• The Journal of Advanced Prosthodontics
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• 제14권4호
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• pp.236-249
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• 2022

PURPOSE. The present study compared the accuracy between digital and conventional implant impressions. MATERIALS AND METHODS. The experimental models were divided into six groups depending on the implant location and the scanning span. Digital impressions were captured using the intraoral optical scanner TRIOS (3Shape, Copenhagen, Denmark). Conventional impressions were taken with the monophase impression material based on addition-cured silicones, Honigum-Mono (DMG, Hamburg, Germany). A high-precision laboratory scanner D900 (3Shape, Copenhagen, Denmark) was used to obtain digital data of resin models and stone casts. Surface tessellation language (STL) datasets from scanner were imported into the analysis software Geomagic Qualify 14 (3D Systems, Rock Hill, SC, USA), and scan body deviations were determined through two-dimensional and three-dimensional analyses. Each scan body was measured five times. The Sidak t test was used to analyze the experimental data. RESULTS. Implant position and scanning distance affected the impression accuracy. For a unilateral arch implant and the mandible models with two implants, no significant difference was observed in the accuracy between the digital and conventional implant impressions on scan bodies; however, the corresponding differences for trans-arch implants and mandible with six implants were extremely significant (P<.001). CONCLUSION. For short-span scanning, the accuracy of digital and conventional implant impressions did not differ significantly. For long-span scanning, the precision of digital impressions was significantly inferior to that of the traditional impressions.

• Journal of Periodontal and Implant Science
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• 제36권3호
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• pp.683-691
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• 2006

This study is an analysis of distribution of patients who installed Implantium implant in Yonsei University Dental Hospital and types of implant site for about 1 years recall check and success rate. 164 implants were installed to 52 patients in this study. It shows the conclusion below. 1. Patients at the age of 40s and 50s were 65% of all implant cases and average number of implant was 4 (man), and 2.7 (woman). 75 implants were operated on maxilla and 89 were mandible. 19 implants on anterior region and 145 implants on posterior region. 2. Most distribution of bone qaulity for implant site was type III(37.2%) and bone quantity was type C(61. 7%) 3. The majority of implants were those of 10, 12mm in length (85%) and regular diameter in width (48.8%). 4. 30 implants were installed with the advanced technique-GER, window opemng, osteotome technique. 5. Two implants were removed before prosthodontic treatment due to the osseointegraton failure. The success rate was 98.8% in 15.2 months follow up period and the marginal bone loss was 0.28mm. The results provided us with basic data on patient type, implant distribution, bone condition, and survival rate. Within the limit of present study, It was concluded that Implantium implant could be used satisfactorily in various clinical situations.

• 구강회복응용과학지
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• 제31권3호
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• pp.186-194
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• 2015

목적: 임플란트 위치와 길이가 하악 후방연장 가철성 국소의치(DERPD)와 연관된 임플란트의 응력 분포와 변위에 미치는 영향을 알아보는 것이다. 연구 재료 및 방법: #35, 36, 37이 소실된 시상절단면의 후방연장모형과 가철성 국소의치를 기본모형으로 사용했다. NX 9.0으로 7개의 모델을 디자인했다. 모델 A, B, C에서 각각 11, 6, 4 mm 길이의 임플란트가 #37 인공치 하방에 위치되었다. 모델 D, E, F에서 각각 11, 6, 4 mm의 임플란트가 #36 인공치 하방에 위치되었다. 모델 G는 임플란트가 없었다. 수직하중(250 N)을 #36의 중심와에 가했고, 유한요소 분석프로그램을 이용해 von Mises stress와 변위를 관찰했다. 결과: #37에 위치한 임플란트는 #36에 위치한 것과 비교시 주변골에 더 낮은 응력집중도를, #36에 위치한 임플란트는 #37에 위치한 것보다 더 적은 변위를 보였다. 결론: 임플란트 지지형 가철성 국소의치에서 후방부에 위치한 임플란트는 전방부에서보다 더 이점을 가지며, 길이가 더 긴 임플란트의 사용은 응력분산을 위해서 중요하다.

• 대한치과보철학회지
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• 제49권3호
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• pp.206-213
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• 2011

