• Journal of Periodontal and Implant Science
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• 제38권4호
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• pp.709-716
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• 2008

Purpose: Autogenous transplantation of teeth can be defined as transplantation of teeth from one site to another in the same individual, involving transfer of impacted or erupted teeth into extraction sites or surgically prepared sockets". Successful autogenous transplantation of teeth depends upon a complex variety of factors. Such factors include damage to the periodontal ligament of the donor tooth, residual bone height of the recipient site, extra-oral time of tooth during surgery. Schwartz and Andreasen previously reported that autogenous transplantation of teeth with incomplete root formation demonstrated higher success rate than that of teeth with complete root formation. Gault and Mejare yielded similar rate of successful autogenous transplantation both in teeth with complete root formation and in teeth with incomplete root formation when appropriate cases were selected. This case report was aimed at the clinical and radiographic view in autogenous transplantation of teeth with complete root formation. Materials and Methods: Patients who presented to the department of periodontics, Chonnam National University Hospital underwent autogenous transplantation of teeth. One patient had vertical root fracture in a upper right second molar and upper left third molar was transplanted. And another patient who needed orthodontic treatment had residual root due to caries on upper right first premolar. Upper right premolar was extracted and lower right second premolar was transplanted. Six months later, orthodontic force was applied. Results: 7 months or 11/2 year later, each patient had clinically shallow pocket depth and normal tooth mobility. Root resorption and bone loss were not observed in radiograph and function was maintained successfully. Conclusion: Autogenous transplantation is considered as a predictive procedure when it is performed for the appropriate indication and when maintenance is achieved through regular radiographic taking and follow-up.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.229-230
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• 2017

This study aims to achieve an enhancement in the quality of high strength concrete through a reduction in autogenous shrinkage by supplying the moisture needed for hydration through recycled aggregates that retain high amounts of moisture. The result showed that, moisture supply increased with the higher replacement rate, autogenous shrinkage dropped by up to 60 percent. Also, compressive strength was increased by up to 10 percent.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제33권3호
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• pp.256-263
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• 2011

Purpose: The purpose of this study was to evaluate the effectiveness of autogenous tooth graft materials after maxillary sinus bone grafts. Methods: The study involved 23 implants in 22 patients who visited the Department of Oral and Maxillofacial Surgery and the Department of Periodontics, Chosun University Dental Hospital, in 2008 and received autogenous tooth graft materials for maxillary sinus bone grafts. Results: For eight patients with maxillary bone graft materials prior to implant placement, the healing period averaged five months. For eleven patients with simultaneous maxillary bone graft and implant placement, eight patients received a second surgery, with an average healing time of six months. Three patients had a longer observation period with only a fixture implanted. Three patients who received only a bone graft required more time to implant placement because of the lack of residual bone and also for personal reasons. Only 5 patients had biopsies performed and complications such as infection and dehiscence healed well. The application of autogenous graft materials to the maxillary bone graft sites did not exert any significant effects on the success rates. When a mixture of graft materials was used, the post-surgical bone resorption rate was reduced. Histological analysis showed that new bone formation and remodeling were initiated during the three-to-six month healing period. Bone formation capacity increased continuously up to six months after the maxillary bone graft. Conclusion: According to this analysis, excellent stability and bone-forming capacity were seen in cases where autogenous materials were used alone or mixed with other materials. Autogenous tooth graft materials may be substituted instead of autogenous bones.

• 콘크리트학회논문집
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• 제16권5호
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• pp.621-626
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• 2004

일반 콘크리트뿐만 아니라 고성능콘크리트 제조 시 고로슬래그(BFS)의 사용은 워커빌리티, 장기 강도 및 내구성 측면에서 장점을 갖는다. 그러나 슬래그 콘크리트는 일반 콘크리트에 비해 수축이 크며 특히 자기수축이 크게 발생하기 때문에 적절한 방법으로 제어하지 않으면 심각한 균열을 야기할 수 있다. 따라서 수축에 의한 균열 발생을 최소화하고 콘크리트 구조물의 사용 수명을 확보하기 위해서는 BFS를 함유한 콘크리트의 자기수축 거동에 대한 이해가 요구된다. 본 연구에서는 물-결합재(시멘트+BFS) 비(W/B)가 0.27${\~}$0.42이고 BFS 대체율이 각각 $0\%$, $30\%$, $50\%$인 각주형 콘크리트 시편을 제작하여 자기수축을 측정한 후, 실험결과를 바탕으로 자기수축 예측 모델의 재료 상수 값들을 결정하였다. 또한, 응력 발현에 기여하는 자기수축을 유효자기수축으로 정의하고, 다양한 W/B를 고려한 재령 28일에서의 유효자기수축 변형률 추정식을 제안하였다. 실험결과, W/B가 동일할 때 콘크리트의 자기수축은 BFS의 사용량에 따라 증가하였다. 또한 동일한 양의 BFS를 사용한 경우, W/B가 낮아짐에 따라 자기수축 증가율이 감소하는 경향을 보였다. 따라서 고로슬래그 콘크리트의 자기수축을 줄이기 위해서는 자기수축을 줄이는 수축저감제 등의 혼화 재료를 사용하거나 시공 현장에서의 충분한 습윤양생이 필요하다고 판단된다.

