Photopolymerizable single-component crown and bridge material

• US 20060229377A1
• Filed: 03/29/2006
• Published: 10/12/2006
• Est. Priority Date: 04/11/2005
• Status: Abandoned Application

• Current Assignee: Kettenbach GmbH & Co. KG
• Original Assignee: Kettenbach GmbH & Co. KG
• Inventors: Reber, Jens-Peter, Bublewitz, Alexander, Suchan, Matthias
• Application Number:
  US11/392,418
• Publication Number:
  US 20060229377A1
• Time in Patent Office: Days
• US Class Current: 522/7
• CPC Class Codes: A61K 6/62 Photochemical radical initiators
• CPC Class Codes: A61K 6/887 Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08F 2/48 by ultraviolet or visible light

Abstract

A photopolymerizable single-component dental material, that is useful as a temporary, photopolymerizable single-component crown and bridge material. The material contains at least one compound that can be polymerized by means of photoinitiation, at least one photoinitiator, and filler, if necessary.

Claims

1. A photopolymerizable single-component dental material, comprising:

at least one compound adapted to be polymerized by photoinitiation; and

at least one photoinitiator,

wherein the dental material in a first, plastic state, has a viscosity of 10 to 100,000 Pa·

s, or a consistency (analogous to ISO

     4823) of 50 to 15 mm, and wherein after a first photoinitiation, makes a transition into an elastic state, in which the material has a modulus of elasticity between 1 and 50 MPa, such that the elastic state is maintained for at least 15 seconds, before the dental material reaches a duroplastic end state either directly or after a second photoinitiation, in which the material reaches a modulus of elasticity of at least 1,000 MPa and a bending strength of at least 90 MPa.

2. Single-component dental material according to claim 1, wherein in the first, plastic state, the material has a viscosity between 10 and 10,000 Pa·

s and a consistency (analogous to ISO

     4823) between 50 and 18 mm.

3. Single-component dental material according to claim 1, wherein the elastic state lasts over a period of 15 to 75 seconds.

4. Single-component dental material according to claim 1, wherein the material has a modulus of elasticity, measured analogous to ISO 10477, between 2 and 45 MPa during the elastic state.

5. Single-component dental material according to claim 1, wherein the increase in modulus of elasticity during the elastic phase amounts to between 0.5 and 0.0001 MPa/second.

6. Single-component dental material according claim 1, wherein the material reaches the duroplastic end state after a second photoinitiation, within 5 to 240 seconds.

7. Single-component dental material according to claim 1, wherein when the material is in the duroplastic end state, it has a modulus of elasticity in a bending test of greater than or equal to 2,000 MPa.

8. A single-component dental material according to claim 1, wherein when the material is in the duroplastic end state, it has a Barcol hardness greater than or equal to 40.

9. A single-component dental material according to claim 1, wherein the material contains:

a) 0.01 to 3 wt.-% of the at least one photoinitiator;

b) 0 to 10 wt.-%, of at least one co-photoinitiator;

c) 0.01 to 1.0 wt.-%, of at least one photoretarder or stabilizer;

d) 0.1 to 99 wt.-%, of the at least one photopolymerizable compound;

e1) 0 to 80 wt.-%, of at least one nanoparticle e1), having a particle size distribution between 5 and 35 nm;

e2) 0 to 60 wt.-%, of at least one reinforcing filler, said filler having a BET surface of at least 50 m²/g;

e3) 0 to 70 wt.-%, of at least one semi-reinforcing filler having a BET surface of 35 m²/g±

10 m²/g;

e4) 0 to 90 wt.-%, of at least one non-reinforcing filler, having a grain size of 0.1 mm to 30 mm; and

f) 0-10% additives.

10. Single-component dental material according to claim 1, wherein the material contains:

a) 0.01 to 3 wt.-%, of the at least one photoinitiator, which is selected from the group consisting of camphor quinone and Lucirin TPO;

b) 0.01 to 1.0 wt.-%, of at least one photoretarder or stabilizer, said photoretarder or stabilizer being a compound selected from the group consisting of hydroxyanisol, di-tert-butyl hydroxytoluene, di-tert-butyl hydroxyanisol, and combinations thereof; and

c) the at least one photopolymerizable compound;

wherein a molar ratio of photoinitiator a) to photoretarder b) is between 0.5;

1 and 250;

1.

11. Single-component dental material according to claim 1, wherein the material comprises:

a) 0.01 to 3 wt.-%, of the at least one photoinitiator selected from the group consisting of camphor quinone and Lucirin TPO;

b) 0 to 10 wt.-%, of at least one co-photoinitiator selected from the group consisting of 4-dimethylaminobenzoic acid ethyl ester and 4-cyanoethyl aniline;

c) 0.01 to 1.0 wt.-%, of at least one photoretarder or stabilizer selected from the group consisting of hydroxyanisol, di-tert-butyl hydroxytoluene, di-tert-butyl hydroxyanisol, and combinations thereof; and

d) the at least one photopolymerizable compound, wherein a molar ratio of photoinitiator a) to co-photoinitiator b) is between 1;

1 and 1;

5, and a ratio of photoinitiator a) to photoretarder c) is between 1;

1 and 1;

25.

12. Single-component dental material according to claim 1, wherein the material comprises;

a) the at least one photoinitiator selected from the group consisting of camphor quinone and Lucirin TPO;

b) at least one co-photoinitiator selected from the group consisting of 4-dimethylaminobenzoic acid ethyl ester and/or 4-cyanoethyl aniline;

c) at least one photoretarder or stabilizer selected from the group consisting of hydroxyanisol, di-tert-butyl hydroxytoluene, di-tert-butyl hydroxyanisol, and combinations thereof, and;

d) the at least one photopolymerizable compound,

wherein a molar ratio of photoinitiator a) to co-photoinitiator b) is between 250;

1 and 1;

1, and a ratio of photoinitiator a) to photoretarder c) is between 75;

1 and 1;

1.

13. Single-component dental material according to claim 1, wherein the material further comprises a reinforcing filler comprising silanated, pyrogenic silicic acid having a BET surface of 35 m²/g±

10 m²/g and a carbon content of 1.5 to 3.5 wt.-%.