연구 목적: 임플란트 경부까지RBM 표면 처리를 한 Osstem$^{(R)}$ USII plus system (Osstem Co., Seoul, Korea)의 임상적 유용성을 평가하기 위하여 연세대학교 치과대학 병원에 내원한 환자 중 이 system을 이용하여 치료 받은 32명의 환자에게 식립된 88개의 임플란트를 대상으로 기능 부하 후 1년까지의 임상적, 방사선학적 결과를 후향적으로 분석하였다. 연구 재료 및 방법: 진료 기록부를 통해 전신 조건, 성별, 연령, 식립 위치, 식립 된 임플란트의 직경 및 길이 등을 조사하여 그에 따른 분포 및 생존율의 차이와 함께 이들 항목이 변연골 흡수량에 영향을 미치는지 조사하였다. 방사선사진 분석으로 임플란트 식립 시, 보철물 장착 후 6개월 내지 1년간의 변연골 흡수량을 측정하여 분석하였다. 각 항목과의 연관성 분석을 위하여 독립 t-검정(independent sample t-test)을 이용하였으며(${\alpha}$=.05), 보철물 장착 전과 보철물 장착 후 12개월 동안의 변연골 흡수량 비교를 위하여 일원 반복측정 분산 분석(one-way repeated-measures ANOVA)을 이용하였다(${\alpha}$=.05). 결과:총 32명에게 식립된 88개의 임플란트 중에서 실패한 것은 없었으며 누적 생존율은 100%로 나타났다. 임플란트 식립 시부터 보철물 장착까지의 변연골 흡수량은 0.24 mm이었으며, 보철물 장착 후 12개월까지의 변연골 흡수량은 평균 0.19 mm로 임플란트 식립 시부터 보철물 장착 12개월까지의 총 변연골 흡수량은 0.43 mm였다. 상악에 식립된 경우와 하악에 식립된 경우의 변연골 흡수량을 비교했을 때는 통계적으로 유의한 차이를 보이지 않았으나 구치부에 식립된 경우가 전치부에 식립된 경우에 비해 변연골 흡수량이 크게 나타났으며 이는 통계적으로 유의한 차이가 있었다. 결론: 이상의 결과를 토대로 보철물 장착 12개월까지의 기간 동안 임플란트 고정체의 경부까지 RBM 표면 처리를 한 외측 연결형의 국산 임플란트의 단기간 임상적인 성공률은 만족스러운 결과를 보였으며 변연골 흡수량도 임플란트 성공 기준에 부합하였다.

• Journal of Periodontal and Implant Science
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• 제38권3호
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• pp.413-428
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• 2008

Purpose: Given the predictability of dental implant procedure from the studies of successful osseointegration, implant dentistry is often the treatment of choice to replace missing teeth in edentulous patient instead of the fixed prosthesis or removable denture. The $Renova^{(R)}$ dental implant has a RBM(Resorbable Blast Media) surface, internal hex prosthetic connection and a tapered design. At this study gives the analysis of the implant and the short term survival rate of the implant. Material and Methods: In this study, a multilateral analysis was performed on the subjects undergoing placement with $Renova^{(R)}$ implant between August 2006 and February 2008 in Yonsei University dental hospital. 96 implants were placed in 56 patients and they were surveyed for cumulative survival rate. Among them 78 implants in 44 patients were surveyed for the rest analyses. Result: 1. The cumulative survival rate was 96.88% of 96 implants in 56 patients. 2. The mean marginal bone loss was 0.803mm and the marginal bone loss in augmentation group has higher value than the marginal bone loss in non augmentation group. 3. The health scale for the implants were 87% in success group, 9% in satisfactory survival group, 1% in compromised survival group, and 3% in failure group. 4. Two implants placed in poor bone posterior area by 2-stage failed during prosthetic procedure. Conclusion: $Renova^{(R)}$ dental implant showed high cumulative survival rate in installation on partial edentulous ridge and could be a predictable implant system.

• 구강회복응용과학지
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• 제30권2호
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• pp.170-175
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• 2014

성장장애는 두개안면부의 골격성장과 영구치의 조기상실에 영향을 미친다. 본 증례는 성장장애 환자에서 치아를 조기 상실한 부위에 무피판 술식으로 임플란트를 식립 시 컴퓨터 단층촬영(CT)을 통한 인접치아의 확인과 임플란트 가이드의 필요성을 살펴보았다. 특발성 저신장과 3급 정신지체의 20세의 여환에서 구치의 회복을 위해 임플란트 고정성 보철을 계획하였다. CT 영상에서 인접치가 심하게 협측으로 위치되어 있었고, 이를 반영하여 가이드를 제작후 임플란트를 식립하였다. 이상 위치된 인접치를 기준으로 임플란트를 식립할 경우 협측 골의 천공이 발생할 수 있다. 그러므로 성장장애 환자에서 치아 조기 상실부에 임플란트를 식립 시 CT를 통한 치아의 위치 확인과 가이드의 제작이 요구된다.

