• Journal of Periodontal and Implant Science
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• 제39권3호
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• pp.311-320
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• 2009

Purpose: The aim of the present study was to analyze 7-year cumulative survival rate (CSR, %) of dental implants in the controlled diabetic patients and to evaluate the influence of the position, diameter and length of fixture, bone quality, age, gender and the method of maxillary sinus elevation on the survival rate. Methods: The data of 342 placed implants in the 104 diabetic patients collected between 1995 and 2007 at the Department of Periodontology in Yonsei University Hospital were analyzed. Results: Seven-year CSR of the 342 dental implants in the 104 controlled diabetic patients was 96.5%. The survival rates of the placed implants according the position have no statistically significant difference. The survival rates according to the length or diameter of the fixtures have no statistically significant difference. The survival rates according to the bone quality were 100% (Type I), 97.1% (Type II), 97.7% (Type III) and 85.7%(Type IV). The difference between the survival rate of Type I, II and III and that of Type IV was statistically significant. The survival rates according to patient gender were 96.8% (male), 95.5% (female). The survival rates according to patient age were 100% (${\leq}59$), 93.8% (${\geq}60$). The survival rates according to the method of sinus elevation in the maxillary posterior area were 96.8% (without sinus elevation), 92.9% (lateral approach) and 89.8% (crestal approach). Conclusions: Dental implants can be used successfully in the controlled diabetic patients. In case of upper posterior region which has poor bone density and older patients, the implant treatment should be more properly planed, executed, and followed-up.

• 구강회복응용과학지
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• 제27권1호
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• pp.25-39
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• 2011

마그네슘 양극산화 임플란트는 동물실험에서 우수한 골반응을 나타내었지만 이에 대한 임상 연구는 전무하다. 본 연구에서는 마그네슘 양극산화 임플란트의 단기간 성공률 및 안정성, 변연골 흡수량을 평가하고자 하였다. 강릉원주대학교 치과병원의 임상시험위원회의 승인을 거쳐 건강한 부분 무치악 환자에게 마그네슘 양극산화 임플란트를 식립한 후 일반적인 프로토콜에 따라 보철 치료를 시행하였다. 1차 수술, 2차 수술, 보철물 시적, 하중 후 1개월, 3개월, 6개월 평가를 시행하였으며, 매회 내원 시 임플란트 안정지수(Implant stability quotient, ISQ)를 측정하고 구내 치근단 방사선 사진에서 변연골 흡수량을 산출하였다. 반복측정이 있는 분산분석법을 이용하여 통계적 분석을 시행하였다. 총 50명에게 식립된 101개의 임플란트 중 골유착에 실패한 임플란트는 없었으며, 하중 후 6개월 성공률은 100%였다. 평균 ISQ는 시간이 경과함에 따라 증가하였으며 여성보다 남성에서, 상악보다 하악에서 높게 나타났다 (P<.05). 하중 6개월 후 골질이 양호할수록, 고정체 직경이 클수록 높은 ISQ 값을 보였다 (P<.05). 하중 후 6개월간 평균 변연골 흡수량은 0.26 mm로 관찰되었으며 하악보다 상악에서, 여성보다 남성에서 더 많은 흡수가 관찰되었다. 본 연구의 마그네슘 양극산화 임플란트의 6개월 성공률은 100%이며, 낮은 골질에서도 우수한 골유착이 관찰되었다. 안정성과 변연골 수준 또한 만족스러운 결과를 보였지만 더욱 장기적인 임상연구가 필요하다고 사료된다.

• The Journal of Advanced Prosthodontics
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• 제10권4호
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• pp.279-285
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• 2018

PURPOSE. The aim of this clinical study was to assess the accuracy of the implants placed using a universal digital surgical guide. MATERIALS AND METHODS. Among 17 patients, 28 posterior implants were included in this study. The digital image of the soft tissue acquired from cast scan and hard tissue from CBCT have been superimposed and planned the location, length, diameter of the implant fixture. Then digital surgical guides were created using 3D printer. Each of angle deviations, coronal, apical, depth deviations of planned and actually placed implants were calculated using CBCT scans and casts. To compare implant positioning errors by CBCT scans and plaster casts, data were analyzed with independent samples t-test. RESULTS. The results of the implant positioning errors calculated by CBCT and casts were as follows. The means for CBCT analyses were: angle deviation: $4.74{\pm}2.06^{\circ}$, coronal deviation: $1.37{\pm}0.80mm$, and apical deviation: $1.77{\pm}0.86mm$. The means for cast analyses were: angle deviation: $2.43{\pm}1.13^{\circ}$, coronal deviation: $0.82{\pm}0.44mm$, apical deviation: $1.19{\pm}0.46mm$, and depth deviation: $0.03{\pm}0.65mm$. There were statistically significant differences between the deviations of CBCT scans and cast. CONCLUSION. The model analysis showed lower deviation value comparing the CBCT analysis. The angle and length deviation value of the universal digital guide stent were accepted clinically.

