Study of the Physicochemical and Mechanical Properties of New Dental Sealant Formulations
Keywords:
dental sealant, absorption, solubility, compression.Abstract
Introduction: Dental sealants are used as a protective barrier on the occlusal surfaces of posterior teeth for the prevention of dental caries.
Aim: To evaluate the physicochemical and mechanical properties of new formulations of self-cured dental sealants.
Methods: Four experimental self-cured dental sealant formulations were prepared using two monomeric matrices composed of Bis-GMA, 2, 2[p - (2-hydroxy 3- methacryloyloxypropoxy) phenyl] propane/ tetraethylene glycol dimethacrylate (BT) and Bis-GMA/ tetraethylene glycol dimethacrylate / ã-methacryloyloxypropyltrimethoxysilane (BTM) and with the addition of 1 % aerosyl OX-50 (BTR1 and BTMR1). The initiator system was the 1 % benzoyl peroxide/N,N-dimethyl-p-toluidine pair. The morphology of the filler was observed by scanning electron microscopy and the new monomeric matrix was characterized by infrared spectroscopy. The experimental sealants were characterized through the determination of working and setting times, water absorption and solubility, and compressive strength.
Results: Aerosil OX-50 is formed by spherical nanoparticles of silicon dioxide and form agglomerates between 50-100 nm. The infrared spectrum of the matrix showed the main absorption bands of the monomers, which correspond to the vibrations of the O-H, C=O and C=C bonds. The experimental sealants showed adequate working and setting times for these materials. Sealants with 1 wt.% filler showed absorption and water solubility within the limits of ISO 4049:2019 and compressive strength between 64 and 91 MPa.
Conclusions: The experimental sealant containing the coupling agent in the matrix and 1 % aerosil OX-50 presented the best values of the properties studied, which evidences the positive influence of the addition of silane and filler in the matrix.
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References
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