• 콘크리트학회논문집
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• 제21권4호
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• pp.481-488
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• 2009

시멘트페이스트, 모르타르 및 콘크리트의 자기수축의 크기 및 발현율은 초기재령 내부온도의 이력과 크기에 의해 영향을 받는다고 보고된 바 있으나, 초기재령 수화열과 자기수축에 대한 구체적인 관계분석은 아직 미흡한 실정 이다. 이 연구에서는 초기재령 수화온도 및 자기수축의 이력특성에 대한 분석방법을 제시한 선행연구를 기초로, 시험체 크기 및 수화지연 효과에 따른 고강도콘크리트의 초기재령 수화열과 자기수축의 거동특성 및 상관관계를 분석하였다. 또한 자기수축에 의한 균열평가시 유효자기수축의 기준이 되는 응결시간과 수화온도 및 자기수축의 이력과의 관계도 검토하였다. 그 결과, 시험체가 매스화될수록 초기재령 수화발열 상승구간의 수화온도 상승량 및 수화발열 상승속도, 자 기수축 증가구간의 자기수축 증가량 및 자기수축 속도는 증가하는 것으로 나타났으며, 지연제를 사용할 경우 그 값은 감소하는 것으로 나타났다. 초기재령 콘크리트의 수화발열 상승속도가 증가하면 자기수축 속도는 증가하며, 이와 더불 어 재령 91일 자기수축도 증가하는 것으로 나타나, 종국 자기수축은 초기재령 수화발열상승 속도에 의해 영향을 받을 수 있을 것으로 사료된다. 한편, 콘크리트 균열평가시 유효자기수축의 기준이 되는 응결시간과 변곡점 및 수화온도 상 승시점은 시멘트의 수화반응 과정에 있어 서로 밀접한 관계가 있음을 확인할 수 있었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권5호
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• pp.410-417
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• 2006

The present study was aimed to compare the resorption rate and the histological change of the autogenous dermis and the artificial dermis (Terudermis$^{(R)}$) after the transplantation, and to report the clinical results of the use of Terudermis$^{(R)}$ in order to restore the soft tissue defect. Twenty mature rabbits, weighing about 2 kg, were used for the experimental study. The autogenous dermis and the Terudermis$^{(R)}$ size 1${\times}$1 cm were transplanted to the space between the external abdominal oblique muscle and the external abdominal oblique fascia of the each rabbits. They were divided into 4 groups (n=5 each) and gathered at 1, 2, 4, and 8 weeks after the transplantation. The resorption rate was calculated, and H-E stain was preformed to observe the histological changes. The chart review of the 17 patients who received Terudermis$^{(R)}$ graft to the facial soft tissue defects was conducted for the clinical study. The resorption rate at 8 weeks after the transplantation was 21.5% for the autogenous dermis, and 36.4% Terudermis$^{(R)}$. In microscopic examinations, the infiltration of the inflammatory cells and the epidermal inclusion cyst were observed in the autogenous dermis graft. The neovascularization and the progressive growth of the new fibroblast were shown in the Terudermis$^{(R)}$ graft. In clinical data of 17 patients, the size of the grafted Terudermis$^{(R)}$ was from 1.5$cm^2$ to 7.5$cm^2$ (average 3.5$cm^2$). Follow-up ranged from 5 to 25 months. Fourteen patients with cleft palate demonstrated stability of the graft and unremarkable complications. But unstability of the graft and the partial relapse were observed in three patients received the vestibuloplasty. These results indicate that Terudermis$^{(R)}$ can be available substitute of autogenous dermis because of the stability about resorption, the histocompatibility, and the unremarkable clinical complications.