• 대한치과보철학회지
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• 제44권5호
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• pp.526-536
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• 2006

Statement of problem : Use of fiber composite technology as well as development of nonmetal implant prosthesis solved many problems due to metal alloy substructure such as corrosion. toxicity, difficult casting, expensiveness and esthetic limit. After clinical and laboratory test, we could find out that fiber-reinforced composite prostheses have good mechanical properties and FRC can make metal-free implant prostheses successful. Purpose : The purpose of this study is to evaluate the flexural strength of implant fixed prosthesis using fiber reinforced composite. Material and methods : 2-implant fixture were placed in second premolar and second molar area in edentulous mandibular model, and their abutments were placed, and bridge prostheses using gold, PFG, Tescera, and Targis Vectris were fabricated. Tescera was made in 5 different designs with different supplements. Group I was composed by 3 bars with diameter 1.0mm and 5 meshes, 2 bars and 5 meshes for Group II, 1 bar and 5 meshes for Group III, and only 5 meshes were used for Group IV. And Group V is composed by only 3 bars. Resin (Tescera) facing was made to buccal part of pontic of gold bridge. All of gold and PFG bridges were made on one model, 5 Targis Vectris bridges were also made on one model, and 25 Tescera bridges were. made on 3 models. Each bridge was attached to the test model by temporary cement and shallow depression was formed near central fossa of the bridge pontic to let 5 mm metal ball not move. Flexual strength was marked in graph by INSTRON. Results : The results of the study are as follows. The initial crack strength was the highest on PFG. and in order of gold bridge Tescera I, Tescera II, Targis vectris, Tescera IV, Tescera III, and Tescera V. The maximum strength was the highest on gold bridge, and in order of PFG, Tescera I, Tescera IV Tescera II, Targis vectris, Tescera III, and Tescera V. Conculsions : The following conclusions were drawn from the results of this study. 1. Flextural strength of implant prosthesis using fiber reinforced composite was higher than average posterior occlusal force. 2. In initial crack strength, Tescera I was stronger than Tescera V, and weaker than PFG. 3. Kinds and number of auxillary components had an effect on maximum strength, and maximum strength was increased as number of auxillary components increased. 4 Maximum strength of Tescera I was higher than Targis vectris, and lower than PFG.

• 대한치과보철학회지
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• 제47권1호
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• pp.12-20
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• 2009

연구목적: 임플란트가 식립되어질 때 매식체는 조직액과 접촉하게 된다. 임플란트의 조직액 흡착은 표면처리에 따라 다양하게 나타난다. 이 때 임플란트 시편의 표면 거칠기와 젖음성과의 상관관계를 분석하고자 하였다. 연구재료 및 방법: 표면 거칠기와 젖음성의 상관관계를 측정하기 위해 네 종류의 임플란트 시편을 각각 5종류 만들었다. 각각의 그룹은 그룹 A: Machined Surface, 그룹 B: Anodized surface, 그룹 C: RBM (HA blasting) surface, 그룹 D: CMP (calcium methaphosphate) coating surface이다. 연구결과: 1. 표면의 거칠기는 RBM, CMP, Anodized, Machined 그룹 순서로 거칠었다. RBM과 CMP는 통계적으로 유의차가 없었다 (P<.05). 2. 젖음성은 Anodized, RBM, CMP, Machined 그룹 순서로 높았다. CMP와 Machined는 통계적으로 유의차가 없었다 (P<.05). 3. 표면 거칠기와 젖음성과의 상관관계는 없었다.

