Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
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Joint stability of internal conical connection abutments with or without hexagon indexes: an in vitro study

내부연결 원추형 임플란트의 육각구조의 유무에 따른 연결부 안정성: 실험적 연구

  • Lee, Sang-Woon (Department of Dentistry, Gangneung Asan Hospital, University of Ulsan, College of Medicine) ;
  • Cha, Min-Sang (Department of Dentistry, Gangneung Asan Hospital, University of Ulsan, College of Medicine) ;
  • Lee, Ji-Hye (Department of Prosthodontics and Research Institute of Oral Science, Gangneung-Wonju National University) ;
  • Cho, Lee-Ra (Department of Prosthodontics and Research Institute of Oral Science, Gangneung-Wonju National University) ;
  • Park, Chan-Jin (Department of Prosthodontics and Research Institute of Oral Science, Gangneung-Wonju National University)
  • 이상운 (울산대학교 의과대학 강릉아산병원 치과) ;
  • 차민상 (울산대학교 의과대학 강릉아산병원 치과) ;
  • 이지혜 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 조리라 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 박찬진 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소)
  • Received : 2020.05.27
  • Accepted : 2020.05.28
  • Published : 2020.06.30
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Abstract

Purpose: The purpose of this study was to compare the axial displacement of the hexagonal and conical abutment in internal conical connection implant after screw tightening and cyclic loading. Materials and Methods: Internal conical connection implants were divided into two groups (n = 10): group HEX, hexagonal abutment; and group CON, conical 2-piece abutments. The axial displacement and removal torque values were measured after 30 Ncm torque tightening and 250N loading test of 100,000 cycles. The Student t test with 5% significance level was used to evaluate the data. Results: HEX group demonstrated significantly higher axial displacement values after 30 Ncm tightening in comparison to the CON group (P < 0.05). No significant difference was found in axial displacement after cyclic loading (P = 0.052). Removal torque loss before and after the cyclic loading both revealed no significant difference between groups (P = 0.057 and P = 0.138). Removal torque value decreased after cyclic loading in both groups (P < 0.05). Conclusion: Overall, both abutment with or without hexagon index presented similar biomechanical performance except HEX group demonstrated significantly more axial displacement after applying tightening torque.

목적: 본 연구의 목적은 내부연결 원추형 임플란트의 육각구조 유무가 임플란트 지대주 장축변위와 임플란트 지대주 나사의 풀림토크에 미치는 영향을 평가하고자 하였다. 연구 재료 및 방법: 내부연결 원추형 임플란트를 육각구조를 가진 지대주 그룹(HEX)과 육각구조를 갖지 않는 지대주 그룹(CON)으로 나누고 각 그룹 당 10쌍의 시편을 체결하였다. 지대주 나사를 30 Ncm 조임회전력을 가하여 체결한 뒤 장축변위 및 풀림토크값을 측정하고 250 N 수직적 반복하중을 100,000회 가한 뒤 장축변위 및 풀림토크값을 측정하였다. 각 단계마다 디지털 마이크로미터를 이용하여 임플란트 직경과 수직적 높이를 측정하였고 전자 토크게이지를 이용하여 풀림토크값을 측정하였다. 각 군간의 값의 유의차를 확인하기 위하여 독립 표본 T 검정을 이용하여 통계분석하였다(α = 0.05). 결과: HEX 군은 조임회전력을 가한 뒤 유의하게 높은 장축변위를 나타내였다(P < 0.05). HEX 군과 CON 군은 수직적 반복하중 후 장축변위에 유의한 차이를 보이지 않았다(P = 0.052). HEX 군과 CON 군은 수직적 반복하중 전, 후 풀림토크값 모두 유의한 차이를 보이지 않았다(P = 0.057 and P = 0.138). 모든 그룹에서 반복하중 후 풀림토크값 상실율이 증가하였다(P < 0.05). 결론: 내부연결 원추형 임플란트에서 육각구조를 가진 경우 장축 변위가 더 컸으며, 그 외의 연결부 안정성은 유사하였다. 모든 그룹에서 반복하중 후 풀림토크값 상실율이 증가하였다.

Keywords

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