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Micro-CT evaluation of internal adaptation in resin fillings with different dentin adhesives

Authors
 Seung-Hoon Han  ;  Sung-Ho Park 
Citation
 Restorative Dentistry & Endodontics, Vol.39(1) : 24-31, 2014 
Journal Title
Restorative Dentistry & Endodontics
ISSN
 2234-7658 
Issue Date
2014
Keywords
Dentin adhesive ; Internal adaptation ; Micro-CT ; Microleakage
Abstract
OBJECTIVES:
The purpose of present study was to evaluate the internal adaptation of composite restorations using different adhesive systems.
MATERIALS AND METHODS:
Typical class I cavities were prepared in 32 human third molars. The teeth were divided into the following four groups: 3-step etch-and-rinse, 2-step etch-and-rinse, 2-step self-etch and 1-step self-etch system were used. After the dentin adhesives were applied, composite resins were filled and light-cured in two layers. Then, silver nitrate solution was infiltrated, and all of the samples were scanned by micro-CT before and after thermo-mechanical load cycling. For each image, the length to which silver nitrate infiltrated, as a percentage of the whole pulpal floor length, was calculated (%SP). To evaluate the internal adaptation using conventional method, the samples were cut into 3 pieces by two sectioning at an interval of 1 mm in the middle of the cavity and they were dyed with Rhodamine-B. The cross sections of the specimens were examined by stereomicroscope. The lengths of the parts where actual leakage was shown were measured and calculated as a percentage of real leakage (%RP). The values for %SP and %RP were compared.
RESULTS:
After thermo-mechanical loading, all specimens showed significantly increased %SP compared to before thermo-mechanical loading and 1-step self-etch system had the highest %SP (p < 0.05). There was a tendency for %SP and %RP to show similar microleakage percentage depending on its sectioning.
CONCLUSIONS:
After thermo-mechanical load cycling, there were differences in internal adaptation among the groups using different adhesive systems.
Files in This Item:
T201400781.pdf Download
DOI
10.5395/rde.2014.39.1.24
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Park, Sung Ho(박성호) ORCID logo https://orcid.org/0000-0003-2171-235X
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/98368
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