Paramolar tubercle이 융합된 상악 제2소구치의 비외과적 근관치료

최다경(Da-Kyung Choi),장훈상(Hoon-Sang Chang),황윤찬(Yun-Chan Hwang),황인남(In-Nam Hwang),오원만(Won-Mann Oh),박찬(Chan Park),이빈나(Bin-Na Lee1) 대한턱관절교합학회 2021 구강회복응용과학지 Vol.37 No.4

Comparison of TheraCal LC, Mineral trioxide aggregate, and Formocresolas pulpotomy agents in rat molar

Bin-Na Lee(이빈나),Young-Sang Song(송영상),Go-Woon Lee(이고운),Young-Hoon Kim(김영훈),Hoon-Sang Chang(장훈상),Yun-Chan Hwang(황윤찬),Won-Mann Oh(오원만),In-Nam Hwang(황인남) 대한치과재료학회 2017 대한치과재료학회지 Vol.44 No.2

TheraCal LC, a new light-cured, resin-modified calcium silicate-filled base/liner material, has been introduced as a pulpotomy agent. The aim of this study was to evaluate the capacity of hard tissue formation and pulpal response after pulpotomy with TheraCal LC. Twenty-two 9-week-old male rats were anesthetized, cavities were prepared in maxillary first molars and pulps were capped with formocresol (FC), mineral trioxide aggregate (MTA), and TheraCal LC. Specimens obtained from rats were scanned using a high-resolution micro CT system. The specimens were prepared and evaluated histologically, and immunofluorescence assay was performed to assess the dentin matrix protein-1 (DMP-1) expression. On micro CT analysis, the MTA and TheraCal LC groups showed thicker hard tissue formation than the FC group. On hematoxylin and eosin (H&E) staining, MTA and TheraCal LC groups showed dentine bridge formation with vital pulp beneath the materials. On immunofluorescence analysis, DMP-1 was highly expressed in the TheraCal LC group compared to the FC group. TheraCal LC showed similar capacity to form hard tissue as MTA when it was used as a pulpotomy agent. Because of its good manipulation and faster setting time compared to MTA, TheraCal LC could be considered as a good alternative to MTA.

특성화 고등학교의 쇼윈도 디스플레이 디자인 교육 현황 연구

이빈나(Lee, Bin Na),김관배(Kim, Kwan Bae) 한국디지털디자인협의회 2014 (사)한국디지털디자인협의회 conference Vol.2014 No.5

Bonding efficacy of cured or uncured dentin adhesives in indirect resin

장지현,이빈나,장훈상,황윤찬,오원만,황인남,Jang, Ji-Hyun,Lee, Bin-Na,Chang, Hoon-Sang,Hwang, Yun-Chan,Oh, Won-Mann,Hwang, In-Nam The Korean Academy of Conservative Dentistry 2011 Restorative Dentistry & Endodontics Vol.36 No.6

연구목적: 본 연구는 간접 레진수복시 상아질 접착제의 중합 여부가 레진인레이와 상아질간의 미세인장결합강도와 결합계면의 형태에 미치는 영향을 공초점 현미경 관찰을 통하여 평가하고자 하였다. 연구 재료 및 방법: 24개의 발거된 대구치를 절단하여 교합면 상아질을 노출시켰다. 수복 방법에 따라 크게 간접 레진수복과 직접 레진수복의 두 군으로 나누었다. 간접 레진수복군은 임시 수복하여 1주일 후, 상아질 접착 과정에 따라 4군(OB-C와 OB-NC군, OS-C와 OS-NC군)으로 나누었다. 간접 레진수복군은 산부식 처리된 상아질면에 OptiBond FL (Kerr) 또는 One-Step (Bisco) 상아질 접착제를 중합 여부에 따라 나누어 적용하였다. 처리된 상아질면에 제작된 3 mm 높이의 레진 인레이(Tescera, Bisco)를 Variolink II (Ivoclar Vivadent)를 사용하여 제조사의 지시에 따라 합착하였다. 직접 레진수복군은 산부식 처리된 상아질면에 상아질 접착 후, 복합레진 (Estelite${\Sigma}$, Tokuyama)으로 즉시 수복하였다(OB-D군, OS-D군). 수복을 마친 모든 치아는 24시간 후, 미세인장 결합 강도 평가와 공초점 레이저 주사 현미경 관찰(CLSM)을 시행하였다. 결과: 간접 레진수복군은 직접 레진수복군에 비하여 낮은 미세인장결합강도를 나타내었으며, 상아질 접착제를 광중합한 군(OB-C군, OS-C군)이 광중합을 시행하지 않은 군(OB-NC군, OS-NC군)에 비하여 높은 미세인장결합강도를 나타내었다. 접착 계면에 대한 CLSM 관찰에서 상아질 접착제를 광중합한 군에서 더 분명하고 균일한 혼성층이 관찰되었다. 상아질 접착제를 광중합하지 않은 군에서는 혼성층이 불분명하거나 거의 관찰되지 않았다. 결론: 간접 레진수복물의 합착시 레진시멘트의 적용 전에 상아질 접착제의 광중합은 분명하고 균일한 혼성층의 형성하며, 이는 결합강도의 향상에 기여한다. Objectives: This study examined the effect of the uncured dentin adhesives on the bond interface between the resin inlay and dentin. Materials and Methods: Dentin surface was exposed in 24 extracted human molars and the teeth were assigned to indirect and direct resin restoration group. For indirect resin groups, exposed dentin surfaces were temporized with provisional resin. The provisional restoration was removed after 1 wk and the teeth were divided further into 4 groups which used dentin adhesives (OptiBond FL, Kerr; One-Step, Bisco) with or without light-curing, respectively (Group OB-C, OB-NC, OS-C and OS-NC). Pre-fabricated resin blocks were cemented on the entire surfaces with resin cement. For the direct resin restoration groups, the dentin surfaces were treated with dentin adhesives (Group OB-D and OS-D), followed by restoring composite resin. After 24 hr, the teeth were assigned to microtensile bond strength (${\mu}TBS$) and confocal laser scanning microscopy (CLSM), respectively. Results: The indirect resin restoration groups showed a lower ${\mu}TBS$ than the direct resin restoration groups. The ${\mu}TBS$ values of the light cured dentin adhesive groups were higher than those of the uncured dentin adhesive groups (p < 0.05). CLSM analysis of the light cured dentin adhesive groups revealed definite and homogenous hybrid layers. However, the uncured dentin adhesive groups showed uncertain or even no hybrid layer. Conclusions: Light-curing of the dentin adhesive prior to the application of the cementing material in luting a resin inlay to dentin resulted in definite, homogenous hybrid layer formation, which may improve the bond strength.

