Internal- vs external-connection single implants: A retrospective study in an italian population treated by certified prosthodontists

Purpose: The design of an implant connection that allows prosthetic suprastructures to be attached to implants has long been debated in the dental literature. The goal of this retrospective study was to evaluate the 5-year clinical results for a large number of single implants restored by certified prosthodontists in an attempt to establish whether different clinical outcomes could be detected for external- or internalconnection implants. Materials and Methods: All single implants with internal or external connections inserted in 27 private dental practices from January 1, 2003 to December 31, 2007 were evaluated. An initial statistical analysis was performed to describe the sample population at baseline and then to compare the two types of implant-abutment connection configurations and their clinical outcomes. All data were statistically analyzed with STATA12 (StataCorp). Results: Twenty-eight of the 85 active members of the Italian Academy of Prosthetic Dentistry (AIOP) participated in this study. The sample included 1,159 patients and 2,010 implants. Of the implants, 75 were dropped because there was no information about follow-up. Of the remaining implants, 1,431 (74.0%) were followed for at least 5 years, and 332 implants (17.2%) were followed for more than 8 years. Nearly 99% (98.9%) of the implants survived. The difference between the survival frequencies of the two types of implant-abutment connection configurations was not significant for each negative event (log-rank test, P > .05). There was no difference between the two types of implants regarding restoration fracture, implant screw loosening, and peri-implant disease. Conclusion: Within the limitations of this study, it can be suggested that there is no difference in clinical outcomes of single restorations joined to internal- or external-connection implants

First measurements of the total proton-proton cross section at the LHC energy of 1as =7TeV

TOTEM has measured the differential cross-section for elastic proton-proton scattering at the LHC energy of analysing data from a short run with dedicated large-\u3b2* optics. A single exponential fit with a slope B=(20.1\ub10.2stat\ub10.3syst) GeV 122 describes the range of the four-momentum transfer squared |t| from 0.02 to 0.33 GeV2. After the extrapolation to |t|=0, a total elastic scattering cross-section of (24.8\ub10.2stat\ub11.2syst) mb was obtained. Applying the optical theorem and using the luminosity measurement from CMS, a total proton-proton cross-section of (98.3\ub10.2stat\ub12.8syst) mb was deduced which is in good agreement with the expectation from the overall fit of previously measured data over a large range of center-of-mass energies. From the total and elastic pp cross-section measurements, an inelastic pp cross-section of was inferred

Measurement of the forward charged particle pseudorapidity density in pp collisions at root s=8 TeV using a displaced interaction point

The pseudorapidity density of charged particles dN(ch)/d(eta) is measured by the TOTEM experiment in proton-proton collisions at root s = 8 TeV within the range 3.9 < eta < 4.7 and -6.95 < eta < -6.9. Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal interaction point. The data sample is expected to include 96-97 % of the inelastic proton-proton interactions. The measurement reported here considers charged particles with p(T) > 0 MeV/c, produced in inelastic interactions with at least one charged particle in -7 < eta < -6 or 3.7 < eta < 4.8. The dN(ch)/d eta has been found to decrease with vertical bar eta vertical bar, from 5.11 +/- 0.73 at eta = 3.95 to 1.81 +/- 0.56 at eta = -6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement

Measurement of B0→Ds(*)+D*- branching fractions and B0→Ds*+D*- polarization with a partial reconstruction technique

We present a study of the decays B0→Ds(*)+D*-, using 20.8 fb-1 of e+e- annihilation data recorded with the BABAR detector. The analysis is conducted with a partial reconstruction technique, in which only the Ds(*)+ and the soft pion from the D*- decay are reconstructed. We measure the branching fractions B(B0→Ds+D*-)=(1.03±0.14±0.13±0.26)% and B(B0→Ds*+D*-)=(1.97±0.15±0.30±0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the Ds+→φπ+ branching fraction uncertainty. From the B0→Ds*+D*- angular distributions, we measure the fraction of longitudinal polarization ΓL/Γ=(51.9±5.0±2.8)%, which is consistent with theoretical predictions based on factorization

Measurements of Branching Fractions and Dalitz Distributions for B0→D(*)±K0π∓ Decays

We present measurements of the branching fractions for the three-body decays B0→D(*)∓K0π± and their resonant submodes B0→D(*)∓K*± using a sample of approximately 88×106 BB̅ pairs collected by the BABAR detector at the SLAC PEP-II asymmetric energy storage ring. We measure: B(B0→D∓K0π±)=(4.9±0.7stat±0.5syst)×10-4, B(B0→D*∓K0π±)=(3.0±0.7stat±0.3syst)×10-4, B(B0→D∓K*±)=(4.6±0.6stat±0.5syst)×10-4, B(B0→D*∓K*±)=(3.2±0.6stat±0.3syst)×10-4. From these measurements we determine the fractions of resonant events to be f(B0→D∓K*±)=0.63±0.08stat±0.04syst and f(B0→D*∓K*±)=0.72±0.14stat±0.05syst

Measurement of the Branching Fractions and CP Asymmetry of B-→D(CP)0K- Decays with the BABAR Detector

The measurement of R, Rcp+, and Acp+ were presented. B- → D° K-decays with D° mesons decaying to non-CP and CP-even eigenstates were reconstructed. It was observed that the charged-particle tracking was provided by a five-layer silicon vertex tracker (SVT). It was shown that the parametrization of the particle identication PDF was performed by fitting with a Gaussian distribution

Search for the Rare Decays B0→Ds(∗)+a0(2)−B^0 \to D_s^{(*)+} a_{0(2)}^-

8 pages, 8 postscript figures, submitted to PRD-RCWe have searched for the decays $B^0 \rightarrow D_s^{+}a_0^-$, $B^0 \rightarrow D_s^{*+}a_0^-$, $B^0 \rightarrow D_s^{+}a_2^-$ and $B^0 \rightarrow D_s^{*+}a_2^-$ in a sample of about 230 million $\Upsilon(4S) \rightarrow B{\bar B}$ decays collected with the {\sl BaBar} detector at the PEP-II asymmetric-energy $B$-factory at SLAC. We find no evidence for these decays and set upper limits at 90\% C.L. on the branching fractions: ${\cal B}(B^0 \rightarrow D_s^+ a_0^-) < 1.9\times 10^{-5}$, ${\cal B}(B^0 \rightarrow D_s^{*+} a_0^-) < 3.6\times 10^{-5}$, ${\cal B}(B^0 \rightarrow D_s^+ a_2^-) < 1.9 \times 10^{-4}$, and ${\cal B}(B^0 \rightarrow D_s^{*+} a_2^-) < 2.0\times 10^{-4}$