Fracture Resistance of Incisal Fragments Following Reattachment With Different Techniques in Simulated Crown Fractures

Introduction: The aim of the present study was to evaluate and compare the effect of acid-etching and Er, Cr:YSGG laser treatment before the reattachment of incisal fragments in coronal fractures of permanent incisor teeth.Methods: Sixty-six sound human maxillary incisors were randomly divided into 3 groups (n=22). Teeth were embedded in self-cure acrylic resins by leaving one-third of the crowns out, and uncomplicated crown fractures were obtained using an Instron testing device. The fragments were reattached using 3 different procedures and a hybrid resin composite (Z250): Group I: Acid etching + Prime & Bond NT; Group II: Er,Cr:YSGG + Prime & Bond NT; Group III: Er,Cr:YSGG + Acid etching + Prime & Bond NT. The percentages of shear bond strengths were determined by comparing fracture strengths of sound and reattached teeth for 3 groups. All data were analyzed statistically with Kruskal-Wallis H test.Results: Mean fracture strengths of the reattached fragments were between 51.02% and 62.93% of that of the sound teeth in all groups. Group I had significantly higher percentages of shear bond strength values (P < 0.05) when compared to group II and group III. No significant difference (P > 0.05) was found between group II and group III.Conclusion: The findings of the present study show that Er,Cr:YSGG laser irradiation prior to the reattachment of incisal fragments has a negative effect on fracture strength

A Rare Cause of Dyspnea: Sudden Rupture of Aortic Valsalva Sinus Aneurysm

Aneurysm of the sinus of Valsalva is an uncommon cardiac abnormality; however, the most common complication is rupture into the right heart chambers or rarely towards the left chambers. A ruptured aneurysm typically leads to an aortocardiac shunt and progressively worsening heart failure. We report a case of a 21-year-old male who suffered an aneurysm of the sinus of Valsalva rupture into the right atrium who underwent successful surgical repair

Two-parameter deformed supersymmetric oscillators with SUq1/q2 (n vertical bar m)-covariance

A two-parameter deformed superoscillator system with SUq1/q2 (n/m)-covariance is presented and used to construct a two-parameter deformed N = 2 SUSY algebra. The Fock space representation of the algebra is discussed and the deformed Hamiltonian for such generalized superoscillators is obtained. Finally, some physical applications of the two parameter deformed superoscillators algebra with the quantum supergroup SUq1/q2 (n/m)-symmetry are also discussed in detail. (C) 2009 Elsevier B.V. All rights reserved

High temperature thermostatistics of fermionic Fibonacci oscillators with intermediate statistics

In this study, we pursue an original idea about whether unique deformed particle algebra could effectively describe a set of crucial quantum properties including the non-standard statistics of particles, the internal structure of particles, and the interaction of particles. Following such an idea, we consider a specific Fermi gas model containing the two-parameter deformed fermionic particles called fermionic Fibonacci oscillators. For such a system, several thermostatistical functions such as the total number of particles, the internal energy, and the entropy are calculated in the thermodynamical limit by means of some properties of the Fibonacci calculus. A virial expansion of the equation of state for the system is also obtained, and the first five virial coefficients are derived in terms of the real independent deformation parameters q and p. From the results obtained here, it is first found that for two and three spatial dimensions, the present deformed Fermi gas model shows an interpolation between fermionic and boson-like systems, and secondly, it is concluded that the two-parameter deformation of fermions leads to a suitable framework for an effective description of interacting composite particle systems. (C) 2014 Elsevier B.V. All rights reserved

The multi-dimensional q-deformed bosonic Newton oscillator and its inhomogeneous quantum invariance group

We obtain the inhomogeneous invariance quantum group for the multi-dimensional q-deformed bosonic Newton oscillator algebra. The homogenous part of this quantum group is given by the multiparameter quantum group GL(X;qij) (n) Schirrmacher where q(ij)'s take some special values. We find the R-matrix which gives the non-commuting structure of the quantum group for the two dimensional case

THE INHOMOGENEOUS QUANTUM INVARIANCE GROUP OF q-DEFORMED BOSON ALGEBRA

We investigate the inhomogeneous invariance group of the q-deformed boson algebra. We find the R-matrix which gives the noncommuting structure of the quantum group with RM(1)M(2) = M(2)M(1)R relation

s-deformed particle algebras and the addition of s

We begin by considering a system which gives the usual fermion algebra when the appropriate limiting case is considered. We study its Hopf algebra structure. Investigation of its representation forces us to impose additional constraints on the system such that by defining a central hermitian operator s in terms of the operators defining the system, we obtain s-deformed particle algebra. Finally, we find a formula for the addition of s values for the d = 2 case

The inhomogeneous quantum invariance group of the multi-dimensional q-deformed boson algebra

In this study we introduce a multi-dimensional q-deformed boson algebra and calculate its inhomogeneous invariance quantum group

The Inhomogeneous Quantum Invariance Group of The Two Parameter Deformed Boson Algebra

We consider two parameter deformed boson algebra and investigate the inhomogeneous invariance quantum group of this system. We find the R-matrix which collects all information about the non-commuting structure of the quantum group. We extend our study to the d-dimensional case

THE INHOMOGENEOUS INVARIANCE QUANTUM GROUP OF Q-DEFORMED BOSON ALGEBRA WITH CONTINUOUS PARAMETERS

We present a q-deformed boson algebra using continuous momentum parameters and investigate its inhomogeneous invariance quantum group