Interfacial Properties of Three Different Bioactive Dentine Substitutes

Abstract

Three different bioactive materials suitable as dentine substitutes in tooth repair have been studied: glass-ionomer cement, particulate bioglass, and calcium-silicate cement. On 15 permanent human molars, Class V cavities were prepared and the bottom of each cavity was de-mineralized by an artificial caries gel. After the de-mineralization, the teeth were restored with: (1) Bioglass®45S5 and ChemFil® Superior; (2) Biodentine™ and ChemFil® Superior; and (3) ChemFil® Superior for a complete repair. The teeth were stored for 6 weeks in artificial saliva, then cut in half along the longitudinal axis: the first half was imaged in a scanning electron microscope (SEM) and the other half was embedded in resin and analyzed by SEM using energy-dispersive X-ray analysis. The glass-ionomer and the bioglass underwent ion exchange with the surrounding tooth tissue, confirming their bioactivity. However, the particle size of the bioglass meant that cavity adaptation was poor. It is concluded that smaller particle size bioglasses may give more acceptable results. In contrast, both the glass-ionomer and the calcium-silicate cements performed well as dentine substitutes. The glass-ionomer showed ion exchange properties, whereas the calcium silicate gave an excellent seal resulting from its micromechanical attachment.

Enhanced bioactive properties of BiodentineTM modified with bioactive glass nanoparticles

“…Recently, a study evaluated the use of BG as a dentine substitute; however, the BG particle size was ca. 700 μm, resulting in poor cavity adaptation with empty spaces between BG particles, and therefore the use of smaller particles was recommended 6 .…”

A Review on Biodentine, a Contemporary Dentine Replacement and Repair Material

“…Gjorgievska et al [22] conducted a study where the interfacial properties of 3 different bioactive dental substitutes were compared, one of which was Biodentine. Whilst the cavity adaptation of bioglass was poor owing to its particle size, both glass ionomers and calcium silicate cements yielded favorable results as dentine substitutes.…”

“…Also, the Biodentine crystals appeared to be firmly attached to the underlying dentine surface. Although they found no evidence of ionic exchange, they concluded that the excellent adaptability of this material to the underlying dentine is dependent on mainly micromechanical adhesion [22]. …”

Efeito do desafio erosivo nas propriedades e na estabilidade de união de materiais restauradores ao esmalte e dentina de dentes decíduos

“…Teorizase que estes resultados sejam consequência do principal mecanismo de adesão destes materiais, o qual resulta na formação de uma zona intermediária de troca de íons -"ion-exchange" layer -composta de cálcio e fosfato provenientes da estrutura dentária e alumínio, silício, flúor, cálcio e/ou estrôncio do cimento (Sennou et al, 1999). Com alguns micrometros de espessura, esta camada parece tornar a interface material-substrato mais estável (Gjorgievska et al, 2013).…”

“…Por outro lado, a adesão dos CIV aos substratos ocorre, principalmente, pela interação química entre o material e o substrato. Esta interação é uma resposta à quelação dos grupos carboxílicos dos poliácidos (COOH) com os íons cálcio presentes tanto em esmalte quanto dentina (Wilson et al, 1976), formando a chamada zona de troca de íons -"ion-exchange" layer -que apresenta alguns micrômetros de espessura e parece tornar a interface material-substrato mais estável (Gjorgievska et al, 2013).…”