Properties of glass ionomer cements after addition of organic dye solutions

doi:10.3969/j.issn.2095-4344.0913

Abstract

Abstract:

BACKGROUND: A wall build-up prior to endodontic therapy is applied to prevent contamination of the root canals from oral cavity and to provide retention for rubber dam when root canal treatment is required to badly broken-down tooth which have lost the integrity of the external coronal tooth structure in clinical practice. However, the color of the available wall build-up materials is consistent with the tooth tissue, which often causes the loss of tooth tissues during the removal in later prosthetic phase. Therefore, it is advisable to endue materials with a distinct color that makes it chromatically different from the tooth tissue, which is of great clinical significance.

OBJECTIVE: To compare the effect of three organic dye solutions on physicochemical and mechanical properties of reinforced glass ionomer cements (GIC) which used as wall build-up material.

METHODS: Different concentrations of methylene blue, crystal violet, erythrosine dye solutions (1%, 2%) were dispersed to the liquor of glass ionomer cements respectively as experiment groups, whereas the undyed glass ionomer cements were taken as control group. The setting time was measured in each group according to the occupation standard. The macro/micro surface topographical features of all the glass ionomer cement specimens were investigated. Meanwhile, water sorption and solubility were assessed. The compressive strength of the specimens was determined using a universal testing machine (Instron). The specimens were then attached to the dentin and the vertical section of the bonding interface between the glass ionomer cement and the dentin was observed using endodontic microscope. Shear bond strength and failure mode of the specimens were also determined.

RESULTS AND CONCLUSION: (1) There was no significant difference in the setting time among groups. The appearance of the specimens in the experiment groups was chromatically different from those in the control group, whereas the microscopic surface morphology of the specimens were insignificantly different. (2) In comparison to the control group, incorporation of organic dye solutions to the glass ionomer cements increased the solubility (P < 0.05), but the water absorption showed no significant difference in all groups. (3) The compressive strength of the specimens that had been immersed in the artificial saliva for 1 and 7 days in all groups showed no significant difference. (4) The dyed specimens in the experiment groups were tightly bonded to the dentin and the boding interface was continuous with no obvious fractures, cracks and bubbles. Penetration into dentinal tubules of organic dye solutions was not observed. (5) The shear bond strength of the specimens that had been immersed in the artificial saliva for 7 days in all groups showed no significant difference. The failure modes of the specimens mainly included cohesive failure and mixed failure. Our findings reveal that the glass ionomer cements can be obviously stained by methylene blue, crystal violet and erythrosine at a concentration of 1% or 2%, whereas physicochemical and mechanical properties of the glass ionomer cements are less altered, indicating the dyed glass ionomer cements can be used during root canal therapy as a wall build-up material．

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Root Canal Therapy, Gentian Violet, Tissue Engineering

CLC Number:

R318

Wang Ping-ting, Bao Yi-jun, Liu Ying . Properties of glass ionomer cements after addition of organic dye solutions[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(26): 4116-4122.

Figures/Tables 8

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