• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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• pp.584.2-584
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• 2001

The purpose of the present study were to evaluate microleakage of a fourth generation dentin-bonding agent following a walking bleaching treatment, to determine the effect of temporary postbleaching dressing with calcium hydroxide on microleakage and to investigate the effect of delayed intracoronal restoration on micro leakage. Forty extracted non-carious incisors were selected and conventional root canal treatment was performed. The teeth were randomly divided into 4 groups of 10 specimens each.(omitted)

• Restorative Dentistry and Endodontics
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• 제28권1호
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• pp.1-10
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• 2003

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 extract-ed 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). Group 3 and 6 were covered with IRM mixed at P/L ratio(10g/2g). 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(Croup 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 $5^{\circ}C{\;}and{\;}55^{\circ}C$) and immersed in 2 % methylene blue for dye penetration testing. The results were analysed using Kruskal-Wallis Test, Mann-Whitney and Wilcoxon signed 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 10.05) 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).

• 대한치과의사협회지
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• 제36권11호통권354호
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• pp.794-799
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• 1998

Many references report that abnormal diastema except temporary diastema existing in mixed dentition period is caused by maxilary heavy labial frenum, malocclusion, progressive periodontal disease, and loss of posterior teeth. We can diagnose patient as diastema caused by periodontal disease, especially, in case of accompanying progressively destructed anterior maxillary alveolar bone defect, and interseptal bone defect. We report Multiple disciplinary approach for diastema associated with periodontal disease. Periodontal treatment(Guided Tissue -Regeneration, alveoloplasty, bone graft), or thodontic treatment (space closure, redistribution), and the final proshodontic restoration for retention were used.

• 대한두개안면성형외과학회지
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• 제19권4호
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• pp.264-269
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• 2018

Background: Orbital resorbable mesh plates are adequate to use for isolated floor and medial wall fractures with an intact bony buttress, but are not recommended to use for large orbital wall fractures that need load bearing support. The author previously reported an orbital wall restoring surgery that restored the orbital floor to its prior position through the transnasal approach and maintained temporary extraorbital support with a balloon in the maxillary sinus. Extraorbital support could reduce the load applied on the orbital implants in orbital wall restoring surgery and the use of resorbable implants was considered appropriate for the author's orbital wall restoring technique. Methods: A retrospective review was conducted of 31 patients with pure unilateral orbital floor fractures between May 2014 and May 2018. The patients underwent transnasal restoration of the orbital floor through insertion of a resorbable mesh plate and maintenance of temporary balloon support. The surgical results were evaluated by the Hertel scale and a comparison of preoperative and postoperative orbital volume ratio (OVR) values. Results: The OVR decreased significantly, by an average of 6.01% (p<0.05) and the preoperative and postoperative Hertel scale measurements decreased by an average of 0.34 mm with statistical significance (p<0.05). No complications such as buckling or sagging of the implant occurred among the 31 patients. Conclusion: The use of resorbable mesh plate in orbital floor restoration surgery is an effective and safe technique that can reduce implant deformation or complications deriving from the residual permanent implant.

• 구강회복응용과학지
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• 제39권3호
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• pp.158-167
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• 2023

최근 치의학 분야에서 디지털 기술이 발달함에 따라 computer-aided design-computer-aided manufacturing (CAD/CAM)을 이용한 의치 제작 진료 단계의 변화를 가져왔다. CAD/CAM 기술을 이용한 의치 제작 방식은 제작기간과 내원 간격의 단축으로 임상적인 효율성과 편리함을 제공함과 동시에 기공을 단순화하여 오류 발생을 감소시켰다. 본 증례는 복잡한 병력과 신체적 장애를 가진 환자에게 기존의 임시의치를 디지털 방식으로 복제 및 출력하여 개인 트레이로 활용하였고, 부가중합형 실리콘 인상재로 채득한 최종 인상체에는 수직고경과 중심위, 상악 전치부의 각도 및 길이에 대한 정보가 포함되어 있으며 이를 통해 제작 기간과 내원 간격을 단축하여 환자의 만족도를 높일 수 있었다. 최종 의치는 밀링 방식 및 monolithic disc를 이용하여 제작하였고, 적절한 안정과 유지, 지지를 보여 기능적, 심미적으로 만족스러운 결과를 얻을 수 있었다.

• 한국산림과학회지
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• 제110권4호
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• pp.630-647
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• 2021

이 연구에서는 산지관리법에서 규정하고 있는 복구비 산출체계의 문제점과 그 개선방안을 파악하고, 이에 근거한 산지복구 표준모델을 개발하여 최적 복구비 산출체계를 도출하고자 전문가 그룹을 대상으로 델파이조사를 실시하였다. 그 결과, 현행 복구비 산출체계의 문제점으로 '토지이용 유형의 부적정', '산지경사 등급의 부적정', '산지복구 기준공종의 불충분'이 채택되었다. 이러한 문제점의 개선방안으로 토지이용 유형을 ① 산지전용허가·신고지 및 산지일시사용허가지, ② 산지일시사용신고지, ③ 토석채취(매각)·광물채굴허가지, ④ 토사채취허가지로 재편성하는 것, 산지경사 등급을 ① θ<10°, ② 10°≦θ<15°, ③ 15°≦θ<20°, ④ 20°≦θ<25°, ⑤ 25°≦θ<30°, ⑥ θ≧30°으로 세분화하는 것, 기존 17개 기준공종 중 3개 공종이 제외되고 15개 공종이 추가된 22개 기준공종 및 7개 추가공종으로 재편성하는 것이 합의되었다. 이상의 결과에 준하여 개발한 24개 표준모델을 토대로 산출한 복구비는 34,185~607,403천원 범위로 나타났으며, 여기에 추가공종, 할증 또는 할인, 감리비가 적용되면 토석채취(매각)·광물채굴허가지에서 최대 668,143천원에 이르는 것으로 나타났다. 이러한 표준모델에 의한 복구비 분포에 대해서도 전문가들의 의견은 높은 수준에서 합의가 이루어졌다. 이상의 연구결과는 대집행 복구사업의 원활한 수행을 위해 예치되는 복구비의 적정성을 확보하는 데에 기여할 수 있을 것으로 기대한다.

