IADR Abstract Archives
Experimental Bioactive Liner Contributions to Microhardness
Objectives: The focus of this study is to assess the microhardness of an experimental bioactive liner known as Cention-N (Ivoclar Vivadent®) via its cross-contributions of monomer and filler technology towards fluoride, calcium and hydroxide ion release.
Methods: Twenty standard class II cavity preparations, measuring 4mm occluso-cervically, 4mm mesiodistally, and 1.5-2.0 mm bucco-lingually were prepared on de-identified extracted human posterior teeth. One sample in group 4 had to be discounted from analysis due to faulty readings. Samples were then restored and randomly assigned with one of the following materials, see Table 1. Each material was applied, and light cured (DEMI™, Kerr) according to manufacturers’ instructions. Following restoration, all samples were placed in distilled water at 37°C for an additional 24-hours to ensure complete polymerization. Vicker’s surface microhardness was measured before restorations at standardized distances above the cementoenamel junction of each sample using MicroMet® 2104 (Buehler). The samples were then placed in 2mL of 0.05M acetate buffer demineralizing solution for 96-hours. After 96-hour demineralization period, samples were then cut longitudinally to display a hemi-section of the restorations. Six total Vicker’s surface microhardness measurements were taken, three of which were on enamel and the other three on dentin. Each of the six microhardness measurements were 50mm away from the restoration margin and 25mm away from the previous reading.
Results: Table 1 displays the enamel microhardness mean±SD difference of each group. There was no statistically significant difference in the change of the average enamel HV between groups (p=0.0986). Table 2 displays the dentin microhardness mean±SD of each group. There was a statistically significant difference between the average dentin HV of group 2 and group 4 (p=0.0115).
Conclusions: None of the materials exhibited a contribution towards enamel microhardness post restoration. However, group 4 demonstrated a higher average of dentin microhardness when compared to group 1 (control) post restoration.
Methods: Twenty standard class II cavity preparations, measuring 4mm occluso-cervically, 4mm mesiodistally, and 1.5-2.0 mm bucco-lingually were prepared on de-identified extracted human posterior teeth. One sample in group 4 had to be discounted from analysis due to faulty readings. Samples were then restored and randomly assigned with one of the following materials, see Table 1. Each material was applied, and light cured (DEMI™, Kerr) according to manufacturers’ instructions. Following restoration, all samples were placed in distilled water at 37°C for an additional 24-hours to ensure complete polymerization. Vicker’s surface microhardness was measured before restorations at standardized distances above the cementoenamel junction of each sample using MicroMet® 2104 (Buehler). The samples were then placed in 2mL of 0.05M acetate buffer demineralizing solution for 96-hours. After 96-hour demineralization period, samples were then cut longitudinally to display a hemi-section of the restorations. Six total Vicker’s surface microhardness measurements were taken, three of which were on enamel and the other three on dentin. Each of the six microhardness measurements were 50mm away from the restoration margin and 25mm away from the previous reading.
Results: Table 1 displays the enamel microhardness mean±SD difference of each group. There was no statistically significant difference in the change of the average enamel HV between groups (p=0.0986). Table 2 displays the dentin microhardness mean±SD of each group. There was a statistically significant difference between the average dentin HV of group 2 and group 4 (p=0.0115).
Conclusions: None of the materials exhibited a contribution towards enamel microhardness post restoration. However, group 4 demonstrated a higher average of dentin microhardness when compared to group 1 (control) post restoration.
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