• Composites Research
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• 제24권1호
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• pp.31-36
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• 2011

본 연구에서는 유도무기의 탐색기에 적용되는 지존 접착제의 대체 가능성을 조사하기 위해 환경인자의 노출시간에 따른 기존 접착제와 대제 접착제의 접착전단장도들을 평가하고 이들의 화학구조 변화를 조사하였다. 이때 접착제는 기존 접착제와 대체 접착제에 대해 각각 구조용 접착제와 실링용 접착제의 두 종류를 고려하였다. 이들 접착제는 온도, 수분, 자외선 등의 복합적인 환경인자에 최대 1000시간 동안 노출시켰다. 환경인자의 노출시간에 따른 접착제의 접착전단강도를 평가하기 위해 접착전단시험을 수행하고 화학구조 변화를 조사하기 위해 ATR 적외선 분광분석을 수행하였다. 연구결과에 따르면 대체 접착제의 접착전단강도는 기존 접착제의 경우에 비해 높으며 환경인자의 노출에도 매우 안정적으로 나타나 대체 접착제는 기존 접착제의 대체용으로 적용이 가능함을 알 수 있었다.

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

• Restorative Dentistry and Endodontics
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• 제39권3호
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• pp.180-186
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• 2014

Objectives: The purpose of this in vitro study was to evaluate the microleakage and penetration of fissure sealant in permanent molar teeth with fluorosis after pretreatment of the occlusal surface. Materials and Methods: A total of 120 third molars with mild dental fluorosis were randomly divided into 6 groups (n = 20). The tooth surfaces were sealed with an unfilled resin fissure sealant (FS) material. The experimental groups included: 1) phosphoric acid etching (AE) + FS (control); 2) AE + One-Step Plus (OS, Bisco) + FS; 3) bur + AE + FS; 4) bur + AE + OS + FS; 5) Er:YAG laser + AE + FS; and 6) Er:YAG laser + AE + OS + FS. After thermocycling, the teeth were immersed in 0.5% fuchsin and sectioned. Proportions of mircoleakage (PM) and unfilled area (PUA) were measured by digital microscope. Results: Overall, there were significant differences among all groups in the PM (p = 0.00). Group 3 showed the greatest PM, and was significantly different from groups 2 to 6 (p < 0.05). Group 6 showed the lowest PM. Pretreatment with Er:YAG with or without adhesive led to less PM than bur pretreatment. There were no significant differences among groups in PUA. Conclusions: Conventional acid etching provided a similar degree of occlusal seal in teeth with fluorosis compared to those pretreated with a bur or Er:YAG laser. Pretreatment of pits and fissures with Er:YAG in teeth with fluorosis may be an alternative method before fissure sealant application.

• Journal of Biosystems Engineering
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• 제32권2호
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• pp.115-120
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• 2007

The adhesive performance of marine mussel extract was compared with that of the commercial medical adhesives for fastening biotissue (SIS) bandages. Joints bonded with mussel extract showed stronger strength than those bonded with other commercial adhesives. The bonding strength was much improved when the moisture in the Joint was reduced using superporous hydrogel regardless of curing time under humid condition ($37^{\circ}C$ and 91% relative humidity). Water inflow into the SIS joint seemed to degrade the performance of mussel extracts adhesive especially for the joints of short period of curing time. The strength of SIS joints coated with surgical sealant was well maintained after being exposed to water inflow.

• 대한소아치과학회지
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• 제31권3호
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• pp.486-494
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• 2004

본 연구는 all-in-one adhesive를 사용하여 전색하는 술식을 통상적인 탈회 술식 및 single-bottle 결합제를 이용하여 전색하는 술식과 비교하여 법랑질과 전색재 사이의 미세누출의 차이를 알아보고자 하는 것이다. 75개의 제3대구치를 5군으로 나누어 1군을 대조군으로 하여 only Etching(1군), $Adper^{TM}$ Single $Bond^{TM}$(2군), $Adper^{TM}\;Prompt^{TM}$ L-Pop(3군), Ad-bond(4군), One-up bond F(5군)로 처리한 후 전색재 도포 후 열순환을 시 행한 뒤 미세누출도를 검사하여 다음과 같은 결론을 얻었다. 1. All-in-one adhesive를 사용한 3, 4, 5군은 1군에 비해 유의성 있게 높은 평균미세누출도를 보였다(p<0.05). 2. 가장 낮은 평균미세누출도는 2군(0.14)에서 보였고 1군(1.05), 3군(1.65), 4군(2.85), 5군(3.05) 순으로 증가하였다. 3. All-in-one adhesive를 사용한 3, 4, 5군중에서 3군은 4, 5군에 비해 통계적으로 유의성 있게 낮은 평균미세누출 도를 보여주었지만(p<0.05) 1군과 2군에 비해 유의성 있게 높은 평균값을 보여주었다(p<0.05). 4. 4군과 5군 사이의 평균미세누출도는 통계적으로 유의성 있는 차이를 보이지 않았다(p>0.05). 5. 주사전자현미경관찰결과 all-in-one adhesive를 사용한 3, 4, 5군은 1, 2군에 비해 레진돌기가 짧고 불규칙하게 관찰되었다.