• 대한치과보철학회지
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• 제61권2호
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• pp.101-112
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• 2023

목적: 구치부 단일 임플란트에서 임플란트의 직경과 길이, 식립 위치에 따른 생존율 및 각각의 합병증의 발생률을 후향적으로 조사하는 것이다. 대상 및 방법: 본 연구는 2014년 2월부터 2018년 5월까지 원광대학교 대전치과병원 보철과에서 3명의 보철전문의에게 구치부 단일 치관으로 임플란트 보철 수복을 완료한 환자를 대상으로 하였다. 총 505명의 환자에서 697개의 임플란트를 추적 관찰하였다. 대상 환자의 전자 진료기록부와 방사선 사진을 통해 임플란트의 생존 여부 및 합병증을 기록하였으며 이에 영향을 미칠 수 있는 요인으로 고정체의 직경과 길이, 식립 위치 그리고 환자의 성별, 연령이 평가되었다. 결과: 생존율은 구치부 단일 임플란트의 3년 누적 생존율은 98.5%, 5년 누적 생존율은 94.4% 이었다. 5년 누적 생존율은 직경 4.0 mm 이하(89.5%)일 때보다 4.0 mm 초과(97.0%)일 때 더 높았고, 남성(92.4%)보다 여성(98.8%)에서 더 높았다. 이는 통계적으로 유의한 차이가 있었다 (P < .05). 구치부 단일 임플란트의 기계적 합병증은 20.1%, 생물학적 합병증은 4.7% 발생하였다. 합병증은 지대주 나사 풀림(7.5%), 보철물 탈락(6.3%), 인접면 접촉 상실(3.7%) 순으로 많이 발생하였다. 지대주 나사 풀림은 하악 대구치 부위(10.5%)에서 가장 많이 발생하였고 여성(5.1%)보다 남성(9.5%)에서, 65세 이상(5.1%)보다 65세 미만의 환자(9.4%)에서 더 많이 발생하였다. 이는 통계적으로 유의한 차이가 있었다 (P < .05). 결론: 구치부 단일 임플란트의 5년 누적 생존율은 고정체의 직경이 4.0 mm 이하일 때보다 4.0 mm 초과일 때, 남성보다 여성에서 더 높았다. 가장 많이 발생한 합병증인 지대주 나사 풀림은 하악 대구치 부위에서 가장 많이 발생하였고, 여성보다 남성에서, 65세 이상보다 65세 미만의 환자에서 더 많이 발생하였다. 이는 통계적으로 유의한 차이가 있었다.

• 대한치과보철학회지
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• 제39권2호
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• pp.125-145
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• 2001

To compare the stress distribution patterns between cement-retained and screw-retained implant supported fixed prostheses according to four different abutment types, a three dimensional finite element analysis was performed. The hypothetical three unit fixed partial denture case was modelled on the three implants(10mm length and 3.75 diameter) in mandibular bone. Four angles of implantation(vertical, 10, 15 and 20 degree inclined mesially) were created and three different directions of force (vertical, oblique, horizontal) were applied at the center of the second premolar and distal end of the first molar for each cases. Within the limits of this study, the results were as follows, 1. In vertically installed cases, the more stress was concentrated at upper components, but mesially inclined cases, the more stress was concentrated at cortical bone. 2, The more inclined mesially the more stress was observed, especially at cortical bone. 3. The cement-retained models showed lower principal stress and more even stress distribution than the screw-retained models. 4. The similar stress distribution pattern was showed in model 1 and model 2, model 3 and model 4. 5. The more stress was observed when the loads were applied at the distal end of 1st molar than the center of 2nd premolar. 6 The fixture and the model as a whole, lesser stress values were observed when vertical loads were applied as compared to horizontal and oblique loads.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제33권1호
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• pp.28-39
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• 2007

The purpose of this study is to evaluate the regenerative capacity of reconstruction in the atrophied posterior maxilla by comparing bone graft procedures and alveolar distraction osteogenesis (ADO) techniques. We performed the autogenous iliac bone graft (AGB group, 5 specimens in 3 patients), and the combination (Mixed group, 3 specimens in 3 patients) of the autogenous and deproteinized bovine bone ($Bio-Oss^{(R)}$, Geistlich Co., Switzerland) as the ratio of 2:1 in the sinus floor elevation procedures. ADO procedures using $TRACK^{(R)}$ (KLS Martin Co., Germany) were also performed to augment vertical alveolar height in atrophied posterior maxilla (ADO group, 5 specimens in 4 patients). Newly generated bone tissues were obtained with the 2.0mm diameter trephine bur (3i Co., USA) during implant fixture installation after 5-7 months. Routine histolomorphological observation, immunodot blot assay for quantitative evaluation, and immunohistochemical staining with antibodies to MMP-1, -9, -10, TIMP-1, -2, and BMP-2, -4 were all carried out. Lamellar bone formation was well shown in all specimens and new bone formations of ADO group increased than those of other procedures. In immunohistochemical staining, the strong expression of BMP-2 was shown in all specimens, and immunodot blot assay showed that bone formation is accompanied by the good induction of factors associated with angiogenesis and appeared more increased amount of osteogenic and angiogenic factors in ADO group. ADO is the most effective technique for new bone formation compared to sinus floor elevation with autogenous or mixed bone graft in the atrophied posterior maxilla. In the quantitative immunodot blot assay, the regenerated bone after ADO showed more increased products of VEGF, BMP-2, PCNA and MMP-1 than those after the other procedures, and these findings were able to be confirmed by immunohistochemical stainings.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제29권6호
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• pp.397-406
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• 2003

