IADR Abstract Archives
Influence of Water Storage on Adhesive Interfaces Using Impedance Methodology
Objectives: Quantify the adhesive interface degradation during two years using electrochemical impedance. Methods: Four adhesive systems (Clearfil SE Bondâ - Optibond Solo +â - Etch & Prime 3.0â - Prime and Bond NTâ) were associated with two materials (P60â composite resin, Dyract APâ compomer) according 6 groups of five teeth (1 : OS + P60 ; 2 : EP + P60 ; 3 : PB + Dyract ; 4 : H3PO4 + PB + Dyract ; 5 : H3PO4 + PB + P60, 6 : SEB + P60). Dentin disks 2 mm thick were embedded in a hollow polyurethane cylinder and immersed in a 10-1 KCl solution. The system used was a permeation cell. : two titanium platinum-plated electrodes immersed in a 10-1 KCl solution were attached to a potentiostat connected to a microcomputer controlled frequency response analyser and a 5 mV potential over a frequency range of 1 Hz to 65 kHz was applied. The current was measured to calculate the impedance (complex number). The real part corresponding to the resistance of sample was noted. The measurements were repeated at 1, 2, 4, 6, 18, 24 months. Data were statistically analysed using ANOVA and PLSD Test. Results:
| Materials – Time | 1 | 2 | 6 | 18 | 24 |
| OS + P60 | 30,5 1 | 35,1 4 | 36,1 7 | 27 10 | 42,6 14 |
| EP + P60 | 24,4 2 | 30,9 | 27 | 22,2 | 44,3 15 |
| PB + DY | 24,9 3 | 34,4 5 | 33,7 8 | 29,6 11 | 42,2 16 |
| H3PO4 + PB + DY | 6,7 a,1,2,3 | 19,1 b,4,5,6 | 14,5 7,8,9 | 5,8 b,c,10,11,12 | 23a,c,14,15,16,17 |
| H3PO4 + PB + P60 | 18,1 d,e,f | 31,8 d,g | 25,1 e,h,i | 16,4 g,h,j,13 | 34,7 f,i,j |
| SEB + P60 | 21,4 k | 39,0 6 | 37,5 9 | 36,5 12,13 | 42,3 k,17 |
Conclusions: This study showed that for all systems a quantitative degradation may be observed.