• 대한소아치과학회지
• /
• 제29권2호
• /
• pp.255-261
• /
• 2002

유동성 복합레진은 치면 열구 전색이나 작은 교합면 우식의 예방적 레진 수복 및 깊은 와동의 이장재로 사용할 수 있으나 이에 대한 임상적 연구는 부족한 실정이다. 본 연구는 유동성 복합레진이 치면 열구 전색, 예방적 레진 수복, 깊은 와동의 이장의 세 가지 임상적 용도로 적용될 경우, 기존의 재료와 비교한 대체가능성과 타당성을 검토할 목적으로, 각 용도에서의 양재료들이 나타내는 미세누출 양상을 비교분석하였다. 교합면이 건전한 120개의 발거된 대구치를 6개의 군으로 나누어 각 군당 20개색 시편을 구성하였다. 제 1군과 2군에는 각각 Concise와 Tetric flow로 치면 열구 전색을, 제 3군에는 Z-100과 Concise, 제 4군에는 Tetric flow로 예방적 레진 수복을 시행하였으며, 제 5군에는 Vitrebond, 제 6군에는 Tetric flow를 이장재로 이용하여 sandwich technique 수복을 시행하였다. 100회의 열 순환 및 색소 침투후 색소 침투 정도를 관찰하고 미세누출 정도를 판단하여 비교, 분석한 결과 다음과 같은 결론을 얻었다. 1. 열구 전색재인 Concise와 유동성 복합레진인 Tetric flow로 각각 치면 열구 전색을 시행한 경우 미세누출의 차이가 나타나지 않았다(p>0.05). 2. 복합레진인 Z-100과 열구전색재인 Concise로 예방적 레진 수복을 시행한 군과 유동성 복합레진인 Tetric flow 단일 재료로 수복한 군 간에도 미세누출의 차이는 없었다(p>0.05). 3. 이장재로 Resin-modified glass ionomer cement 인 Vitrebond와 유동성 복합레진인 Tetric flow를 사용하여 sandwich technique으로 복합레진 수복을 시행한 경우에도 양 군간에 미세누출의 차이는 나타나지 않았다(p>0.05).

• Restorative Dentistry and Endodontics
• /
• 제26권1호
• /
• pp.64-76
• /
• 2001

Despite the improvements in bond strengths of dentin adhesives and resin-modified glass ionomers, the marginal seal of cervical restorations remains a concern. Microleakage at poorly sealed margins can result in staining, post-operative sensitivity, pulpal irritation, and recurrent caries. The objective of this study was to evaluate the effect of surface penetrating sealant(SPS) on the microleakage of cervical restorations. 45 extracted human teeth were selected, and Class V preparations were prepared on the both buccal and lingual surface of the teeth to the following dimensions : 1.5mm axially, 3mm mesiodistally, and 3mm incisogingivally. After cervical restoration with composite resin, compomer, glass ionomer each restoration was treated as three methods: No Tx., Scotchbond Multipurpose Adhesive$^{\circledR}$, Fortify$^{\circledR}$. The sections were examined with a stereomicroscope to determine the extent of microleakage at enamel and dentin margins. The results of this study were as follows. 1. All groups showed some microleakage. 2. Gingival cavity wall with cementum margin showed significantly higher leakage value than occlusal cavity wall with enamel margin. 3. The group treated with SPS showed significantly lower leakage value than no treated group(p<0.05). But there is no difference between Fortify$^{\circledR}$ and Scotchbond Multipurpose adhesive$^{\circledR}$. The results of this study suggest that SPS are effective in reducing microleakage of class V restorations. But it is certain that some microleakage still occurred despite the application of SPS.

