• 대한치과보철학회지
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• 제44권2호
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• pp.174-184
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• 2006

Purpose: Current trend in implant dentistry is changing from external connection to internal connection. To evaluate the splinting of external and internal connection implant on screw loosening, 2-units prosthesis was fabricated with BioPlant $System^(R)$ of external connection type and Lifecore STAGE-1 Single Stage Implant $System^(R)$ of internal connection type. Material and Method: Experimental group is classified into three groups. 1) $G_1-EE$: 2-units prosthesis was fabricated with two Bioplant $System^(R)$ of external connection type. 2) $G_1-EI$: 2-units prosthesis was fabricated with one BioPlant $System^(R)$ of external connection type and one Lifecore STAGE-1 Single Stage Implant $System^(R)$ of internal connection type. 3) $G_1-II$: 2-units prosthesis was fabricated with two Lifecore STAGE-1 Single Stage Implant $System^(R)$ of internal connection type. In fabricating 2-units prosthesis, two hexed abutments are recommended when two implants are installed parallel, otherwise one hexed abutment is used on major occlusal force area and one nonhexed abutment is used on the other area. Since it is rare to find two implants being parallel, it is hard to fabricate prosthesis with passive adaptation using two hexed abutments. It is much more difficult to acquire passive adaptation when using hex abutment compared to nonhex abutment. To evaluate the influence of hexed and nonhexed abutment on screw loosening, 2-units prosthesis was fabricated with hexed and nonhexed abutment. Experimental group is classified into three groups. 1) $G_2-HH$: 2-units prosthesis was fabricated with two hexed abutments. 2) $G_2-HN$: 2-units prosthesis was fabricated with one hexed abutment and one nonhexed abutment. 3) $G_2-NN$: 2-units prosthesis was fabricated with two nonhexed abutments. Result: The results of comparing the detorque value after loading on a each prosthesis periodically are as follows. 1. In splinting group of external and internal connection implant, $G_1-II$ group demonstrated the biggest detorque value, followed by $G_1-EI$ group and $G_1-EE$ group. 2. There is no notable significance between external connection implant of $G_1-EI$ group and $G_1-EE$ group and also no significance between internal connection implant of $G_1-EI$ group and $G_1-II$ group. 3. $G_2-HH$ group showed higher detorque value than $G_2-HN\;and\;G_2-NN$ group. From the results, we can concluded that using both external connection and internal connection implant together is clinically acceptable and in order to acquire a good passive adaptation in fabricating 2-units implant prosthesis we can use two nonhexed abutments.

• 대한치과보철학회지
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• 제46권1호
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• pp.53-64
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• 2008

