Restorative Dentistry and Endodontics
- Volume 25 Issue 2
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- Pages.243-253
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- 2000
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- 2234-7658(pISSN)
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- 2234-7666(eISSN)
EFFECTS OF DENTIN SURFACE WETNESS OR DESICCATION AFTER ACID ETCHING ON DENTIN BONDING
산부식후 상아질 표면의 습윤 또는 건조가 상아질 결합에 미치는 영향
- Yang, Won-Kyung (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
- Kwon, Hyuk-Choon (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
- Son, Ho-Hyun (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
- Published : 2000.06.05
Abstract
The purpose of this in vitro study was to evaluate dentin bonding by two different dentin bonding systems(DBS) using acetone based primer or adhesive [All Bond 2(AB2), One Step(OS)] when they were applied by wet or dry bonding technique. Morphology of resin-dentin interface and hybrid layer thickness(HLT) were investigated using Confocal Laser Scanning Microscope(CLSM) and compared to shear bond strength(SBS). 72 extracted sound human molars were randomly divided into 4 groups of 18 teeth each - Group 1.(AW); AB2 by wet bonding. Group 2(AD); AB2 by dry bonding. Group 3.(OW); OS by wet bonding, Group 4.(OD); OS by dry bonding. In 6 teeth of each group, notch-shaped class V cavities(depth 2mm) were prepared on buccal and lingual surface at the cementoenamel juction(12 cavities per group). To obtain color contrast in CLSM observation, bonding resins of each DBS were mixed with rhodamine B and primer of AB2 was mixed with sodium fluorescein. Prepared teeth of each group were treated with AB2, OS, respectively according to the manufacturer's instructions except for dentin surface moisture treatment after acid etching. In group 1 and 3, after acid etching, excess water was removed with wet tissue(Kimwipes), leaving consistently shiny, visibly hydrated dentin surface. In group 2 and 4, dentin surface was dried for 10 seconds at 1 inch distance. The treated teeth were then packed with composite resin(