• The Journal of Advanced Prosthodontics
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• 제8권6호
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• pp.494-503
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• 2016

PURPOSE. The aim of this study was to compare the efficacies of two-implant splinting (2-IS) and single-implant restoration (1-IR) in the first and second molar regions over a mean functional loading period (FLP) of 40 months, and to propose the appropriate clinical considerations for the splinting technique. MATERIALS AND METHODS. The following clinical factors were examined in the 1-IR and 2-IS groups based on the total hospital records of the patients: sex, mean age, implant location, FLP, bone grafting, clinical crown-implant ratio, crown height space, and horizontal distance. The mechanical complications [i.e., screw loosening (SL), screw fracture, crown fracture, and repeated SL] and biological complications [i.e., peri-implant mucositis (PM) and peri-implantitis (PI)] were also evaluated for each patient. In analysis of two groups, the chi-square test and Student's t-test were used to identify the relationship between clinical factors and complication rates. The optimal cutoff value for the FLP based on complications was evaluated using receiver operating characteristics analysis. RESULTS. In total, 234 patients with 408 implants that had been placed during 2005 - 2014 were investigated. The incident rates of SL (P<.001), PM (P=.002), and PI (P=.046) differed significantly between the 1-IR and 2-IS groups. The FLP was the only meaningful clinical factor for mechanical and biological complication rates in 2-IS. CONCLUSION. The mechanical complication rates were lower for 2-IS than for 1-IR, while the biological complication rates were higher for 2-IS. FLP of 39.80 and 46.57 months were the reference follow-up periods for preventing biological and mechanical complications, respectively.

• Journal of Periodontal and Implant Science
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• 제34권4호
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• pp.819-836
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• 2004

Nowdays, the awareness of implant treatment has grown rapidly among dentists and patients alike in Korea, as it becomes a widely accepted treatment. The reason is that unlike crown and bridge or denture treatment, implant treatment helps preserve existing bone and improve masticatory functions. So, It is needed understanding about the type, distribution of implant patient. The following results on patient type and implant distribution were compiled from 4433 implant cases of 1596 patients treated at the periodontal dept. of Y University Hospital during 1992 to 2004. 1. There are no dissimilarities between men and women, with patients in their 40, 50s accounting for 52.5% of patients and 57.5% of implant treatments; the largest share of patients and implant treatments. 2. Mn. posterior area accounted for 54.9% of implant treatments followed by Mx. posterior area(27.6%), Mx anterior area(11.9%) and Mn anterior area(5.6%). 3. Partial edentulous patients treated by single crown and bridge-type prosthesis accounted for 97.5% and fully edentulous patient accounted for the remaining 2.5%. 4. The major cause of tooth loss is periodontal disease, followed by dental caries, trauma and congenital missing. Also, older people are more likely to suffer from tooth loss due to periodontal disease rather than dental caries. 5. In the distribution of bone quality for maxillae, type III was most, followed by type II, r type IV and r type I. As for mandible, type II was most, followed by type III, type IV and for type I. 6. In the distribution of bone quantity for maxillae, type C was most, followed by type B, type D, type A, and for type E. As for mandible, type B was 52% most, followed by type C, type D, type A and type E. 7. The majority of implants were those of 1O-14mm in length (85.2%) and regular diameter in width (64%). The results provided us with basic data on patient type, implant distribution, bone condition, etc. We wish that our results coupled with other research data helps assist in the further study for better implant success/survival rates, etc.

• Journal of Periodontal and Implant Science
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• 제37권3호
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• pp.523-534
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• 2007

This study is an analysis of types of patients and distribution of implant site and survival rate of $Xive^{(R)}$ implant. The following results on patient type, implant distribution and survival rate were compiled from 324 implant cases of 140 patients treated at the periodontal dept. of Yonsei University Hospital and G dental clinic between February 2003 and April 2006. 1. There are no dissimilarities between men and women, with patients in their 30, 40, 50s accounting for 80% of patients and accounted for 82% of implant treatments; the largest share of patients and implant treatments. 2. Mn, posterior area. accounted for 57% of implant treatments followed by Mx. posterior area(29%), Mx, anterior area(8%) and Mn, anterior area(6%). 3. Partial edentulous patients treated by single crown and bridge-type prosthesis accounted for 96% and fully edentulous patient accounted for the remaining 4%. 4. The major cause of tooth loss is periodontal disease, followed by dental canes, trauma and congenital missing. 5, The distribution of bone quality for maxillae was 54,2% for type III, followed by 30.8% for type II, 15% for type IV and 0% for type I. As for mandible, the distribution was 63% for type II, followed by 34% for type III, 2,5% for type I and 0,5% for type IV. 6. The distribution of bone quantity for maxillae was 55% for type C, followed by 35% for type B, 8% for type D and 2% for type A. As for mandible, the distribution was 60% for type B, followed by 32% for type C, 7% for type A and 0% for type D. 7. The majority of implants were those of 9.5-13 mm in length(95%) and regular diameter in width(82%). 8. The total survival rate was 98%. The survival rate was 97% in the maxillae region and 99% in the mandible region. 9. The survival rate in type I was 83%, in type II was 99%, in type III was 97% and in type IV was 100%. As for the bone quantity, the survival rate in type A and D(100%) was most, followed by type B(99%) and type C(96%). The results showed that $Xive^{(R)}$ implant could be used satisfactorily compare for the other implant system. But we most to approach carefully in certain extreme condition especially with poor bone quality and quantity.

