IADR Abstract Archives
Interaction of Conventional and Giomer-Bioactive Polymeric Pit-and-fissure Sealants With Hydroxyapatite
Objectives: Pit-and-fissure sealing is one of the main professional procedures to prevent or arrest incipient carious lesions, establishing a mechanical barrier. Polymeric sealants are mostly used to determine this protection. When bioactive agents are introduced it may determine a resourceful approach to control the des-re process or even recover the mineral loss. Since the durability of such materials is also related to the quality of their polymerization, the aim of this study was to analyze if the interaction of bioactive ingredients with hydroxyapatite would interfere on the degree of conversion (DC) of two resinous pit-and-fissure sealants.
Methods: The experimental design involved two factors: sealant in 2 levels (Fluroshield® [FS] x BeautiSealant® [BS]) and treatment in 2 levels (Control [C] x 1 wt% hydroxyapatite incorporation [HA]). BS is a giomer-based technology, a multi-ionic system. DC was evaluated by Fourier Transform Infrared Spectroscopy (FTIR) attached to an ATR crystal, on which 3µL of each material (n=5) was deposited. Uncured and cured absorption spectra were obtained, and DC was determined by measuring the ratio of C=C aliphatic absorption (≈1038cm-1) and C=C aromatic absorption peaks (≈1608cm-1). The polymerization was performed with Radii Cal/SDI, LED-curing unit (irradiance of 1,000 mW/cm2) according to the manufacturers’ instructions. Data was submitted to two-way ANOVA and Tukey tests (p<0.05).
Results: The results showed statistical difference only for sealant factor (p=0.000023). BS presented the highest DC (86.67±6.54), while FS presented the lowest DC (53.26±6.09). The incorporation of HA did not affect their DC (BS+HA= 87.55±4.95; FS+HA= 59.68±6.56). Spectroscopy profile also attested this performance.
Conclusions: The incorporation of HA is not able to interfere on the DC of conventional and bioactive pit-and-fissure sealants. Therefore, as the presence of multi ions did not affect the material DC when in contact with HA, it could conciliate mechanical and chemical benefits in the prevention of pit-and-fissure areas.
Methods: The experimental design involved two factors: sealant in 2 levels (Fluroshield® [FS] x BeautiSealant® [BS]) and treatment in 2 levels (Control [C] x 1 wt% hydroxyapatite incorporation [HA]). BS is a giomer-based technology, a multi-ionic system. DC was evaluated by Fourier Transform Infrared Spectroscopy (FTIR) attached to an ATR crystal, on which 3µL of each material (n=5) was deposited. Uncured and cured absorption spectra were obtained, and DC was determined by measuring the ratio of C=C aliphatic absorption (≈1038cm-1) and C=C aromatic absorption peaks (≈1608cm-1). The polymerization was performed with Radii Cal/SDI, LED-curing unit (irradiance of 1,000 mW/cm2) according to the manufacturers’ instructions. Data was submitted to two-way ANOVA and Tukey tests (p<0.05).
Results: The results showed statistical difference only for sealant factor (p=0.000023). BS presented the highest DC (86.67±6.54), while FS presented the lowest DC (53.26±6.09). The incorporation of HA did not affect their DC (BS+HA= 87.55±4.95; FS+HA= 59.68±6.56). Spectroscopy profile also attested this performance.
Conclusions: The incorporation of HA is not able to interfere on the DC of conventional and bioactive pit-and-fissure sealants. Therefore, as the presence of multi ions did not affect the material DC when in contact with HA, it could conciliate mechanical and chemical benefits in the prevention of pit-and-fissure areas.