• Archives of Plastic Surgery
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• 제34권6호
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• pp.785-791
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• 2007

Purpose: Paraffin has been used to augment depressed nasal contour for many years by illegally. Reported complications of nasal paraffinoma were skin thinning, displacement of nasal profile, redness, chronic inflammation and malignant change to skin cancer. The current authors report results of the secondary rhinoplasty after excision of nasal paraffinoma. Methods: Through the open rhinoplasty incision, paraffinoma was removed under direct vision. Saline irrigation and meticulous hemostasis were performed. Simultaneously, the secondary depressed nasal deformity was corrected with autogenous dermofat graft harvested from inferior gluteal fold. The dermofat was fixed to the nasofrontal area with bolster suture, and the interdormal area of the tip. Results: A total of 13 patients underwent secondary augmentation with autogenous dermofat graft after removal of paraffinoma from 2000 to 2004. The mean follow-up period was 15 months. There were no postoperative complications. All patients were satisfied with their surgical results. However, there were 10 to 20 percent resorption of the grafted dermofat. Conclusion: It is suggest that autogenous dermofat be one of good materials for the correction of the secondary deformity after removal of nasal paraffinoma. In addition, autogenous dermofat graft presented easy harvesting and manipulation for transfer, high survival rate by firm fixation to the recipient site and stable surgical results.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.57-60
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• 2009

In ultra-high-strength concrete, autogenous shrinkage is larger than dry shrinkage due to the consume of a large amount of cement and cementitous material, and this is a factor deteriorating the quality of structures. Thus, we need a new technology for minimizing the shrinkage strain for ultra-high-strength concrete. So, this paper have prepared super-high-strength concrete with specified mixing design strength of over 150MPa and have evaluated a method of reducing autogenous shrinkage by utilizing expander and shrinkage-reducing agent. According to the results of this study, with regard to the change in length by autogenous shrinkage, an expansion effect was observed until the age of seven days. The expansion effect was higher when the contents of the expander material were higher. In addition, ultra-high-strength concrete showed a shrinkage rate that slowed down with time, and the effect of the addition of expander material on compressive strength was insignificant. That is shown that required more database to be accumulated through experimental research for the shrinkage strain of members.

• Archives of Reconstructive Microsurgery
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• 제7권1호
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• pp.73-79
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• 1998

We carried out 107 replantations of amputated digits since last 1988. Among them, clean Gillotine amputation was 19 digits, mild crush amputation was 51 digits, severe crush amputation was 28 digits and avulsion type amputation was 9 digits. Vein grafts were used on 24 of these cases. The donor site of the vein graft was the volar aspect of the ipsilateral wrist or lower forearm. The average length of the vein graft was 1.8cm(1.0-3.0cm) and the average diameter of the vein graft was 1.5mm(1.0-2.0mm). Sixty-one of 107 digits were successfully replanted for an 57% success rate. The survival rate of the replantation using the vein graft was 66.7%. We analysed the functional results of the successfully replanted digits according to Nakamura and Tamai's criteria. The functional results of the replantated digits using vein graft were better than that of without using vein graft(more than fair results, 81.2% vs 73.3%). We conclude that the jucidious use of autogenous vein grafts in digital replantation surgery will improve the survival rate and promote the functional result.

• Journal of Periodontal and Implant Science
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• 제37권2호
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• pp.151-164
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• 2007

Objective: The sinus floor elevation procedures have been used to facilitate implant placement in the severely atrophic posterior maxilla. Many variables may have an influence on the outcomes of the sinus floor elevation in combination with implant treatment. The aim of this study was to analyze survival rate of implants placed in the edentulous maxillae of patients in whom sinus floor elevation was undertaken according to variables. Materials and Methods: It consisted of 96 patients(50 male and 46 female), ranging in age from 31 to 70 years(mean 49 years), who underwent sinus floor elevation procedure(94 implants in left side and 106 implants in right side) from 2001 to 2002. A total of 200 implants were placed in the grafted sinus(73 implants in lateral approach and 127 implants in crestal approach). All implants were restored by fixed prosthesis. All patients were healthy. Follow-up periods for implants were between 48 to 60 months. Results: The cumulative survival rate of implants was 91.5%. Gender, age and operation site did not have an influence on the survival rate. There was statistically significant differences for the implants which placed in less than 4 or 5 rom residual bone height, the survival rate was 60%, 81.4% respectively (p<0.05). There was no statistically significant difference of implants survival rate ac- cording to approach technique. The survival rate for 100% autogenous bone grafts was lower with respect to composite grafts containing autogenous bone and 100% substitutes. The survival rate for hydroxyapatite-coated implants was statistically significant lower than other textured group (p<0.05). Conclusion: Residual bone height, surface texture and graft materials have an influence on the survival rate. To use autogenous bone as a part of a composite bone replacement, implant texture which leads to more favorable implant-bone interface were necessary. To determine residual bone height for initial implant stability was important.