[논문]지르코니아와 레진나노세라믹 임플란트 지대주의 두께에 따른 열순환 후 파절저항

이정원; 차현석; 이주희

doi:10.4047/jkap.2017.55.2.144

지르코니아와 레진나노세라믹 임플란트 지대주의 두께에 따른 열순환 후 파절저항
Fracture resistance of zirconia and resin nano ceramic implant abutments according to thickness after thermocycling 원문보기

대한치과보철학회지 = The journal of Korean academy of prosthodontics, v.55 no.2, 2017년, pp.144 - 150

이정원 (울산대학교 의과대학 서울아산병원 치과보철과) , 차현석 (울산대학교 의과대학 서울아산병원 치과보철과) , 이주희 (울산대학교 의과대학 서울아산병원 치과보철과)

초록
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목적: 이 연구의 목적은 심미적인 임플란트 지대주의 종류와 두께에 따른 파절 강도를 측정하여 구강 내 저작압에 견디는 최소한의 두께를 평가하기 위함이다. 재료 및 방법: 대조군으로 0.5 mm 두께의 티타늄 임플란트 지대주를(Ti-0.5), 실험군으로 지르코니아 임플란트와 레진 나노 세라믹 지대주를 사용하여 각각 0.5 mm, 0.8 mm, 1.0 mm 두께로 각 그룹에 10개씩 총 70개의 시편을 제작하였다(그룹Zir-0.5, Zir-0.8, Zir-1.0, RNC-0.5, RNC-0.8, RNC-1.0). 모든 시편은 파절 실험 이전에 열순환을 시행하여 구강 내에서의 사용을 재현한 후, universal testing machine을 이용하여 각 시편의 파절 강도를 측정하여 평균값을 측정하였다. 그룹들의 평균 파절 값을 측정하였으며 이원분산분석을 이용하여 통계학적으로 분석하였다. 결과: Zir-1.0군이 가장 높은 파절 강도 $2,476.3{\pm}342.0N$를 보였으며 뒤를 이어 Zir-0.8 ($1,518{\pm}347.9N$), Ti-0.5 ($1,041.8{\pm}237.2N$), Zir-0.5 ($631.4{\pm}149.0N$), 의 순이었다. RNC 그룹의 경우에 Ti와 Zir 그룹에 비교하여 유의하게 낮은 파절 강도값을 나타내었으며(RNC-1.0 $427.5{\pm}72.1$, RNC-0.8 $297.9{\pm}41.2$), 모든 실험군에서 지대주 두께가 감소할수록 파절 강도 값도 유의하게 감소했다(P < .01). RNC-0.5 ($127.4{\pm}35.3N$) 그룹은 다른 모든 군에 비해 유의하게 낮은 값을 보였다(P < .05). 결론: 이번 실험에서 사용된 모든 두께의 지르코니아 지대주는 전치부와 구치부의 교합압을 견딜 수 있는 정도의 파절 강도를 보여주었다. 레진 나노 세라믹 지대주의 경우 0.8 mm 두께 이상에서 전치부의 교합압을 견딜 수 있는 가능성을 보여주었다.

Abstract ▼ AI-Helper

Purpose: The aim of this in vitro study is to investigate load bearing capacity of esthetic abutments according to the type of material and wall thickness. Materials and methods: 70 specimens equally divided into seven groups according to their abutment wall thicknesses. The abutments prepared with titanium 0.5 mm wall thickness were used as a control group (Ti-0.5), whereas zirconia abutments and resin nano ceramic abutments with wall thickness 0.5 mm, 0.8 mm and 1.0 mm were prepared as test groups (Zir-0.5, Zir-0.8, Zir-1.0 and RNC-0.5, RNC-0.8, RNC-1.0). All specimens were tested in a universal testing machine to evaluate their resistance to fracture and all of them underwent thermo-cycling before loading test. Mean fracture values of the groups were measured and statistical analyses were made using two-way ANOVA. Results: Zir-1.0 showed the highest mean strength ($2,476.3{\pm}342.0N$) and Zir-0.8 ($1,518{\pm}347.9N$), Ti-0.5 ($1,041.8{\pm}237.2N$), Zir-0.5 ($631.4{\pm}149.0N$) were followed. The strengths of RNC groups were significantly lower compared to other two materials (RNC-1.0 $427.5{\pm}72.1$, RNC-0.8 $297.9{\pm}41.2$) and the strengths of all the test groups decreased as the thickness decreases (P < .01). RNC-0.5 ($127.4{\pm}35.3N$) abutments were weaker than all other groups (P < .05). Conclusion: All tested zirconia abutments have the potential to withstand the physiologic occlusal forces in anterior and posterior regions. In resin nano ceramic abutments, wall thickness more than 0.8 mm showed the possibility of withstanding the occlusal forces in anterior region.

주제어

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문제 정의

The aim of this investigation was to determine the minimal wall thickness of zirconia abutment that can withstand physiologic occlusal forces and explore the possibility of the resin-based materials as esthetic implant abutment alternatives as well.

제안 방법

6 mm and the top of the abutment was flat. The abutments representing each group (0.5, 0.8, 1.0 mm wall thickness) were fabricated according to the above mentioned thicknesses using a light-cured resin (Visio-FORM, 3M ESPE, Seefeld, Germany). The dimensions of the abutments were controlled using a precise thickness-measuring device (Digitmatic Micrometer, Mitsutoyo, Hamamatsu, Japan).
The test method used in this study was static loading, so cyclic loading with fatigue might yield different results. The lowest mean strength of zirconia 0.
To simulate aging, the specimens underwent 10,000 cycles of thermo-cycling (KR/DTRC-640, JEIO TECH, Seoul, Korea) between two water baths; 5°C and 55°C for 30 seconds each, with an intermediate pause of 15 seconds.

대상 데이터

According to the manufacturers, Lava Ultimate is another new material for CAD/CAM technique. As introduced by its manufacturer, this material is called Resin Nano Ceramic (RNC) that is composed of approximately 80% nano ceramic filler (silica and zirconia) and 20% resin matrix.
Seventy implant abutments and fixtures (TiU, Nobel Biocare Inc., Zürich-Flughafen, Switzerland) with a diameter of 4 mm external hex were used in this study.

데이터처리

001). Also a two-way ANOVA was performed to assess whether there is an interaction effect between material and thickness. The statistical software SPSS 12.
The distribution of strength was satisfied with normality assumption (result of the Shapiro-Wilk's test, P > .05) and a parametric method one-way analysis of variance (ANOVA) was used.

성능/효과

^18,19 In an in vitro study, unprepared titanium-reinforced zirconia showed median fracture load of 294 N and Ti control groups 324 N respectively, after fatigue and static loadings.¹⁸ The conclusion of that study was that titanium-reinforced zirconia abutment performed almost the same manner to titanium abutment, so it can be recommended as an aesthetic substitute for single implant abutment in anterior region.
The main finding of this study was that all the zirconia abutments tested including 0.5 mm wall thickness have the potential to withstand the physiologic occlusal forces in anterior and posterior regions of oral cavity.

후속연구

8 mm showed the possibility to withstand the occlusal forces in anterior regions. As the results of this study cannot be generalized to other implant system, further studies are needed to verify the minimal wall thickness of implant abutments.
8 mm. As well known, to succeed as a dental implant abutment, in many aspects, not only the mechanical strengths like fracture strength but also the bio-physiological compatibility including subgingival area should be proved Additional further studies about resistance to persistent stress using cyclic loading and screw loosening due to resin nano ceramic material will be needed. And longitudinal clinical evaluations including fracture and discoloration etc.

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