A dental appliance made of an olefin polymer is directly formed via rapid prototyping without the use of an intermediary physical mold. A polymer precursor solution includes one or more olefin-containing monomers and/or oligomers, an olefin polymerization catalyst, and a UV absorbing agent to limit penetration of the UV light through the polymer precursor solution. One or more reactions of the polymer precursor solution are modulated in response to UV light, and the polymer precursor solution may further include an inhibitor configured to modulate those reactions. The polymer precursor solution can be deposited using UV-cured stereolithographic or 3D printing methods to form appliances exhibiting improved elongation at break characteristics and suitable stress resistance.一種由烯烴聚合物製得的牙科器具，其係直接經由快速原型形成而沒有使用中間實體模具。一聚合物前驅物溶液包括一或多種含烯烴單體及/或寡聚物、一烯烴聚合觸媒及一限制UV光穿透過該聚合物前驅物溶液的UV吸收劑。該聚合物前驅物溶液之一或多種反應係因應UV光而調節，及該聚合物前驅物溶液可進一步包括一組態成調節那些反應的抑制劑。該聚合物前驅物溶液可使用經UV固化的立體光刻或3D列印方法沈積，以形成具有改良的斷裂伸張率特徵及合適的抗應力性之器具。
