A novel dentin bonding system containing poly(methacrylic acid) grafted nanoclay: synthesis, characterization and properties.
OBJECTIVE
Developing a novel dentin bonding system containing poly(methacrylic acid)-grafted-nanoclay (PMAA-g-nanoclay) as reinforcing filler, with high stability of nanoparticle dispersion and improved bond strength and mechanical properties were the main objectives of this study.


METHODS
Poly(methacrylic acid) (PMAA) was grafted onto the pristine sodium montmorrillonite (Na-MMT) nanoclay surface and characterized using FTIR, TGA, and X-ray diffraction (XRD). The PMAA-g-nanoclay was incorporated into an experimental dentin bonding system as filler in different concentrations and stability of nanoclay dispersion in the dilute adhesive, morphology of nanoclay layers in the photocured adhesive matrix, shear bond strength to caries-free extracted human premolar teeth, and mode of failure were studied. The mechanical properties including diametral tensile strength (DTS), flexural strength (FS), and flexural modulus (FM) were also investigated. The measured FM was also compared to theoretical prediction models.


RESULTS
The grafting of PMAA onto the nanoclay surface was confirmed and the results revealed a partially exfoliated structure for PMAA-g-nanoclay. The dispersion stability of the modified nanoparticles in the dilute adhesive increased more than 45 times in comparison with the pristine nanoclay. The incorporation of 0.5wt.% PMAA-g-nanoclay to the adhesive resulted in a significant increase in microshear bond strength, DTS, and FS. Higher PMAA-g-nanoclay contents resulted in increased flexural modulus. The experimental flexural modulus was in good agreement with the Halpin-Tsai theoretical model.


CONCLUSIONS
Incorporation of PMAA-g-nanoclay particles as novel functional fillers into dental adhesive could result in the development of bonding systems with improved physical, mechanical, and adhesion properties.
Iran Polymer and Petrochemical Institute (IPPI), Tehran, Iran.
Laleh
L
Solhi
Mohammad
M
Atai
Azizollah
A
Nodehi
Mohammad
M
Imani
D000704:Analysis of Variance; D001546:Bentonite / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000138:chemical synthesis* / Q000737:chemistry; D055119:Elastic Modulus; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D033081:Shear Strength; D013718:Tensile Strength; D014961:X-Ray Diffraction
D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; D001546:Bentonite