Effects of RetroMTA on osteoblastic differentiation in MC3T3-E1 cells

Hyo-Il Lee(이효일),Sung-Hyeon Choi(최성현),Ji-Hyun Jang(장지현),Hoon-Sang Chang(장훈상),Yun-Chan Hwang(황윤찬),In-Nam Hwang(황인남),Bin-Na Lee(이빈나),Won-Mann Oh(오원만) 대한치과재료학회 2018 대한치과재료학회지 Vol.45 No.2

Mineral trioxide aggregate (MTA) provides a very good sealing, acceptable biocompatibility, dentin bridge formation and osteo-inductive effect. However, MTA has a few drawbacks. RetroMTA including calcium-zirconia complex has been developed to overcome drawbacks of MTA, especially long setting time and difficult handling characteristics. Therefore, the aim of this study was to evaluate the effects of RetroMTA on biocompatibility, osteogenic differentiation and mineralization in MC3T3-E1 cells compared with conventional MTA. Cytotoxicity was assessed by WST-1 assay. The gene expression of osteogenic markers was detected by real-time PCR. ALP activity and mineralization behavior were evaluated using ALP and alizarin red staining. There was no statistically significant difference between ProRoot MTA and RetroMTA with material extracts at dilutions of 1/4, 1/10 and 1/50 in cell viability assay. Expression of osteogenic markers in both ProRoot MTA and RetroMTA groups was significantly higher than in control group. In the mineralization assay, RetroMTA showed significantly higher formation of mineralized nodules than in control. In conclusion, RetroMTA promotes osteogenic differentiation and potential mineralization. It appears to be a potential alternative to ProRoot MTA as a root-end filling material.

상아질 봉쇄 시기와 임시 수복 방법이 상아질과 복합레진의 결합강도에 미치는 영향

장지현(Ji-Hyun Jang),최영중(Young-Jung Choi),이빈나(Bin-Na Lee),장훈상(Hoon-Sang Chang),황윤찬(Yun-Chan Hwang),오원만(Won-Mann Oh),황인남(In-Nam Hwang) 대한치과재료학회 2015 대한치과재료학회지 Vol.42 No.4

The purpose of this study was to evaluate the effect of timing of dentin sealing and provisional restoration methods on the bond strength of composite resin to dentin. Flat dentin surfaces were prepared and the teeth were divided into three groups: control, resinrestoration with immediate dentin sealing (IDS), and resin restoration with delayed dentin sealing (DDS). For the control group, a dentin surface was bonded by using dual-curing dentin adhesive (Excite DSC) and restored with resin immediately. For the IDS groups, a dentin was sealed with OptiBond FL (OB) or Hybrid Coat (HC), and it was restored with following 3 provisional restoration methods: SQ/PQ/CQ {SQ, water-soluble separator (SEP) + provisional resin; PQ, petroleum jelly + provisional resin; CQ, temporary cement (Cavitec) + provisional resin}. For the DDS groups, a dentin was temporized with 2 provisional restoration methods: Q/CQ (Q, provisional resin only) without dentin sealing. After a week, the provisional restoration was removed and cleaned. The treated dentin surface was bonded using Excite DSC and restored with resin, followed by microtensile bond strength (μTBS) tests. The μTBS of control and the IDS-OB groups were not significantly different (P>0.05). The DDS groups presented lower μTBS than control and the IDS-OB groups (P<0.05). The IDS-HC groups were exhibited lowest μTBS than other groups (P<0.05). There was no significant difference in the μTBS regardless of provisional restorative method in the IDS groups (P>0.05). However, using CQ significantly lower the μTBS than using Q in the DDS groups (P<0.05). IDS with a etch-and-rinse type dentin bonding agent improved the bond strength. The use of ZOE-containing cement on the unsealed dentin surface decreased the μTBS.

