• Maxillofacial Plastic and Reconstructive Surgery
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• 제21권4호
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• pp.376-381
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• 1999

A variety of materials and procedures such as sinus floor elevation, sinus-lift graft, inlay bone graft using Le Fort I osteotomy, and onlay graft have been used to create adequate bone volume in the maxillary sinus for placement of endosseous implants in the posterior atrophic maxilla. Because of the frequent lack of bone in the posterior maxilla, sinus lift procedure has become a commonly practiced treatment modality. The 138 endosseous implants of 36 patients with sinus augmentation procedures performed in Korea University Hospital from January 1991 to December 1998 were summarized and analysed. The result of this study were as follows: 1. Age ranged from 39 to 57, with a mean of 50.7. 2. The mean survival rate for 138 implants with maxillary sinus lift procedure was 80.4%. 3. There was no corelationship between the fixture length, width and the survival rate. 4. The result showed that the healing period for 8-12 months was necessary if the residual alveolar bone height was less than 5mm. 5. Autogenous iliac corticocancellous block graft showed the most favorable survival rate(95%).

• Maxillofacial Plastic and Reconstructive Surgery
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• 제31권4호
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• pp.306-313
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• 2009

Objectives: The aim of the present review was to evaluate survival rate and various factors associated with survival of osseointegrated implants. Patients and methods: The clinical comparisons were performed to evaluate survival rate of 794 endosseous implants that had been inserted between 2004 through 2008 in relation to sex and age of patients, position of implant, implant system and surface characteristics, length and diameter of implant, and bone graft technique. Results: The survival rate of implant was 94.3% in posterior area of maxilla and 98.6% in posterior area of mandible by position of implant, a statistically significant difference. As to diameter of implant, survival rate was 98.4% between the 4.0 and 4.5 mm and 75.0% in larger than 5.0 mm, that was statistically significant difference. There was a statistically significant difference regard to bone graft and surgical technique. The implant survival rate was 89.0% in a placement site which performed sinus lifting, and in case of implant placement with guided bone regeneration technique and without bone grafting was 97.6% and 100% each. Conclusion: According to these findings, this study establishes a relationship between survival rate of implant and position, surface characteristics, diameter of implant and bone graft technique.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제46권3호
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• pp.162-173
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• 2020

Dental implants are the first option for replacement of missing teeth. Failure usually involves additional cost and procedures. As a result, the physician should limit the risk factors associated with implant failures. Implant site is one of many factors that can influence the success or failure of dental implants. The association between early implant failure (EIF) and implant site has yet to be documented. This review aims to estimate the impact of insertion site on the percentage of EIFs. An electronic and manual search of studies that reported early failure of dental implants based on collection site. A total of 21 studies were included in the review and examined for the association between EIF and alveolar site. Subgroup analysis, including a comparison between implants inserted in four alveolar ridge regions of both jaws was performed. The early failure rate was higher for maxillary implants (3.14%) compared to mandibular implants (1.96%). Applying a random effect, risk ratio (RR), and confidence interval (CI) of 95% revealed higher failure in the maxilla compared to the mandible (RR 1.41; 95% CI [1.19, 1.67]; P<0.0001; I²=58%). The anterior maxilla is more critical for early implant loss than other alveolar bone sites. Implants in the anterior mandible exhibited the best success rate compared of the sites.

• Journal of Periodontal and Implant Science
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• 제42권3호
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• pp.105-109
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• 2012

Purpose: Soft tissue recessions frequently cause esthetic disharmony and dissatisfaction. Compared with soft tissue coverage around a tooth, the coverage of an implant site is obviously unpredictable. Particularly in the cases of thin mucosa, a significant greater amount of recession takes place compared to thick mucosa. To overcome this problem, this case report demonstrates a two-step mucosal dehiscence coverage technique for an endosseous implant. Methods: A 33-year-old female visited us with the chief complaint of dissatisfaction with the esthetics of an exposed implant in the maxillary left cental incisor region. A partial-thickness pouch was constructed around the dehiscence. A subepithelial connective tissue graft was positioned in the apical site of the implant and covered by a mucosal flap with normal tension. At 12 months after surgery, the recipient site was partially covered by keratinized mucosa. However, the buccal interdental papilla between implant on maxillary left central incisor region and adjacent lateral incisor was concave in shape. To resolve the mucosal recession after the first graft, a second graft was performed with the same technique. Results: An esthetically satisfactory result was achieved and the marginal soft tissue level was stable 9 months after the second graft. Conclusions: The second graft was able to resolve the mucosal recession after first graft. This two-step approach has the potential to improve the certainty of esthetic results.

