Mechanical Properties and Microstructure of the Leucite-Reinforced Glass-Ceramics for Dental CAD/CAM
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The computer-aided design/computer-aided manufacturing (CAD/CAM) system was introduced to shorten the production time of all-ceramic restorations and the number of patient visits. Among these types of ceramic for dental CAD/CAM, they have been processed into inlay, onlay, and crown shapes using leucite-reinforced glass-ceramics to improve strength. The purpose of this study was to observe the mechanical properties and microstructure of leucite-reinforced glass-ceramics for dental CAD/CAM. Two types of leucite-reinforced glass-ceramic blocks (IPS Empress CAD, Rosetta BM) were prepared with diameter of 13 mm and thickness of 1 mm. Biaxial flexural testing was conducted using a piston-on-three-ball method at a crosshead speed of 0.5 mm/min. Weibull statistics were used for the analysis of biaxial flexural strength. Fracture toughness was obtained using an indentation fracture method. Specimens were observed by field emission scanning electron microscopy to examine the microstructure of the leucite crystalline phase after acid etching with 0.5% hydrofluoric acid aqueous solution for 1 minute. The results of strength testing showed that IPS Empress CAD had a mean value of 158.1±8.6 MPa and Rosetta BM of 172.3±8.3 MPa. The fracture toughness results showed that IPS Empress CAD had a mean value of 1.28±0.19 MPa·m1/2 and Rosetta BM of 1.38±0.12 MPa·m1/2. The Rosetta BM sample exhibited higher strength and fracture toughness. Moreover, the crystalline phase size and ratio were increased in the Rosetta BM sample. The above results are expected to elucidate the basic mechanical properties and crystal structure characteristics of IPS Empress CAD and Rosetta BM. Additionally, they will help develop leucite-reinforced glass-ceramic materials for CAD/CAM.
Abstract
The computer-aided design/computer-aided manufacturing (CAD/CAM) system was introduced to shorten the production time of all-ceramic restorations and the number of patient visits. Among these types of ceramic for dental CAD/CAM, they have been processed into inlay, onlay, and crown shapes using leucite-reinforced glass-ceramics to improve strength. The purpose of this study was to observe the mechanical properties and microstructure of leucite-reinforced glass-ceramics for dental CAD/CAM. Two types of leucite-reinforced glass-ceramic blocks (IPS Empress CAD, Rosetta BM) were prepared with diameter of 13 mm and thickness of 1 mm. Biaxial flexural testing was conducted using a piston-on-three-ball method at a crosshead speed of 0.5 mm/min. Weibull statistics were used for the analysis of biaxial flexural strength. Fracture toughness was obtained using an indentation fracture method. Specimens were observed by field emission scanning electron microscopy to examine the microstructure of the leucite crystalline phase after acid etching with 0.5% hydrofluoric acid aqueous solution for 1 minute. The results of strength testing showed that IPS Empress CAD had a mean value of 158.1±8.6 MPa and Rosetta BM of 172.3±8.3 MPa. The fracture toughness results showed that IPS Empress CAD had a mean value of 1.28±0.19 MPa·m1/2 and Rosetta BM of 1.38±0.12 MPa·m1/2. The Rosetta BM sample exhibited higher strength and fracture toughness. Moreover, the crystalline phase size and ratio were increased in the Rosetta BM sample. The above results are expected to elucidate the basic mechanical properties and crystal structure characteristics of IPS Empress CAD and Rosetta BM. Additionally, they will help develop leucite-reinforced glass-ceramic materials for CAD/CAM.
