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Effect of partially demineralized dentin beneath the hybrid layer on dentin-adhesive interface micromechanics
Rodolfo Bruniera Anchieta1, Lucas Silveira Machado2, Renato Herman Sundfeld3
1Department of Dental Materials and Prosthodontics, Sao Paulo State University, Araçatuba Dental School, Araçatuba, SP, Brazil; New York University, College of Dentistry, Epidemiology and Health Promotion, New York, NY, USA.
Objective:
To investigate the presence of non-infiltrated, partially demineralized dentin (PDD) beneath the hybrid layer for self-etch adhesive systems, and its effect on micromechanical behavior of dentin-adhesive interfaces (DAIs). This in-vitro laboratory and computer simulation study hypothesized that the presence of non-infiltrated PDD beneath the hybrid layer does not influence the mechanical behavior of the DAI of self-etch adhesive systems.
Methods:
Fifteen sound third molars were restored with composite resin using three adhesive systems: Scotchbond Multipurpose (SBMP), Clearfil SE Bond (CSEB) and Adper Promp L-Pop (APLP). The thickness and length of all DAIs were assessed using scanning electron microscopy, and used to generate three-dimensional finite element models. Elastic moduli of the hybrid layer, adhesive layer, intertubular dentin, peritubular dentin and resin tags were acquired using a nano-indenter. Finite element software was used to determine the maximum principal stress. Mixed models analysis of variance was used to verify statistical differences (P<0.05).
Results:
Elastic moduli and morphology were found to differ between the adhesive systems, as well as the presence and extension of PDD.
Significance:
Both self-etch adhesive systems (APLP and CSEB) had PDD. The DAI stress levels were higher for the one-step self-etch adhesive system (APLP) compared with the etch-and-rinse adhesive system (SBMP) and the self-etch primer system (CSEB).
