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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Thickness of Ceramic Veneers on Color Stability and Bond Strength of Resin Luting Cements Containing Alternative Photoinitiators

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Author(s):
Castellanos, Mauricio [1] ; Delgado, Alex Jose [2] ; Coelho Sinhoreti, Mario Alexandre [3] ; Ramos Salles de Oliveira, Dayane Carvalho [3] ; Abdulhameed, Nader [2, 4] ; Geraldeli, Saulo [2] ; Roulet, Jean-Francois [2, 5]
Total Authors: 7
Affiliation:
[1] Univ Florida, Dept Restorat Dent Sci, Div Prosthodont, Gainesville, FL 32610 - USA
[2] Univ Florida, Dept Restorat Dent Sci, Div Operat Dent, Gainesville, FL 32610 - USA
[3] Univ Estadual Campinas, Piracicaba Dent Sch, Dent Mat Div, Dept Restorat Dent, Piracicaba, SP - Brazil
[4] Lake Erie Sch Dent Med, Restorat Dent, Bradenton, FL - USA
[5] Univ Florida, Dept Restorat Dent Sci, Ctr Biomat, Gainesville, FL 32610 - USA
Total Affiliations: 5
Document type: Journal article
Source: Journal of Adhesive Dentistry; v. 21, n. 1, p. 67-76, JAN-FEB 2019.
Web of Science Citations: 0
Abstract

Purpose: To evaluate the light transmittance of ceramic veneers of different thicknesses and verify their influence on the degree of conversion, color stability, and dentin bond strength of light-curing resin cements containing different photoinitiator systems. Materials and Methods: Experimental resin cements were fabricated containing camphorquinone and amine (CQ-amine), TPO, Ivocerin (IVO), or TPO and Ivocerin (TPO-IVO). All photoinitiators were characterized by UV-Vis spectro-photometry. Disk-shaped lithium disilicate ceramic specimens that were 0.4, 0.7, and 1.5 mm in thickness were prepared using IPS e.max Press (Ivoclar Vivadent, shade LT/A2). Light transmittance through each specimen was measured using spectrophotometry. Specimens of each cement (n = 10) were made in a custom-designed mold and were light cured through each glass-ceramic disk using a multiwave LED (Bluephase G2, Ivoclar Vivadent). CS was evaluated using spectrophotometry before and after artificial aging with UV light. DC was evaluated using FTIR-spectroscopy. Dentin mu SBS was evaluated using 0.75-mm-thick specimens that were light cured under the same protocol (n = 10). All data were submitted to two-way ANOVA and Tukey's test (alpha = 0.05; beta = 0.2). Results: CQ-amine cements showed the highest color changes (p < 0.05) due to increased yellowing when compared to the amine-free cements (p < 0.05). However, all cements showed a significant color change after aging when cured through ceramics up to 1.5 mm thick (p < 0.05). The TPO-IVO cement showed the highest DC and the IVO cement showed a similar DC when compared to the CQ-amine cement. The TPO cement presented the lowest DC (p = 0.0377). No differences in mean dentin mu SBS were found among the cements, except for the TPO cement, which presented a lower mean dentin mu SBS (p = 0.0277). Conclusion: Amine-free cements containing Ivocerin and TPO seem to be a better alternative to CQ-amine cements, while not reducing either DC or dentin mu SBS of amine-free cements. However, CQ-amine and amine-free cements still seem to change color over time. (AU)

FAPESP's process: 16/05823-3 - LOW INTENSITY LIGHT-CURING UNITS AND PHOTOINITIATION SYSTEMS ACTIVATED UNDER WAVELENGHS IN BETWEEN 495-750 NM FOR DENTAL RESIN MATERIALS
Grantee:Dayane Carvalho Ramos Salles de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral