meth)acrylic polymer block (a) having a curable functional group and a (meth)acrylic polymer block (b) having no curable functional group. The curable functional group has a partial structure represented by the following general formula (1):

##STR00001##

Dental materials may be made from polyhydric phenols that are non-genotoxic and exhibit estrogenic activity less than that of bisphenol S, while exhibiting properties such as strength and flexibility comparable to those of conventional BPA-derived dental materials.

The present invention relates to a kit of parts comprising Part A and Part B, Part A comprising: ascorbic acid, component(s) comprising an ascorbic acid moiety or derivative(s) thereof, optionally polymerizable component(s) without acidic moieties, optionally polymerizable component(s) with acidic moieties, and optionally filler(s), Part B comprising polymerizable component(s) without acidic moieties, polymerizable component(s) with acidic moieties, transition metal component(s), organic peroxide(s), and optionally filler(s), The invention is also directed to a redox initiator system comprising ascorbic acid, component(s) comprising an ascorbic acid moiety or derivative(s) thereof, transition metal component(s), preferably comprising a copper or iron ion containing salt, organic peroxide(s), preferably comprising a hydroperoxide or di-peroxide. The kit of parts and redox initiator system are particularly useful in the dental field.

A redox curing dental composition comprising: a. one or more compounds having a radical polymerizable carbon-carbon double bond; b. a redox initiator system comprising
a reducing agent which is a compound of the following formula (I):

##STR00001## wherein R.sup.1 and R.sup.2 which may be the same or different, independently represent a C.sub.1-18 hydrocarbyl group, or R.sup.1 and R.sup.2 form together with the silicon atom to which they are bonded a 3 to 8-membered silicon-containing alicyclic ring, which groups R.sup.1 and/or R.sup.2 may be substituted with one to three substituents selected from the group consisting of a C.sub.1-6 alkoxy group, a halogen atom, or a carboxylic acid group; and
(ii) an oxidizing agent adapted to oxidize the reducing agent of formula (I) in the absence of light for generating a radical capable of initiating radical polymerization of the one or more compounds having a radical polymerizable carbon-carbon double bond.

A redox curing dental composition comprising: a. one or more compounds having a radical polymerizable carbon-carbon double bond; b. a redox initiator system comprising
a reducing agent which is a compound of the following formula (I):

##STR00001## wherein R.sup.1 and R.sup.2 which may be the same or different, independently represent a C.sub.1-18 hydrocarbyl group, or R.sup.1 and R.sup.2 form together with the silicon atom to which they are bonded a 3 to 8-membered silicon-containing alicyclic ring, which groups R.sup.1 and/or R.sup.2 may be substituted with one to three substituents selected from the group consisting of a C.sub.1-6 alkoxy group, a halogen atom, or a carboxylic acid group; and
(ii) an oxidizing agent adapted to oxidize the reducing agent of formula (I) in the absence of light for generating a radical capable of initiating radical polymerization of the one or more compounds having a radical polymerizable carbon-carbon double bond.

Radically polymerizable dental material, which includes a combination of at least three thiourea derivatives, a hydroperoxide and preferably a transition metal compound as initiator system for the radical polymerization.

Radically polymerizable dental material, which includes a combination of at least three thiourea derivatives, a hydroperoxide and preferably a transition metal compound as initiator system for the radical polymerization.

An object of the present disclosure is to provide a dental composition that can exhibit sufficient curability even in a state where moisture is excessive as in the oral environment. The dental composition of the present disclosure contains component (a): monomer containing (meth)acrylamide group represented by formula (1): ##STR00001##
(In formula, R represents a hydrogen atom or a methyl group and Rs may be the same or different from each other. R2 is an alkyl group having 2 to 6 carbon atoms and R2s may be the same or different from each other.)

The invention relates to a two-part dual cure dental composition with improved stability toward discoloration and premature polymerization. The dental composition comprises a Base Part and a Catalyst Part, the Base Part comprising polymerizable component(s) without an acidic moiety, optionally polymerizable component(s) with an acidic moiety, filler(s), transition metal component(s), peroxide component(s), stabilizer component(s) comprising a free-radical moiety, the Catalyst Part comprising polymerizable component(s) without an acidic moiety, filler(s), ascorbic acid component, photo-initiator system, stabilizer component(s) comprising a phosphite or sulfite moiety. The dental composition is in particular useful as bulk fill dental composite, dental resin cement, core build-up dental material or self- and dual cure dental adhesive. The invention further relates to an initiator system and the use of a stabilizer comprising a free-radical moiety.