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Aim: To study of the interactions of two new ruthenium(II) complexes (C1 and C2) with calf thymus (CT)-DNA; production of RuO 2 nanoparticles using the complexes precursor., Materials & Methods: Complex C1 was characterized by x-ray crystallography. The binding of the complexes with (CT)-DNA was studied using techniques that include electronic absorption spectra, fluorescence and redox behavior. The preparation of RuO 2 nanoparticles was carried out by thermal decomposition., Results: The interaction mode of DNA with complexes is the type of electrostatic. It was revealed that sonication of the samples, before thermal decomposition, has been affected the morphologies and sizes of the resulting nanoparticles., Conclusion: The complexes are capable of interaction with DNA molecules and they have a good potential to prepare nanostructures.

Dilaceration is a comparatively uncommon dental deformity generally characterized by an angulation between crown and root, and consequently causing non-eruption of the tooth. Dilaceration generally occurs following trauma to the apices of deciduous dentition, which lies close to the permanent tooth buds. As a result, surgical extraction used to be the first choice when making the treatment plan for a case with severely dilacerated teeth. This case report presents the orthodontic alignment of a permanent maxillary right central incisor in an 8-year-old boy who had an impacted inverted maxillary central incisor, with distoangular root dilaceration through the crown. Following surgical exposure with the closed-eruption technique and appropriate orthodontic traction, the tooth was successfully aligned into the dental arch and the root was radiologically shown to be straightened and relatively well developed. The impacted dilacerated incisor diagnosed in the early mixed dentition should be treated with the aid of orthodontic traction.