- Email: [email protected]
porcelain crowns
d e n t a l m a t e r i a l s 3 0 S ( 2 0 1 4 ) e1–e180
38
37 Fatigue resistance of Y-TZP/porcelain crowns Pereira 1,2,3,∗ ,
e19
Anami 1,∗ ,
Lima 1 ,
L.C. J.M.C. S. L.F. Valandro 2 , C.J. Kleverlaan 3 , A.J. Feilzer 3 , M.A. Bottino 1 1
Univ Estatual Paulista – UNESP, Brazil Federal University of Santa Maria, Brazil 3 Academisch Centrum Tandheelkunde Amsterdam, Netherlands 2
Purpose: Following the tendency of all-ceramic crowns, Y-TZP stands out for its biomechanical properties. The literature describes several possibilities of Y-TZP surface treatment aiming to improve the adhesion to substrate, but there is still a controversy about the long-term effects of them. However, clinical studies (which do not analyze those treatments) observe that mostly failures occur cohesively in porcelain and not for lack of adhesion to the substrate. To evaluate the effects of some surface treatments and cementing agents of Y-TZP/porcelain crowns, this study evaluated the fatigue resistance in a simplified model in order to reduce bias and better study the materials themselves. Methods and materials: For this, 90 preparations were machined in epoxy resin that received Y-TZP frameworks made by CAD/CAM system and veneered by feldspathic ceramic. Six groups were tested (n = 15): PN, ZP and GI – cleaning with isopropyl alcohol; OG – overglaze applying; AO – 125 m Al2 O3 sandblasting; CJ – 30 m SiO2 sandblasting. The crowns from the ZP group were cemented with zinc phosphate and the crowns from GI group were cemented with glass ionomer, while the remaining crowns were cemented using Panavia F (Kuraray). The fatigue resistance was evaluated using stepwise stress until failure: 5k cycles at 200 N followed by 10k cycles at 800, 1000, 1200 and 1400 N. The cement thickness and failure modes were analyzed in stereomicroscope and scanning electron microscopy, and the results were statistically analyzed by Kaplan–Meier and Mantel-Cox log rank tests (5%), 1-way ANOVA and Tukey’s test and Weibull nonparametric test. Results: The adhesively cemented crowns showed higher fatigue resistance when compared to the non-adhesively crowns, but the treated crowns were also similar to the nonadhesive ones. Weibull’s analysis indicated that all specimens had a higher ratio of late to early failures. The predominantly failure mode was the chipping of the veneer. Conclusion: It can be concluded that the surface treatments didn’t influenced the fatigue resistance of Y-TZPporcelain crowns, but the adhesively luting is recommended in this case. Keywords: Fatigue resistance; Y-TZP; Surface treatments http://dx.doi.org/10.1016/j.dental.2014.08.038
Bond durability between ceramic-resin cement: Silane heat treatment effect F.P.P. Leite 1,∗ , M.G.A.M. Chaves 1 , A.P.P. Leite 1 , M.R. Duarte 1 , R.F. Carvalho 1 , R.L.A. Carvalho 2 , E.T. Kimpara 2 1
University Federal of Juiz De Fora, Brazil Institute of Science and Technology of São José Dos Campos, UNESP, Brazil
2
Purpose: To evaluate the effect of silane heat treatment on the bond durability between resin cement and feldspathic ceramic. Methods and materials: Thirty feldspathic ceramic blocks (Vita Mark II) were obtained with dimensions 12 mm × 7 mm × 5 mm and duplicated in composite resin (W3D Master, Vita). The groups were divided according to the heat treatment (n = 10): AS – 10% fluoridric acid + silane; and AST – 10% fluoridric acid + silane + heat treatment. The resin cement system Panavia F was used to cement the ceramic on the composite resin blocks, and the sets (ceramic/cement/composite) were sectioned with a precision cutting machine, resulting in 18 samples (sticks)/block, measuring 8 mm × 1 mm × 1 mm. Half of the samples of each group were aged by thermocycling (10,000 cycles: 5/55 ◦ C). All specimens were submitted to the microtensile bond strength test using a universal testing machine (EMIC). The results were evaluated using two-way ANOVA (a = 0.05). Results: There was an interaction between heat treatment and thermocycling (p = 0.001). Groups with silane heat treatment showed higher bond strength compared to the groups without heat treatment (p = 0.001). The bond strength was affected by the aging process (p = 0.001). Conclusion: The silane heat treatment increased the bond strength between feldspathic ceramic and resin cement, in both aged and non-aged conditions. Keywords: Heat treatment; Silane; Bond durability http://dx.doi.org/10.1016/j.dental.2014.08.039 39 Optimization of silane application for CAD/CAM ceramic resin bonding P. Magne 1 , G. Bruzi 2,∗ , A.O. Carvalho 3 , R. Enciso 1 , M. Giannini 4 , H.P. Maia 2 1
University of Southern California, Restorative Sciences, Los Angeles, USA 2 Federal University of Santa Catarina, Operative Dentistry, Florianópolis, Brazil 3 Feira De Santana State University, Integrated Clinical, Feira De Santana, Brazil 4 Piracicaba Dental School, State University of Campinas, Restorative Dentistry, Piracicaba, Brazil Purpose: Evaluate surface treatments and silane application and their effect on the resin-ceramic shear bond strength (SBS).