• 대한치과보존학회:학술대회논문집
• /
• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
• /
• pp.558.2-558
• /
• 2001

The aims of this study are (1) to investigate the relation of irradiation mode, polymerization shrinkage and degree of cure of composite resin and(2) it effect on micorleakage of class V restorations. VIP(BISCO Dental Products, Schaumburg, IL, USA) and Optilux 501 (Demetron/Kerr, Danbury, CT, USA) curing lights were used for curing Z-250 composite resin following irradiation mode: VIP 200㎽d, VIP 400㎽, VIP 600㎽, pulse-delay(200㎽ 3sec, 5min wait, 600㎽ 30sec), Optilux R mode.(omitted)

• 대한치과보존학회:학술대회논문집
• /
• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
• /
• pp.555-555
• /
• 2001

The aims of this study are (1) to investigate the relation of irradiation mode, polymerzition shrinkage and degree of cure of composite resin and (2) it effect on microliakage of calss V restorations. VIP(BISCO Dental Products, Schaumburg, IL, USA) and Optilux 501(Demetron/Kerr, Danbury, CT, USA) curing lights were used for curing Z-250 composite resin following irradiation mode: VIP 200㎽, VIP 400㎽, VIP 600㎽, pulse-delay(200㎽ 3sec, 5min wait, 600㎽ 30sec), Optilux C mode, Optilux R mode.(omitted)

• Restorative Dentistry and Endodontics
• /
• 제30권5호
• /
• pp.355-362
• /
• 2005

본 연구는 복합레진을 광조사하기 전과 광조사한 후에 표면 전색제인 Biscover를 적용하여 이들에 대한 변연 미세누출을 평가하고, 또한 표면 전색제를 적용하지 않는 복합레진 수복물과의 미세누출 차이를 비교하기 위하여 시행하였다. 30개의 발거된 대구치의 협면 치경부에 5급 와동을 형성하여 다음과 같이 3개의 군으로 분류하였다; 대조군은 복합레진 표면에 Biscover를 적용하지 않은 군, 1군은 복합레진을 광조사하고 마무리한 후 Biscover를 적용한 군, 2군은 복합레진을 광조사하지 않고 Biscover를 적용한 군. 각 군의 시편은 실온의 증류수에 48시간 동안 보관한 후 $5^{\circ}C$와 $55^{\circ}C$에서 1,000회의 열 순환을 시행하고 2% methylene blue용액에 4시간 동안 침적시켰다. 20배율의 광학 입체현미경 하에서 각 군의 교합면측과 치은측 변연의 색소침투 정도를 관찰하여 미세누출 점수를 얻은후, 각군 간의 유의성을 검정하여 다음과 같은 결과를 얻었다. 1. 2군은 1군보다 교합면측과 치은측 변연 모두에서 높은 미세누출을 보였으나 통계학적으로 유의한 차이는 없었다 (p > 0.05). 2. 대조군은 교합면측 변연에서 1군과 2군보다 약간 높은 미세누출을 보였으며 , 치은측 변연에서 1군보다 약간 높게 그리고 2군과 비슷한 미세누출을 보였다 (p > 0.05). 3. 대조군과 2군은 교합면측 보다 치은측 변연에서 통계학적으로 높은 미세누출을 보였으며 (p < 0.05), 1군은 교합면측과 치은측의 변연 미세누출 간에 통계학적인 차이를 나타내지 않았다 (p > 0.05). 본 연구를 종합하면, Biscover는 중합된 복합레진 표면에 적용할 경우 치은측 변연의 미세누출을 감소시키는데 효과적이었다.

