Safety of the Immediate Reconstitution of Poly-l-Lactic Acid for Facial and Body Treatment-A Multicenter Retrospective Study.

Background: Poly-l-lactic acid (PLLA-SCA; Sculptra) was approved in 1999 in Europe and 2004 in United States as a collagen biostimulator. It is a freeze-dried preparation containing 150 mg PLLA-SCA per vial and, since approval, has been recommended to be reconstituted 72 h before treatment, which can hinder its use in clinical practice. In 2021, the manufacturer authorized the reconstitution of PLLA-SCA immediately before use.

Mechanical and physical properties of polyester polymer concrete using recycled aggregates from concrete sleepers.

Currently, reuse of solid waste from disused infrastructures is an important environmental issue to study. In this research, polymer concrete was developed by mixing orthophthalic unsaturated polyester resin, artificial microfillers (calcium carbonate), and waste aggregates (basalt and limestone) coming from the recycling process of concrete sleepers. The variation of the mechanical and physical properties of the polymer concrete (compressive strength, flexural strength, modulus of elasticity, density, and water absorption) was analyzed based on the modification of different variables: nature of the recycled aggregates, resin contents (11 wt%, 12 wt%, and 13 wt%), and particle-size distributions of microfillers used.