Einfluss verschiedener Bleichmittelkonzentrationen auf die Mikrozugfestigkeit von Adhäsivsystemen

The aim of the present study was to evaluate the influence different bleaching agents and concentrations on microtensile bond strength of different dentin adhesives in class V cavities. 135 freshly extracted third molars were included in this study. In all teeth cervical class V dentinal cavities were prepared allowing the simulation of dentin perfusion. The specimens were randomly assigned to nine experimental groups of fifteen each: S0: Syntac/ control; S17: Syntac/ Perfect Bleach 17%; S38: Syntac/ Opalescene Xtra Boost 38%; X0: XP Bond/ control; X17: XP Bond/ Perfect Bleach 17%; X38: XP Bond/ Opalescene Xtra Boost 38%; A0: AdheSE One/ control; A17: AdheSE One/ Perfect Bleach 17%; A38: AdheSE One/ Opalescene Xtra Boost 38%. Bleaching was performed 8 hours at 36°C for 7 days. Between the ranges all samples were stored in physiological saline for 16 hours. The dentin adhesives used as recommended by manufactures instruction were applied on a standardized dentin surface. Microtensile bond strengths of the above mentioned bonding agents was measured using a universal testing machine. For the nine test series following tensile bond strengths were evaluated (mean values and standard deviations in MPa): GroupS0S17S38X0X17X38A0A17A38 Microtensile bond strength25,8921,4417,0822,1518,9914,6124,3318,9717,29 ±2,972,051,943,532,962,246,942,795,78 Keywords: Dentinadhesive, Mikrozugfestigkeit, Bleichtherapie, dentin adhesive, microtensile bond strength, Tooth bleaching