Composition for forming transparent orthodontic device, method of preparing transparent orthodontic device, and transparent orthodontic device prepared by using the method

A composition for forming a transparent orthodontic device, the composition comprising:

• 100 parts by weight of a first photocurable compound represented by Formula 1;
• 35 to 75 parts by weight of a second photocurable compound represented by Formula 2;
• 15 to 65 parts by weight of a third photocurable compound represented by Formula 3;
• 5 to 40 parts by weight of a fourth photocurable compound represented by Formula 4;
• 1 to 15 parts by weight of a fifth photocurable compound represented by Formula 5,
• 0.5 to 5 parts by weight of an acrylic resin based on a total weight of the first, second, third, fourth, and fifth photocurable compounds being 100 parts by weight;
• and
• 1 to 20 parts by weight of a photoinitiator based on the total weight of the first, second, third, fourth, and fifth photocurable compounds:
• R′CH2[C(CH3)(R)CH2]2CH2R′(R═H or CH3,R′═NHCO2CH2CH2O2CC(CH3)═CH2) [Formula 1]
• CH2═C(CH3)COOCH2CH2OH [Formula 3]
• CH2═C(CH3)COO(CH2CH2O)3COC(CH3)═CH2. [Formula 5]