참고문헌 (29)
- Yoshimura HN, "Relationship between elastic and mechanical properties of dental ceramics and their index of brittleness", Ceram Int, 38, pp.4715~4722 (2012)[DOI]
- Ritzberger C, "Properties and clinical application of three types of dental glass-ceramics and ceramics for CAD-CAM technologies", Materials (Basel), 3, pp.3700~3713 (2010)[DOI]
- 김기백, "저온열화현상이 지르코니아 코어와 전장도재의 전단결합강도에 미치는 영향", 치위생과학회지, 14(1), pp.29~34 (2014), 한국치위생과학회
- MacCulloch WT, "Advances in dental ceramics", Br Dent J, 124, pp.361~365 (1968)
- McLean JW, "Evolution of dental ceramics in the twentieth century", J Prosthet Dent, 85, pp.61~66 (2001)[DOI]
- Sakaguchi RL, "Craig's restorative dental materials", pp.455~462 (2012), Elsevier Mosby
- Holand W, "Glass-ceramic technology" (2012), Wiley
- Kramer N, "Clinical performance of bonded leucite-reinforced glass ceramic inlays and onlays after eight years", Dent Mater, 21, pp.262~271 (2005)[DOI]
- Miyazaki T, "A review of dental CAD", CAM: current status and future perspectives from 20 years of experience, 2009, pp.28, 44~56
- Trost L, "Making informed decisions about incorporating a CAD", CAM system into dental practice, 2006, pp.137(Suppl), 32S~36S
- Chen X, "Crystallization and flexural strength optimization of fine-grained leucite glass-ceramics for dentistry", Dent Mater, 27, pp.1153~1161 (2011)[DOI]
- Quinn GD, "Chipping fracture resistance of dental CAD", CAM restorative materials: part I--procedures and results, 2014, pp.30, e99~e111
- Chen YM, "Translucency and biaxial flexural strength of four ceramic core materials", Dent Mater, 24, pp.1506~1511 (2008)[DOI]
- Anstis GR, "A critical evaluation of indentation techniques for measuring fracture toughness: I, Direct crack measurements", J Am Ceram Soc, 64, pp.533~538 (1981)[DOI]
- 임용운, "치과 보철", 수복재료의 기계적 특성에 대한 규격화 시험법과 응용, 2015, pp.42(3), 259~270[DOI]
- Alkadi L, "Fracture toughness of two lithium disilicate dental glass ceramics", J Prosthet Dent, 116, pp.591~596 (2016)[DOI]
- 신천호, "지르코니아 코어의 표면처리 방법에 따른 도재 축성의전단결합강도", 치위생과학회지, 13(4), pp.487~492 (2013), 한국치위생과학회
- 김기백, "Lithium Disilicate (IPS e.max CAD) 코어와 전장 도재 사이의 전단결합강도에 관한 연구", 치위생과학회지, 13(3), pp.290~295 (2013), 한국치위생과학회
- Chen C, "The fracture resistance of a CAD", CAM Resin Nano Ceramic (RNC) and a CAD ceramic at different thicknesses, 2014, pp.30, 954~962
- Song XF, "Surface morphology and fracture in handpiece adjusting of a leucite-reinforced glass ceramic with coarse diamond burs", Mater Sci Eng: A, 534, pp.193~202 (2012)[DOI]
- Teixeira EC, "Dynamic fatigue and strength characterization of three ceramic materials", J Mater Sci Mater Med, 18, pp.1219~1224 (2007)[DOI]
- Zeng K, "Flexure tests on dental ceramics", Int J Prosthodont, 9, pp.434~439 (1996)
- Ban S, "Influence of test method on failure stress of brittle dental materials", J Dent Res, 69, pp.1791~1799 (1990)[DOI]
- Passos SP, "In vitro fracture toughness of commercial Y-TZP ceramics: a systematic review", J Prosthodont, 24, pp.1~11 (2015)[DOI]
- Lin WS, "The effect of core material, veneering porcelain, and fabrication technique on the biaxial flexural strength and weibull analysis of selected dental ceramics", J Prosthodont, 21, pp.353~362 (2012)[DOI]
- Bona AD, "Weibull analysis and flexural strength of hot-pressed core and veneered ceramic structures", Dent Mater, 19, pp.662~669 (2003)[DOI]
- McCabe JF, "A statistical approach to the mechanical testing of dental materials", Dent Mater, 2, pp.139~142 (1986)[DOI]
- Della Bona A, "Fracture behavior of lithia disilicate-and leucite-based ceramics", Dent Mater, 20, pp.956~962 (2004)[DOI]
- Harrer W, "Influence of surface defects on the biaxial strength of a silicon nitride ceramic: increase of strength by crack healing", J Eur Ceram Soc, 32, pp.27~35 (2012)[DOI]