Influence of photo-activation source on enamel demineralization around restorative materials

Abstract

This study evaluated the effects of the photoactivation source and restorative material on the development of caries-like lesions on human enamel after an in vitro pH challenge. Enamel cavities were prepared in 36 blocks, which were assigned to two groups according to the restorative material: resin-modified glass ionomer (RMGI) and composite resin (CR). Samples were exposed to quartz-tungsten-halogen lamp, argon-ion laser, or light-emitting diode (n = 6). The Knoop microhardness (KHN) values of the top surface of all materials were evaluated. Restored enamel blocks were thermocycled and subjected to 10 demineralization-remineralization cycles at 37°C. KHN analysis of the superficial enamel was performed by four indentations located 100 μm from the restoration margin. The material KHN was not affected by the photoactivation source. No significant difference in KHN was noted between CR and RMGI. The enamel surface around RMGI exhibited a higher KHN (272.8 KHN) than the enamel around CR (93.3 KHN), regardless of the photoactivation source. Enamel demineralization around the dental restoration was not influenced by the photoactivation source. Less enamel demineralization was observed around the RMGI than around the CR restoration.

In Vitro Evaluation of Remineralization Potential of Five Toothpastes on Soft Drink-Eroded Human Enamel and Dentine

“…The current study is a human observational study and it has conformed to the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines. Soft tissue debris on teeth was cleaned and inspected under a polarized light microscope (magnification x25) for cracks and white spot lesions, followed by disinfection in 5.25% sodium hypochlorite solution for one hour and then kept in 0.1% thymol solution at 4°C until the time of use [8,13].…”

“…The treatment of the basic principle of tooth erosion is to reduce acid consumption and improvement of remineralization [ 7 ]. In the last decade, new materials have been developed that may have value for the remineralization of enamel and dentine affected by dental erosion [ 8 ]. Various fluoridated toothpaste formulations have been long tested and proved to be successful in reducing the incidence of demineralization by increasing the fluoride content in saliva [ 9 ].…”