시멘트 제거를 위해 가한 열이 임플란트 티타늄 지대주와 나사에 미치는 영향
The effect of heat to remove cement on implant titanium abutment and screw
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목적: 본 연구의 목적은 임플란트 고정성 보철물의 시멘트 소환을 위해 가한 열이 임플란트 티타늄 지대주 및 지대주 나사의 풀림토크와 파절강도에 미치는 영향을 조사하는 것이다. 재료 및 방법: 임플란트와 티타늄 지대주 및 지대주 나사를 20개씩 준비하였다. 지대주와 나사는 가열하지 않은 것을 대조군으로, 진공소성로에서 450°C까지 8분간 가열 후 공기 중에서 냉각한 것을 실험군으로 분류하였다. 임플란트에 지대주 및 나사를 연결하고 30 Ncm의 힘으로 10분 간격으로 2회의 조임력을 가하고 15분 후 풀림토크를 측정하였고 만능시험기를 이용하여 지대주 나사의 파절강도를 측정하였다. 결과: 평균 풀림토크는 대조군에서 27.84 ± 1.07 Ncm, 실험군에서 26.55 ± 1.56 Ncm이었고 통계적으로 유의한 차이를 보였다 (P < .05). 평균 파절강도는 대조군에서 731.47 ± 39.46 N, 실험군에서 768.58 ± 46.73 N이었고 통계적으로 유의한 차이를 보이지 않았다 (P > .05). 결론: 임플란트 고정성 보철물의 시멘트 소환을 위해 가한 열이 티타늄 지대주 나사의 풀림토크를 유의하게 감소시켰고 파절강도에는 영향을 주지 않았다. 따라서 시멘트 소환을 위해 보철물 및 지대주의 조립체에 열을 가하는 경우에는 지대주 나사를 미리 빼내어 따로 보관하거나 부득이하게 열을 가한 지대주 나사는 재사용에 주의가 필요할 것으로 사료되나 임상적인 재사용 여부를 평가하기 위해서는 추가적인 연구가 필요하다.
Abstract
Purpose: The purpose of this study was to investigate the effect of heat applied to disintegrate cement on the removal torque value and fracture strength of titanium abutment and abutment screw. Materials and methods: Implants, titanium abutments and abutment screws were prepared for each 20 piece. Implant abutments and screws were classified as the control group in which no heat was applied and the experimental group was heated in a vacuum furnace to 450°C for 8 minutes and cooled in air. The abutments and screws were connected to the implants with 30 Ncm tightening torque at interval 10 minutes and the removal torque value was measured 15 minutes later. And the fracture strength of abutment screw was measured using universal testing machine. Results: The mean removal torque value was 27.84 ± 1.07 Ncm in the control group and 26.55 ± 1.56 Ncm in the experimental group and showed statistically significant difference (P < .05). The mean fracture strength was 731.47 ± 39.46 N in the control group and 768.58 ± 46.73 N in the experimental group and showed statistically no significant difference (P > .05). Conclusion: The heat applied for cement disintegration significantly reduced the removal torque value of the abutment screw and did not significantly affect fracture strength of the abutment screw. Therefore, in the case of applying heat to disintegrate cement it is necessary to separate the abutment screw or pay attention to the reuse of the heated screw. However further studies are needed to evaluate the clinical reuse of the heated screw.
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