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BH Cho 3 Articles
Surface roughness of experimental composite resins using confocal laser scanning microscope
JH Bae, MA Lee, BH Cho
J Korean Acad Conserv Dent 2008;33(1):1-8.   Published online January 31, 2008
DOI: https://doi.org/10.5395/JKACD.2008.33.1.001
AbstractAbstract PDFPubReaderePub

The purpose of this study was to evaluate the effect of a new resin monomer, filler size and polishing technique on the surface roughness of composite resin restorations using confocal laser scanning microscopy. By adding new methoxylated Bis-GMA (Bis-M-GMA, 2,2-bis[4-(2-methoxy-3-methacryloyloxy propoxy) phenyl] propane) having low viscosity, the content of TEGDMA might be decreased. Three experimental composite resins were made: EX1 (Bis-M-GMA/TEGDMA = 95/5 wt%, 40 mm nanofillers); EX2 (Bis-M-GMA/TEGDMA = 95/5 wt%, 20 mm nanofillers); EX3 (Bis-GMA/TEGDMA = 70/30 wt%, 40 mm nanofillers). Filtek Z250 was used as a reference.

Nine specimens (6 mm in diameter and 2 mm in thickness) for each experimental composite resin and Filtek Z250 were fabricated in a teflon mold and assigned to three groups. In Mylar strip group, specimens were left undisturbed. In Sof-lex group, specimens were ground with #1000 SiC paper and polished with Sof-lex discs. In DiaPolisher group, specimens were ground with #1000 SiC paper and polished with DiaPolisher polishing points. The Ra (Average roughness), Rq (Root mean square roughness), Rv (Valley roughness), Rp (Peak roughness), Rc (2D roughness) and Sc (3D roughness) values were determined using confocal laser scanning microscopy. The data were statistically analyzed by Two-way ANOVA and Tukey multiple comparisons test (p = 0.05).

The type of composite resin and polishing technique significantly affected the surface roughness of the composite resin restorations (p < 0.001). EX3 showed the smoothest surface compared to the other composite resins (p < 0.05). Mylar strip resulted in smoother surface than other polishing techniques (p < 0.05).

Bis-M-GMA, a new resin monomer having low viscosity, might reduce the amount of diluent, but showed adverse effect on the surface roughness of composite resin restorations.

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Effect of a new resin monomer on the microleakage of composite resin restorations
JH Bae, YK Kim, PY Yoon, MA Lee, BH Cho
J Korean Acad Conserv Dent 2007;32(5):469-475.   Published online September 30, 2007
DOI: https://doi.org/10.5395/JKACD.2007.32.5.469
AbstractAbstract PDFPubReaderePub

The purpose of this study was to evaluate the effect of a new resin monomer on the microleakage of composite resin restorations. By adding new methoxylated Bis-GMA (Bis-M-GMA, 2,2-bis[4-(2-methoxy-3-methacryloyloxy propoxy) phenyl] propane) having low viscosity, the content of TEGDMA which has adverse effects on polymerization shrinkage might be decreased. As a result, microleakage might be improved.

2 mm × 2 mm × 2 mm cavities with occlusal margins in enamel and gingival margins in dentin were prepared on buccal and lingual surfaces of 40 extracted human premolars. Prepared teeth were randomly divided into four groups and restored with Clearfil SE bond (Kuraray, Japan) and one of experimental composite resins; EX1, Experimental composite resin1 (Bis-M-GMA/TEGDMA = 95/5 wt%, 40 nm nanofillers); EX2, Experimental composite resin2 (Bis-M-GMA/TEGDMA = 95/5 wt%, 20 nm nanofillers); EX3, Experimental composite resin3 (Bis-GMA/TEGDMA = 70/30 wt%, 40 nm nanofillers); and Filtek Z250 (3M ESPE, USA) was filled as a control group. The restored teeth were thermocycled, and immersed in 2% methylene blue solution for 24 hours. The teeth were sectioned buccolingually with a low speed diamond saw and evaluated for microleakage under stereomicroscope. The data were statistically analyzed by Pearson Chi-Square test and Fisher Exact test (p = 0.05).

