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논문 기본 정보

자료유형
학술저널
저자정보
오소람 (경희대학교) 김현주 (서울대학교치과병원) 김현정 (경희의료원) Sibel A. Antonson (College of Dental Medicine Nova Southeastern University USA.) 김선영 (서울대학교)
저널정보
한국생체재료학회 생체재료학회지 생체재료학회지 제26권 제2호
발행연도
2022.6
수록면
302 - 312 (11page)
DOI
https://doi.org/10.1186/s40824-022-00267-5

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초록· 키워드

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Background: The aim of this study was to evaluate the influence of increased irradiation distance on the flexural strength (FS), dentin micro-shear bond strength (μSBS), and the degree of conversion (DC) of bulk-fill flowable, con ventional flowable, and packable resin composites. Methods: The resin composites tested were Surefil® SDR™ (SDR), Filtek Z350 XT Flowable Restorative A2 shade (Z3F), and Filtek Z350 XT Universal Restorative A2 shade (Z3P). Specimens were cured at four irradiation distances (0, 2, 4, and 8 mm) with an Elipar DeepCure-S LED curing light for 20 s. FS tests were performed (n= 15) using bar-shaped specimens (8 mm × 2 mm × 2 mm) of the resin composites. μSBS tests were performed on the occlusal surfaces of extracted third molars from humans that were ground to expose dentin (n= 15). DC was measured by using Raman spectroscopy on the top and bottom surfaces of disk specimens (2-mm thick) (n= 3). To further investigate whether extended irradiation times could compensate for reduced irradiance, additional Z3P specimens were prepared, which were light-cured at 8-mm distances for 40 and 60 s and subjected to FS tests, μSBS tests, and Raman spectroscopy. Both two-way and one-way ANOVA were used for statistical analyses. Results: Both FS and DC of Z3P specimens cured at an 8-mm distance were significantly lower than those cured at shorter distances (p < 0.05), whereas the FS and DC of the Z3F and SDR specimens were not significantly influenced by increasing distances. The μSBSs of the three types of resin composites reduced with increasing irradiation dis tances. The FS, μSBS, and DC of the Z3P specimen light-cured at 8 mm for 40 s were comparable to those of the Z3P specimen cured at 0 mm for 20 s. Conclusions: Increasing the irradiation distance to 8 mm can have a deleterious influence on mechanical perfor mances, including the FS, DC, and dentin μSBS, of the resin composites polymerized with high-irradiance light curing units

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