IADR Abstract Archives
SDF/SDF+KI and Rinsing Effects on RMGI Bond Strength to Dentin
Objectives: This study aimed to compare the microtensile bond strength (MTBS) of resin-modified glass ionomer (RMGI) to dentin treated with silver diammine fluoride (SDF) or SDF with potassium iodide (SDF+KI) with or without rinsing and polyacrylic acid (PAA) application.
Methods: Occlusal enamel of 60 extracted human posterior teeth was removed. Exposed sound dentin was polished with 800-grit silicon carbide paper in three groups (n=10); Control: dentin surface rinsed with deionized water (DI); SDF: dentin treated with one drop of 38% SDF (Riva Star step 1, SDI) using a micro brush. SDF+KI: treated as in SDF followed by KI (Riva Star step 2). Two different protocols were followed to form six subgroups; RINSE+PAA: rinsed with DI, applied 20% PAA (Cavity Conditioner, GC) and rinsed off; DRY: allowed to air dry with no-rinse/ conditioner. RMGI (Fuji II LC, GC) was then placed on dentin followed by composite build-up. After 24h storage in 37°C DI, MTBS beams (1mmx1mm) were produced and tested in Bisco Micro Tensile Tester. Data (MPa) was analyzed using ANOVA with multiple comparisons correction at a significance level of 0.05.
Results: Mean MTBS values ranged 14 to 22 MPa for groups. The highest values with Rinse+PAA protocol were obtained in SDF+KI group (21.6±9.3), which were significantly different from SDF and Control (p<0.05). For DRY protocol, SDF resulted in higher MTBS compared with SDF+KI and Control. Within SDF+KI DRY (14.0±7.2) was significantly lower than Rinse+PAA (p<00.1), while there was difference between rinsing protocols within Control or SDF (p>0.05).
Conclusions: Bond strength of RMGI to dentin was affected by SDF and SDF+KI application depending on rinsing and PAA protocol. SDF alone, either when rinsed followed by conditioning or when dried off from the surface without rinsing did not reduce RMGI bond to dentin. For SDF+KI, the rinsing and PAA application step was necessary to achieve dentin bond.
Methods: Occlusal enamel of 60 extracted human posterior teeth was removed. Exposed sound dentin was polished with 800-grit silicon carbide paper in three groups (n=10); Control: dentin surface rinsed with deionized water (DI); SDF: dentin treated with one drop of 38% SDF (Riva Star step 1, SDI) using a micro brush. SDF+KI: treated as in SDF followed by KI (Riva Star step 2). Two different protocols were followed to form six subgroups; RINSE+PAA: rinsed with DI, applied 20% PAA (Cavity Conditioner, GC) and rinsed off; DRY: allowed to air dry with no-rinse/ conditioner. RMGI (Fuji II LC, GC) was then placed on dentin followed by composite build-up. After 24h storage in 37°C DI, MTBS beams (1mmx1mm) were produced and tested in Bisco Micro Tensile Tester. Data (MPa) was analyzed using ANOVA with multiple comparisons correction at a significance level of 0.05.
Results: Mean MTBS values ranged 14 to 22 MPa for groups. The highest values with Rinse+PAA protocol were obtained in SDF+KI group (21.6±9.3), which were significantly different from SDF and Control (p<0.05). For DRY protocol, SDF resulted in higher MTBS compared with SDF+KI and Control. Within SDF+KI DRY (14.0±7.2) was significantly lower than Rinse+PAA (p<00.1), while there was difference between rinsing protocols within Control or SDF (p>0.05).
Conclusions: Bond strength of RMGI to dentin was affected by SDF and SDF+KI application depending on rinsing and PAA protocol. SDF alone, either when rinsed followed by conditioning or when dried off from the surface without rinsing did not reduce RMGI bond to dentin. For SDF+KI, the rinsing and PAA application step was necessary to achieve dentin bond.