상아질에 대한 자가 산부식 접착제의 전단결합강도와 SEM 분석 비교

조영곤,노기선,김수미,이영곤,정진호,기영재 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.3

The purpose of this study was to compare shear bond strength and interfacial pattern of composite bonded to dentin using self-etching adhesive systems. Sixty extracted human molars with exposed occlusal dentin were divided into four groups and bonded with four adhesives and composites: Single Bond/Filtek Z 250(SB), Tyrian SPE-One-Step Plus/Aelitefil(TY), Prompt L-Lpop/Filtek Z 250(LP), and one-Up Bond F/Palfique Toughwell(OU). The results of this study were as follows; 1. Shear bond strength for OU was significantly lowet than that of other groups(p<0.05). No significant difference was founded among SB, TY, and LP. 2. Failure modes to dentin showed adhesive and mixed for SB, TY, and LP, but them for OUT showed adhesive in all spceimens. 3. Dentin-resin interface showed close adaptation for SB, TY, and LP, but it showed gap for OU. 4. The hybrid layers for TY, LP, OU were thinner than that of SB. Adhesive layers were observed between composite and hybrid layer, which were 5 ㎛ thick for TY and 10 ㎛ thick for OU.

자가 산부식 프라이머의 적용시간이 상아질의 미세인장 결합강도에 미치는 영향

조영곤,이영곤,김종욱,박병철,김종진,최희영,진철희,유상훈 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.5

This study evaluated the influence of application time of self-etching primers on microtensile bond strength (μTBS) to dentin using three self-etching primer adhesive systems. Dentin surfaces were exposed from forty-eight human molars. They were conditioned with three self-etching primers (Clearfil SE Bond [SE], Unifil Bond [UF], Tyrian SPE + One Step Plus [TY]) and different primining times (10s, 20s, 30s and 40s). Composite resins were bonded to dentin surfaces and specimens were made. μTBS was tested and statistically compared using by one-way ANOVA and Tukey's Test. The results of this study presented that priming time for 10s in SE and UF groups and for 30s and 40s in TY group was highly decreased μTBS to dentin.

상아질에 적용된 재 습윤제가 미세인장 결합강도에 미치는 영향

강희영,조영곤,김종욱,박병철,유상훈,진철희,최희영,기영재 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.2

This study investigated that the effect of rewetting agent on dentinal microtensile bond strength (μTBS). Human molars were sectioned to expose the superficial dentin surfaces. Samples were divided into two groups according to type of adhesives-Single Bond (S) and One-Step (0)], and again subdivided into five groups by different dentin surface treatment-dry for 15s (D) , blot dry (BD) or dry for 15s, and rewet with different rewetting agents[distil1ed water (DW), Gluma Desensitizer (GD) and Aqua-Prep (AP)]for 30s. After application of adhesive, composite resin was built up on the bonding surface. Each tooth was sectioned to obtain stick with 1mm^(2) cross sectional area and the μTBS was determined by EZ test. In the S group, the mean μTBS of GD, AP and BD group was significantly higher than that of DW and D group (p < 0.05). In the 0 group, the mean μTBS of AP, GD, BD and DW group was significantly higher than that of D group (p < 0.05). The data suggested that Gluma Desensitizer and Aqua-Prep could be successfully used as rewetting agents, and Distilled water could be acceptable in aceton based adhesive system only.

IRM 임시수복이 상아질 접착제의 변연 미세누출에 미치는 영향

조영곤,김현경,이영곤 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.1

This study investigated the influence of IRM on marginal microleakage of 5th generation adhesives. Class V cavities with gingival margins in dentin were prepared on both buccal and lingual surfaces of 60 extracted human molar teeth. Prepared teeth were randomly divided into six groups. Group 1 and 4 received no temporary restoration with IRM. Group 2 and 5 were covered with IRM mixed at P/L ratio(10g/1g). The temporary restorations were removed mechanically with an ultrasonic scaler after one-week storage in distilled water. The cavities were restored using one of two adhesives and composites; Single Bond/Filtek Z 250(Group 1, 2 and 3), UniFil Bond/UniFil F(Group 4, 5 and 6). Following one day storage in distilled water, the restored teeth were thermocycled for 500 cycles(between 5℃ and 55℃)( and immersed in 2% methylene blue for dye penetration testing. The results were analysed using Kruskal-Wallis Test. Mann-Whitney and Wilcoxon singed ranked test at a significance level of 0.05. The results of this study were as follows: 1. Ranking of mean microleakage scores at the enamel margins was Group 1<Group 3<Group 2<Group 4<Group 5<Group 6. The microleakage of Group 6 was significantly higher than that of Groups 1, 2 and 3(p<0.05). 2. At the enamel margins, without regard to pretreatment with IRM, the microleakage of Single Bond was lower than that of UniFil Bond. 3. Ranking of mean microleakage scores at the dentin margins was Group 4<Group 1<Group 5<Group 6<Group 3<Group 2. But there were no significant difference among microleakage of each group(p>0.05). 4. At the dentin margins, the microleakage of the group not pretreated with IRM was lower than that of the group pretreated with IRM. And the microleakage of UniFil Bond was lower than that of Single Bond. 5. Compared with microleakages between the enamel and dentin margins of each groups, Group 1, 2, 3, 4, 5 and 6 at dentin margin were higher microleakage than those at enamel margin. There were significant difference between enamel and dentin microleakage of Group 2 and 3(p<0.05).

