In-vivo effects of flapless osteopuncture-facilitated tooth movement in the maxilla and the mandible

This study aimed to investigate the effects of a minimally invasive, flapless procedure to enhance tooth movement in both jaws and to determine whether this triggers the acceleration when repeated monthly. The sample consisted of thirty-two individuals whose orthodontic treatment required canine retraction. They were divided into an experimental group and control group. Osteopunctures were performed using orthodontic mini-screws at the distal aspects of the canine teeth at the beginning and on the fourth week of distalization in the experimental group. The control group was treated with conventional mechanics. All canines were retracted. The rates of canine distalization, rotation, and tipping were measured on the first, fourth, and eighth weeks of distalization. First molar anchorage loss was also measured. Intergroup and intragroup analyses were performed. Flapless osteopuncture-facilitated tooth movement resulted in greater canine distalization and reduced molar movement in the maxilla in the experimental than in the control group during the first month of distalization. In addition, the extent of upper canine movement was significantly higher in the experimental group in the first month than in the second. No differences in canine and molar movement in the mandible were observed between the two groups. OP, as applied in this study, is an effective method for increasing the rate of tooth movement in the maxilla. Repeating the procedure monthly does not appear to show a major advance of tooth movement

Investigation of the collective behaviour of nuclei around mass 70 towards the proton drip-line

In even-even nuclei, deformation of the nucleus is related to reduced transition probability, B(E2) values. By measuring the 2 + states and corresponding B(E2) values, collectivity can be studied in a unique way. In order to obtain these values, intermediate energy exotic beams have been used as a spectroscopic tool through Coulomb excitations and nuclear inelastic scatterings. The inelastic scattering of 72 Kr, 70 Kr, 70 Br and 68 Se isotopes on 9 Be and 197 Au targets has been performed. Production of these very exotic nuclei, at the proton drip-line, was achieved at the Radioactive Isotope Beam Factory (RIBF), Japan [1]. A 78 Kr primary beam with an energy of 345 MeV/u was impinged on a 9 Be target to produce the ions of interest as a secondary beam. The BigRIPS fragment separator was used in order to deliver the secondary beam isotopes with an energy of 175 MeV/u to the secondary target. The reaction products were identified in the ZeroDegree Spectrometer (ZDS) employing the Bρ-∆E-ToF method. The γ-rays emitted due to the excitation were measured by an array of γ-ray detectors, DALI2, that was placed around the secondary target [2]. The experiments were performed using two different targets in order to increase the probability of Coulomb or nuclear interaction. While the exotic beam at intermediate energies scatters through the electromagnetic field of an Au target, Coulomb and nuclear forces interfere. The fraction of these two kinds of excitation was identified by scattering the same beam off a Be target and increase the relative strength of nuclear scattering. For each isotope, the experimental conditions were simulated to obtain the response functions of the transitions. Experimental results were then fitted to these response functions from the simulations in order to determine the number of emitted γ-rays. Then, the excitation cross-sections were deduced for both cases and used in order to determine the deformation lengths δ n and δ cfor nuclear and Coulomb excitation, respectively. These deformation lengths were obtained using ECIS-97 code [3]. Finally, using the relation between electromagnetic interaction deformation length and the deformation parameter, B(E2) values were determined

The better choice for measuring the gonial angle of different skeletal malocclusion types: Orthopantomograms or lateral cephalograms?

The aim of this study was to highlight the current dilemma of gonial angle measurement on orthopantomograms and lateral cephalograms of adults with different skeletal malocclusion types. The sample consisted of 50 Class I, 50 Class II and 50 Class III (25 males and 25 females for each group) orthopantomograms and cephalograms obtained from previously treated orthodontic patients. For each malocclusion group, the angle between Tweeds mandibular plane and the tangent from the line running along the gonion to the distal point of the condyle was measured on the right and left sides on orthopantomograms and the superimposed images of the mandible on cephalograms. Paired t-test demonstrated no significant difference between the values of gonial angles determined by cephalograms and orthopantomograms in Cl I patients. Pearson correlation also showed a high correlation between gonial angle values measured on the two diagnostic tools in Cl I patients. In Cl II and Cl III patients, statistical analysis showed a significant difference between the gonial angles defined by cephalograms and orthopantomograms. Orthopantomograms can be used for determining gonial angle as accurately as cephalograms in Cl I patients. Hovewer, orthopantomograms are not appropriate tools for measuring the gonial angle in Cl II and Cl III patients. [Med-Science 2019; 8(1.000): 93-6