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APPLICATION STRATEGIES OF UNIVERSAL ADHESIVE SYSTEM ON DURABILITY OF RESTORATIVE MATERIALS OBTAINED BY CAD CAM TO DENTIN.

Objectives: The objective of this study was to evaluate the influence of the application of the universal adhesive system (Scotchbond Universal 3M/ESPE) to the dentin on the strength and bonding durability of a ceramic based on lithium disilicate and a nanoceramic resin by the micro-shear test.
Methods: A total of 40 healthy third molars, sectioned to expose flat occlusal medium dentin and separated into 4 groups (n = 10) were selected according to dentin treatments (application of phosphoric acid prior to universal Scotchbond Universal adhesive or not) and indirect materials obtained by CAD CAM (lithium disilicate ceramics - IPS e.max CAD and nanoceramic resin - Lava Ultimate). Ceramic sticks of lithium disilicate and nanoceramic resin with 1 mm2 of area were cemented with resin cement Rely XTM Ultimate on the dentin surface and stored in distilled water for 48h or 12 months at 37oC. The micro-shear test was performed in a Universal Assay machine at a speed of 0.5 mm / min.
Results: The values were recorded in MPa and submitted to analysis of variance at three criteria with significance level of 5%. The results indicated that the interaction between restorative material, dentin treatment and time was not significant (p = 0.841). However, the storage time significantly affected the bond strength (p = 0.016), and for all the groups, the values of union strength were verified after 12 months.
Conclusions: It was concluded that, regardless of the mode of application of the universal adhesive system and the type of restorative material, the bond strength to the dentin decreased over time.
Division: Latin American Region Meeting
Meeting: 2018 Latin American Region Meeting (Montevideo, Uruguay)
Location: Montevideo, Uruguay
Year: 2018
Final Presentation ID:
Abstract Category|Abstract Category(s): Dental Materials 1: Ceramic-based Materials
Authors
  • Lima, Eva  ( Centro de Pesquisas Odontológicas Snao Leopoldo Mandic , Manaus , Amazonas , Brazil ;  Universidade Federal do Amazonas , Manaus , Amazonas , Brazil )
  • França, Fabiana  ( São Leopoldo Mandic Institute and Dental Research Center , Campinas , Brazil )
  • Turssi, Cecilia  ( São Leopoldo Mandic Institute and Dental Research Center , Campinas , SP , Brazil )
  • Basting, Roberta  ( São Leopoldo Mandic Institute and Dental Research Center , Campinas , Brazil )
    • Financial Interest Disclosure: NONE
    SESSION INFORMATION
    Poster Session
    Poster Presentations
    TABLES
    Mean values and standard deviations of bond strength (MPa) for each factor under study.
    Main factorP valueComparison between groups
    Indirect Material (regardless of dentin treatment or time)0.323Nanoceramic resin
    Mean: 14,80 *
    Standard deviation: 7.71    		Lithium disilicate
    Mean: 13,41 *
    Standard deviation: 7.90
    Dentin treatment (regardless of indirect material and time)0.274SB Universal
    Mean: 13.50 #
    Standard deviation: 8.08    		Etch + SB Universal
    Mean: 14.85 #
    Standard deviation: 7.45
    Time (regardless of indirect material and dentin treatment)0.01648 hours
    Mean: 15,68 A
    Standard deviation: 8.39    		12 months
    Mean: 12,56 B
    Standard deviation: 6.89
    Legend: SB = Scotch Bond. Means followed by * indicate absence of difference between indirect materials in bond strength. Averages followed by # indicate absence of difference between dentin treatments for bond strength. Means followed by distinct capital letters indicate significant difference between times in bond strength.
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