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Effect of different artificial aging methods on the durability of the bond strength of laser- treated zirconia to a resin cement

Grant number: 17/17808-1
Support Opportunities:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): October 30, 2017
Effective date (End): October 29, 2018
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Ana Cecília Corrêa Aranha
Grantee:Stephanie Assimakopoulos Garófalo
Supervisor: Marcella Esteves Oliveira
Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: RWTH Aachen University, Germany  
Associated to the scholarship:16/20935-2 - Immediate and long-term microtensile bond strength of a resin cement to zirconia ceramic after ultra-short pulsed laser treatment, BP.DD


The treatment of zirconia ceramic surfaces with ultrashort pulse lasers irradiation has shown significantly higher short-term adhesion to a dual-cure cement than other available methods. Although the results for this method of conditioning are quite promising, further studies with long-term evaluation of this bonding are necessary to prove the durability of this adhesion. Therefore, the objectives of the study will be to evaluate the effect of different aging conditions on the long-term microtensile bond strength of ultra-short pulse laser treated zirconia ceramic to a dual resin cement. Fifty blocks of 10x10x5 mm3 will be cut and polished (400 to 1200 silicon carbide disks) from the zirconia reinforced ceramic material. The samples will then be irradiated by a picosecond laser (Yb:YAG, 9W, 800kHz, 6 ps per pulse). Each ceramic block will be duplicated in composite resin, and a silane coupling agent will be then applied to the blocks. The ceramic and composite resin blocks will be then joined as pairs using a composite resin luting system under a load of 15N for 10 Min. They will be then light polymerized. Twelve to fourteen bars of approximately 1.0mm2 in cross-section will be obtained from each half of one block. The peripheral slices will be disregarded. After that, the blocks will be randomly distributed into five groups (n=10): Negative Control (NC), Thermal cycling with 10,000 cycles - positive control (T10), Thermal cycling with 20,000 cycles (T20), Water storage for 6 months (WS), and Thermal and mechanical cycling (TM). For the microtensile test, a 100N voltage and load speed of 0.5 mm/min until failure will be determined. The obtained data regarding µTBS will be statistically analyzed to test the study hypotheses. Normal distribution of the data will be tested using the Kolmogorov-Smirnov test (0.05) and in case this is confirmed the analysis of variance (ANOVA) and post hoc comparisons by means of the Tukey test will be performed. If normal distribution hypothesis is rejected non-parametric tests will be used for the group comparisons. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GAROFALO, STEPHANIE ASSIMAKOPOULOS; WEHNER, MARTIN; DOHRN, ANDREAS; BILANDZIC, MARIN DEAN; ROOS, CHRISTIAN; WIERICHS, RICHARD JOHANNES; MEYER-LUECKEL, HENDRIK; ARANHA, ANA CECILIA CORREA; ESTEVES-OLIVEIRA, MARCELLA. ncreasing dental zirconia micro-retentive aspect through ultra-short pulsed laser microstructuring: study on flexural strength and crystal phase characterizatio. CLINICAL ORAL INVESTIGATIONS, v. 26, n. 1, . (16/20935-2, 17/17808-1)

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