The microleakage scores seen at the enamel margin were significantly lower than those of dentin margin (p = 0.007). There were no significant differences among the composite resins in the microleakage scores within each margin (p > 0.05). Bis-M-GMA, a new resin monomer having low viscosity, might in part replace high viscous Bis-GMA and might improve the quality of composite resin.

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  • Sealing Ability of Three Different Materials Used as Retrograde Filling
    Ji-Hoon Park, Seung-Bok Kang, Yong-Hoon Choi, Ji-Hyun Bae
    Journal of Korean Dental Science.2012; 5(2): 60.     CrossRef
  • Surface roughness of experimental composite resins using confocal laser scanning microscope
    JH Bae, MA Lee, BH Cho
    Journal of Korean Academy of Conservative Dentistry.2008; 33(1): 1.     CrossRef
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Aging effect on the microtensile bond strength of self-etching adhesives
JS Park, JS Kim Kim, HH Son, HC Kwon, BH Cho
J Korean Acad Conserv Dent 2006;31(6):415-426.   Published online November 30, 2006
DOI: https://doi.org/10.5395/JKACD.2006.31.6.415
AbstractAbstract PDFPubReaderePub

In this study, the changes in the degree of conversion (DC) and the microtensile bond strength (MTBS) of self-etching adhesives to dentin was investigated according to the time after curing. The MTBS of Single Bond (SB, 3M ESPE, USA), Clearfil SE Bond (SE, Kuraray, Japan), Xeno-III (XIII, Dentsply, Germany), and Adper Prompt (AP, 3M ESPE, USA) were measured at 48h, at 1 week and after thermocycling for 5,000 cycles between 5℃ and 55℃. The DC of the adhesives were measured immediately, at 48h and at 7 days after curing using a Fourier Transform Infra-red Spectrometer. The fractured surfaces were also evaluated with scanning electron microscope. The MTBS and DC were significantly increased with time and there was an interaction between the variables of time and material (MTBS, 2-way ANOVA, p = 0.018; DC, Repeated Measures ANOVA, p < 0.001). The low DC was suggested as a cause of the low MTBS of self-etching adhesives, XIII and AP, but the increase in the MTBS of SE and AP after 48h could not be related with the changes in the DC. The microscopic maturation of the adhesive layer might be considered as the cause of increasing bond strength.

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Citations to this article as recorded by  
  • Effect of Plasma Deposition Using Low-Power/Non-thermal Atmospheric Pressure Plasma on Promoting Adhesion of Composite Resin to Enamel
    Geum-Jun Han, Jae-Hoon Kim, Sung-No Chung, Bae-Hyeock Chun, Chang-Keun Kim, Byeong-Hoon Cho
    Plasma Chemistry and Plasma Processing.2014; 34(4): 933.     CrossRef
  • The effect of priming etched dentin with solvent on the microtensile bond strength of hydrophobic dentin adhesive
    Eun-Sook Park, Ji-Hyun Bae, Jong-Soon Kim, Jae-Hoon Kim, In-Bog Lee, Chang-Keun Kim, Ho-Hyun Son, Byeong-Hoon Cho
    Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 42.     CrossRef
  • Effect of curing methods of resin cements on bond strength and adhesive interface of post
    Mun-Hong Kim, Hae-Jung Kim, Young-Gon Cho
    Journal of Korean Academy of Conservative Dentistry.2009; 34(2): 103.     CrossRef
  • Difference in bond strength according to filling techniques and cavity walls in box-type occlusal composite resin restoration
    Eun-Joo Ko, Dong-Hoon Shin
    Journal of Korean Academy of Conservative Dentistry.2009; 34(4): 350.     CrossRef
  • The effect of various bonding systems on the microtensile bond strength of immediate and delayed dentin sealing
    Jin-hee Ha, Hyeon-Cheol Kim, Bock Hur, Jeong-Kil Park
    Journal of Korean Academy of Conservative Dentistry.2008; 33(6): 526.     CrossRef
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