불소바니쉬 적용 후 심미수복재료의 색안정성 평가

장철훈(Chul-Hoon Jang),장동길(Dong-Gil Jang),이빈나(Bin-Na Lee),장훈상(Hoon-Sang Chang),황윤찬(Yun-Chan Hwang),오원만(Won-Mann Oh),황인남(In-Nam Hwang) 대한치과재료학회 2021 대한치과재료학회지 Vol.48 No.3

The objective of present study was to compare the color stability of esthetic materials after application of fluoride varnishes. Esthetic restorative materials including composite resin (Filtek Z350 XT, 3M ESPE, MN, USA), resin modified glass-ionomer (RMGI, Fuji II LC, GC Co., Tokyo, Japan), and giomer (Beautifil Flow Plus F00, Shofu Inc., Kyoto, Japan) were used in this study. Cavity shield (3M ESPE, MN, USA) and V-varnish premium (Vericom, Seoul, Korea) were used as the fluoride varnishes. 30 samples of each restorative materials were prepared, which were divided into 10 each, among three groups. Group I were stored in distilled water, which were used as the control, Group II were applied with Cavity shield and Group III were applied with V-varnish premium. All specimens were stored in the distilled water at 60 ℃ for 30 days for the accelerated test. Samples were then subjected to colorimetric analysis. Data collected was statistically analyzed using one way ANOVA and Tukeys post-hoc test (p=0.05). The color change before and after application of varnish was observed in all experimental groups. Especially RMGI showed highest ΔE * value (p<0.05). The color change according to the accelerated test showed no significant difference in the varnish application group and the control group. Giomer and RMGI applied with Cavity shield showed more color change than V-varnish applied group, despite no significant differences. Present study concludes that color stability of esthetic restoration materials can be affected by application of fluoride varnish. Especially, RMGI showed a large color change compared to the composite resin and giomer, which suggested that careful attention should be paid to clinical application.

하악 제2대구치의 술전 교정적 정출술을 동반한 의도적 재식술

김종순(Jong-Soon Kim),장훈상(Hoon-Sang Chang),황윤찬(Yun-Chan Hwang),황인남(In-Nam Hwang),오원만(Won-Mann Oh),이빈나(Bin-Na Lee) 대한턱관절교합학회 2021 구강회복응용과학지 Vol.37 No.4

Effects of various root canal sealers on tooth discoloration and internal bleaching

Yi-San Kim(김이산),Sung-Hyeon Choi(최성현),Kyeong-Eun Youn(윤경은),Ji-Hyun Jang(장지현),Hoon-Sang Chang(장훈상),Yun-Chan Hwang(황윤찬),In-Nam Hwang(황인남),Won-Mann Oh(오원만),Bin-Na Lee(이빈나) 대한치과재료학회 2019 대한치과재료학회지 Vol.46 No.1

There are several causes of tooth discoloration following root canal treatment. In this study, we evaluated the effects of sealers on tooth discoloration and internal bleaching. Twenty-four teeth were divided into 4 groups: control group, AH plus, Endosequece BC, and MTA fillapex group. Root canal filling was performed using each sealer conventionally and non-vital bleaching was performed with sodium perborate. The L, a, and b values were measured using Vita easyshade. Tooth discoloration after root canal treatment occurs irrespective of the type of sealers and may cause discoloration with only gutta-percha cone. The effect of non-vital bleaching following the use of calcium silicate-based sealers such as Endosequece BC and MTA fillapex was higher than that of AH plus. Therefore, it needs careful use of sealers in endodontics and calcium silicate-based sealers have advantages of bleaching in case of discolored tooth.

브랜드 자산 모델을 통한 브랜드 경쟁력 지수 평가

全永鎬,李彬娜,林凞燮 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-

Brand asset management to build powerful brand asset is needed to have more powerful comparative advantage. In this study, critical factors of the structure of brand asset are considered. For this purpose, the relationships between the brand asset and the structure of brand asset are evaluated. And measurement of the competitive power of the specific brand at the point of clients by describing the systematic measuring methodology of the brand asset and its applications is studied. And then, the model that can be used to solve and improve the general realities and level of brand management is proposed. For this, we recognized the strategic importance of brand asset and the brand asset management with previous studies. And we improved the model that showed that the increasing of brand competitive power makes purchasing intention and the brand loyalty increase at the point of clients by pointing out the limit of previous studies. With this improved model, we investigated the brand competitive power on digital electric home appliances about images, sounds, and communications. To test this model statistically, the structural equation model that is most popular in the latest is used. By using the result of this study, companies will be able to measure of their own and the other's brand competitive power and understand the method of benchmarking and the improvements. Moreover, the government will be able to draw up the plan and the system that support to secure the brand competitive power and bring up the global brand that have international competitive power.