Flowable 복합레진의 slumping 경향과 유변학적 성질
SLUMPING TENDENCY AND RHEOLOGICAL PROPERTY OF FLOWABLE COMPOSITES
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
본 연구의 목적은 flowable 복합레진의 조작성과 큰 연관이 있는 slumping 경향을 측정하는 방법을 제시하고 이와 관련이 있는 복합레진의 유변학적 특성을 고찰하였다. 5 종의 flowable 복합레진 (Aelitefil flow:AF, Filtek flow:FF, DenFil flow:DF, Tetric flow:TF and Revolution:RV) 이 사용되었다. 주사기에 담긴 일정량의 복합레진을 일정한 속도로 가압할 수 있는 장치를 이용하여 슬라이드글라스 위에 사출 한 후 25C의 실온에서 10 초 동안 slumping이 일어나도록 방치한 후 광중합 하였다. 복합레진의 slumping 경향을 평가하기 위해 원뿔 형 혹은 돔형으로 경화된 시편의 aspect ratio (밑면의 지름에 대한 높이의 비)를 구하였다. Slumping 경향과 복합레진의 유변학적 성질과의 관련성을 알아보기 위해 Rheometer를 사용하여 각진동수 ω=0.1-100 rad/s의 범위에서 동적진동전단시험을 시행하여 복합레진의 복소점도를 구하였다. 복합레진의 slumping 경향을 비교하기 위 해 일원분산분석 및 Turkey’s post test를 시행하였고 (α<0.05), 복소점도와 aspect ratio 사이의 관련성을 알아보기 위해 회 귀분석을 시행하였다. 결과는 다음과 같다. 1. Slumping 후 aspect ratio를 측정하여 비교한 flowable 복합레진의 slumping 경향은 제품에 따라 큰 차이를 보였다 (AF <FF < DF<TF < RV, P<0.05). 2. Flowable 복합레진은 전단률이 증가함에 따라 점도는 감소하는 pseudoplasticity를 보였고 그 경향은 AF가 가장 컸고 RV가 가장 낮았다. 3. Slumping 저항성은 복소점도가 증가함에 따라 증가하였다. 4. Aspect ratio에 바탕을 둔 slumping 경향의 측정방법은 임상에서 flowable 복합레진의 선택과 새로 개발된 재료의 평가에 유용할 것으로 사료된다.
Abstract
The aim of this study was to develop a method for measuring the slumping resistance of flowable resin composites and to evaluate the efficacy using rheological methodology. Five commercial flowable composites (Aelitefil flow:AF, Filtek flow:FF, DenFil flow:DF, Tetric flow:TF and Revolution:RV) were used. Same volume of composites in a syringe was extruded on a glass slide using a custom-made loading device. The resin composites were allowed to slump for 10 seconds at 25°C and light cured. The aspect ratio (height/diameter) of cone or dome shaped specimen was measured for estimating the slumping tendency of composites. The complex viscosity of each composite was measured by a dynamic oscillatory shear test as a function of angular frequency using a rheometer. To compare the slumping tendency of composites, one way-ANOVA and Turkey’s post hoc test was performed for the aspect ratio at 95% confidence level. Regression analysis was performed to investigate the relationship between the complex viscosity and the aspect ratio. The results were as follows. 1. Slumping tendency based on the aspect ratio varied among the five materials (AF <FF < DF<TF<RV). 2. Flowable composites exhibited pseudoplasticity in which the complex viscosity decreased with increasing frequency (shear rate). AF was the most significant, RV the least. 3. The slumping tendency was strongly related with the complex viscosity. Slumping resistance increased with increasing the complex viscosity. The slumping tendency could be quantified by measuring the aspect ratio of slumped flowable composites. This method may be applicable to evaluate the clinical handling characteristics of flowable composites.
참고문헌 (17)
- Bayne SC, "A characterization of first generationflowable composites", J Am Dent Assoc, 129, pp.567~577 (1998)
- Craig RG, "Restorative dental materials", pp.91~98 (2002), Mosby Co
- Lee IB, "Rheological properties of flowable, conventional hybrid, and condensable composite resins", Dent Mater, 19, pp.298~307 (2003)
- Summitt JB, "Fundamentals of operative dentistry: A contemporary approach", pp.319~323 (2006), Quintessence books
- Jackson RD, "The new posterior resins and a simplified placement technique", JADA, 131, pp.375~383 (2000)
- Leinfelder KF, "A report on a new condensable composite resin", Compendium, 19(3), pp.230~237 (1998)
- Al-Sharaa KA, "Stickiness prior to setting of some light cured resin composites", Dent Mater, 19, pp.182~187 (2003)
- Lee IB, "Slumping resistance and viscoelasticity prior to setting of dental composites", Dent Mater, 24, pp.1586~1593 (2008)
- Opdam NJM, "Consistency of resin composites for posterior use", Dent Mater, 12, pp.350~354 (1996)
- Tyas MJ, "The evaluation of resin composite consistency", Dent Mater, 14, pp.424~428 (1998)
- Lee IB, "Rheological characterization of composites using a vertical oscillation rheometer", Dent Mater, 23, pp.425~432 (2006)
- Beun S, "Rheological properties of flowable resin composites and pit and fissure sealants", Dent Mater, 24, pp.548~555 (2008)
- "The Korean society of rheology. Rheology and its application", pp.9~103 (2001)
- Barnes HA, "An introduction to rheology", pp.64~73 (1989), Elsevier Science Publishing Co
- Lee JH, "Rheological properties of resin composites according to variations in monomer and filler composition", Dent Mater, 22, pp.515~526 (2006)
- Kim SW, "Rheological properties of fumed silica filled Bis-GMA dispersions", Polymer Eng and Sci, 38, pp.1142~1148 (1998)
- Ellakwa A, "The effect of resin matrix composition on the polymerization shrinkage and rheological properties of experimental dental composites", Dent Mater, 23, pp.1229~1235 (2007)