• Toxicological Research
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• 제34권1호
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• pp.49-53
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• 2018

Cyclohexanone ($C_6H_{10}O$, CAS No. 108-94-1) is a colorless oily liquid obtained through the oxidation of cyclohexane or dehydrogenation of phenol. It is used in the manufacture of adhesives, sealant chemicals, agricultural chemicals, paint and coating additives, solvent, electrical and electronic products, paints and coatings, photographic supplies, film, photochemicals, and as an intermediate in nylon production. Owing to the lack of information on repeated inhalation toxicity of cyclohexaone, in this study, we aimed to characterize the subacute inhalation toxicity. B6C3F1 mice were exposed to 0, 50, 150, and 250 ppm of cyclohexanone for 6 hr/day, 5 days/week for 4 weeks via whole-body inhalation in accordance with the OECD Test Guideline 412 (subacute inhalation toxicity: 28-day study). Mortality, clinical signs, body weights, food consumption, hematology, serum biochemistry, organ weights, as well as gross and histopathological findings were evaluated between the control and exposure groups. No mortality or remarkable clinical signs were observed during the study. No adverse effects on body weight, food consumption, hematology, serum biochemistry, and organ weights, gross or histopathological lesions were observed in any male or female mice in any of the exposure groups, although some statistically significant changes were observed in organ weights. We concluded that no observable adverse effect level (NOAEL) is above 250 ppm in mice exposed to cyclohexanone for 6 hr/day for 5 days/week.

• 대한치과교정학회지
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• 제27권5호
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• pp.781-789
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• 1997

본 연구는 교정치료를 위해 최근에 발거된 소구치 65개를 대상으로 발거직후 부착된 이물질을 제거하고 생리식염수에 담구어 보관한 후 법랑질을 퍼미스 및 $38\%$ 인산으로 표면 처리하고 불소가 유리되는 교정용 전색제로는 광중합형 FluoroBond, 광중합 접착제로는 Transbond, 화학중합 접착제로는 Mono-Lok 2를 선정하여 1차 부착 및 재부착시의 전단결합강도를 만능강도시험기로 측정함으로서, 치아우식 예방 및 진행 억제효과를 지닌 불소가 유리되는 교정용 전색제가 광중합형 및 화학중합형 교정용 접착제의 전단결합강도에 미치는 영향과 재부착에 의한 전단결합강도의 변화를 규명하고, 광중합형 접착제와 화학중합형 접착제 사이의 전단결합강도를 비교하여 다음의 결론을 얻었다. 1. 1차부착에 의한 전단결합강도의 크기는 Mono-Lok2군(11.84MPa), Trans bond군(10.75MPa), Light cured FluoroBond+Mono-Lok 2군(9.69MPa), Light cured FluoroBond+Transbond군(9.39MPa)순이었다. 2. 재부착에 의한 전단결합강도의 크기는 Transbond군(7.40MPa), Light cured FluoroBond+Transbond군(6.48MPa), Mono-Lok 2군(5.89MPa), Light cured FluoroBond+Mono-Lok 2군(5.15MPa)순이었다. 3. 불소가 유리되는 교정용 전색제를 적용한군과 적용하지 않은 군 모두에서 화학중합형 접착제가 광중합형 접착제보다 높은 전단결합강도를 보였으나 통계학적으로 유의한 차이는 없었다(p>0.05). 4. 불소가 유리되는 교정용 전색제를 적용한군과 적용하지 않은 군 모두에서 재부착된 광중합형 접착제가 재부착된 화학중합형 접착제보다 높은 전단결합강도를 보였으나 통계학적으로 유의한 차이는없었다(p>0.05). 5. 1차 부착된 군에 비해 재부착된 모든 군에서 전단결합강도가 현저하게 감소되었으며, 통계학적으로 유의한 차이를 보였다(p<0.05 p<0.001). 이상의 결론을 종합해볼 때 임상적으로 브라켓의 전단결합강도에 경향을 미치지 않는 불소가 유리되는 교정용 전색제를 치아 협면에 적용하여 불소의 유리에 의한 치아우식 예방 및 억제효과를 기대하는 것이 필요할 것으로 생각된다.