Comparative mechanical testing for different orthodontic aligner materials over time - in vitro study

Effectiveness and Biocompatibility of Tooth Aligners Made from Polyethylene Terephthalate Glycol (PeT-G), Polypropylene (PP), Polycarbonate (PC), Thermoplastic Polyurethanes (TPUs), and Ethylene-Vinyl Acetate (EVA): A Systematic Review

“…Clear aligners, regardless of material, can treat a wide range of malocclusions. [ 6 7 8 9 10 ] Aligners are in direct contact with oral tissues during therapy; hence, biocompatibility is important. All aligner materials had low adverse effects and good biocompatibility in most trials.…”

“…PeT-G, PP, PC, TPU, and EVA aligners did not significantly affect malocclusion correction or treatment duration [ Table 1 ]. [ 6 7 8 9 10 ] Biocompatibility: Patient-reported discomfort, tissue reaction, and material-related adverse events assessed aligner biocompatibility. Most investigations found few adverse effects and good biocompatibility for all materials.…”

An in vitro evaluation of aligner force decay in artificial saliva

“…2 ) according to the method of Nowak et al. 11 To measure the aligner force, a thin-film pressure sensor (Micro Sensor Co., Ltd. Thief River Falls, MN, USA) was placed in the position of the removed right central incisor in the M t model, and the reading of the sensor was confirmed as zero. The aligner was then removed and reinserted into the M t model, and the aligner force value was measured ( Fig.…”

“… 10 The rebound pressure of aligner found no significant differences among the different brands. 11 Above studies were conducted their experiments with invisible aligners placed in air without considering the effects of humidity and temperature in the oral environment. The stress release of the thermal forming plate is accelerated in the humid and hot environment of the oral cavity compared to in air.…”

Mechanical properties of orthodontic aligners: A review of the literature

“…Currently, esthetics is one of the most important factors when it comes to accepting treatment. It has been proven that adult patients tend to prefer clear aligners over conventional brackets [4,5,6], since the latter are often the main cause of bacterial plaque accumulation which causes a higher risk of caries, gingivitis and even periodontitis, which obviously alters and affects oral health. To avoid this problem and others such as root resorption [7], clear orthodontic aligners (TOA) have been introduced as an alternative to fixed treatments [8] as these, in addition to improving esthetics, provide comfort and better oral hygiene for the patient [9].…”