Effects of a glass-ionomer cement on the remineralization of occlusal caries: an in situ study Efeito de um cimento de ionômero de vidro sobre a remineralização de cárie na superfície oclusal: estudo in situ

• Published in: Brazilian oral research 2006-04, Vol.20 (2), p.91-96
• Main Authors: Mônica Tostes Amaral, Antônio Carlos Guedes-Pinto, Orlando Chevitarese
• Format: Article
• Language: English
• Subjects: Cimentos de ionômeros de vidro; Dental enamel; Dureza; Esmalte dentário; Glass ionomer cements; Hardness
• ISSN: 1806-8324
• DOI: 10.1590/S1806-83242006000200001

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 (Delton - Dentsply). 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.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 nã