한우 전문경영체의 기술 및 경영 특성에 관한 연구

조광호,김영근 한국농업정책학회, 한국축산경영학회 2003 농업경영정책연구 Vol.30 No.3

This paper tries to show managerial strategy and improving direction by exploring managerial and technological status of commercial farms which specialize in producing Hanwoo. for this study 72 commercial Hanwoo farms were surveyed during July-August in 2002. There still remain many things to be improved, though commercial Hanwoo farms have improved much in terms of technology and management a lot. They need to bring managerial mind into their business such as investigating their inputs and analyzing financial status. They also need to use computer and internet in acquiring the domestic and foreign information on prices, marketing and technology. In order to raise productivity and reduce cost, there should be given priorities to producing and raising good calves, extending cow barn, prevention of epidemic, keeping records of disease and supplying good roughage. The difficulties commercial Hanwoo farms meet with in raising cattle, were price instability, the shortage of managerial fund, and to supply roughage in order. To make high quality roughage self-sufficient, it is needed to support to supplying wet rice-straw and mid-ripe whole barley(grain with straw) ensilage.

삭제된 법랑질의 표면거칠기에 따른 도재 라미네이트의 전단결합강도에 관한 연구

조영곤,박봉석 大韓齒科保存學會 1994 Restorative Dentistry & Endodontics Vol.19 No.1

ONE-STEP 접착제의 상아질 접착에 관한 연구

조영곤,박성택,박광수 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1

The purpose of this study was to oberve the morphologic change of dentinal surface. adhesion in interface between dentin and bonding agents, and penetration pattern of resin tags into dentinal tubles according to bonding procedure of ONE-STEP universal adhesive system. Ten extracted human molars were mounted in dental stone and sectioned to expose midcoronal occlusal dentin and again sectioned tooth drown apically. Specimens were randomly assigned to three groups for dentin conditiong with 32% phoshoric acid. two coats of bonding agents after dentin conditioning, and bond of composite resin. The surface of dentin were treated with etchant and applied bonding agent, and bonded composite resin according to the directions of manufactruer. Specimens which were boned composite were sectioned longitudinally for observing interfaces between in 6 N HCL for 30 second and 1% NaOCL for 12 hours to partially demineralize and deproteinize the dentin substrate. Each specimen was mounted on a brass stub, sputter-coated with gold and observed under SEM. The result were as follows : 1. On the dentinal surface which was conditional with 32% phosphoric acid, the smear layer was completely removed, orifices of dentinal tubules were opened 3-5㎛ wide, and dentinal surface was irregular. 2. On the dentinal surface which was applied ONE-STEP bonding agent, resin particles were observed on the orifices of dentinal tubules and intertubular dentin. 3. There were close adaptation between dentin and resin and were the pattern which composite invaded into dentin. 4. 1-3㎛ wide hybrid layer was visible in the interface between dentin and resin. 5. Long and funnel shaped resin tags were observed in demineralized specimens, and the surfaces of tags were rough.

