Effect of zinc chloride added to self-etching primer on bond strength to caries-affected dentin and chemical-physical-mechanical properties of adhesives |
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| Affiliation: | 1. Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas, São Paulo, Brazil;2. Federal University of Alagoas, Maceió, Brazil;3. Institute of Science and Technology of São José Dos Campos, UNESP - Universidade Estadual Paulista, São José Dos Campos, São Paulo, Brazil;1. Department of Pathogenic Biology and Immunology, School of Basic Medical Sciences, Xi''an Jiaotong University Health Science Center, Xi''an, Shaanxi, China;2. Clinical Laboratory, Tianjin Medical University General Hospital, Tianjin, China;3. Clinical Laboratory, The Second Affiliated Hospital of Xi''an Jiaotong University, Xi''an, Shaanxi, China;4. Department of Ophthalmology, Xi''an No. 4 Hospital, Xi''an, Shaanxi, China;5. Clinical Laboratory, Xi''an Gaoxin Hospital, Xi''an, Shaanxi, China;1. Materials Chemistry and Sensors Laboratories, Department of Chemistry, State University of Maringa, Colombo Avenue, 5790, Maringá, PR, Brazil;2. Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Limeira Avenue, 901, Piracicaba, SP, Brazil;3. Division of Biomaterials and Biomechanics, School of Dentistry, Oregon Health and Science University, 2730 SW Moody Avenue, Portland, OR, United State;4. Department of Physics, State University of the Midwest, Simeao Camargo Varela de Sá Street, 03, Guarapuava, PR, Brazil;5. Department of Pharmacy, State University of the Midwest, Simeao Camargo Varela de Sá Street, 03, Guarapuava, PR, Brazil;1. Department of Biochemistry, Federal University of São Paulo, São Paulo, Brazil;2. Biotechnology and Innovation in Health Program, Universidade Anhanguera de São Paulo (UNIAN-SP), São Paulo, SP, Brazil;3. Interdisciplinary Center of Biochemistry Investigation, University of Mogi das Cruzes, Mogi das Cruzes, SP, Brazil;1. São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil;2. Ceuma Universty, São Luís, Maranhão, Brazil;3. Instituto Florence de Ensino Superior, São Luís, Maranhão, Brazil;1. Department of Restorative Dentistry, Araçatuba School of Dentistry, São Paulo State University, 1193 José Bonifácio St, Araçatuba, SP, 16015-050, Brazil;2. Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University, 1193 José Bonifácio St, Araçatuba, SP, 16015-050, Brazil;3. Department of Aerospace Science and Technology, Photonics Division – Lasers, Institute of Advanced Studies of São José dos Campos - IEAv, Coronel Aviador José Alberto Albano do Amarante clover, 01 – Putim, São José dos Campos, SP, 12228-001, Brazil;4. Department of Restorative Dentistry, Science and Technology Institute of São José dos Campos, São Paulo State University – UNESP, 777 Eng. Francisco José Longo Av, Jardim Sao Dimas, São José dos Campos, SP, 12245-000, Brazil;5. Department of Restorative Dentistry, Faculty of Dentistry, University of Toronto, 124 Edward St, Toronto, ON M5G 1G6, Canada;1. Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil;2. Radboud University Medical Center, Department of Dentistry, Nijmegen, The Netherlands |
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| Abstract: | The aim of this in vitro study was to evaluate the effect over time of zinc chloride (ZnCl2) incorporated into the primer of a two-step self-etching adhesive system (Clearfil SE Bond, Kuraray - SE) on long-term microtensile bond strength (μTBS) to caries-affected dentin (CAD), and on flexural strength (FS) and conversion degree (CD) of the adhesive. First, the CD of SE with and without 2% (wt) ZnCl2 solution was evaluated by Fourier transform infrared spectroscopy (FTIR). Then, beam-shaped samples (7 mm × 2 mm x 1 mm) were prepared with the SE primer containing the ZnCl2 solution, to perform flexural strength (FS) tests. For μTBS testing purposes, CAD surfaces were randomly divided into two groups, according to the presence of ZnCl2 powder (2 wt%) incorporated into the adhesive system (ZnCl2), or its absence (NT). An additional group consisting of dentin pretreated with a 2% chlorhexidine digluconate (CHX) solution was proposed as a positive control (n = 10). A two-step self-etching system (SE) was applied following the manufacturer's instructions, and restorations of composite resin were built up on the dentin. After 24 h, the resin-dentin blocks were sectioned into specimens that were submitted to μTBS testing immediately following, or after 12 months of water storage (WS). Both μTBS and FS tests were performed using a universal testing machine (0.5 mm/min). FS and CD data were submitted to the Student t-test, and μTBS data were submitted to two-way ANOVA and Tukey's test (α = 0.05). ZnCl2 incorporation had no statistically significant influence on flexural strength (p = 0.88) or conversion degree (p = 566). Regarding μTBS, no significant effect of the double interaction of “dentin treatment” versus “WS period” (p = 0.546) was observed. The bond strength was not affected by the WS period (p = 0.805). The highest mean bond strength was observed for the NT group, which did not differ from the ZnCl2 group. The lowest mean bond strength was observed for the CHX group, which differed statistically from the NT group (p = 0.053). It was concluded that incorporation of ZnCl2 into the SE self-etching primer did not interfere in the bond strength of caries-affected dentin, in regard to failure mode, flexural strength or CD, and had no other beneficial effects. |
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| Keywords: | Bond strength Zinc Dentinal adhesive |
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