Resin cement coating reverts the machining damage on the flexural fatigue strength of lithium disilicate glass-ceramic

被引:2
|
作者
May, Michele Mirian [1 ]
Machry, Renan Vaz [1 ]
Fraga, Sara [2 ,5 ]
de Andrade, Guilherme Schmitt [3 ]
Bottino, Marco Antonio [3 ]
Valandro, Luiz Felipe [4 ]
May, Liliana Gressler [4 ]
机构
[1] Univ Fed Santa Maria, Fac Odontol, Postgrad Program Dent Sci, Prosthet Dent Unit, Santa Maria, Brazil
[2] Univ Fed Rio Grande do Sul, Dept Conservat Dent, Porto Alegre, Brazil
[3] Sao Paulo State Univ, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, Brazil
[4] Univ Fed Santa Maria, Dept Restorat Dent, Santa Maria, Brazil
[5] Fed Univ Rio Grande Sul UFRGS, Dept Conservat Dent, Ramiro Barcelos St, 2492, BR-90035003 Porto Alegre, RS, Brazil
关键词
cement coating; computer-aided design; computer-aided manufacturing; dental ceramics; fatigue flexural strength; milling; strengthening; SURFACE TREATMENTS; DENTAL CERAMICS; IMPACT; PORCELAIN; PERFORMANCE; MODULUS;
D O I
10.1002/jbm.b.35206
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
This study evaluated the effect of resin cement coating with high and low viscosities on the flexural fatigue strength of machined lithium disilicate glass-ceramic. Discs (IPS e.max CAD; Ivoclar Vivadent) were prepared and divided according to the surface condition (machining [M]-CEREC inLab; and polishing [P]-laboratory procedures), resin cement coating (with or without), and cement viscosity (high [H] and low [L]). The ceramic bonding surface was etched/primed by a one-step primer application followed by resin cement application (Variolink N base + high or low viscosity catalyst; Ivoclar Vivadent). Biaxial flexural fatigue strength was evaluated on a piston-on-three-ball set by the step-test method (n = 15) (initial stress: 60 MPa; incremental steps: 20 MPa; 10,000 cycles/step, at 20 Hz). Weibull statistics were used for fatigue data. Contact angle, topographic, and fractographic analysis were also performed. Machining produced statistically lower contact angle than polishing and a significant detrimental effect on the fatigue behavior (sigma M-0 = 247.2 [246.9-268.3]; sigma P-0 = 337.4 [297.8-382.4]). Machined groups followed by resin cement coating (sigma 0MH = 297.9 [276.0-321.5]; sigma(0)Ml = 301.2 [277.1-327.4]) behaved similarly to the polished and coated groups (sigma 0PH = 342.0 [308.9-378.5]; sigma 0PL = 357.3 [324.7-393.1]), irrespective of the cement viscosity. Therefore, cement coating has able to revert the detrimental effects of the machining on the fatigue strength of lithium disilicate glass-ceramic. High and low viscosity cements behaved similarly in the improvement of CAD-CAM lithium disilicate fatigue strength.
引用
收藏
页码:971 / 980
页数:10
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