상아질 접착 후 저장기간에 따른 접착제의 접착력 변화

조영곤,반일환,유미경 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.3

본 연구는 상아질에 2단계와 단일 단계 자가 산부식 접착제를 적용하여 복합레진을 접착한 후 저장기간에 따른 미세 인장 결합강도와 접착계면의 변화를 상호 비교하기 위하여 시행하였다. 발거된 상 ·하악 대구치 48개의 교합면측 상아질을 노출시켜 12개씩 4개의 군으로 분류하였다 사용된 접착제의 종류에 따라 SE Bond 군, AdheSE 군, Adper 군, Xeno III 군으로 분류하여 접착제를 적용한 후, 동일 회사의 복합레진 을 4 mm두께로 접착시켰다. 각 군당 4개의 치아를 선택하여 증류수가 담겨진 용기에 집어넣고 37℃의 항온기에 각각 1일 15일, 30일 동안 저장한 후 시편을 제작하여 각각 미세인장 결합강도의 측정과 주사전자 현미경 관찰 하여 다음과 같은 결과를 나타내었다. 2단계 자가 산부식 접착제는 1일에서 30간의 저장기간 동안 결합강도가 점차적으로 감소하였지만 통계학적으로 유의한 차이를 나타내지 않았고, 상아질과 접착제 간에 긴밀한 접착관계를 보였다. 반면에 단일 단계자가 산부식 접착제는 1일의 저장기간에 비해 30일의 저장기간에서 통계학적인 결합강도의 감소를 나타내었으며, 상아질과 접착제 간에 넓은 간극이 관찰되었다. 따라서 본 연구에서 나타난 두 종류의 30일 동안의 접착내구성은 2단계 자가 산부식 접착제가 단일 단계 자가 산부식 접착제보다 우수한 것으로 나타났다. This study compared the microtensile bond strength (μTBS) and microscopic change of two 2-step and two 1-step self-etching adhesives to dentin according to storage times in distilled water. Occlusal dentin was exposed in 48 human molars. They were divided to four groups by different adhesives: SE Bond group (Clearfil SE Bond), AdheSE group (AdheSE). Adper group (Adper Prompt L-Pop), and Xeno group (Xeno III). Each group was stored in 37℃ distilled water for 1, 15, and 30 days. Resin-bonded specimens were sectioned into beams and subjected to μTBS testing with a crosshead speed of 1 mm/minute. For SEM observation, one specimen was selected and sectioned in each group after each stroage time. Resin-dentin interface was observed under FE-SEM. In all storage times, mean μTBS of SE group was significantly higher than those of other groups (p < 0.05). There was no significant difference between mean μTBS of SE group and AdheSE group among all storage times, but significant difference between 1- and 30-day storage in mean μTBS of Adper group and Xeno group (p > 0.05). For 1-and 15-day storage, all groups showed the close adaptation between resin-dentin interfaces. For 30-day storage, resin-dentin interfaces showed wide gap in Adper group and separate pattern in Xeno III group. Resin-bonded specimens were sectioned into beams and subjected to μTBS testing with a crosshead speed of 1 mm/minute. For SEM observation, one specimen was selected and sectioned in each group after each stroage time. Resin-dentin interface was observed under FE-SEM. In all storage times, mean μTBS of SE group was significantly higher than those of other groups (p < 0.05). There was no significant difference between mean μTBS of SE group and AdheSE group among all storage times, but significant difference between 1- and 30-day storage in mean μTBS of Adper group and Xeno group (p > 0.05). For 1-and 15-day storage, all groups showed the close adaptation between resin-dentin interfaces. For 30-day storage, resin-dentin interfaces showed wide gap in Adper group and separate pattern in Xeno III group.

백악질 변연을 갖는 2급 와동에 충전된 4종 복합레진의 미세누출

조영곤,한세희,김은성 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.6

The purpose of this study was to evaluate four different composite resins in vitro for microleakage in Class II box-type restorations that have gingival margins apical to the cementoenamel junction. Forty caries-free extracted human molars were used in this study. The Class II cavities were prepared 1.0mm below cementoenamel junction with a # 701 carbide bur. The teeth were randomly divided into four groups, each group comprising 20 treated cavities according to adhesives and filing materials ; Group 1 : Scotchbond Multipurpose/z-100, Group 2: Ariston Liner/Ariston pHc, Group 3: One-Step/pyramid, Group 4: Prime & Bond NT/SureFil. To simulate the clinical situation during restoration placement, a restoration template was fabricated and composite resin was filled using a three sited light-curing incremental technique. The specimens were stored in the 100% humidity for 7 days prior to thermocycling. The specimens were immersed in 2% methylene blue dye solution for 24 hours and then embeded in transparent acrylic resin and sectioned mesiodistally with a diamond wheel saw. The degree of marginal leakage was scored under the stereomicroscope(×20) and the data were analyzed by Kruskal-Wallis test and Mann-Whitney test. The results were as follows : 1. Microleakage was minimal in the hybrid composite resin type, Z-100. 2. In the condensable types, Pyramid shows the most microleakage compared to Ariston pHc. And SureFil(p<0.001) . 3. There was no statistically significant difference between Ariston pHc and SureFil(p>0.001). Key words : Microleakage, Cemental margin, Hybride composite resin.

크세논 램프에 노출된 복합레진의 색조변화

조영곤,서정일,김수미,정진호,이영곤 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.3

The purpose of this study was to evaluate the color changes of the composite resin resulting from xenon lamp exposure in different environments. Composite resin (Z 250 ; shade A1, A2, A3.5 and A4) were applied in a cylindrical metal mold. Seventy five specimens according to environments of exposure were made as follows; Group Ⅰ : aluminum foiling of the specimens in the air at 37℃ for 1 day and 7 days. Group Ⅱ : exposure of xenon lamp to the specimens in the air at 37℃ for 1 day and 7 days. Group Ⅲ : exposure of xenon lamp to the specimens in distilled water at 37℃ for 1 day and 7 days. The color characteristics (L^*, a^*, b^*) of the specimens before and after exposure of xenon lamp were measured by spectrophotometer and the total color differences (ΔE^*) were computed. The results obtained were as follows: 1. In all groups except A1 shade of group Ⅲ, the ΔE^* values presented below 2.0, and group Ⅲ showed the highest ΔE^* values followed by group Ⅱ and group Ⅰ in a decreasing order(p<0.05). 2. In all shades and groups, the more the exposure time of xenon lamp and the lighter the shade were, the higher the tendency for discoloration(p<0.05). 3. The composite resins which was exposed to xenon lamp in the distilled water was more discolored than those in the air (p<0.05). 4. The major changes of composite resins which were exposed to xenon lamp in the air were an increase in yellowness through a positive shift of the b^* value, and those in the distilled water were an increase in darkness and yellowness through a negative shift of the L^* value and a positive shift of the b^* value.