CLINICAL APPLICATION OF AUTOLOGOUSPLATELET RICH PLASMA (P.R.P.) IN THEEXTRACTION OF THIRD IMPACTEDMANDIBULAR MOLAR

The impacted third molar surgery has various limits; one of these limit is the type of surgery applied, often demolitive for the patientswith long term consequeses in the post-op period. Aim of our study is to get a better healing of soft and hard tissues with theapplications of PRP in this type of surgery. 5 patients were included in the study with these requests: the impacted or semiimpacted third molar were on both side; the acceptance of PRP tecnique on one side (considered as the case) the extraction ofthe other impacted molar as the controll side to our case; both teeth were extracted on the same day, both sockets were closedby hermetically suturing the flap; on one socket it has been inserted the platelet gel on the other side nothing. Pre operativemesurements were: 1. probing depth of both the seventh (3.7-4.7); 2. ortopantomography (OPT). Post operative measurementsincluded: 1. probing depth two months after surgery; 2. OPT at one weeek, one month, two month.One week after surgery patiens were aked about the post-op through a questionary on the course of the week, in specific theywere asked to assess a score from one to three on swelling and pain of the two side. One week after a clinician who was out of thestudy (not the surgeon) evaluated the eventual bacterial sovrainfections, the dehicence of the flaps, the eventual collateral effectsgiven by the application of PRP giving a score from one to three to the type of healing. Periodontal healing was evaluated on bothside after 2 months after surgery in all the cases treated the initial P.D. was 2-3mms on both sides. It showed an improvement inthe sites treated with P.R.P. Swelling (perceived by the patients during the course of the fist week) was not reduced by theapplication of PRP gel, while there has been a reduction in the pain in comparison with the control side reffered by the patients.Clinical evaluation realized a week after the extractions showed a better healing on the PRP side vs the controll side (total score12 vs 8) where three patients from five realized a primary closure with no bacterial sovrainfection or dehiscence of the flap vs oneprimary closure on the controll side. Bone healing measured by digital OPT did not show a real improvement on PRP side after twomonths in the cases analyze

Unexpected effect of Ru-substitution in lightly doped manganites

In this Communication we report about the unexpected effect of ruthenium doping in sodium ligthly-doped manganites. This effect seems to be in contrast with the usual model applied to describe the effect of this magnetic ion into the manganite structure. We propose a possible compensation mechanism which seems also able to describe other peculiar features encountered in these materials.Comment: 3 pages, 2 Figures to appear in ChemCom

Frustration driven structural distortion in VOMoO4

Nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), magnetization measurements and electronic structure calculations in VOMoO4 are presented. It is found that VOMoO4 is a frustrated two-dimensional antiferromagnet on a square lattice with competing exchange interactions along the side J1 and the diagonal J2 of the square. From magnetization measurements J1+J2 is estimated around 155 K, in satisfactory agreement with the values derived from electronic structure calculations. Around 100 K a structural distortion, possibly driven by the frustration, is evidenced. This distortion induces significant modifications in the NMR and EPR spectra which can be accounted for by valence fluctuations. The analysis of the spectra suggests that the size of the domains where the lattice is distorted progressively grows as the temperature approaches the transition to the magnetic ground state at Tc=42 K

Strong electronic correlations in Lix_xZnPc organic metals

Nuclear magnetic resonance, electron paramagnetic resonance and magnetization measurements show that bulk Li$_x$ZnPc are strongly correlated one-dimensional metals. The temperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ and of the static uniform susceptibility $\chi_S$ on approaching room temperature are characteristic of a Fermi liquid. Moreover, while for $x\simeq 2$ the electrons are delocalized down to low temperature, for $x\to 4$ a tendency towards localization is noticed upon cooling, yielding an increase both in $1/T_1$ and $\chi_s$. The $x$-dependence of the effective density of states at the Fermi level $D(E_F)$ displays a sharp enhancement for $x\simeq 2$, at the half filling of the ZnPc lowest unoccupied molecular orbitals. This suggests that Li$_x$ZnPc is on the edge of a metal-insulator transition where enhanced superconducting fluctuations could develop.Comment: 5 pages, 4 figure

Magnetic properties and spin dynamics in single molecule paramagnets Cu6Fe and Cu6Co

The magnetic properties and the spin dynamics of two molecular magnets have been investigated by magnetization and d.c. susceptibility measurements, Electron Paramagnetic Resonance (EPR) and proton Nuclear Magnetic Resonance (NMR) over a wide range of temperature (1.6-300K) at applied magnetic fields, H=0.5 and 1.5 Tesla. The two molecular magnets consist of CuII(saldmen)(H2O)}6{FeIII(CN)6}](ClO4)38H2O in short Cu6Fe and the analog compound with cobalt, Cu6Co. It is found that in Cu6Fe whose magnetic core is constituted by six Cu2+ ions and one Fe3+ ion all with s=1/2, a weak ferromagnetic interaction between Cu2+ moments through the central Fe3+ ion with J = 0.14 K is present, while in Cu6Co the Co3+ ion is diamagnetic and the weak interaction is antiferromagnetic with J = -1.12 K. The NMR spectra show the presence of non equivalent groups of protons with a measurable contact hyperfine interaction consistent with a small admixture of s-wave function with the d-function of the magnetic ion. The NMR relaxation results are explained in terms of a single ion (Cu2+, Fe3+, Co3+) uncorrelated spin dynamics with an almost temperature independent correlation time due to the weak magnetic exchange interaction. We conclude that the two molecular magnets studied here behave as single molecule paramagnets with a very weak intramolecular interaction, almost of the order of the dipolar intermolecular interaction. Thus they represent a new class of molecular magnets which differ from the single molecule magnets investigated up to now, where the intramolecular interaction is much larger than the intermolecular one