38
37 Fatigue resistance of Y-TZP/porcelain crowns Pereira 1,2,3,∗ ,
e19
Anami 1,∗ ,
Lima 1 ,
L.C. J.M.C. S. L.F. Valandro 2 , C.J. Kleverlaan 3 , A.J. Feilzer 3 , M.A. Bottino 1 1
Univ Estatual Paulista – UNESP, Brazil Federal University of Santa Maria, Brazil 3 Academisch Centrum Tandheelkunde Amsterdam, Netherlands 2
Purpose: Following the tendency of all-ceramic crowns, Y-TZP stands out for its biomechanical properties. The literature describes several possibilities of Y-TZP surface treatment aiming to improve the adhesion to substrate, but there is still a controversy about the long-term effects of them. However, clinical studies (which do not analyze those treatments) observe that mostly failures occur cohesively in porcelain and not for lack of adhesion to the substrate. To evaluate the effects of some surface treatments and cementing agents of Y-TZP/porcelain crowns, this study evaluated the fatigue resistance in a simplified model in order to reduce bias and better study the materials themselves. Methods and materials: For this, 90 preparations were machined in epoxy resin that received Y-TZP frameworks made by CAD/CAM system and veneered by feldspathic ceramic. Six groups were tested (n = 15): PN, ZP and GI – cleaning with isopropyl alcohol; OG – overglaze applying; AO – 125 m Al2 O3 sandblasting; CJ – 30 m SiO2 sandblasting. The crowns from the ZP group were cemented with zinc phosphate and the crowns from GI group were cemented with glass ionomer, while the remaining crowns were cemented using Panavia F (Kuraray). The fatigue resistance was evaluated using stepwise stress until failure: 5k cycles at 200 N followed by 10k cycles at 800, 1000, 1200 and 1400 N. The cement thickness and failure modes were analyzed in stereomicroscope and scanning electron microscopy, and the results were statistically analyzed by Kaplan–Meier and Mantel-Cox log rank tests (5%), 1-way ANOVA and Tukey’s test and Weibull nonparametric test. Results: The adhesively cemented crowns showed higher fatigue resistance when compared to the non-adhesively crowns, but the treated crowns were also similar to the nonadhesive ones. Weibull’s analysis indicated that all specimens had a higher ratio of late to early failures. The predominantly failure mode was the chipping of the veneer. Conclusion: It can be concluded that the surface treatments didn’t influenced the fatigue resistance of Y-TZPporcelain crowns, but the adhesively luting is recommended in this case. Keywords: Fatigue resistance; Y-TZP; Surface treatments http://dx.doi.org/10.1016/j.dental.2014.08.038
Bond durability between ceramic-resin cement: Silane heat treatment effect F.P.P. Leite 1,∗ , M.G.A.M. Chaves 1 , A.P.P. Leite 1 , M.R. Duarte 1 , R.F. Carvalho 1 , R.L.A. Carvalho 2 , E.T. Kimpara 2 1
University Federal of Juiz De Fora, Brazil Institute of Science and Technology of São José Dos Campos, UNESP, Brazil
2
Purpose: To evaluate the effect of silane heat treatment on the bond durability between resin cement and feldspathic ceramic. Methods and materials: Thirty feldspathic ceramic blocks (Vita Mark II) were obtained with dimensions 12 mm × 7 mm × 5 mm and duplicated in composite resin (W3D Master, Vita). The groups were divided according to the heat treatment (n = 10): AS – 10% fluoridric acid + silane; and AST – 10% fluoridric acid + silane + heat treatment. The resin cement system Panavia F was used to cement the ceramic on the composite resin blocks, and the sets (ceramic/cement/composite) were sectioned with a precision cutting machine, resulting in 18 samples (sticks)/block, measuring 8 mm × 1 mm × 1 mm. Half of the samples of each group were aged by thermocycling (10,000 cycles: 5/55 ◦ C). All specimens were submitted to the microtensile bond strength test using a universal testing machine (EMIC). The results were evaluated using two-way ANOVA (a = 0.05). Results: There was an interaction between heat treatment and thermocycling (p = 0.001). Groups with silane heat treatment showed higher bond strength compared to the groups without heat treatment (p = 0.001). The bond strength was affected by the aging process (p = 0.001). Conclusion: The silane heat treatment increased the bond strength between feldspathic ceramic and resin cement, in both aged and non-aged conditions. Keywords: Heat treatment; Silane; Bond durability http://dx.doi.org/10.1016/j.dental.2014.08.039 39 Optimization of silane application for CAD/CAM ceramic resin bonding P. Magne 1 , G. Bruzi 2,∗ , A.O. Carvalho 3 , R. Enciso 1 , M. Giannini 4 , H.P. Maia 2 1
University of Southern California, Restorative Sciences, Los Angeles, USA 2 Federal University of Santa Catarina, Operative Dentistry, Florianópolis, Brazil 3 Feira De Santana State University, Integrated Clinical, Feira De Santana, Brazil 4 Piracicaba Dental School, State University of Campinas, Restorative Dentistry, Piracicaba, Brazil Purpose: Evaluate surface treatments and silane application and their effect on the resin-ceramic shear bond strength (SBS).