• 대한치과보철학회지
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• 제38권3호
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• pp.360-365
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• 2000

The completely edentulous patient has few treatment options in conventional dentistry. When implants are considered, treatment plans range from a 2-implant overdenture to a completely implant-supported prosthesis. Fixed prosthesis is often the preferred selection of the edentulous patient. fixed full-arch cert amo-metal restorations can be a predictable implant treatment modality for the edentulous patient. Implant-supported fixed prosthesis has several advantages: predictability, fixedness, retrievability, improved function, lower maintenance of prosthesis, long-term published success. Edentulous patients with a severely resorbed mandible often experience problems with their dentures. Treatment concepts involving two to four implants for the support of an overdenture have been proposed. There seems to be no need to insert more than two endosteal implants to support an overdenture, however, long-term prospective studies are needed to support this notion. Using short endosseous implants and an overdenture in the extremely resorbed mandible is a justified treatment option because of the relative simplicity and low morbidity of this treatment strategy. Implant-supported overdenture has several advantages: Cost, retrievability, hygiene access, profile and contour control, increased retention and stability, implant installed in a predicted region(ant. mandible).

• 구강회복응용과학지
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• 제22권2호
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• pp.161-171
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• 2006

Endosseous implants have restored normal function and dental health to many patients. When implants were introduced as an effective treatment modality, their efficacy was limited by the amount of available bone. Today, various grafting procedures can surgically create bone width and volume. Implants can be placed in more ideal locations for successful prosthetic reconstruction. The use of autogenous bone grafts represents the "gold standard" for bone augmentation procedures. Either intraoral or extraoral sites may be considered for donor sites. Alveolar ridge augmentation using autogenous bone block, can be done during implant placement or staged with implant placement, after bone graft healing. In the staged technique, a better implant positioning and the use of wide diameter implants are possible. Alveolar ridge augmentation using autogenous block graft is a predictable way of treatment, for the atrophic alveolar ridge before implant placement. The cases presented in this article clinically demonstrate the efficacy of using a autogenous block graft in generating effective new bone fill for dental implant placement.

• 구강회복응용과학지
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• 제25권3호
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• pp.287-292
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• 2009

최근에는 임플란트를 이용한 치료가 예측 가능한 치료로 자리 잡고 있다. 충분한 골질과 골량은 임플란트의 성공에 중요한 역할을 한다. 10 mm 이하의 임플란트의 사용은 골질이 불충분할 때 부가적인 수술의 대안이 될 수 있다. 이 논문은 길이 10 mm 이하의 임플란트와 관련된 생역학적 관점과 발표된 임상결과들을 리뷰하고 사용 예지성을 제시하고자 하였다. 임플란트의 초기고정여부, 시술자의 learning curve, 사용한 임플란트의 표면처리, 환자의 골질들을 적절히 고려한 후 짧은 길이의 임플란트를 사용한다면 부가적인 수술 필요성의 대안이 될 수 있을 것이다.

• 구강회복응용과학지
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• 제25권4호
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• pp.417-429
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• 2009

