This work aims at analyzing the energy efficiency of the chemical recycling process of polylactic acid (PLA) and its sustainability from an environmental point of view. The results show that the production of lactic acid from chemical depolymerization of PLA is preferable, from an energy point of view, to the production of lactic acid by glucose fermentation. The study also shows that the environmental footprint of the analyzed process is larger than that of the PLA mechanical recycling

Introduction. The aim of this study is to demonstrate the effectiveness of addition of the antimicrobial photodynamic therapy to the conventional approach in the treatment of peri-implantitis. Materials and Methods. Forty patients were randomly assigned to test or control groups. Patients were assessed at baseline and at six (T1), twelve (T2), and twenty-four (T3) weeks recording plaque index (PlI), probing pocket depth (PPD), and bleeding on probing (BOP); control group received conventional periodontal therapy, while test group received photodynamic therapy in addition to it. Result. Test group showed a 70% reduction in the plaque index values and a 60% reduction in PD values compared to the baseline. BOP and suppuration were not detectable. Control group showed a significative reduction in plaque index and PD. Discussion. Laser therapy has some advantages in comparison to traditional therapy, with faster and greater healing of the wound. Conclusion. Test group showed after 24 weeks a better value in terms of PPD, BOP, and PlI, with an average pocket depth value of 2 mm, if compared with control group (3 mm). Our results suggest that antimicrobial photodynamic therapy with diode laser and phenothiazine chloride represents a reliable adjunctive treatment to conventional therapy. Photodynamic therapy should, however, be considered a coadjuvant in the treatment of peri-implantitis associated with mechanical (scaling) and surgical (grafts) treatments.

We study temperature chaos in a two-dimensional Ising spin glass with random quenched bimodal couplings, by an exact computation of the partition functions on large systems. We study two temperature correlators from the total free energy and from the domain wall free energy: in the second case we detect a chaotic behavior. We determine and discuss the chaos exponent and the fractal dimension of the domain walls.PACS numbers: 75.10. Nr, 05.50.+q, 75.40.Gb, 75.40.Mg Introduction -A characteristic feature of spin glasses is the presence of chaos under small changes in the quenched couplings, in the temperature, or in the magnetic field [1,2,3,4,5,6,7,8,9]. With the expression temperature chaos we refer to the fragility of the equilibrium states of a disordered system under small temperature changes. Let us consider two typical equilibrium configurations of such a system under the same realization of the quenched disorder: the first configuration is in equilibrium at temperature T , while the second one is in equilibrium at temperature T ′ = T + ∆T . One says that there is temperature chaos if for arbitrarily small (but non-zero) values of ∆T , the typical overlap of two configurations at T and T ′ goes to zero when the system size diverges. The spatial distance ℓ(T, ∆T ) over which such overlaps decay is called the chaos length, and, as we will discuss better in the following, it scales as ℓ ∼ ∆T

Background. The objective of this study is to describe and assess the effectiveness and acceptability of a modern tailored protocol of oral hygiene, based on the concordance between professionals and patients, and based on the proper choice of best tools for oral hygiene regardless of the technique used. This new method has been called Tailored Brushing Method (TBM). Material and methods. Two groups of adult patients (n=200) were involved in this research, according to specific inclusion criteria. Test group followed the indications of the new Tailored Brushing Method, while control group was involved in a standard protocol of oral hygiene with the suggestions of a brushing technique and the typical approach based on the compliance. Plaque Index, bleeding on Probing index and patients' acceptability of the methods (Visual Analog Scale) were assessed at different time points. Descriptive and statistical analyses were performed. Results and conclusions. Test group had statistically lower Plaque Index and Bleeding on Probing after 30 days, in comparison with control group. Test group expressed a better acceptance of the new tailored method. This research suggests to use a tailored approach to oral hygiene, overcoming the need of patient's compliance, often affected by bias such as alteration of the protocols and wrong brushing maneuvers.

The present letter to editor comments the manuscript "Caliskan SG, Kilic MA, Bilgin MD. Acute effects of energy drink on hemodynamic and electrophysiologic parameters in habitual and non-habitual caffeine consumers.