• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제48권3호
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• pp.159-166
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• 2022

Objectives: The stability of crestal bone has been reported as a major factor in the success of dental implants. Implants can be placed in an equicrestal (crestal) or subcrestal position. The aim of this study was to evaluate the effect of implant depth placement on marginal bone loss. Materials and Methods: The study was created in a split-mouth design. Immediately after implant surgery, digital parallel radiographs were prepared and levels of bone were measured where marginal bone loss and bone level changes occurred. These measurements were repeated at 3-month and 6-month follow-up periods. Results: In this interventional study, 49 implants were evaluated in 18 patients. Primary bone height was not significant between the intervention and control groups in both mesial and distal aspects at 3 months and 6 months from the baseline. The mean marginal bone loss on the mesial side was 1.03 mm in the subcrestal group and 0.83 mm in the crestal group. In addition, mean marginal bone loss on the distal side was 0.88 mm and 0.81 mm in the subcrestal and crestal groups, respectively. Marginal bone loss was not significantly different between sexes, the maxilla or mandible, and in the anterior or posterior regions as well as between different lengths and diameters of implants. Conclusion: Based on the results of this study, there was no significant difference in terms of marginal bone loss between crestal and subcrestal implants.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제48권4호
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• pp.245-245
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• 2022

• 대한소아치과학회지
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• 제45권4호
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• pp.521-527
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• 2018

치아의 외상에서 파절편의 재부착은 본래 치아의 형태, 질감, 색, 방사선투과성을 재현하여 우수한 심미성을 제공한다. 9세의 남자 환자가 상악 우측 중절치의 복잡 치관-치근 파절로 내원하였다. 심한 치관 손상과 골 연하로 연장된 파절로 인해 예후가 불량했지만 환자의 나이를 고려하여 치아 파절편을 재부착하기로 결정하였다. Mineral trioxide aggregate(MTA)를 이용한 일회 내원 치근관형성술 후에 골절제술과 포스트 식립을 동반하여 치아 파절편을 재부착하였다. 정기적인 관찰결과 임상 및 방사선학적으로 양호한 결과를 나타냈기에 보고하고자 한다.

• Journal of Periodontal and Implant Science
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• 제38권2호
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• pp.135-142
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• 2008

Purpose: Numerous studies have shown that crestal bone resorption around the implant was related to the location of the implant abutment junction(IAJ). Recently it was hypothesized that platform switching termed the inward horizontal repositioning of the IAJ might limit bone resorption around the implants. The purpose of this clinical study was to evaluate the effect of platform switching on crestal bone resorption. Materials and Methods: The crestal bone loss of 65 external hex implants in 26 patients were radiographically measured at crown placement and follow-up examinations. 23 standard implants(non-platform switching group, NP) were connected with the matching abutments and 42 wide implants(platform switching group, PS) were connected with the 1 mm smaller diameter abutments. Results: There was significant difference of crestal bone loss between NP group and PS group. For implants in the NP group, mean crestal bone loss was $1.18{\pm}0.68\;mm$ at crown placement and $1.42{\pm}0.41\;mm$ at follow-up. The meal bone loss in PS group was $0.47{\pm}0.52\;mm$ at crown placement and $0.60{\pm}0.65\;mm$ at follow-up. When the crestal bone changes according to placement depths of implants were compared, subcrestal position of IAJ had a significantly less bone loss in PS group, but it was not in NP group. Conclusion: Within the limits of the present study, it was concluded that platform switching technique might decrease crestal bone loss around the implants. Additionally, when the IAJ of implant was placed 1 mm deeper in the alveolar bone, the effect of platform switching on bone loss was enhanced.

• 구강회복응용과학지
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• 제35권4호
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• pp.235-243
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• 2019

골유착은 기능 하중을 받는 임플란트에 치조골이 직접적으로 접촉하는 역동적인 과정이라고 보고되었다. 골유착을 평가하기 위한 다양한 방법들이 시도되었고 그 중 골-임플란트 접촉 비율을 측정하는 방법이 가장 흔히 사용되고 있다. 골-임플란트 접촉 비율은 조직학적 분석을 통해서만 측정이 가능하지만 인간에서 성공적으로 골유착을 형성한 임플란트에 조직학적 분석을 시행한 연구는 많지 않다. 임플란트가 부적절한 위치에 식립되었거나, 식립 후 통증이나 감각 장애가 있는 경우, 임플란트 구조물이 파절된 경우와 같이 임플란트 제거가 필요한 경우에서만 골-임플란트 접촉 비율을 측정할 수 있기에 이는 매우 특별한 기회라고 할 수 있다. 본 증례에서는 3년간의 기능 하중을 받은 후 매식체 파절로 제거된 임플란트에서 조직학적 분석을 시행하였다. 조직 형태학적 연구 결과 임플란트 전체를 기준으로 골-임플란트 접촉 비율을 측정한 경우 대비 치조제 하부만 포함하여 골-임플란트 접촉 비율을 측정한 경우 각각 접촉 비율은 53.1%, 70.9%로 나타났다. 본 증례를 통해 비록 임플란트는 파절되었으나 생체 내에서 높은 수치의 골-임플란트 접촉 비율이 확인되었다.