• 대한치과보철학회지
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• 제47권2호
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• pp.240-246
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• 2009

연구목적: 이 연구는 측방접근법을 통해 상악동 골이식을 시행한 후 임플란트를 식립하였을 때, 누적 생존률 및 성별, 연령별, 이식재, 자가골의 공여부, 술전 잔존골 양, 무치악 형태, 식립 시기, 임플란트 종류, 직경과 길이에 따른 임플란트의 생존률 및 변연골의 방사선학적 결과의 차이를 분석하고자 시행되었다. 연구 재료 및 방법: 상악 구치에 측방접근법을 통해 상악동 골이식술 후 임플란트 보철치료를 시행한 71명을 대상으로 하였으며 표면 처리된 나사모양의 임플란트를 사용하였다. Osseotite(BIOMET 3i, Warsaw, USA), Neoplant(Neobiotec, Seoul, Korea), $Br\ddot{a}nemark$(Nobel Biocare, Goteberg, Sweden)과 SSII(Osstem, Busan, Korea)를 사용하였다. 최소 6개월 이상의 기간 관찰 누적 생존률은 Kaplan-Meier 분석법을 이용하였으며 다른 요소에 따른 임플란트의 생존률의 유의성은 Chi-square test로 검정하였다. 결과: 상악동골 이식술이 시행된 모든 증례에서 임플란트 식립이 가능한 골 양이 얻어졌으며 92%의 생존률을 보였다. 결론: 상악동 골이식술을 시행한 후 임플란트 보철 수복은 자가골 단독 사용시에 자가골과 골대체 물질이 혼합된 것보다 우수한 생존률을 보였다. 지연 식립하는 경우가 임플란트와 동시에 식립하는 경우보다 생존률이 높았다.

• Journal of Periodontal and Implant Science
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• 제37권2호
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• pp.209-221
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• 2007

Recently, immediately after losing teeth. implant placement has been greatly attempted. Implant can help restoration of tooth functions within short time. This study was an attempt to examine the extent of osseointergation when the implants will be placed immediately after teeth extraction using domestic implant systems. Implants were inserted in beagle dogs and evaluated the clinical, radiological, histological and histomorphometric assay at 6 weeks and 12 weeks. For experimental materals, $STAGE-1^{(R)}$($4.1{\times}8mm$, Lifecore, USA), $SS-III^{(R)}$($4.0{\times}8mm$, OSSTEM, Korea) and $IFI^{(R)}$($4.0{\times}8mm$, Dio, Korea) implants treated with RBM were placed. All the placed site showed normal results without fail and inflammation clinically and radiologically. As a result of measurement by periotest, it showed $-2\;{\sim}\;-5$ and stable status comprehensively. There was no statistically significant difference among implants(p<0.05). Bone tissue adjacent to implant showed increased marrow tissue at 6 weeks. Nevertheless, osteogenic structure was not observed remarkably. In a 12 weeks opinion, bone tissue composed of osseointegration along implant interface showed significantly decreased marrow tissue containing central vessels unlike a 6 weeks opinion and matured compact bone whose osteogenic structure is well formed. BIC were 42.4%, 32.0% and 34.9%, respectively in 6 weeks and there was no statistically significant difference among group(p<0.05). In 12 weeks, BIC were 58.8%, 61.9% and 57.5%. respectively and there was no statistically significant difference among groups(p<0.05). It is considered that all 3 implant systems are suitable for immediate implant placement.

• Journal of Periodontal and Implant Science
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• 제37권3호
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• pp.647-653
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• 2007

Rapid crestal bone resorption following maxillary tooth loss is further accentuated in the posterior regions because of pneumatization and enlargement of the maxillary sinuses. A treatment rationale that allows preservation and augmentation of vertical available bone at the time of posterior maxil-lary tooth extraction may offer numerous therapeutic benefits which are more short courses of ther-apy and no needs of additional surgical augmentation. The present study comprised 3 patients who had 4 posterior maxillary teeth with no evident bone between the tooth apex and sinus floor, as estimated through preoperative radiographic analysis. Sinus floor augmentation at the time of tooth extraction was chosen for the ltreatment of these patients. After the tooth was carefully extracted, the empty alveolus was thoroughly debrided and a trephine approach was performed. Particulated autogenous bone was gently pushed beyond the empty alveolus to elevate the sinus membrane using an osteotome. The distance between bone crest and si-nus floor was radiographically estimated 4 months after the first procedure. Another procedure was then carried out to place the implants of 11 mm length without another augmentation procedure. All implant were clinically stable, with no sign of infection. The presented surgical procedure performed at the time of extraction of posterior maxillary teeth in close proximity to the sinus floor allowed placement of implants of proper length.

• 한국CDE학회논문집
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• 제16권5호
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• pp.315-322
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• 2011

The goal of total knee replacement (TKR) surgery is to replace patient's knee joint with artificial implants in order to restore normal knee joint functions. Since mismatched knee implants often cause a critical balancing problem and short durability, designing a well-fitted implant to a patient's knee joint is essential to improve surgical outcomes. We developed a software system that three-dimensionally (3D) simulates TKR surgery based upon 3D knee models reconstructed from computed tomography (CT) imaging. The main task of the system was to extract precise 3D anatomical parameters of a patient's knee that were directly used to determine a custom fit implant and to virtually perform TKR surgery. The virtual surgery was simulated by amputating a 3D knee model and positioning the determined implant components on the amputated knee. The test result shows that it is applicable to derive surgical parameters, determine individualized implant components, rehearse the whole surgical procedure, and train medical staff or students for actual TKR surgery. The feasibility and verification of the proposed system is described with examples.