• Restorative Dentistry and Endodontics
• /
• 제26권2호
• /
• pp.180-187
• /
• 2001

The structure of current guides is largely illogical and without any rational use of color ordering. The shade guides are generally made of plastic (rather than the actual composite material) and do not accurately depict the true shade. translucency. or opacity of the composite resin after polymerization. To solve this problem, information based on evaluations of natural teeth and material that use the same method and experimental conditions is necessary. The present investigation measured the color of natural maxillary anterior teeth in vivo and compared the results with those of composite resins. 269 Korean subjects were selected for this study. Intact central incisor. lateral incisor. and canine were selected. The clinical crowns were free of caries or restorations. The middle site of the coronal portion on the labial surface of the tooth was measured by Chroma Meter. The five light activated. resin-based materials (Amelogen, Denfil, Elitefil, Spectrum, Z100) were used in this study. Resin composite was condensed into plastic mold with a diameter of 8mm and a thickness of 4mm. pressed between glass plates to flatten the surfaces. and polymerized using a Visilux II visible light activation unit. The surfaces were polished sequentially on wet sandpaper. Color measurements of each specimen were accomplished by Chroma Meter. A computer program that compares each tooth color with each composite resin color was written and the minimum CIELAB color difference ($\Delta$E$^*$) between tooth and each material was calculated. Under the conditions of this study: 1. Teeth tend to become darker with advancing age. 2. Canines were darker. more yellow. and less green than incisors. 3. The teeth from the women were lighter. more green. and less yellow than the male teeth. 4. In general. composite resins were lighter. more green. and less yellow than teeth. Deficiencies were noted in Hues in YR range. 5. Mean color differences between the five composite resin products and teeth were detectable to the naked eye($\Delta$E$^*$>1.0). 6. In comparing the mean $\Delta$E$^*$ values of materials. Spectrum showed the least followed by Z100, Elitefil, Amelogen, Denfil in increasing order.

• Restorative Dentistry and Endodontics
• /
• 제25권3호
• /
• pp.313-320
• /
• 2000

The purpose of this study was to evaluate on the interfacial morphology between dentin and restorative materials. In this in vitro study, the cavity wall restorated with 3 different kinds of tooth colored restorative materials [resin-modified Glass Ionomer cement (Fuji II LC), composite resin (Z-100), compomer (Dyract)]. The thirty extracted human molar teeth without caries and/or restorations are used. The experimental teeth were randomly divided into three groups of ten teeth each. In each group, Wedge shaped cavities (width: 3mm, length: 2mm, depth: 1.5mm) were prepared at the cementoenamel junction on buccal and lingual surfaces. The adhesive of composite resin were mixed with rhodamine B. Primer of composite resin, Prime & Bond 2.1 of Dyract and liquid of Fuji II LC were mixed with fluorescein. In group 1, the cavity wall was treatment with dentin conditioner, and then restorated with Fuji II LC. In group 2, the cavity wall was treatment with Prime & Bond 2.1 and then restorated with Dyract. In group 3, the cavity wall was etching with 10% maleic acid, applied with primer and bonding agent and then restorated with Z-100. The interface between dentin and restorative materials was observed by fluoresence imaging with a confocal laser scanning microscope. The results were as follows : 1. In Glass ionomer group, adaptation of resin modified Glass-ionomer restoration against cavity wall is tight, but the crack formed inside of restoration were observed. 2. In Dyract group, the penetration of resin tag is shorter and the width of hybrid layer is narrower than composite resin group. 3. In Z-100 group, primer penetrated deeply through dentinal tubule. Also bonding agent was penetrated along the primer, but the penetration length is shorter than primer part, and in 3-D image, the resin tag is conical shape and lateral branch is observed.

• Restorative Dentistry and Endodontics
• /
• 제43권2호
• /
• pp.22.1-22.9
• /
• 2018

Objectives: To evaluate and compare light-transmittance in dental tissues and dental composite restorations using the incremental double-layer technique with varying layer thickness. Materials and Methods: B1-colored natural teeth slabs were compared to dental restoration build-ups with A2D and B1E-colored nanofilled, supra-nanofilled, microfilled, and microhybrid composites. The enamel layer varied from 0.3, 0.5, or 1.2 mm thick, and the dentin layer was varied to provide a standardized 3.7 mm overall sample thickness (n = 10). All increments were light-cured to $16J/cm^2$ with a multi-wave LED (Valo, Ultradent). Using a spectrophotometer, the samples were irradiated by an RGB laser beam. A voltmeter recorded the light output signal to calculate the light-transmittance through the specimens. The data were analyzed using 1-way analysis of variance followed by the post hoc Tukey's test (p = 0.05). Results: Mean light-transmittance observed at thicker final layers of enamel were significantly lower than those observed at thinner final layers. Within 1.2 mm final enamel resin layer (FERL) thickness, all composites were similar to the dental tissues, with exception of the nanofilled composite. However, within 0.5 mm FERL thickness, only the suprananofilled composite showed no difference from the dental tissues. Within 0.3 mm FERL thickness, none of the composites were similar to the dental tissues. Conclusions: The supra-nanofilled composite had the most similar light-transmittance pattern when compared to the natural teeth. However, for other composites, thicker FERL have a greater chance to match the light-transmittance of natural dental tissues.

