Periodontally Accelerated Osteogenic Orthodontics (PAOO) technique in cleft patients: A complement to orthognathic surgery in dentoalveolar expansion. A case series report.

The aim of this study was to describe a surgical technique that can be used to solve dentofacial deformities in cleft palate patients with maxillary hypoplasia in order to increase maxillary alveolar bone width, without modifying the skeletal base, and therefore, keeping the velopharyngeal function unaltered. Four patients with a history of cleft palate not associated with syndrome and treated under conventional surgical protocol during their childhood, underwent PAOO surgery incorporating L-PRF, followed by an accelerated orthodontic treatment with checkups every two weeks. All patients reached the desired occlusion without modifying their skeletal bases and velopharyngeal function. Orthodontic treatments were finished between 10 and 14 months after surgery without complications. There were no observed complications in the velopharyngeal postsurgical function and an increase in the arch width was achieved in all cases, along with a reduced orthodontic treatment time. The clinical results obtained confirm that PAOO technique is a safe and reliable complement to orthognathic surgery in the surgical treatment of cleft patients. By increasing the perimeter of the maxillary dentoalveolar ridge, the segmentation of the maxilla could be avoided, increasing the post operatory stability of these patients.

Bose-Einstein Condensate Comagnetometer.

We describe a comagnetometer employing the f=1 and f=2 ground state hyperfine manifolds of a ^{87}Rb spinor Bose-Einstein condensate as colocated magnetometers. The hyperfine manifolds feature nearly opposite gyromagnetic ratios and thus the sum of their precession angles is only weakly coupled to external magnetic fields, while being highly sensitive to any effect that rotates both manifolds in the same way. The f=1 and f=2 transverse magnetizations and azimuth angles are independently measured by nondestructive Faraday rotation probing, and we demonstrate a 44.0(8) dB common-mode rejection in good agreement with theory. We show how the magnetometer coherence time can be extended to ∼1 s, by using spin-dependent interactions to inhibit hyperfine relaxing collisions between f=2 atoms. The technique could be used in high sensitivity searches for new physics on submillimeter length scales, precision studies of ultracold collision physics, and angle-resolved studies of quantum spin dynamics.

Flux enhancement of photons entangled in orbital angular momentum.

Entangled photons are generally collected by detection systems that select their certain spatial modes, for example using single-mode optical fibers. We derive simple and easy-to-use expressions that allow us to maximize the coupling efficiency of entangled photons with specific orbital angular momentum (OAM) correlations generated by means of spontaneous parametric downconversion. Two different configurations are considered: one in which the beams with OAM are generated by conversion from beams without OAM, and the second when beams with OAM are generated directly from the nonlinear medium. Also, an example of how to generate a maximally entangled qutrit is presented.

Niveles salivales de Estreptococo mutans en el uso de un composite fluorado y un vidrio ionómero, en pacientes con aparatos de ortodoncia fijos / The effect of a fluoridated composite and a glass ionomer cement on salivary mutans Streptoccocal levels in orthodontic patients

Se realizó una investigación con el fin de evaluar la variación en los niveles salivales de Estreptococo mutans en pacientes que debían colocarse aparatos de orthodoncia fijos, y la posible relación entre estos niveles y el material utilizado para la cementación de dichos aparatos. Para ello se utilizó una muestra de dieciséis pacientes. A seis de ellos se les cementó los brackets con un cemento de vidrio ionómero híbrido de fotocurado. A cinco pacientes se les cementó los brackets con una resina compuesta fluorada. Como grupo control, se utilizó una muestra de cinco pacientes a los cuales se les cementó los brackets con una resina compuesta convencional. En todos los pacientes se utilizó un cemento de vidrio ionómero convencional para el cementado de las bandas ubicadas en los cuatro primeros molares. A todos los pacientes se les efectuó un test Carescreen antes y 3 meses después de la colocación de los aparatos. Se obtuvo como resultado un incremento en los niveles salivales de Estreptococo mutans en los tres grupos. Se utilizó el test del Signo de Wilcoxon para analizar la variación obtenida en cada grupo por separado. Tanto para el grupo control como para el grupo que utilizó un composite fluorado, el incremento observado alcanzó un valor cercano a la significación estadística (p=0.063, no significativo, para cada grupo), en tanto que la variación observada para el grupo que utilizó un cemento de vidrio ionómero, el valor obtenido fue de p=0.625, no significativo. El test Kruskal-Wallis no mostró diferencias significativas entre los grupos analizados (p=0.142)