임플랜트 주위 변연골의 흡수는 임플랜트의 기능적 및 심미적 성공에 큰 장애가 되는 요인이다. Adell은 임플랜트에 지대주 연결 후 첫 1년간 평균적으로 1.5mm의 변연골 소실을 보이고, 이 후에는 매년 0.1mm이하의 변연골 흡수가 있었다고 하였다(Adell et al.,1981). 이러한 변연골 흡수를 막기위한 많은 노력들이 행해져 왔다. 특히 임플랜트 collar의 특징에 따라서 변연골의 흡수가 달라질 수 있다. 본 연구의 목적은 임플랜트 collar에서의 laser microtexturing(microgroove)이 변연골 흡수에 미치는 영향에 대해 알아보고자 하는 것이다. 4종류의 임플랜트 총 101개를 식립한 환자 53명에서 임플랜트 식립시부터 보철물 장착한 후 평균 6개월 후 정기 검사 시까지의 임플랜트 주위 변연골의 흡수를 측정하여 비교하였다. 생물학적 폭경을 충분히 확보한 임플랜트(ITI standard)와 생물학적 폭경이 부족한 임플랜트 (ITI esthetic plus, Silhouette IC Laser-$Lok^{TM}$, Silhouette IC)에서 변연골 흡수의 차이를 비교하였고, 임플랜트 주위 변연골의 흡수에 대한 laser를 이용한 미세나사산의(Silhouette IC Laser-$Lok^{TM}$) 영향을 알아보았다. 다음의 결과를 얻었다. 1. ITI standard와 Silhouette IC Laser-$Lok^{TM}$ 이 ITI esthetic plus 와 Silhouette IC 보다 임플랜트 주위 변연골의 흡수가 적었고 (p<0.05), ITI standard 와 Silhouette IC Laser-$Lok^{TM}$ 사이에는 변연골의 흡수가 유의차가 없었고(P>0.05), ITI esthetic plus와 Silhouette IC 사이에도 변연골의 흡수가 유의차가 없었다(P>0.05). 2. 사용된 임플랜트 전체에 대한 상하악의 비교에서는 상하악 사이에서 임플랜트 주위 변연골의 흡수는 통계학적으로 유의한 차이가 없었다(p>0.05). 3. 흡수각도에 대한 비교에서도 4종류 임플랜트 그룹 간에 통계학적으로 유의한 차이는 없었다(P>0.05). 본 연구에서 제한이 있긴 하지만, 임플랜트 디자인에서 생물학적 폭경이 부족한 경우(ITI esthetic plus, Silhouette IC)에는 생물학적 폭 경 보상을 위한 임플랜트 주위 변연골의 흡수가 있었음을 보여주고 있으나, laser를 이용한 microgroove 가 부여된 임플랜트에서는 collar의 거칠기와 laser microtexturing 등의 특징에 의해 임플랜트 주위 변연골의 흡수가 적게 일어난 것이 관찰되었다. 심미적인 요구도가 높은 전치부에서 충분한 생물학적 폭경이 확보된 임플랜트를 식립할 경우 변연골의 흡수에 따른 치은퇴축에 의해 metal collar의 노출이 우려되기에 충분한 생물학적 폭경이 부여되지 않은 임플랜트를 선정하게 되는데 이때 collar에서의 laser microtexturing은 변연골의 유지에 도움이 되었다. 이것은 조직의 단단한 부착으로 인한 안정화로 추정해 볼 수 있는데, 이에 대해서는 더 장기간의 연구와 더 많은 수의 임플랜트를 대상으로 한 연구와 조직학적인 연구도 필요할 것으로 사료된다.

• 대한치과의사협회지
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• 제50권12호
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• pp.743-754
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• 2012

urpose : The purpose of this study was to evaluate the US II plus/GS II Osstem$^{(R)}$ implants through the study for the clinical success rate during the installation of the Osstem¢Á implants after bone graft. Materials and Methods : This study was researched in the 4 medical institutions: Chonnam National University, Chosun University, Bundang Seoul National University Hospital, and FM dental clinic from May, 2002 to September, 2009. Based on the total number of 60 patients whose treatment was the installation of the US II plus/GS II Osstem¢Á implants after bone graft, we evaluated success rate of implants. We analysis the distribution of patient's age and gender, edentulous area, bone type, fixture length and diameter, installation and loading time, donor site, bone graft material and method, antagonistic teeth, and survival and success rate. From these analyses we got the following results. Results : 1. In this study, the total number of patients who have been installed with US II plus implant was 27, and total of 52 implants were installed. The average age was 38.9, with 16 male, and 11 female patients. 2. The total number of patients who have been installed with GS II implant was 33, and total of 54 implants were installed. The average age was 49.7, with 24 male, and 9 female patients. 3. As for bone graft method, either autogenous bone or a mix of autogenous and heterogenous bone was used(88.4%) for US II plus. Chin, iliac, and Maxillary tuberosity were the donor sites for autogenous bone graft, and onlay method of bone graft was performed. 4. Allogenic bone or a mix of autogenous and heterogenous bone was used(77.8%) for GS II. Chin, ramus, and tibia were the donor sites for autogenous bone graft, and GBR method of bone graft was performed. 5. The duration from the installation of implants to setting of final prosthesis was average of 16 months and 10 months for US II plus and GS II respectively. Also, the final follow up period was average of 31 months and 28 months respectively. During this period, one GS II implant was removed from 1 patient due to failure of early osteointegration. 6. The survival rates were 100% and 98.1%, and success rates were 94.2% and 94.4% for US II plus and GS II implant respectively. Conclusion : On the evaluation of our clinical study, both US II plus and GS II Osstem¢Á implants showed the excellent clinical results after bone graft.