• Restorative Dentistry and Endodontics
• /
• 제17권1호
• /
• pp.191-205
• /
• 1992

The purpose of this study was to evaluate the microleakage of class II composite resin inlays and compare them with the conventional light-cured resin filling restorations. Class II cavities were prepared in 60 extracted human molars with which cervical margins were located below 1.0mm at the cemento-enamel junction using No. 701 tapered fissure carbide bur. All of the prepared cavities were restored as follows and divided into 6 groups. Group I and 2 were restored using direct filling technique and group 3,4,5 and 6 were restored using direct inlay technique that was cemented with dual-cured resin cements. group I: Cavities were restored with light-curing composite resin, Brilliant Lux. group 2. Cavities were restored with light-curing composite resin, Clearfil PhotoPosterior. group 3: Cavities were restored with Clearfil CR Inlay and heat treated at $125^{\circ}C$ for 7 minutes. group 4: Cavities were restored with same material as group 3 and heat treated at $100^{\circ}C$ for 15 minutes. group 5: Cavities were restored with Brilliant (Indirect esthetic system) and heat treated at $125^{\circ}C$ for 7 minutes. group 6: Cavities were restored with same material as group 5 and heat treated at $100^{\circ}C$ for 15 minutes. All specimens were polished with same method and thermocycled between $6^{\circ}C$ and $60^{\circ}C$, then immersed in a bath of 2.0% aqueous solution of basic fuchsin dye for 24 hours. Dyed specimens were sectioned longitudinally and dye penetration degree was read on a scale of 0 to 4 by Tani and Buonocore's method 45). The results were as follows: 1. Microleakage was observed rather at the cervical margins than at the occlusal margins in all groups. 2. Composite resin inlay groups showed significantly less leakage than direct filling groups at the cervical margins (p < 0.001). 3. In composite resin inlay groups, there was no significant difference in microleakage between specimens by heat treating temperature and time (p > 0.05). 4. There was no significant difference in leakage between each groups at the occlusal margins (p > 0.05).

• Restorative Dentistry and Endodontics
• /
• 제35권2호
• /
• pp.116-124
• /
• 2010

본 연구에서는 복합 레진을 이용한 2급/5급 와동의 직접수복에 있어서 치과의사의 성별에 따른 술식의 차이를 비교하였다. 2008년 대한치과의사협회에 등록된 치과의사 12,193명을 대상으로 이 메일을 통한 설문조사를 실시하였다. 이 메일 수신이 확인된 2,632명 중 840명이 응답하였으며 응답자의 남녀 비율은(남 78.9%, 여 21.1%) 전체 치과의사의 남녀 비율과 유의한 차이를 보이지 않았다(p > 0.05). Chi-square test 와 multiple logistic regression analysis 를 이용하여 남녀간 술식의 차 이를 검증하였다. 2급 와동 수복에서 여자치과의사는 4회 이상의 적층 분할 수복을 하는 경향이 남자치과의사에 비해 1.87배 높았으며, 술식 당 30분 이상 소요하는 경향은 2.72배 높았다(p < 0.05). 5급 와동 수복에서 여자치과의사는 베이스를 사용하는 경향이 1.83배 높았으며, 술식 당 20분 이상 소요하는 경향은 1.63배 높았다(p < 0.05). 본 설문조사에 따르면 남녀 성별에 따라 복합 레진 수복 술식의 차이가 존재하는 것으로 나타났다.