• Journal of Periodontal and Implant Science
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• 제32권3호
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• pp.539-554
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• 2002

It has been approximately 40 years since $Br{{\aa}}nemark$ first introduced osseo-integration for implants in the early 1960s. Unlike crown and bridge or denture treatment, implant treatment helps preserve existing bone and improve masticatory functions. Thus, the awareness of implant treatment has grown rapidly among dentists and patients alike in Korea, as it becomes a widely accepted treatment. The following results on patients type and implant distribution were compiled from 1814 implant cases of 640 patients treated at the periodontal dept. of Y University Hospital during 1992 to 2001. 1. There are no dissimilarities between men and women, with patients in their 40,50s accounting for 49% of patients and 56% of implant treatments; the largest share of patients and implant treatments. 2. Mn. posterior area accounted for 59% of implant treatments followed by Mx. posterior area(21%), Mx anterior area(l4%) and Mn anterior area 2%. 3. Partial edentulous patients treated by single crown and bridge-type prosthesis accounted for 98% and fully edentulous patient accounted for the remaining 2% 4. The major cause of tooth loss is periodontal disease, followed by dental caries, trauma and congenital missing. Compared to women, men are more likely to suffer from tooth loss due to periodontal disease. Also, older people are more likely to suffer from tooth loss due to periodontal disease rather than dental caries. 5. The distribution of bone quality for maxillae was 52% for type III, followed by 23% for type II, 20% for type IV and 0% for type I. As for mandible, the distribution was 52% for type II, followed by 37% for type III, 7% for type IV and 4% for type I. 6. The distribution of bone quantity for maxillae was 49% for type C, followed by 34% for type B, 14% for type D, 3% for type A, and 0% for type E. As for mandible, the distribution was 52% for type B, followed by 35% for type C, 6% for type D, 3% for type A and 0% for type E. 7. The majority of implants were those of 10-14mm in length (80%) and regular diameter in width (79%). The results provided us with basic data on patient type, implant distribution, bone condition, etc. We wish that our results coupled with other research data helps assist in the further study for better implant success/survival rates, etc.

• 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.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제39권6호
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• pp.274-282
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• 2013

Objectives: The posterior maxillary region often provides a limited bone volume for dental implants. Maxillary sinus elevation via inserting a bone graft through a window opened in the lateral sinus wall has become the most common surgical procedure for increasing the alveolar bone height in place of dental implants in the posterior maxillary region. The purpose of this article is to assess the change of bone volume and the clinical effects of dental implant placement in sites with maxillary sinus floor elevation and autogenous bone graft through the lateral window approach. Materials and Methods: In this article, the analysis data were collected from 64 dental implants that were placed in 24 patients with 29 lacks of the bone volume posterior maxillary region from June 2004 to April 2011, at the Department of Oral and Maxillofacial Surgery, Inha University Hospital. Panoramic views were taken before the surgery, after the surgery, 6 months after the surgery, and at the time of the final follow-up. The influence of the factors on the grafted bone material resorption rate was evaluated according to the patient characteristics (age and gender), graft material, implant installation stage, implant size, implant placement region, local infection, surgical complication, and residual alveolar bone height. Results: The bone graft resorption rate of male patients at the final follow-up was significantly higher than the rate of female patients. The single autogenous bone-grafted site was significantly more resorbed than the autogenous bone combined with the Bio-Oss grafted site. The implant installation stage and residual alveolar height showed a significant correlation with the resorption rate of maxillary sinus bone graft material. The success rate and survival rate of the implant were 92.2% and 100%, respectively. Conclusion: Maxillary sinus elevation procedure with autogenous bone graft or autogenous bone in combination with Bio-Oss is a predictable treatment method for implant rehabilitation.

• The Journal of Advanced Prosthodontics
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• 제1권1호
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• pp.31-36
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• 2009

PURPOSE. To determine the change in stability of single-stage, three different design of implant systems in humans utilizing resonance frequency analysis for early healing period(24 weeks), without loading. MATERIAL AND METHODS. Twenty-five patients were included into this study. A total of 45 implants, three different design of implant systems(group A,C,R) were placed in the posterior maxilla or mandible. The specific transducer for each implant system was used. ISQ(implant stability quotient) reading were obtained for each implant at the time of surgery, 3, 6, 8, 10, 12, 24 weeks postoperatively. Data were analyzed for different implant type, bone type, healing time, anatomical locations. RESULTS. For each implant system, a two-factor mixed-model ANOVA demonstrated that a significant effect on ISQ values(group A=0.0022, C=0.017, R=0.0018). For each implant system, in a two-factor mixed model ANOVA, and two-sample t-test, the main effect of jaw position(P > .005) on ISQ values were not significant. CONCLUSIONS. All the implant groups A, C and R, the change patterns of ISQ over time differed by bone type. Implant stability increased greatly between week 0 and week six and showed slow increase between week six and six months(plateau effect).

