Effect of resin infiltration and bleaching on surface roughness and microhardness of human enamel with induced white spot lesions / Efeito do infiltrante resinoso e do clareamento na rugosidade e microdureza de superfície do esmalte humano com lesões de mancha branca induzidas

Objective: To comparatively evaluate the effect of resin infiltration, bleaching and bleaching followed by resin infiltration on the surface roughness and microhardness of human enamel with induced white spot lesions (WSLs) and their resistance to acidic challenge. Material and Methods: Sixty human specimens were randomly divided into three groups (n=20) according to the treatment modality applied; group I Icon® resin infiltration, group II bleaching and group III bleaching followed by Icon® resin infiltration. For each treatment modality, 10 specimens were tested for surface roughness and another 10 for microhardness. WSLs were artificially induced in all specimens and after treatment, all specimens were subjected to acidic challenge. Surface roughness was measured by the tapping mode of the atomic force microscope (AFM) and microhardness was measured by digital Vickers hardness tester at baseline, after induction of WSLs, after treatment and after acidic challenge. Results: Groups I and III showed significant reduction in surface roughness after treatment, while group II showed significant increase. Groups I and III showed significant increase in the microhardness after treatment, while group II showed insignificant increase. The three tested groups showed significant increase in surface roughness values and significant reduction in microhardness after acidic challenge. Conclusion: Resin infiltration and bleaching followed by resin infiltration reduced the surface roughness and enhanced the microhardness of the WSLs. The three treatment modalities failed to resist acidic challenge resulting in increasing surface roughness and reducing microhardness. (AU)

Objetivo: Avaliar comparativamente o efeito do infiltrante resinoso, clareamento e clareamento seguido de infiltração resinosa sobre a rugosidade e microdureza superficial do esmalte humano com lesões de manchas brancas induzidas (WSLs) e sua resistência ao desafio erosivo. Material e Métodos: Sessenta espécimes humanos foram divididos aleatoriamente em três grupos (n = 20) de acordo com a modalidade de tratamento aplicada; grupo I infiltrante resinoso Icon®, grupo II clareamento e grupo III clareamento seguido de infiltração resinosa Icon®. Para cada modalidade de tratamento, 10 corpos-de-prova foram testados para rugosidade superficial e outros 10 para microdureza. WSLs foram artificialmente induzidos em todas as amostras e, após o tratamento, todas as amostras foram submetidas ao desafio erosivo. A rugosidade de superfície foi medida por microscopia de força atômica em modo de contato intermitente (AFM) e a microdureza Vickers foi medida inicialmente, após a indução de WSLs, após o tratamento e após o desafio ácido. Resultados: Os grupos I e III apresentaram redução significativa da rugosidade superficial após o tratamento, enquanto o grupo II apresentou aumento significativo. Os grupos I e III apresentaram aumento significativo na microdureza após o tratamento, enquanto o grupo II apresentou aumento insignificante. Os três grupos testados mostraram aumento significativo nos valores de rugosidade superficial e redução significativa na microdureza após o desafio erosivo. Conclusão: O infiltrante resinoso e o clareamento seguido de infiltração resinosa reduziram a rugosidade de superfície e aumentaram a microdureza dos WSLs. As três modalidades de tratamento falharam em resistir ao desafio erosivo, resultando em aumento da rugosidade de superfície e redução da microdureza.(AU)

use of levonorgestrel-releasing system [metraplant-E] in the treatment of abnormal uterine bleeding

Background: Dysfunctional uterine bleeding [DUB] is one of the commonest condition for which patient seeks out medical consultation. The prevalence increases with the increase of age peaking before menopause

Objective: The aim of this work is to evaluate the effect of this new form of levonorgestrel-releasing IUD on the treatment of patients with abnormal uterine bleeding

Subjects and methods: A prospective age-specific comparative analysis of 61 peri-menopausal women presented with dysfunctional uterine bleeding who constituted the study group. They underwent hysteroscopy and endometrial sampling during an 18 months period from June 2014 to January 2016 at Ain Shams University Materity Hospital. Prior to metraplant-E application, all the patients in this study were in the age of 25-58 years old

Results: The role of Metraplant-E in the treatment of abnormal uterine bleeding [AUB] was evaluated. Sixty-one women with failed attempt[s] of medical treatment unwilling or unfit for hysterectomy were treated with Metaplant-E. Menstrual blood loss was assessed by pictoral bleeding assessment chart [PBAC], bleeding index [B.I] and total bleeding score [T.B.S/month]. The bleeding patterns in the form of the mean menstrual blood loss estimated by bleeding index and the mean menstrual loss estimated by the total bleeding score/month and PBAC decreased significantly [p = 0.001]. The quality of life scale [Likert scale] improved significantly [p = 0.001]. All 15 cases who had endometrial sampling demonstrated progestational effect on histo-pathological examination

Conclusion: Metraplant-E was found to be effective in managing dysfunctional menorrhagia on both clinical and histopathological levels