Estudio descriptivo in vitro de dos agentes blanqueadores de distinta concentración sobre la micromorfología del esmalte bovino

Dental tooth bleaching is a conservative option for the treatment of tooth stains. It is based on the use of hydrogen peroxide as an active agent. Despite its effectiveness to lighten tooth colour, there is concern regarding its use due to the effects it could have over enamel surface. There is scarce evidence on the subject and contradictions exist between different authors. The aim of this study was to compare enamel surface micromorphology after bleaching teeth with different concentrations of hydrogen peroxide solutions. Method: 50 healthy bovine incisors sectioned horizontally at the cemento-enamel junction were prepared. Contents of pulp chamber and tooth surfaces were cleaned. The buccal surface of each tooth was divided vertically, assigning one half to the control group (CG) and the other randomly to: Group 1: 25 samples treated with 15% hydrogen peroxide with nitrogen doped titanium dioxide. Group 2: 25 samples treated with 35% hydrogen peroxide. Square samples (2x2 mm.) were obtained and observed by SEM (magnification of 5.000x and 10.000x). Results: All treated groups showed longitudinal depressions on the surface and increased surface roughness. Conclusions: Tooth bleaching with hydrogen peroxide produces subclinical alterations over bovine enamel surface. 15% hydrogen peroxide bleaching agent produced less micromorphology alteration over bovine enamel surface than the 35% hydrogen peroxide agent.

Percepción de un grupo de mujeres acerca del hecho de ser portadoras del VPH

Background: The possibility to acquire sexually transmitted diseases generates bio-psycho-social conflicts affecting daily life of women. Objective: To investigate the knowledge of women on the concept of being infected by the human papilloma virus (HPV) and to understand the significance they attributed to their condition as HPV carriers. Material and method: It is a qualitative study in which ten women were interviewed, after the result of a cytopathological exam suggesting HPV. Data were collected at the Center of Health School of the Universidade Estadual Paulista -UNESP-Brazil. Results: The significant items were: deception and preoccupation about the cure, since they indicate that it is very deceptive to be infected with an incurable disease by a person whom they trust; the method of having sexual relations and being infected again; the necessity of care and of being optimistic to face the disease and the threat of cervix cancer originating anxiety. Discussion: Orientations made by health professionals were efficacious to clarify the relationship with cancer development. It is possible to understand the necessity of assistance orientations and the opportunity to hear them, offering individualized quality care. This study also offers important elements to reinforce the educational role of health professionals, principally those referring to sexually transmitted infection and cancer, seeking prevention and early treatment with the offered information. However, there is no desire of finishing the subject regarding perception, thus there is much to discover about diseases related to human papilloma virus. Key words: women carriers of HPV, feelings attributed by women.