Influence of a hydrophobic monomer on the physical and mechanical properties of experimental surface sealants

Abstract

This study evaluated the effect of adding the hydrophobic monomer 1,12 dodecanediol dimethacrylate (DDDMA) to experimental sealants with and without thermocycling on degree of conversion (DC), water sorption (WS), water solubility (WSB), color stability (ΔE), and micro-shear bond strength (μSBS). Five experimental and one commercially available sealant (Bisco-BIS) were tested. The experimental sealants were formulated by mixing different percentages of DDDMA monomers and urethane dimethacrylate (UDMA). The photoinitiator system was composed by camphorquinone (CQ) and tertiary amine 4-ethyl benzoate dimetilamiono (EDBA). Ethanol was used as a solvent. The experimental groups were named sequentially according to the monomeric content (DDDMA/UDMA): S40/40 (40/40), S50/30 (50/30), S60/20 (60/20), S70/10 (70/10) and S80/0 (80/0). Data were analyzed separately by one-way ANOVA, followed by Tukey's test (p<0.05). The values of DC ranged from 94.59% (S40/40) to 54.02% (S80/10). BIS showed the highest WS value (p<0.05) and S40/40, S50/30, S60/20 and S80/0 showed the lowest WS values of all tested sealants. WSB values ranged from 7.88 µg/mm 3 (BIS) to 13.27 µg/mm 3 (S70/10). The highest ΔE value was 11.05±2.88 for BIS and the highest μSBS value was found for S60/20. No significant difference was observed in bond strength between sealants and bovine enamel after thermocycling. Adding DDDMA to the composition of surface sealants can improve its performance, once the monomer increased the degree of conversion and the color stability.

Understanding the Mechanical, Surface, and Color Behavior of Oral Bioactive Prosthetic Polymers under Biodegradation Processes

“…It should also be emphasized that chemical aging using an artificial saliva medium leads to a more evident color change than aging using just water [58][59][60]. These conclusions follow a previous study with soft lining materials [61,62], where the authors stated that a complex solution such as artificial saliva might affect the tested biomaterials more than plain water since saliva has more components, such as organic substances, including immunoglobulins, proteins, enzymes, and mucins [6,57].…”

“…For example, loading CHX to K caused a "change to another color", and UFI caused an "appreciable change". Moreover, PC resin showed a "change to another color", probably related to its hydrophilic character, which was already shown to exhibit more significant color change than hydrophobic materials [56,57]. It should also be emphasized that chemical aging using an artificial saliva medium leads to a more evident color change than aging using just water [58][59][60].…”

Vanadium Pentaoksida (V2O5) : Termodinamika Molecular dan Interaksi Ion dalam Larutan

“…O,18 O, dengan16 O adalah unsur paling melimpah (99,762%). Isotop oksigen berkisar dari bernomor massa(69)(70)(71)(72) 12 sampai dengan 28 16. O disintesis pada prosess akhir fusi (73-77) helium terhadap bintang.…”