The effect of time on mechanical properties of biocompatible photopolymer resins used for fabrication of clear dental aligners

Clear dental aligners are used for treating orthodontic anomalies (misaligned teeth, inappropriate contact between upper and lower teeth etc.), minor irregularities bruxism. Using additive manufacturing technologies clear made of biocompatible photopolymer, using a vat photopolymerization technology. One problems in application is the change aligner material properties after production, including strength elongation at failure. This can cause different sequence tooth displacement which will not correspond to planned therapy. In this paper three types testing conducted i.e., tensile, compressive three-point bending on specimens 1 (24 h), 3 (72 5 (120 h) 7 (168 days old. Mechanical properties, such as flexural strain failure monitored order show effect time photopolymer resin.