• 구강회복응용과학지
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• 제24권3호
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• pp.253-267
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• 2008

이 연구의 목적은 임플란트 고정체와 지대주간의 직경 차이가 임플란트 지지조직에 발생하는 응력에 미치는 영향을 평가 하는 것이다. 본 연구에는 세 가지 직경(4.0, 5.0, 6.0㎜)의 3i 임플란트 고정체에 지대주의 직경을 달리하여 수복하고, 하중 조건(15, 30 lb)에 따라 임플란트 지지조직에 발생한 응력의 정도와 분포를 광탄성 응력 분석법을 이용하여 비교, 분석하였다. 연구결과 고정체의 직경이 증가할수록, 상부 보철물에 가해지는 하중에 대하여 고정체 변연부의 응력집중이 높게 나타났으며, 상부 보철물의 근원심 폭경을 증가시키는 것이나, 임플란트 고정체의 직경에 비해 작은 지대주를 사용하는 것은 고정체 주위의 응력양상에 영향을 주지 않았다.

• 대한치과보철학회지
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• 제56권3호
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• pp.212-217
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• 2018

목적: 본 연구의 목적은 구치부 식립 임플란트에서 지대주 나사 풀림의 발생 빈도 및 지대주 나사 풀림에 영향을 주는 다양한 요인들을 후향적 연구를 통하여 평가하는 것이다. 대상 및 방법: 2013년 1월부터 2016년 1월까지 208명의 환자에서 구치부에 식립한 391개의 임플란트를 대상으로 하였다. 모든 수복물은 고정성으로 단일 혹은 연결 크라운, 브릿지로 제작되었으며, 임시 시멘트로 합착하였다. 전체 수복물 중 지대주 나사 풀림의 발생 빈도를 조사하였고, 성별, 보철물의 위치, 대합치, 보철물의 유형, 지대주 연결 유형, 매식체의 지름이 지대주 나사 풀림에 미치는 영향을 평가하였다. 결과: 2 - 5년의 관찰 결과, 총 29개(7.4%)의 임플란트에서 지대주 나사 풀림이 발생하였다. 최종 수복 후 지대주 나사 풀림이 발생하기까지 소요된 기간은 3개월부터 48개월(평균19.5개월)까지 다양하게 나타났으며, 이 중 3개의 임플란트에서 매식체의 파절이 발생되었다. 고려 요인들 중, 임플란트의 식립 위치에 따라 대구치(9.4%)와 소구치(2.6%)에서 통계적으로 유의한 차이를 보였으며(P < .019), 대합치에 따라 자연치(9.9%), 임플란트(1.0%), 가철성 보철물(0%)에서 유의한 차이를 보였다(P < .018). 다른 고려 요인에 따른 지대주 나사 풀림 발생 빈도는 통계적 유의성이 없었다. 결론: 구치부 임플란트 수복물에서 지대주 나사 풀림의 발생 빈도는 7.4%로 나타났다. 소구치보다 대구치에서 유의하게 높은 발생 빈도를 보였으며, 대합치에 따라서는 임플란트, 가철성 보철물과 비교 시 자연치에서 유의하게 높은 발생 빈도를 보였다.

• 대한치과보철학회지
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• 제41권4호
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• pp.393-404
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• 2003

Statement of problem. Higher incidence of prosthetic complications such as screw loosening, screw fracture has been reported for posterior single tooth implant. So, there is ongoing research regarding stability of implant-abutment interface. One of those research is increasing the implant diameter and prosthetic table width to improve joint stability. In another part of this research, internal conical type implant-abutment interface was developed and reported joint strength is higher than traditional external hex interface. Purpose. The purpose of this study is to compare stress distribution in single molar implant between external hex butt joint implant and internal conical joint implant when increasing the implant diameter and prosthetic table width : 4mm diameter, 5mm diameter, 5mm diameter/6mm prosthetic table width. Material and method. Non-linear finite element models were created and the 3-dimensional finite element analysis was performed to see the distribution of stress when 300N static loading was applied to model at $0^{\circ},\;15^{\circ},\;30^{\circ}$ off-axis angle. Results. The following results were obtained : 1. Internal conical joint showed lower tensile stress value than that of external hex butt joint. 2. When off-axis loading was applied, internal conical joint showed more effective stress distribution than external hex butt joint. 3. External hex butt joint showed lower tensile stress value when the implant diameter was increased. 4. Internal conical joint showed lower tensile stress value than external hex butt joint when the implant diameter was increased. 5. Both of these joint mechanism showed lower tensile stress value when the prosthetic table width was increased. Conclusion. Internal conical joint showed more effective stress distribution than external hex joint. Increasing implant diameter showed more effective stress distribution than increasing prosthetic table width.