골유착성 임플란트가 소개된 이후로 부분 및 무치악 부위에서 사용되어 높은 성공률과 함께 예지성 있는 결과를 보여주는 치료방법으로 인정받고 있다. 그러나 국내에서 개발된 임플란트에 대해서는 임상적이고 객관적인 연구 자료가 불충분하다. 본 연구에서는 31명의 환자에게서 임플란트 경부에 미세나사를 지닌 임플란트 식립 후 평균 21개월의 기간 동안 임플란트의 생존율에 관한 조사를 시행하였고 부하가 가해지는 시점을 기준으로 12개월 간 변연골의 변화를 파노라마사진을 이용하여 측정 관찰하여 다음의 결과를 도출하였다. 총 96개의 임플란트에서 3개의 임플란트가 실패하여 96.9%의 생존율을 보였다. 50대 환자에서 85.7%로 가장 작은 생존율을 보였으며 성별 및 연령에 따른 생존율 및 변연골 흡수량에 대한 통계적 유의성은 존재하지 않았다. 상악에서는 95.7% 하악에서는 100%의 생존율을 보였다. 골이식 여부, 보철물의 종류, 매식체의 길이 및 직경에 따른 생존율의 차이는 통계적으로 유의한 차이를 보이지 않았다. 기능 부하 후 임플란트 변연골 흡수량은 단일 금관 보철물이 연결 고정 보철물에 비해 증가된 양상을 보였으나 임플란트의 직경, 길이, 골이식의 유무, 식립위치에 의해서는 통계적으로 유의한 차이를 보이지 않았다. 이 연구를 통해 경부에 미세나사를 지닌 임플란트 식립 후에 임플란트 변연골 흡수량은 비교적 적게 일어났으며 또한 안정적으로 유지되는 것이 관찰될 수 있었고 이에 따른 장기적인 추적관찰이 필요할 것으로 사료된다.

• 대한치과보철학회지
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• 제28권1호
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• pp.7-23
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• 1990

The success or failure of endosseous dental implants is related to the cellular activity at the implant surface. Success seems to be associated with the enclosure of the implant in a non-inflammed connective tissue or the formation of a direct bone implant interface. The purpose of this study was to examine the tissue reactions to the various implants at the submergible state in dog mandible. The $Br\"{a}nemark$, Core-Vent, Intergral, Bone spiral were selected for evaluation and also the Kimplant, Nephrite were used for the experimental study. After 4 months the animals were sacrificed. The interface zone between bone and implant was investigated using x-rays, light microscope, scanning electron microscope, transmission electron microscope. The following results were obtained from this study. 1. $Br\"{a}nemark$, Core-Vent, Kimplant, Integral showed no mobility and bone growth over the healing screws of the implants. Histologically most of the implant surface were covered by remodelled lamellar bone, and partly by a cellular layer or the thin fibrous tissue layer. 2. The Bone spiral showed no mobility and partially radiolucent line around the implant. The upper part of the implant was surrounded by a thin fibrous connective tissue and the middle, apical part of it were contacted with bone directly. 3. The Nephrite implant showed severe mobility and a radiolucent line around the implant. Histologically it showed mild inflammation and was surrounded by a fibrous connective tissue. 4. Scanning electron microscope showed that there was no amorphous ground substance in the Nephrite implant but the formation of ground substance over the collagen filaments in other implants. 5. Transmission electron microscope showed that collagen filaments were approached irregularly to the surface of all implants and in the $Br\"{a}nemark$, Core-Vent, Kimplant, Integral there was amorphous layer between the implant and the collagen filaments. It seemed to be ground substances.

• Journal of Periodontal and Implant Science
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• 제44권3호
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• pp.102-108
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• 2014

Purpose: Rehabilitation of the incomplete dentition by means of osseointegrated dental implants represents a highly predictable and widespread therapy; however, little is known about potential risk factors that may impair long-term implant success. Methods: From 2004 to 2012, a total of 13,147 implants were placed in 4,316 patients at the Academy for Oral Implantology in Vienna. The survival rates after 8 years of follow-up were computed using the Kaplan-Meier method, and the impact of patient- and implant-related risk factors was assessed. Results: Overall implant survival was 97% and was not associated with implant length (P=0.930), implant diameter (P=0.704), jaw location (P=0.545), implant position (P=0.450), local bone quality (P=0.398), previous bone augmentation surgery (P=0.617), or patient-related factors including osteoporosis (P=0.661), age (P=0.575), or diabetes mellitus (P=0.928). However, smoking increased the risk of implant failure by 3 folds (P<0.001) and a positive history of periodontal disease doubled the failure risk (P=0.001). Conclusions: Summing up the long-term results of well over 10,000 implants at the Academy for Oral Implantology in Vienna it can be concluded that there is only a limited number of patients that do not qualify for implant therapy and may thus not benefit from improved quality of life associated with fixed implant-retained prostheses.