Effects of a glass-ionomer cement on the remineralization of occlusal caries: an in situ study

Abstract

This work evaluated the remineralization of demineralized enamel of pits and fissures of human third molars sealed with a glass ionomer cement (Fuji IX, GC Corporation -Japan) or with a Bis-GMA sealant (DeltonDentsply). Ten volunteers participated in this in situ study that consisted of two thirty-day periods using intra-oral devices, with a week's interval in between. Four experimental treatment procedures and one control were randomly assigned to the volunteers' specimens: Group I, no treatment, control; Group II, artificial caries process; Group III, same treatment as Group II, but sealed with Delton (Dentsply); Group IV, same treatment as Group II, but sealed with Fuji IX (GC Corporation -Japan); Group V, same treatment as Group II and no sealing. Groups I and II were not submitted to the oral environment and served as controls. After a period of 30 days in the oral environment, the specimens were removed from the devices, embedded in acrylic resin, ground flat and polished. Then, Knoop hardness tests were performed, with a 25 g static load applied for 15 seconds. The measurements were made from the base of the fissure up to an opening of 600 µm, pre-established between the inclines of the cusps. Three indentations were then made, located at 25, 75, and 125 µm in depth from the outer enamel margin and 100 µm apart from each other (Micromet 2003). The Brieger F and Bonferroni's tests were applied to the measurements. It was concluded that sealing with the glass ionomer cement Fuji IX was capable of making the enamel of pits and fissures more resistant by increasing the value of Knoop hardness. DESCRIPTORS: Glass ionomer cements; Dental enamel; Hardness. RESUMO:Esta pesquisa avaliou a remineralização do esmalte de fóssulas e fissuras de terceiros molares humanos previamente desmineralizados e selados com um cimento de ionômero de vidro (Fuji IX, GC Corporation -Japão) ou com um selante de Bis-GMA (Delton-Dentsply). Dez voluntários participaram deste estudo in situ que consistiu de dois períodos de 30 dias com intervalo de 1 semana entre eles, usando dispositivos intra-orais. Quatro procedimentos de tratamento experimental e um controle foram aleatoriamente distribuídos entre os espécimes que foram usados pelos voluntários: Grupo I, sem qualquer tratamento, controle; Grupo II, processo de cárie artificial; Grupo III, igual ao Grupo II, porém selados com Delton (Dentsply); Grupo IV, igual ao Grupo II, porém selados com Fuji IX (GC Corporation -Japão); Grupo V, igual ao Grupo II, mas sem selamento. Os Grupos I e II não foram submetidos ao meio bucal e serviram de controle. Após um período de trinta dias no meio bucal, os espécimes foram removidos dos dispositivos, montados em resina acrílica, planificados e polidos. Realizaram-se então testes de Dureza Knoop com carga estática de 25 g por 15 segundos. As medidas foram realizadas desde a base da fissura até uma abertura de 600 µm, preestabelecida entre os planos inclinados das cúspides. A cada 100 µm, três penetrações foram realizadas: a primeira a 25 µm...

Clinical comparison of Fuji VII and a resin sealant in children at high and low risk of caries

“…The pattern of fluoride release from Fuji VII was consistent, with an initial high release followed by low prolonged leakage before a return to the baseline value after 1 year 11) . Release of fluoride over the long term could enhance the cariostatic ability of the surrounding enamel, and increase the acid resistance of the demineralized enamel in the fissures 33) . Second, children were treated with 6,000 ppm fluoridated foam at every clinic recall and used 600 ppm fluoridated toothpaste twice every day during the experimental period.…”

Glass Ionomer Cements’ Effect on the Change in the Chemical Composition of Tooth Crown Dentin

“…Современные требования к плом-бировочным материалам многочисленны и вклю-чают в себя, в частности, желательную адгезию к тканям зуба, способность к противокариозному действию и к реминерализации подлежащих тка-ней. История развития и исследования стеклоио-номерных цементов (СИЦ) содержит данные об их противокариозном и профилактическом эффекте [5,6,11].…”

“…Стронций в составе СИЦ повыша-ет уровень рентгеноконтрастности материала, его механическую твердость и, согласно последним исследованиям, обладают синергическим действи-ем с фтором с точки зрения его противокариозного действия. На границе зуба и пломбировочного ма-териала образуется ионообменная химическая связь за счет кальций-стронций-фосфатполиакри-ловой кристаллической структуры, которую сложно разрушить [6,7,10].…”

“…Именно СИЦ спо-собны обеспечивать плотное краевое прилегание к частично деминерализованному дентину и препят-ствовать развитию кариозного процесса, обеспе-чивая длительную адгезию к эмали и дентину без признаков раздражения пульпы, способствуя ре-минерализации подлежащего дентина за счет ми-грации элементов Ca, F и Sr из СИЦ в деминера-лизованный дентин [6].…”

Mineral content of ionomer cements and preventive effect of these cements against white spot lesions around restorations

“…1,2,3,4 Glassionomer cements (GICs) have been used for over 20 years in dentistry as important tools in caries prevention. 1,4,5,6 Certain GIC properties indicate that it is a "smart material"; these include ion exchange and recharge between conventional GICs and the external environment, a thermal expansion coefficient similar to teeth, and chemical adhesion to tooth enamel and dentin.…”