Curing process modification of a ‘self-cured’ injection molding material: Effect on water sorption and solubility
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Abstract
Objectives: to determine water sorption and solubility of ‘self-cured’ IvoBase® Hybrid material in 2 curing
techniques and immersion times in water, and to compare them to ‘heat-cured’ SR Ivocap® High Impact material.
Materials and Methods: disc shaped (50 mm diameter and 0.5 mm thickness) of SR Ivocap® High Impact was cured in water at 100°C for 35 minutes, then at 25°C for 30 minutes (Ivocap wet curing). IvoBase®
system was either processed via the IvoBase injection machine programme at 120°C (IvoBase dry curing) or cured by the same method as SR Ivocap® (IvoBase wet curing). The specimens were kept in the desiccator containing freshly dried silica gel, weighed daily until their mass (m1) was constant to 0.2 mg and, the volume (V) were recorded. The conditioned specimens were immersed in distilled water for 7 days and 30 days. The specimen weight (m2) were recorded after removal from the water. The specimens were reconditioned to constant mass (m3) in the desiccator. Then water sorption (wsp) and water solubility (wsl) at 7 days and 30 days were calculated. Two-way ANOVA was used to analyze the data.
Results: water sorption of Ivocap wet curing, IvoBase dry curing and IvoBase wet curing were 20.8±0.5,
22.4±0.9 and 23.2±0.3 µg/mm3 respectively for 7 days immersion and 21.8±0.9, 22.6±1.1 and 23.9±0.1 µg/mm3 respectively for 30 days immersion. The water solubility were 0.83±0.01, 0.33±0.04 and 0.69±0.03 µg/mm3 respectively for 7 days immersion and 0.89±0.05, 0.62±0.08 and 0.65±0.02 µg/mm3 respectively for 30 days immersion. Water sorption of IvoBase material was significantly higher than that of Ivocap at 7 days and 30 days (p<0.05). On the contrary, water solubility of Ivocap material was significantly higher than that of IvoBase (p<0.05). While the 2 methods of curing IvoBase did not affect the material water sorption but water solubility at 7 days water storage of IvoBase cured at 100o C was significantly higher than the material cured via the automated instrument. All the specimens passed the ISO 20795-1 requirement for water sorption not exceeding 32 µg/mm3 and water solubility not exceeding 1.6 µg/mm3.
Conclusion: Water sorption of IvoBase material was significantly higher than that of Ivocap but water solubility of Ivocap material was significantly higher than that of IvoBase. The methods of curing IvoBase did not affect the material water sorption but these had an influence on water solubility significantly.
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References
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