The effect of bleaching gel(35% hydrogen peroxide) on the release of mineral ions from the enamel surface during successive time intervals(in vitro study)

Alterations of the enamel after topical application of bleaching agents, presenting as major consequences are: ions release, increased superficial roughness, stronger bacterial attachment and hardness alteration.The aims of the study were to evaluate the effect of the bleaching agent (35%hydrogen peroxide) for vital teeth by using light source on the release of ions from the enamel surface. our sample consisted of 30 sound enamel surface for control group,30 sound enamel surface for(35%hydrogen peroxide), and then application of light radiation to activate the bleaching agent. Ion Chromatography were used to measure the ions release .

Study the effectiveness of the application of the catalase enzyme in a dyeing bath

The search is focused on application of the catalase enzyme in the dyeing bath at different temperatures and concentration to catalyze the peroxide remaining after bleaching the fabrics of cotton and study its effect on exhaustion and fastness of reactive dye and compare these results with sample is dyed in clean water path without the presence of the enzyme.

Bleaching cellulose fabrics by using Hydrogen peroxide

This study aims to shed light upon bleaching process, study the influence of each substance during the process and the best time for bleaching in addition to clear up the effect of water.

The effect of home tooth bleaching on the bond between veneers composite resins and tooth enamel

The research project sample consisted of 80 extracted central incisors obtained from the Oral and Maxillofacial Surgery Department as well as from private practices. These teeth were divided into two equal groups. The bonding agent ClearFil SE Bond was used in one group, whereas the OptiBond Solo Plus bonding agent was used in the other group. Each group was divided into four subgroups: (1) veneers performed without any bleaching, (2) veneers performed two weeks before bleaching, (3) veneers performed immediately following bleaching and (4) veneers performed two weeks after bleaching. veneers were made using a special template which allowed producing the same size of all the specimens used in this project. These veneers were placed on the vestibular surfaces of enamel of the extracted central incisors. The aim of the previous procedures was to study the effect of home teeth bleaching . Teeth were embedded in acrylic blocks created in metallic cylinders. The bonding strength was measured through . The results showed that there was a significant difference between the control subgroup and the second subgroup .