Effect of variations in surface wetness of etched dentin on long-term bonding durability of the wet-adhesive system

概要

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We conducted an in vitro study to evaluate the effect of variations in the surface wetness of etched dentin on the long-term bonding durability (up to one year) of the Single Bond adhesive system. After rinsing the etchant, the dentin surfaces were prepared in one of the following three conditions: 1. Kept moist by removing excess water by blotting with a cotton pellet (the wet method), 2. Dried for 10 seconds with an air-blast (the dry method), 3. Dried for 10 seconds and then re-moistened by water rinsing for 10 seconds and removing excess water by blotting (the re-wet method). For the wet method, the bond strength was constant and there were adhesive failures in the fractured dentin surfaces throughout the entire observation period. Drying the dentin with an air syringe after rinsing off the etchant caused significantly reduced bond strength and there was degradation of the fractured surfaces after one month. Although re-wetting the dentin with water almost re-established the bond strength, degraded dentin surfaces were noted at one year. These findings suggest that the Single Bond system exhibits excellent bonding durability on wet dentin surfaces. Drying dentin surface harms bonding durability, and re-wetting with water is not enough to compensate for the dehydration of the dentin surface caused by the air-blast.
大阪歯科学会の論文