Dental prosthetic appliance

1 . A dental prosthetic appliance comprising a plastic material, wherein the plastic material is a saponified ethylene-vinyl ester copolymer.

2 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer is a saponified ethylene-vinyl acetate copolymer.

3 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an ethylene structural unit content of 1 to 70 mole %.

4 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an ethylene structural unit content of 10 to 60 mole %.

5 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an ethylene structural unit content of 20 to 55 mole %.

6 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an ethylene structural unit content of 25 to 50 mole %.

7 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an average saponification degree of 80 to 100 mole %.

8 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an average saponification degree of 90 to 100 mole %.

9 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an average saponification degree of 95 to 100 mole %.

10 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has an average saponification degree of 99 to 100 mole %.

11 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a remaining amount of sodium acetate of 1,000 ppm or less, in terms of sodium.

12 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a remaining amount of sodium acetate of 500 ppm or less, in terms of sodium.

13 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a remaining amount of sodium acetate of 300 ppm or less, in terms of sodium.

14 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a melt flow rate at 210° C. under a load of 2,160 g of 0.5 to 100 g/10 minutes.

15 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a melt flow rate at 210° C. under a load of 2,160 g of 1 to 50 g/10 minutes.

16 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a melt flow rate at 210° C. under a load of 2,160 g of 3 to 40 g/10 minutes.

17 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a contact angle with water of 5° to 85°.

18 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a contact angle with water of 30° to 80°.

19 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer has a flexural elasticity from 1 to 9.9 Gpa.

20 . The dental prosthetic appliance according to claim 1 , which contains a filler in an amount of from 0.5 to 45 parts by weight.

21 . The dental-prosthetic appliance according to claim 1 , wherein the saponified-ethylene-vinyl ester copolymer further contains a 1,2-diol structural unit represented by the following formula (1):

wherein R 1 , R 2 and R 3 each independently represents a hydrogen atom or an organic group, X represents a single bond or linking chain, and R 4 , R 5 and R 6 each independently represents a hydrogen atom or an organic group.

22 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer further contains a 1,2-diol structural unit represented by the following formula (1) from 0.1 to 20 mole %:

wherein R 1 , R 2 and R 3 each independently represents a hydrogen atom or an organic group, X represents a single bond or linking chain, and R 4 , R 5 and R 6 each independently represents a hydrogen atom or an organic group.

23 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer is a saponified ethylene-vinyl acetate copolymer, which has an ethylene structural unit content of 10 to 60 mole %, has an average saponification degree of 80 to 100 mole %, has a melt flow rate at 210° C. under a load of 2,160 g of 0.5 to 100 g/10 minutes, and has a contact angle with water of 5° to 85°, and has a flexural modulus of 1 GPa to 9.9 GPa.

24 . The dental prosthetic appliance according to claim 1 , wherein the saponified ethylene-vinyl ester copolymer is a saponified ethylene-vinyl acetate copolymer, which has an ethylene structural unit content of 10 to 60 mole %, has an average saponification degree of 80 to 100 mole %, has a melt flow rate at 210° C. under a load of 2,160 g of 0.5 to 100 g/10 minutes, has a contact angle with water of 5° to 85°, has a remaining amount of sodium acetate of 1,000 ppm or less, in terms of sodium, and has a flexural modulus of 1 GPa to 9.9 GPa.

25 . The dental prosthetic appliance according to claim 1 , which is a denture base.

26 . The dental prosthetic appliance according to claim 1 , which is a denture fitting member.

27 . The dental prosthetic appliance according to claim 26 , wherein the denture fitting member has a flexural modulus of 2 GPa to 9.9 GPa.