The purpose of this study was to observe the titanium implant osseointegration in the osteoporosis-induced animal model. Seventy rats, 11 weeks of age, were divided into two groups : an ovariectomized group and a control group. Titanium screw implants(diameter, 2.0mm; length, 3.5mm) were placed into left tibias of 70 rats, 35 in the control group and 35 in the experimental group. The rats were sacrificed at different time interval (1, 2, 3, 4, 6, 8, and 12 weeks after implantation) for histopathologic observation, histomorphometric analysis and immunohistochemistry with fibronectin and CD34 antibody. The results obtained from this study were as follows: 1. Histopathologically findings, newly formed bone was seen at 3 weeks and became lamellar bone at 8 weeks, and mature trabecullar bone was seen at 12 weeks control group. In experimental group, thickness of regenerated bone increased till 8 weeks gradually and mature trabecullar bone was seen at 12 weeks. 2. By histomorphometric analysis, marrow bone density and contact ratio of marrow bone to implant decreased significantly from 8 to 12 weeks in experimental group compared to control group and also total bone to implant contact ratio decreased significantly from 8 to 12 weeks in experimental group. 3. Fibronectin immunoreactivity was strong at 3 weeks control group and reduced after 8weeks gradually. But it was continuously strong from 3 to 8 weeks in experimental group. 4. CD34 immunoreactivity was very strong in the newly formed osteoblasts from 3 to 8 weeks control group. But it reacted minimally later. While in experimental group, it reacted continuously strong from 3 to 12 weeks. The results of this study suggest that osteoporosis is not an absolute contraindication to dental implantation if sufficient period suggested after fixture installation till second stage surgery.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제42권
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• pp.10.1-10.9
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• 2020

Background: The aim of this study was to evaluate the long-term clinical stability of implants with acid-etched surfaces sandblasted with alumina using retrospective analyses of the survival rate, success rate, primary and secondary stability, complications, and marginal bone loss of the implants. Methods: Patients who had implants placed (TS III SA, SS II SA, SS III SA, and U III SA) with SA surfaces from Osstem (Osstem Implant Co., Busan, Korea) at the Seoul National University Bundang Hospital, from January 2008 to December 2010 were selected for the study. Patients' medical records and radiographs (panorama, periapical view) were retrospectively analyzed to investigate sex, age, location of implantation, diameter, and length of the implants, initial and secondary stability, presence of bone grafting, types of bone grafting and membranes, early and delayed complications, marginal bone loss, and implant survival rate. Results: Ninety-six implants were placed in 45 patients. Five implants were removed during the follow-up period for a total survival rate of 94.8%. There were 14 cases of complications, including 6 cases of early complications and 8 cases of delayed complications. All five implants that failed to survive were included in the early complications. The survival of implants was significantly associated with the occurrence of complications and the absorption of bone greater than 1 mm within 1 year after prosthetic completion. In addition, the absorption of bone greater than 1 mm within 1 year after prosthetic completion was significantly associated with the occurrence of complications, primary stability, and implant placement method. Five cases that failed to survive were all included in the early complications criteria such as infection, failure of initial osseointegration, and early exposure of the fixture. Conclusions: Of the 96 cases, 5 implants failed resulting in a 94.8% survival rate. The failed implants were all cases of early complications such as infection, failure of initial osseointegration, and early exposure of the fixtures. Periimplantitis was mostly addressed through conservative and/or surgical treatment and resulted in very low prosthetic complications. Therefore, if preventive measures are taken to minimize initial complications, the results can be very stable.