Influence of pH on the release of nickel ions from fixed orthodontic appliances in artificial saliva.

Aim: The aim of this study was to make a laboratory assessment of pH influence on the kinetics of the release of nickel ions in artificial saliva.

Methods And Material: In this study, 15 basic orthodontic appliances are immersed in 15 polyethylene tubes each containing 40 ml of artificial saliva. Tubes were divided into three sub-groups of 5 tubes depending on the pH: pH 5, pH 7 and pH 8.

Diet and rate of decomposition of the corpse in a human surrogate.

The decomposition of an inert body seems to depend on the physiological, biological and physical characteristics of the corpse. The effect of these, especially of extra-biological mechanisms, on the rate of decomposition of the corpse does not seem to be sufficiently explored. The present work proposes to examine the influence of the type of feeding on the rate of cadaver decomposition in a human surrogate.

Application of the Kvaal method with cone beam for the determination of a local formula for the age estimation of adult African melanoderma subject, Côte d'Ivoire.

Background: Age estimation by invasive dental methods is a destructive, costly and time-consuming approach, whereas, age estimation methods using dental radiographs are simple, non-destructive and provide reliable information. Age estimation by the Kvaal radiographic method has proven to be a reliable method, but possible ethnic variations may limit its uses in other populations. The objective of this study was to reproduce the original Kvaal method with CBCT for the estimation of the age of the adult melano-African subject in Côte d'Ivoire, in order to propose an age estimation formula, specific to our study population, by taking into account the measurements of tooth and pulp ratios.

[Evaluation of motivational factors of adolescent patients for orthodontic treatment using the Q methodology].

The management of adolescents in the orthodontic practice remains a challenge in terms of motivation and adherence to treatment. Some factors seem to be of paramount importance in the success of treatment. The objective of the present study was to evaluate the motivational factors of adolescent patients seeking orthodontic treatment using the Q methodology.

Cytotoxicity evaluation of dental and orthodontic light-cured composite resins.

Introduction: The aim of this study was to determine the cytotoxicity of light-cured composite resins (Clearfil ES-2, Clearfil ES Flow, Filtek Supreme XTE, Grengloo, Blugloo, Transbond XT, and Transbond LR) then to assess leachable components in contact with human gingival fibroblasts (GFs) and to quantity detected bisphenol A (BPA).

Methods: Light-cured composite resin discs were immersed for 24 hours in gingival fibroblastic medium (n = 3 for each product) and in control medium (n = 2 for each product) contained in plate. Cytotoxicity of the products (n = 95) was determined by the measure of cell viability using MTT assay after reading the optical densities of the plates.