The physical property evaluation of degradation thermoplastic polylactic acid net-reinforced dental filling material

Abstract

Filling materials are used in root end surgery to seal the cavities of teeth and protecting teeth from saliva and bacterial leakage. This study fabricates nonwoven nets using low-melting point polylactic acid (PLA) fibers. Intermediate restorative material (IRM1, a temporary filling material) is made of zinc oxide powder and eugenol solvent with a 3:1 ratio. IRM is then added with PLA fibers or nets to form the fiberreinforced composite filling material (FFM) or net-reinforced composite filling material (NFM), respectively. FFM and NFM are tested in terms of setting time, compressive strength, solubility, and microleakage to compare the difference between the addition of fibers or nets. The results show that FFM with 2% PLA fibers demonstrates an optimal reinforcing effectiveness and does not cause leaking beyond 40 days after being tested. In addition, it also has better compressive strength than IRM and thus provides greater reinforcement.

Techniques, applications, and prospects of recycled polyethylene terephthalate bottle: A review

“…Polyethylene terephthalate degradation is commonly undertaken using chemical method and mechanical method. 19,[67][68][69][70] In Figure 1 the routes recycling of textile wastes has been illustrated from raw material to customer. It also illustrated the open loop and close loop recycling.…”

Enhanced hydrophilicity of low melting point polylactic acid by butenediol vinyl alcohol copolymer via melt blending

“…The reasons are complicated and can be roughly divided into two aspects. On the one hand, the resinification of bicomponent PLA fibers cannot be completely solved due to the narrow processing temperature window and its own structural characteristics, resulting in poor product comfort and making them difficult to be recognized and accepted by the market [25][26][27][28]. On the other hand, the surface layer (made of ES fibers) of conventional absorbent sanitary products needs to be hydrophilic modified in order to rapidly export the liquid, whereas PLA fibers exhibit poor hydrophilicity, which also seriously limits the application.…”

Flammability and thermal properties of modified carbon nanotubes in poly(lactic acid)

“…Poly(lactic acid) (PLA) as bio-sourced polymeric material has received more extensive attentions and has many advantages such as biodegradability, abundant renewable resources, excellent mechanical properties including high strength and high stiffness, appropriate thermal properties, and electrical properties. 1 –4 PLA represents one of the most promising bio-sourced polymers and can be widely used in electronic products, packaging field, and disposable products. Nevertheless, PLA resin is a highly flammable material with serious melt dripping during combustion, which severely limits its potential applications.…”