• 구강회복응용과학지
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• 제19권4호
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• pp.317-323
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• 2003

When making crown and bridges on anterior regions, many practitioners consider the esthetics the most. For this reason functional aspect are not considered as much as the esthetics. If the occlusion on the anterior region are not formed correctly, movement of the temporomandibular joint can be disturbed and excessive stress can be occur that pathologic condition can be under lied. On this case presentation will show the importance of the anterior guidance and suggest the appropriate protocol of using customized anterior guide table. A 45years old male had to remake both of the upper central and lateral PFM because of the porcelain fracture. The new PFM crowns were made conventional methods without considering the anterior guidance. After the temporary setting, the patient complained of discomfort and short looking upper anteriors. To solve these problems we had to restore the palatal contour and length of the new crowns by making customized anterior guide table using temporary crowns that contains patient's old anterior guidance. This procedure which is copying the pt's comfortable anterior guidance to the final prosthesis made them to be esthetic and patients to feel comfortable.

• 보존과학회지
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• 제35권1호
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• pp.51-60
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• 2019

This paper provides quantitative data that describes the evolution of the air quality in the Whale and Sea Museum, located in the Iwate prefecture, collected after the 2011 Great East Japan Earthquake and tsunami. The museum was damaged significantly by the disaster, and restoration works continued for over six years. The air quality in the temporary storage facility and museum was monitored during the rehabilitation process. Evaluation of air quality is carried out by gas chromatography- mass spectrometry, ion chromatography and high-performance liquid chromatography. The results showed that the characteristics of the chemical components differed depending on the measurement locations inside the building. The museum atmosphere tended to be alkaline as the airtightness increased because of the maintenance works at the entrance. It was also determined that it was necessary to study the intake/exhaust routes and to clean them according to the contamination degree. In Japan, there are recommended museum air quality standards for acetic acid, formic acid, alkali, and aldehydes. The results indicated that these standards should not be used as a reference for damaged museums. Furthermore, at the temporary storage facilities for to store the collections during the rehabilitation of the museum, solvents such as ethyl benzene, toluene, and xylene are initially abundant, although they can be reduced by ventilation, while other components such as 2E1H was confirmed in this case are likely to remain.

• 구강회복응용과학지
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• 제36권3호
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• pp.168-175
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• 2020

목적: 현재 상용화하여 사용되는 임시 수복물 재료와 새롭게 대두되는 재료들의 기계적 성질을 실험하고, 평가하는 것이다. 연구 재료 및 방법: Polymethyl methacrylate (PMMA) 2종, polyetheretherketone (PEEK), polycarbonate 4군의 고분자 재료들을 평가하였고, 표면 경도, 굴곡강도, 저작 시 마모도, 마모 양상 4가지의 기계적 물성을 실험하였다. 시편의 3축 굽힘 강도와 비커스 경도 테스트는 각각 만능 시험기를 사용하여 측정하였고, 저작 시험기를 이용하여 100,000회의 저작 시험 후 주사 전자 현미경으로 미세구조를 관찰하고 전, 후 무게를 비교하였다. 통계적 유의성 평가를 위해 kruskal wallis test를 시행하였다. 결과: PEEK의 굽힘 강도와 비커스 경도가 가장 높게 나타났으며, PC, PMMA-H, PMMA-T 순으로 나타났다. 미세구조 표면은 PEEK 군에서 거칠기 형태가 가장 적게 나타났으며, PC, PMMA-H, PMMA-T 순으로 적게 나타났다. 결론: PC는 임시치아 제작에 적용할 수 있는 충분한 기계적 성질을 가진 것으로 사료된다. 그러나, 실제 임상 적용을 위해서는 생체 친화성과 같은 추가적인 연구가 필요할 것으로 사료된다.

• Journal of Korean Dental Science
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• 제11권1호
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• pp.14-20
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• 2018

Purpose: The purpose of this study is to measure and compare the removal torques of different cements applied in attachments of zirconia restorations on titanium (Ti) abutments fitted with retrievable cement-type slot (RCS) on the lingual side for the better retrievablity by use of a slot driver. Materials and Methods: Three types of cements were used in the experiment: two permanent cements in $RelyX^{TM}$ U200 (RU) (3M ESPE) which is a resin cement and $FujiCem^{TM}$ (FC) (GC) which is a resin-modified glass ionomer cement, and a temporary cement in $Freegenol^{TM}$ temporary cement (TC) (GC). Measurements of removal torques were conducted as follows; an attached sample was fixed on the equipment customized for the experiment; a slot driver was connected to a MGT12 (Mark-10 Corp.), a torque measurement instrument; the sample had the driver fitted to its RCS and then was rotated until the it was removed; and finally, the maximum torque value was recorded. Result: As for the removal torque measurement results, the average values were $47.9{\pm}2.6Ncm$ for RU, $43.4{\pm}1.5Ncm$ for FC, and $20.9{\pm}1.0Ncm$ for TC. The statistical analysis using Kruskal-Wallis test yielded the significance probability of P<0.05 (P=0.002), which confirmed the presence of significant differences between the three groups. Conclusion: All three cements exhibit clinically acceptable levels of removal torque when applied to an upper zirconia implant restoration fitted with a lingual slot, with RU and FC, the two permanent cements, having the significantly higher values than that of TC, the temporary cement.